Essential Clock Movement Servicing Steps

Why does a mechanical clock movement require servicing? The answer is quite straightforward. Maintaining your clock’s movement is essential to ensure it continues to function properly and extends its lifespan.

Regular servicing reduces wear and tear, ultimately preserving the clock’s functionality. Ideally, most clocks should undergo servicing every three to five years to maximize longevity.

This article outlines the seven steps I typically follow when servicing an antique or vintage clock movement, using a common American, pendulum-driven movement as an example, Seth Thomas’s Type 86 8-day time and strike movement.

Step 1 – Initial Assessment: Upon receiving a clock, my first task is to determine if it runs. I assess whether it runs and strikes correctly and completes its full 8-day cycle. If it operates for fewer than 8 days, there may be an underlying power problem, which could stem from various factors like weakened mainsprings, worn bushing holes, bent arbours, and so on but more often than not a good cleaning will improve its run time even if there is some wear in the movement.

_{The movement is mounted to the front of the clock}

Step 2 – Addressing non-running clocks: When the clock does not run, I conduct an examination to identify potential issues such as missing or broken components, bent wheel assemblies, and arbours, damaged or worn gear teeth, worn pinions, snapped mainsprings, and broken or broken clicks along with any missing parts like suspension springs or pendulum bobs.

Nevertheless, when all components are intact and the mainsprings appear to be in good condition, I take measures to ensure the clock is properly adjusted for an even beat.

I’ve observed that on many occasions, the mainsprings are wound tightly, and relieving this tension tends to address the problem (albeit temporarily), allowing the clock to operate relatively smoothly. However, if it stops running soon after starting, I note the problem areas and set it aside for servicing.

Step 3 – Disassembly and assessment: After removing the hands, dial face, and taking the movement out of the case (4 screws hold the type 86 in place), I conduct a thorough visual inspection. This step involves checking for damage, dirt, and excess oil, and determining the extent of cleaning required.

I use retaining clamps to safely secure the mainsprings’ power and then proceed with disassembling the movement. Disassembly includes removing outboard parts such as the crutch and suspension rod, releasing the four or five bolts holding the plates in place, and proceeding to remove the wheels and levers.

I assess wear in various areas, including pinions, pivot holes, arbor conditions, and connections between plates and pillars. I also look for tool marks and indications of previous servicing.

Step 4 – Cleaning the parts: Cleaning the clock movement parts is crucial, and I prefer using an ultrasonic cleaner. I use a mild alkaline, biodegradable degreaser concentrate for cleaning. I organize the parts in compartments for easy identification, with strike parts separated from time-side parts.

For open-loop mainsprings such as the type 86, I detach them from the main wheel before cleaning. To guarantee that the mainwheels and springs are reinstalled in their original spots, I mark them with either “T” or “S” for clear identification.

Drying the parts promptly is vital to prevent rust formation. I use shop towels and a portable hair dryer to ensure all areas are dry. Lantern pinions tend to be especially difficult to dry and a hair dryer is an ideal tool to remove excess water.

After cleaning, I inspect the cleaning solution and, if suitable, reuse it.

Step 5 – Polishing pivots: The next step involves polishing the pivots. If the pivots are in good condition, a few passes with an emery board are sufficient. A small metal lathe is ideal but a portable drill will do.

For pitted pivots, more aggressive cleaning and polishing may be necessary, and in extreme cases, pivot replacement may be required. Cleaning and wiping the pivots with a soft cloth is essential, followed by bushing if needed.

Step 6 – Bushing, broaching, and pegging pivot holes: I determine which pivot holes need bushing by assessing lateral pivot movement and marking each one (with a black marker) to be bushed.

I use a Bergeon bushing machine known for its precise work. After making the bush hole, I clean it from chips and burrs, followed by broaching if necessary. In the process, both cutting and smoothing broaches are used to ensure an optimum fit.

Drilling a hole with Bergeon bushing machine — _{A hole is enlarged with a} _{cutter to accommodate a new bushing}

All pivot holes are pegged with toothpicks until no residue remains.

Step 7 – Making necessary repairs: Other potential repairs include re-pivoting, straightening or replacing wheel teeth, sourcing parts, making new parts, and addressing issues with worn lantern pinions and escapement components.

Step 8 – Reassembly, testing, and adjustment: Finally, I reassemble the clock movement, carefully securing the gears and levers in place. I use a pivot locator to move the pivots to their correct location. Once reassembled, the movement goes through a testing process and adjustment on a test stand, ensuring it is in beat and properly regulated. This testing phase can take up to a month before returning the movement to its case.

_{A movement on a test stand. Attached is a microphone for a beat amplifier}

In conclusion, servicing antique or vintage clocks significantly extends their lifespan. These seven steps provide a general guideline for clock movement servicing, though some steps may require further explanation, and individual procedures may vary among clockmakers.

September 29, 2023

Lessons learned from 10 years of clock collecting, repair, and restoration

Ten years have flown by very quickly. Just the other day I was cleaning a clock I serviced over 5 1/2 years ago and it struck me that I have been at this for over 10 years and loving it.

Three years into the hobby I decided to begin blogging and have been at it for close to 7 years. I love blogging and it helps me gauge my progress as I explore new avenues of clock collecting, repair, and restoration and it allows me to marry my photography hobby with writing.

It has been quite the journey, I have learned a lot in that time and have some thoughts I would like to share.

Managing my collection makes me a better collector

In the early days, I would collect just about anything I could get my hands on, the cheapest clocks imaginable, some for as little as $5, generally for practice working on cases and movements but the number of clocks began to build up at a fast rate.

80 clocks is a comfortable number for me. I have adopted a “one comes in, one goes out” rule to control the size of my collection.

I learned to become more discriminatory and concentrate on particular types of clocks rather than any clock at all, selling off or gifting those that did not fit my new criteria. Spring and weight driven wall clocks and American and Canadian shelf clocks from the 1860s and 1870s are my principle focus at this time.

Take your time, there is no rush

Rewards come in small increments. My last major project was an antique 1840s circa banjo clock. Acquired in the spring of 2021 it took me almost a year to complete the project, working on it in stages.

Whether it is restoration or repair, I take my time investigating new (to me) techniques or wait for a tool that I feel would make the job simpler. For example, the bezel repair on the banjo clock above was made much easier by the purchase of a band clamp.

Buy only the tools you require and more if and when you need them

Tools can be expensive. As in any hobby requiring the assembly and disassembly of mechanical devices, I relied on the tools I had on hand to get started. Once committed to the hobby my next decision was to determine how I wanted to grow it.

Equipment such as a pivot cutter. lathe, a decent ultrasonic cleaner can amount to hundreds if not thousands of dollars.

It took me four years to justify purchasing a pivot cutter, another year or two to buy a lathe and ultrasonic cleaner and over time I have managed to acquire most of the hand tools that I require. Spreading out the costs over time has also made it financially feasible.

There is always the option of buying used but I live in a distant part of Canada with a low population and there are just not as many people engaged in clock collecting and repair as would be elsewhere.

Antique and vintage clocks are cheap and there are plenty of them

Some clocks are well over 100 years old but are worth almost nothing. A glut of antique clocks offered on the internet have lowered their value. Ogee clocks that were once two and three hundred dollars years are worth a quarter of that today.

I have bought $40 clocks that are now worth, well…$40. There are a rarefied few in the world that are worth a fortune but I don’t have any of those in my collection.

Ansonia Drop Extra wall clock — _{A $5 barn find}

Some clocks have crept up in price over the years but I do not have anything that I would call very valuable. Others, such as my collection of eight Arthur Pequegnats mantel and wall clocks are highly collectible in Canada.

At any given time there are literally hundreds of “antique” clocks offered on online for-sale sites. A majority of these clocks are trash and many are not antique though they are offered as such. Sellers often advertise clocks that are beyond repair and unfortunately clocks made in Asia are cheap, dangerous to work on, and were never meant to be repaired.

Choose repair advice wisely – not all advice is good advice

There are experts on clock repair out there, you just have to find them. It is too easy to get swept up by people who do not know what they are talking about and there are a number of well-meaning folk on YouTube that offer questionable clock repair advice. I follow a couple of well-respected YouTube repairers and have seen enough of their videos to convince me that they know what they are doing.

As I am a member of the NAWCC (National Association of Watch and Clock Collectors) and a member of the Ottawa Valley Watch and Clock Collectors Club, chapter 111 of the NAWCC. As such I have access to a wealth of information including online library resources and articles. NAWCC has an online forum presence that anyone can join for free. There are a number of well-respected people on the forum who contribute regularly. They have years of experience and offer excellent advice.

There are few clock Facebook groups but the advice is all over the map. Tinkerers and experts can be found but the expert soon loses patience and many are chased away by the know-it-all.

Collect clocks for profit? The margins are too small. However, I do sell the odd clock to offset equipment purchases. For me, I love the nostalgia, the design, and the fascination of a machine that may be over 150 years old that works perfectly today. Value is not important to me. Hobbies for profit? For some but not for me.

Be prepared to walk away

I have walked away from more than a few clocks over the past 10 years. Sometimes you have to let it go. Whether it is the price of a clock on an auction site that has risen beyond what I am prepared to pay or a clock offered as rare when it is, in fact, quite common.

Rare Ingraham Huron found on a local online for-sale site — _{E Ingraham Huron shelf clock made between 1878-1880}

Some would have been perfect to have in my collection but they were priced just a little too high for my tastes. Others had too many things wrong and had suspicious repairs or parts missing that would have been impossible to source.

Just when I say, darn I missed that one, a better clock comes along.

Meeting like-minded people opens up a new world

As clock collectors and repairers we are a strange lot. Some of my clock colleagues are quite eccentric. Most are introverts and although they keep to themselves have no trouble sharing with like-minded people. One of the most fascinating things about this hobby is the people and their passion for mechanical clocks.

Final thoughts

These are some of my reflections over the past 10 years. I have learned a lot, met many fascinating people, acquired some very interesting clocks and look forward to more adventurers in the world of clock collecting and repair.

April 19, 2022

Chauncey Jerome 30-hour movement – two unusual issues during servicing

I was not really looking for an ogee clock to add to my collection. But there it was sitting in a lonely corner of an antique shop calling me, “buy me”; and I did.

It is probably the oldest one in my collection of 4 other ogee clocks. It was made in or about 1845. Now, being old does not necessarily make it valuable. In fact, millions of these clocks were produced and many found their way to online auction sites in recent years contributing to a huge drop in value. You can find them online for a little more than I paid for mine but they are pretty cheap nonetheless. This one was $54.

The case label located on the backboard inside the clock case was printed by John Benham in 1845. Comparing the movement in this case with one found on a popular Jerome database site tells me that it is a type 1.311 Jerome movement. Jerome movements were typically marked though some, like this one, were unmarked which is not unusual.

So, the case and the movement are near enough in time to tell me that the movement is very likely original to the case. That is always a good sign as many ogee cases had worn movements replaced over the years. In some cases, there was little intertest in matching the maker of the case to the movement especially if a customer’s only wish is to have a working clock and since the movements were interchangeable it made it that much easier. Many of these clocks are over 180 years old and one can expect some subtle and not-so-subtle changes over the years.

While very attractive and running well this clock (below), a “marriage”, is an EN Welch case with a Waterbury movement. When considering the purchase of an ogee clock, if it is important to you, check that the movement and case are from the same maker though that is not an absolute guarantee they started their lives together.

What is original and what has been replaced?

Typically parts that have been lost/damaged or replaced over the years include the verge, suspension spring/leader, the pendulum bob, the weights, the hands, and case parts like pulley dust caps. In some cases, the lower tablets have been removed altogether because of breakage or severe paint loss, replaced by a clear glass panel, a mirror, a photograph, or a picture (often from a discarded calendar).

The leader and suspension spring are missing. The verge appears to be a replacement, the weights look original as do the hands and pendulum bob. There is a missing top movement block that secures the movement to the backboard and that is about it.

I am reserving judgment on the frosted glass tablet; it may or may not be original. It would be pretty exciting if it were a Fenn design but I doubt it. William Fenn was one of the more prolific tablet-makers of the mid-19th century. The dabs of red paint are certainly added later.

The clock dial, likely original, is signed C. Jerome below the twelve o’clock.

Assessment of the movement

This is a typical 30-hour or one-day time and strike movement.

I found some wear and I was expecting some past repairs. There is a repair date of 1863 on the inside of the access door but I can’t make out what was done at that time.

There are two bushings installed on the front plate, the second wheel, and the hour gear. On the back, there are four replacement bushings, evidence that it has had acceptable servicing. One seldom finds replacement bushings on an ogee clock. Most movements I have come across have punch marks around the bushing holes, a common practice by past clock repairers to close elongated holes.

Three of the replacement bushings will have to be redone and new bushings are required for the back-plate time side main wheel and the strike side back-plate main wheel for a total of five.

The pressure washer for the time side main wheel is completely worn out. Had I not separated the wheel and ratchet for cleaning I would not have discovered the problem but it tells me that it could fail at some future point.

_{To the right is the pressure washer with centre worn through}

I have a donor New Haven 30-hour movement that will provide the replacement washer.

The lantern pinions have some wear but are quite acceptable. One trundle is loose on the escape wheel. Rather than take it apart and re-seat the troublesome trundle, a dab of Loctite Red should fix it in place.

These are two unusual issues but not insurmountable.

_{A lantern pinion with a loose trundle}

Because the movement was so oily and dirty I pre-cleaned the parts prior to putting them in my ultrasonic. This helps extend the life of the solution. I used a medium bristle nylon brush to clean the stubborn areas.

After cleaning and drying the parts, the pivots are polished and I was pleased to find almost no wear on any of them.

Next is the bushing work. My only concern was pushing out what remained of the bushing material in the replacement bushings after drilling. I went slowly and did not apply pressure on the cutter, letting it do its work. As I suspected the Bergeon bushings are marginally smaller but each bushing fit snugly. Although I planned on five bushings, I installed six, adding a bushing for the second wheel on the time side front plate which was a little more worn than I thought. I left the escape wheel as-is, the wear is acceptable.

Next is restringing the weights, re-assembly, and testing. All went as expected.

I have worked on a few of these movements over the years but unique issues always seem to come up. Nonetheless, they are fun to work on.

Following the movement servicing, I will move on to refreshing the case.

December 7, 2021

Forestville mantel clock servicing – not fun when things go wrong! Part II

Back in October (2020), I wrote about the challenges of working on this mantel clock by Forestville.

Recap so far

It is a nondescript Art Deco-style German mantel clock made in the 1960s sold under the Forestville name, a Toronto-based company that assembled clocks up to the 1970s.

The rack and snail movement is relatively simple to work on with all the adjustments, save for the stop wheel, on the outside of the plates. The mainspring barrels can be removed separately for servicing, typical of movements of the period.

The hairspring escapement is something I did not attempt to clean. They can be finicky to work on and if the movement has been running beforehand, like this one, there is no pressing need to mess with it. Three screws detach it from the movement.

The bane of clockmakers – the broken pivot

When working with German and French movements particularly one must always be very careful of the small pivots. Normally when I work on this type of clock I am very aware of how easy it is to bend or break the tiny pivots and this clock was no exception. After taking apart the movement and reinstalling the gears to determine bushing wear I noticed the front plate center wheel pivot had come off.

Thinking I was careful guiding each pivot in place with a pivot locator I either applied too much pressure closing the plates or it was hanging on like a tread. Regardless, it broke. Compared to a pair of tweezers it is very small.

Broken pivot compared to a pair of tweezers

My experience with pivot repair is limited. I don’t come across broken pivots very often. Compared to an American clock that has much larger pivots these are tiny, perhaps 0.5mm or so. Although I have bushings that fit I do not have pivot wire that size and had to make do with a piece from my assortment of 0.85mm to 1.10mm wire. Not pretty but functional.

First, using a centring bit followed by a high-speed bit on my Taig metal lathe, I drilled 5mm into the shaft, enough to securely anchor the pivot wire. Once the wire was inserted, I applied high-strength Permatex Threadlocker Red to secure the wire in place.

A centring bit is essential when drilling a starting hole in an arbour.

After the 24 hour curing period for the adhesive, I installed a bushing in the front plate and put the gears back together to check the action of the new pivot. It is working okay. I will reserve judgment on the repair until the other bushings are installed.

There is more wear on the time side that at least 3 new bushings are required, two on the front plate and one on the back.

Out of an abundance of caution, I installed an additional 2 bushings. In total are T2, T3, T4, rear plate, and T4, T5, front plate. All bushings are on the time side which tells me that the strike side did not see much action, typical for many mechanical clocks since some folks find the noise of the strike bothersome.

2 new bushings on the front plate, new pivot in the centre of the photo (untrimmed)

3 new bushings on the rear plate using a Bergeon Bushing Machine

Servicing the mainspring barrels was more frustrating than I anticipated. Both mainsprings refused to catch on their hooks when I attempted to install them back into their barrels. The mainspring opening must be precisely on center to catch. Lesson learned; after a few tries, I successfully got them hooked back into the barrels.

Re-assembly

The new pivot was trimmed to fit and given a final polish prior to installation. Now to put it all together and see if the work has paid off.

I was especially careful putting everything back together and very mindful of how easy it is to snap off one of the delicate pivots. All went well. On the test stand, I ran the strike side through its sequence; it is going into warning and striking on the half-hour as it should. Now for the time side.

Repairing a broken pivot. Left on the lathe overnight to cure the adhesive and keep the pivot straight.

At first, the escape wheel would stop after a minute or so but after oiling the pivots including those on the hairspring (minus the jewelled ones, of course) it runs well.

Testing the Forestville movement on a non-standard stand

I will continue with the test of the movement but so far, after two 8-day running cycles, things are looking very good. The next step is to re-install the strike hammers and other moving parts and return the movement to its case.

November 19, 2020

Gilbert tambour clock with Normandy Chime – movement servicing

This Gilbert tambour style mantel clock is model 2038 with a bim-bam strike or what Gilbert called a Normandy chime. The model number along with the words “Normandy Chime” are stamped on the bottom of the case. Gilbert called this the “Normandy Chime” as it was reminiscent of the old bells of Normandy (Corneville) in France. In terms of nomenclature within clock circles, calling it a “Chime” certainly adds to the confusion as this would be considered a striking clock rather than a chiming one.

Whoever did the past bushing work chose to avoid the motion works area, and for good reason

The Movement

And now to service the movement.

Dis-assembly of the movement is done in the conventional manner with the exception of two items. Both the striking disk (upper arrow) which runs off the cam wheel and the passing strike L bracket (lower arrow) which runs off the centre cannon are friction fit and must be pulled off beforehand to work on the movement. I don’t have a puller but two small screwdrivers positioned across from each other will lift the parts off with minimal effort. Do not polish the ends of these two rear pivots.

Arrows showing striking disk and passing strike L bracket

A prior examination of the movement revealed that it is generally good shape. Overall, the lantern pinions are in good condition with minimal wear. There has been extensive bushing work completed in the past. I see six replacement bushings on the back plate and seven on the front for a total of thirteen which suggests that there was a lot of wear. They are all in very good condition which tells me that the work was done fairly recently.

It also tells me that whoever did the past bushing work chose to avoid the motion works area and for two reasons. It is a tough one to fix because there is so little brass to work with and there is not a lot of torque on this wheel so it can be left as-is.

Although the following photo does not show it well, there is a lot of play in the bushing hole. This is the only one that is addressed in this servicing because I wanted to ensure good meshing of the motion works gears.

To address the motion works bushing I sought advice from my colleagues at the NAWCC forum site with comments ranging from doing nothing to immediate replacement. The best advice came from a member who suggested I install a smaller diameter bushing and broach out the hole to fit the pivot and that is exactly what I did. A #46 Bergeon bushing was chosen with a diameter of 3mm and an inside diameter of 1.30mm. The pivot is 1.48mm and the result is a side wall that is about 0.80mm. This should allow the gear to mesh nicely and since there is not a lot of torque on this gear the fix should last a long time.

Re-assembling was straightforward. There are no helper springs on this movement so there was no tension pushing on the levers. The only adjustment I had to make was to pull the movement slightly apart to correctly align the stop pin to the stop lever so that the movement strikes as it should.

Arrow showing stop pin (my healing thumbnail from a mainspring that let go)

Since the movement has a Normandy chime the striking hammers are located outside and to the bottom of the movement.

Striking hammer assembly for Normandy Chime

The final process in re-assembly is to attach the hammer mechanism. But before doing so two parts are re-attached, the strike wheel and the L bracket which are pushed back into place. Once in place they can be moved slightly to sync the hourly and half hour strike.

Some folks give Gilbert movements a bad rap but they are not much different than a Sessions, or similar inexpensive movement of that period and the fact that this one is still functioning after over 90 years has to say something for its engineering.

March 28, 2019

What does bushing a clock mean?

American Sessions time and strike clock showing a gear pivot and the build-up of dirt in the pivot hole

Is your mechanical clock not running as well as it should? Does it stop intermittently or not run at all? There may be a number of issues with the movement and among them pivot wear.

Pivots are the ends of the axles (the horological term is “arbours”) that spin in small holes drilled in the clock plates as the clock runs. They are reduced or turned down end of an arbour. These, along with the holes themselves, can become worn. The pivot hole must be perfectly round and the pivots must have a mirror-like polished surface in order to minimize friction within the train of gears. The two surfaces must be protected and the barrier between the pivot and the pivot hole is clock oil.

A worn pivot or worn pivot hole causes the gear to slowly move away from the pinion and it will eventually stop when the gears no longer mesh properly. A clock that is in need of bushings runs erratically or stops altogether.

If a clock movement is not serviced (cleaned and oiled) routinely there will be wear in the plates of the movement where the pivots come through. If new oil is applied over the old il it will free up abrasive dirt and keep grinding away at the steel and the brass bushing hole. Worn pivots are typically found in clocks that have been oiled over and over again and not properly cleaned. The term “properly cleaned” implies disassembly of the movement, cleaning the parts, addressing wear issues, reassembly, and testing.

Occasionally you will see punch marks made to close the pivot hole. Though not an accepted practice today this was a common method of repair employed by past clock repairers

Pivots must be cleaned and polished periodically to ensure they can turn freely within the hole in the clock movement plate. A worn pivot hole is easy to observe as they are oval-shaped instead of round as you can see in the next photo.

Close-up of bushing wear — Close-up of oval-shaped bushing wear. The circle shows what the hole should look like

The process of bushing consists of replacing the worn brass around the pivot so that the hole is round again. A new hole is drilled into the plate. A new, properly sized, the bushing is punched or pushed into the plate using a bushing machine such as a Bergeon Bushing Machine.

Some clock-makers prefer to hand bush using reamers and smoothing broaches and the results are entirely acceptable but a machine simplifies the task.

Badly worn pivots which are made of steel must be replaced with new pivot. This is called re-pivoting in clock circles. A watch or clock lathe is used for re-pivoting which involves drilling into the end of the wheel arbour with a high-speed bit and installing a new pivot made from pivot wire.

Punching the bushing home using a Bergeon Bushing machine

Using a micrometer to check pivot diameter

Minor wear is tolerable and expected over the life of a clock and can be addressed by careful filing, polishing, and burnishing.

X marks pivot holes that need to be bushed — X marks pivot holes that must be bushed

Looks like a large pivot hole but actally punched close to the hole — Punch marks near the pivot hole. This was a common practice of past clock repairers

Bushing is an integral part of movement servicing. Some clocks that have been well-cared for may have minimal wear and may not require new bushings while others, through neglect or improper servicing, may require many bushings.

Bushing a clock is one of the most fundamental tasks of the clock-maker. Pivot and bushing work performed correctly will extend the life of a clock movement while ensuring that a clock runs reliably for years.

July 20, 2018

So you want to fix a mechanical clock – Part II – advanced tools

tools are essential for clock repair because they enable precision and accuracy, which are critical when working with delicate mechanisms and intricate components. Let’s identify the key reasons.

Antique and vintage clocks can lose significant value if repaired improperly. Using the right tools minimizes the risk of damage, preserving their historical and monetary worth. The right allows you to handle small parts without causing damage. Specialized tools ensure components are handled carefully and correctly.

Proper tools make the repair process faster and more straightforward. Having the right tools helps build confidence and competence. They allow you to focus on understanding clock mechanisms without being hindered by improper equipment.

This article will describe some of the more advanced tools required to tackle the repair and/or cleaning of mechanical clocks.

Based on years of clock repair experience, I recommend the following tools for those ready to advance their skills in clock restoration and repair. Most specialty items will need to be ordered from clock supply companies such as Timesavers (USA), Perrin (Canada), or Meadows and Passmore (UK). Other items such as an ultrasonic cleaner can be ordered through online merchants.

Part I of this two-part series describes the basic tools for those just starting out. The tools/equipment described here are for the more advanced hobbyist/amateur horologist.

A Suggested List of Items

Ultrasonic Cleaner: This Harbor Freight special will do for now but it is so low-powered that a newer, more powerful machine is on the horizon. It does not perform as well as better quality machines and it has a limited load capacity. An eight-minute limit for each cycle means that several cycles are required to properly clean clock parts. It is a start.

Spring winder: An essential tool. Disassembling clock movement also includes servicing the mainsprings. Mainsprings must be inspected for breaks, cracks and splits, cleaned of old oil and rust (as long as there is not too much rust) and lubricated prior to re-installing them into the movement. Too much rust and they should be discarded. I generally do not replace springs in a movement unless they are quite set, or have breaks or cracks. I have found that the steel in the original movement is better quality than can be found today. Mounting the spring winder on a piece of hardwood provides a stable tool and allows it to be clamped to a work-desk.

Although there are other types of spring winders, the Olie Baker winder is one of the better choices in my view. It is well made and should last for years. If you can find a used one you will save a little.

Joe Collins has plans for a homemade spring winder that you can find on the National Association of Watch and Clock Collectors site.

_{Mainspring servicing; taking the clamp off to inspect and service the mainspring}

_{Mainspring barrels require collars supplied with the Olie Baker spring winder}

Bergeon 6200 Bushing Machine: Some bush by hand and they are to be applauded for their patience and skill. I chose a bushing machine for the delicate work of installing bushings. This is the Bergeon 6200 which is made in Switzerland. It is exceptionally well made and relatively simple to use.

The machine can be bought separately or with a set of cutters and other hardware (above). The cutters can last 15 years or more. Of course, you must also have an assortment of correctly sized brass bushings that are purchased separately from any clock supply house.

To operate, a correct size cutter is placed in the bottom end of the steel shaft, holes are cut after which the new bushings are punched in place with a hammer head fitted to the shaft.

Six bushings on back plate — _{Six new bushings on the back plate of a mantel clock}

Lathe: Good quality mini lathe are available from Sherline, Taig and others. A cost effective option is the Taig Miniature Lathe for metal. The Taig lathe was originally designed for precision machining of watch and clock parts; ideal for clock repair applications. The small office space in my home means that its compactness, portability and relative simplicity are attractive features.

Reference/Reading material: I recommend the Steven Conover series of repair manuals. The manuals are well-written, and detailed and are great resources for the beginner or the advanced amateur.

Steven G. Conover; Clock Repair Basics
Steven G. Conover; Striking Clock Repair Guide
Steven G. Conover; Chime Clock Repair

The acquisition of clock supplies and equipment has been a personal journey for me. I started with a few basic tools for disassembling movements, gradually learning what additional tools were necessary and steadily expanding my collection over time.

Several years ago, my first major purchase was the Olie Baker spring winder. A few months later, I added a Bergeon bushing machine, complete with cutters and a supply of bushings. Most recently, I acquired a Taig mini lathe with accessories. This mini lathe will enable me to advance my clock repair skills by allowing me to polish and burnish pivots properly, replace worn or damaged pivots, and perform other specialized repairs. As new challenges arise, I plan to seek out additional specialized tools and equipment to further enhance my capabilities.

And finally

Set a specific goal, research your requirements, and build your collection of tools and equipment gradually while sticking to a reasonable budget. Clock repair can be more affordable than you might expect, especially when costs are spread out over time and some tools can be sourced from the used market.

I hope you found this helpful! If there’s a tool or piece of equipment you consider absolutely indispensable, I’d love to hear about it.

November 18, 2017

Servicing a Well Worn New Haven Schoolhouse Clock

Side view of movement indicating solder points

The clock is a “Canadian made” New Haven Octagonal short drop wall clock. It was assembled at The New Haven Clock Co. of Canada plant established at Brantford, Ontario (Canada) in 1906.

The New Haven Clock Company of Canada was a subsidiary of the New Haven Clock Company of America. Both mantel and wall clocks were made in the Brantford plant with Canadian wood cases, but the spring-driven pendulum movements were brought in from the U.S. The Canadian arm of the New Haven Clock Company closed in 1956. More information about The New Haven Clock Company can be found here. This clock was probably made in the 1940s.

The clock was removed from a schoolhouse in Saskatchewan, Alberta (Canada) in the 1960s. The previous owner said that he ran the clock for a couple of years, got tired of it and put it in storage. I hung it up on my kitchen wall for a couple of months and while it ran immediately and kept good time I considered putting off servicing with other projects on the go. However, if I ran it long enough without proper attention any wear would be exacerbated. Now is the time to service this clock.

Day One

The movement was mounted with what looked like the 4 original screws. I wondered if this movement had ever been serviced. Clues began to reveal themselves as I took the movement out for a closer inspection.

OLYMPUS DIGITAL CAMERA — New Haven movement #304

The centre cannon arbour was very loose which is not uncommon. A bushing might be required. The pivots were in good shape and had minimal wear but most bushing holes on both the time and the strike side, front and back plates were so enlarged that there was considerable lateral movement of the wheels in both trains but not enough to stop the clock. Not the worst I have seen but clearly a clock that is in dire need of servicing. The clock ran for many years and appeared to have received not much more than basic servicing during that time.

Day Two

The movement was very dirty. The cleaning solution in the ultrasonic cleaner was dark brown in colour and large pieces of crud floated on top, a build up of dried oil and dust over the years.

An obvious example of a previous repair was the drop lever that had been soldered in two places as you can see in the photo below.

Top view of movement indicating solder points

The lever looks strong and should hold for years to come.

Strike side maintenance lever — Strike side maintenance / drop lever

I took special care to resist bending any parts of the lever to adjust it for fear of breaking it. The helper wire/spring on the drop lever also seemed to have been replaced at some point because it looked crudely made, not something you would see in a factory installed movement. A piece of the helper wire broke off during dis-assembly which meant that I had to make a new wire/spring.

I polished the pivots and then proceeded with the bushing work prior to cleaning the movement.

15 bushings were installed, 7 on the front plate and 8 on the rear plate. The centre cannon arbour required one bushing, a much larger one, on the rear plate.

To completely eliminate any issues with the time side I took all the strike train wheels out

Movement on test stand without strike side wheels

Day Three to day Five

All went well while test fitting the wheels on both trains; they moved as smoothly as they should. I re-assembled the movement and attempted to align the levers on the strike side as best as I could with little success. I ran the movement on the test stand even though the drop lever was not positioned correctly. Unfortunately, the clock stopped every few hours. My suspicion was an incorrectly aligned lever somehow stopping the strike side.

To completely eliminate any issues with the time side I took all the strike train wheels out and ran the time side for 3 trouble-free days eliminating any issues with the motion works.

I consulted Steven Conover’s excellent book on strike clock movements (Striking Clock Repair Guide) to work through a solution. He devotes one chapter to the New Haven movement and clear instructions for setting up the strike side.

Day 6

After studying Steven’s manual, I reinstalled the strike side and proceeded with the necessary adjustments as follows.

The positioning of the levers are critical.

There are 3 levers in this clock. Knowing how the levers function is key to getting this clock to run. The hammer strike lever (Lever number 1) performs a very simple task and installs on the bottom of the clock and is activated by the hammer lifting pins on the cam wheel. The drop and paddle lever (Lever number 2) does several jobs in unison. It pushes the unlocking lever or the lift lever (Lever number 3) down to release the warning pin to prepare the strike. The top arm of the lever number 2 rotates through the 2 – 180 degree slots of the cam while the bottom arm forms the paddle that enters the deep slots of the count wheel to indicate the strike on both the hour and half hour. The upper arm of this lever must be on the upper rear part of the slot on the cam to work correctly. I found this through trial and error. Needless to say, the positioning of the levers are critical. Once the levers were positioned correctly, the clock ran beautifully.

Post assembly testing

The clock went through it’s full 8-day cycle without any issues striking as it should. The movement was mounted back into it’s case, is being regulated and is now on display in our living room.

This very ordinary clock reflects its utilitarian role as a schoolhouse clock; it is not the best looking or the best sounding clock in the world but like a faithful servant it should run without issues for years to come.

April 28, 2017

Servicing a Sessions American No. 2 mantel clock Part IV

In this fourth and final entry of the series I will discuss bushing work, re-assembly and finally, testing and mounting the movement back into it’s case. Part I of this series can be found here, Part II here and Part III here,

Once the pivots are inspected, cleaned and polished it is now time to install any bushings required as result of careful inspection.

I acquired a Bergeon Bushing Machine in the spring of this year (2016). As I mentioned in Part III, some may prefer to bush by hand which I think is commendable but I have decided to go the bushing machine route. In the last few months I have been using and learning its many tools. It comes with a set of chucks and reamers some of which (right side rear) are a bit of a mystery to me. I cannot see using any of the large reamers any time soon though I assume that if I am working on tall-case clocks which have larger movements they would come in handy.

First is selecting the correct bushing using a micrometer to measure the diameter of the pivot. Then, I select the proper bushing from my Bergeon assortment kit.

The bushing I have selected for the escape wheel pivot (measured at 1.46 mm) has a depth of 2 mm, an outside diameter of 3.5 mm and a pivot hole of 1.5 mm. In the next photo I am positioning it on top of the 3.47 mm. hole that I have just just “drilled” using one of the reamers. The outside diameter of the bushing is slightly larger allowing for a tight friction fit.

Once I have selected the correct bushing I test it on the pivot for fit and then I position it over the pivot hole and use a small hammer with it’s nylon end to tap the top of the bushing machine centre shaft lightly until the bushing is properly seated and level with the plate ensuring that the oil sink faces the outside of the plate.

New bushing installed with oil sink on the outside of the plate

To check proper fitment of the motion works bushings/pivots, I assemble all the wheels on that side (both plates), check for a smooth action and determine if any additional reaming/smoothing is required. I do the same for the strike side.

Once all the bushing work is completed and I am satisfied that each bushing fits correctly and operates smoothly, I re-assemble the mainsprings, wheels and levers and then re-attach the back plate using the five plate screws. We each have our own method of re-attaching the back plate but I work from the bottom up, that is, from the mainsprings. Once I have the mainsprings in place I immediately install the bottom 2 plate screws (loosely) and then work from the motion works side to the strike side using a pivot locator tool, if necessary, to coax the pivots into their respective holes.

Trains and levers ready for the front plate

Positioning the various levers can be a bit frustrating because those that have helper springs seem to slip out of their pivot holes easily as you are putting the plates together. Perseverance is certainly the key.

The one difficulty I had was adjusting the synchronization of the count and drop levers, that is, getting the drop lever to sit in the cam while I adjusted the locking lever position. The clock must be completely assembled at this point and once together loosen or take off the nearest pillar nut and pry the plates apart to take out both the flywheel and the locking wheel. Once out, the locking wheel can be re-positioned by moving the pin on the wheel so it rests on the locking lever. Once this is completed, re-install the flywheel. This is basically a trial and error process and I never seem to get it right the first time.

My only error in the first go-around was not restraining the strike mainspring during this procedure. While spinning wildly the strike mainspring flattened the protrusions off the cam that allows the hammer strike. Momentary panic! Once bent back into shape everything was fine. Naturally, I secured the mainspring for my second successful attempt.

My reference for these adjustments is Steven Conover’s Striking Clock Repair Guide which is an invaluable guide to striking American clocks.

Once the parts are re-assembled it is on to the final testing phase which takes days (and weeks, perhaps) as the clock is being carefully regulated. The following video shows the movement on a test stand (in this case, Gene’s Test Movement Stand). The sound of the pallet on the escape wheel is very quiet; you are hearing other clocks in this room. The clock is in beat and in the video you can see the movement of the escape wheel from various perspectives.

Once testing and regulating is completed and I am satisfied the clock will run reliably for 8 days I return it to it’s case. There are only 4 mounting screws. You may have to re-position the coil gong by loosening the adjustment nut on bottom of case to get that satisfying strike sound.

This attractive little Sessions American No. 2 time and strike mantel clock has now been serviced. It required 5 bushings and should run reliably for the next 3-5 years.

October 1, 2016

Servicing a Sessions American No. 2 mantel clock Part III

The movement is disassembled and now it is time for further inspection, cleaning, servicing the mainsprings, pegging the pivot holes, polishing the pivots and installing bushings where needed. In this, Part III we will cover cleaning and mainspring servicing.

I have a small ultrasonic cleaner so I tend to clean parts in batches since this one does not have a large capacity. An ultrasonic cleaner is not an absolute must as you can easily clean by hand but having one certainly helps.

Old toothbrushes are great for getting into the crevices and I use one especially for the lantern pinions as a lot of dirt and old oil tend to accumulate in those particular areas.

indicating wjehere bushings will be installed — indicating where bushings will be installed

This photo shows a couple of bushings that I will install. I realize that some prefer to install bushings by hand and I applaud them as it does take considerable skill but I use a Bergeon Bushing Machine which I believe simplifies the task (for me, at least). More on bushing in the next part of this series.

An Olie Baker spring winder is an indispensable tool. You can easily make one of your own to save a little money if you are handy with building things. A spring winder permits you to inspect for cracks or breaks, clean and oil the springs before reinstalling them. The photo shows a C-clamp securing the mainspring prior to cleaning.

I have never lost an eye or a finger but I believe in safety first especially when working with mainsprings. Always wear leather gloves and eye protection. You never know when a 100 year old spring will break and fly across the room.

I discovered that one click had to be replaced as it was almost slipping off the ratchet. As some clock repair folks know, Sessions clocks have a reputation for bad clicks. I had a Sessions click in my supply box, fortunately. It is an easy job; just take the old one out with pliers, secure the new click and bang the rivet (supplied) into the existing hole with a ball peen hammer.

The springs have been cleaned and oiled with Keystone Mainspring Oil and are completely serviced including the installation of one new click. Now comes the bushing work, re-assembly and testing. Stay tuned to Part IV of this series.

September 28, 2016

Sessions Beveled Number 2 Re-assembly

This clock has been sitting on my workbench for a couple of months. It is an attractive little Sessions tambour style mantel clock, very popular in the 1930s. I spent a little time refurbishing the case, have had good success making it look presentable compared to when it first arrived. The case was marred and it looked like it had been kicking around in a basement or a busy street (LOL) for a number of years. After a thorough ultrasonic cleaning and polishing of the pivots it is time to re-assemble the movement.

It was very inexpensive clock and a great one to hone my skills in clock repair and case restoration. One of my tasks was to use it for bushing practice but my Bergeon bushing machine is back ordered and it does not look like it will arrive until April. I really do not want to learn how to hand bush, I will leave that to the traditionalists. The bushings are in good shape and I am confident it will run but eventually it will need bushing work.

The first challenge after dis-assembly was to clean the movement and the springs. When I first pulled it out of the case, the time spring had completely let go as a result of a click failure. You can see the retracted spring in the photo below. Click failures are a common problem with Sessions movements. In fact, I have another Sessions Westminster chime clock with the same issue.

I cleaned and lubricated both springs. Everything went well until I tried to hook one of the springs to the winding arbor. After many tries I managed to massage the spring around the arbor with needle-nosed pliers and it finally hooked. The other spring was fine. Let’s hope it stays put and lets hope my click repair is successful.

The next photo shows everything in place on the bottom plate. You will see some strange looking wires which appear to be added to the movement but they are actually helper wires installed at the time the clock was made, essential to allow retraction / movement of some of the levers.

Getting the top plate on can be frustrating without the proper tool. One such tool is a pivot locator. It is a hooked device about 8 inches long that allows one to position the pivots into the bushings with minimal fuss.

Here is the assembled movement with the springs clamped for safety. You will notice the top plate appears to be dirty. In fact, this is some kind of lacquer residue. I am not into aesthetics and have chosen not to buff out the plates. A repair shop might for appearance-sake. The important things is that the mechanism is clean, which, of course, it is.

As I have others things on the go I have not tested this movement yet though I checked the action of the time side and the count wheel and they seem to be moving without restriction.

The next phase is testing and if necessary, minor adjustments.

Clock Repair Tools

RS Brandon — Arthur Pequegnat Brandon time only wall clock

It is time to buy the tools I need for clock repair. I already have a number of basic tools to get me started; pliers, letdown chucks, screwdrivers, etc.

However, my first significant tool is an Ollie Baker Mainspring Winder which arrived from the USA today. It is pictured below. The Ollie Baker comes with an assortment of collars for every size of mainspring.

The spring winder will enable me to inspect, clean, and re-install barreled or open springs on all the clocks I will be servicing. My first impression is that it is a robust and well-machined tool that will give years of service. Indeed, one of the most important tools for clock repair enthusiasts is the spring-winder.

I also ordered bushing kit #5488 from Perrins today which will enable me to have the bushings I need in order to use the Bergeon Bushing Machine that I will purchase later on this year.

The Bergeon Bushing tool is “Swiss made” and exudes quality. In every clock, due to considerable wear, the plates have to be bushed from time to time. This tool allows the bushing of plates of various sizes. The kit includes driving punches, centering bit, stakes, and reamers. I can bush by hand which some folks do by using appropriate reamers and files but I know that a bushing machine is a must-have. The first photo shows a clock movement that I had professionally bushed. It required 5 bushings in all in addition to cleaning and oiling and it runs very well.

With these tools, I can progress more seriously into this most interesting hobby.

January 4, 2016

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Whoever did the past bushing work chose to avoid the motion works area, and for good reason

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Occasionally you will see punch marks made to close the pivot hole. Though not an accepted practice today this was a common method of repair employed by past clock repairers

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A Suggested List of Items

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