• Important Executive Director Announcement from the NAWCC

    The NAWCC Board of Directors is pleased to announce that Mr. Rory McEvoy has been named Executive Director of the NAWCC. Rory is an internationally renowned horological scholar and comes to the NAWCC with strong credentials that solidly align with our education, fundraising, and membership growth objectives. He has a postgraduate degree in the conservation and restoration of antique clocks from West Dean College, and throughout his career, he has had the opportunity to handle some of the world’s most important horological artifacts, including longitude timekeepers by Harrison, Kendall, and Mudge.

    Rory formerly worked as Curator of Horology at the Royal Observatory, Greenwich, where his role included day-to-day management of research and digitization projects, writing, public speaking, conservation, convening conferences, exhibition work, and development of acquisition/disposal and collection care policies. In addition, he has worked as a horological specialist at Bonhams in London, where he cataloged and handled many rare timepieces and built important relationships with collectors, buyers, and sellers. Most recently, Rory has used his talents to share his love of horology at the university level by teaching horological theory, history, and the practical repair and making of clocks and watches at Birmingham City University.

    Rory is a British citizen and currently resides in the UK. Pre-COVID-19, Rory and his wife, Kaai, visited HQ in Columbia, Pennsylvania, where they met with staff, spent time in the Museum and Library & Research Center, and toured the area. Rory and Kaai will be relocating to the area as soon as the immigration challenges and travel restrictions due to COVID-19 permit.

    Some of you may already be familiar with Rory as he is also a well-known author and lecturer. His recent publications include the book Harrison Decoded: Towards a Perfect Pendulum Clock, which he edited with Jonathan Betts, and the article “George Graham and the Orrery” in the journal Nuncius.

    Until Rory’s relocation to the United States is complete, he will be working closely with an on-boarding team assembled by the NAWCC Board of Directors to introduce him to the opportunities and challenges before us and to ensure a smooth transition. Rory will be participating in strategic and financial planning immediately, which will allow him to hit the ground running when he arrives in Columbia

    You can read more about Rory McEvoy and this exciting announcement in the upcoming March/April issue of the Watch & Clock Bulletin.

    Please join the entire Board and staff in welcoming Rory to the NAWCC community.

Catastrophic 2nd Wheel Trundle Failure

MuensterMann

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Mar 23, 2008
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I just finished a typical 1920ish German wall clock movement. All disassembly, cleaning, assembly, adjustment , etc went as planned. The movement was installed in the clock and all was adjusted. The mainsprings were wound and off it went tic toc-ing away. All was fine and dandy until about 6 hours later. It stopped. The time barrel could be spun freely. What? I noticed about 2 or 3 trundles broken off the 2nd wheel. Has this ever happened to anyone out there? Perhaps one trundle gave way and the momentum took out another one or two.
 

bangster

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Perhaps one trundle gave way and the momentum took out another one or two.
My guess is that's right. Lotta torque at that wheel.
 

Willie X

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This is a fairly common occurrence. The trundles are often cracked and then break whenever they decide to. Always check this part of the clock very carefully. I've seen some that have run a long time cracked. So long that they have become loose in their holes. I guess they crack due to what Bangs just mentioned.
Willie X
 

shutterbug

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There is much information here about replacing trundles. Hopefully the trundles breaking saved the arbor from bending.
 
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wow

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Muenster, are you talking about cut trundles or a lantern pinion? If cut, do you have the equipment to make a new arbor with a cut pinion? If not, you may need to post photos and measurements and try to find a replacement or you could just send it out.
 

R. Croswell

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The most common cause for 2nd arbor pinion failure is the sudden release of the main spring, either by the spring breaking or coming "unhooked", or failure of the click, click spring. or click ratchet wheel. The issue that may have caused the failure needs to be identified and fixed or the same thing will happen again after the pinion is replaced. That spring that checked OK before may no longer be OK.

RC
 

MuensterMann

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Mar 23, 2008
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RC, thank you for this input! Soon I will be investigating the health of the mainspring in the barrel. Then perhaps I can pinpoint the root cause and assess the overall damage.
 

Dick Feldman

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In addition, whatever the failed train has been subject to in the last 100 or so years has affected the other train in that clock. The entirety of both wheel trains should be inspected for faults before putting the clock back into service.
The broken trundles on the second pinion may be only one indication of problems in that clock movement. You may find bad barrel teeth, bent arbors on the second or third wheels, and damage to corresponding pinions.
In your last post, you did not mention the clicks, ratchet wheels and return spring assemblies. Those may have been the root cause of the failure.

Best,

Dick
 

MuensterMann

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I have inspected the barrel and its teeth; click; click spring, ratchet wheel; and all are in good shape. I held the barrel and gave it a few winds that I could hold in my hand - and the mainspring was not broken or disconnected.

I removed the 2nd wheel and three trundle pins were missing and the pinion was not bent. Above the middle missing trundle pin (or where it was) there was a hole such that a trundle pin could fall out. The trundle pins are held in the assembly with a layer of solder (it looks like solder). There was a hole in the solder holding the middle missing trundle pin. See image below.

Not sure of the exact root cause, but it seems that (at this point) the failure was due to the pins breaking. Perhaps one failed and the force broke the others. It may be that the one pin fell out and the force of the barrel (the teeth) gained momentum to take out the next one. The barrel may have spun freely and the other end pin got in the way - thus it took it out as well.

Some facts and some theories!

trundle.jpg
 

shutterbug

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It has clearly had a pinion or two replaced before. Maybe they didn't do a very good job, and some slipped out due to being too short.
 

R. Croswell

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If the trundles actually broke - snapped into two or more pieces - it is likely that they are replacements that were hard and brittle. I would replace all the rundles in that pinion, remove the solder and stake the openings to retain the new trundles. I agree with Dick, inspect the other 2nd lantern pinion as well and if it has solder, replace the trundles there as well.

Unusual for a main wheel to spin free and rip out trundles without receiving some damage to the main wheel teeth. Also, just because the main spring accepts a few hand-held turns does not guarantee that all is well. Sometimes a mainspring can slip past the pin on the winding arbor when the spring is fully wound but feel like it is holding in your hand. If this were my clock, I would want to remove that main spring and have a look at the pin on the arbor. It probably could use a cleaning and oiling anyway.

RC
 

MuensterMann

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Yes, I do realize that perhaps one more half turn I could feel the slip - so yes that is still a possibility. I found one whole pin, and what seems to be half a pin at the bottom of the clock. So, not all pins are accounted for.

So, the solder technique that was done in the past is not a good method and should be avoided?

"To stake" the openings. What is meant by this verb? Does it mean to close the opening by deforming the hole?
 

R. Croswell

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Yes, I do realize that perhaps one more half turn I could feel the slip - so yes that is still a possibility. I found one whole pin, and what seems to be half a pin at the bottom of the clock. So, not all pins are accounted for.

So, the solder technique that was done in the past is not a good method and should be avoided?

"To stake" the openings. What is meant by this verb? Does it mean to close the opening by deforming the hole?
A search for lantern pinion repair should turn up examples. Make a punch with a small rectangular end that is wide enough to bridge the hole. Strike the punch to leave a mark that forces some metal into the hole to lock the trundle in place. You need to support the shroud with a split stake or crows foot.

RC
 

shutterbug

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Some people use solder, and some use LocTite ... but neither of these options are kind to the next repairman. Staking is the proper way, or Knurling if you have the equipment to do it. Any kind of adhesive, including solder, eliminates any possibility of the trundle turning in the shroud. If it can turn a little, it slows the wear considerably.
 

MuensterMann

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Perhaps solder was used to cover the hole to prevent the pin from coming out - as opposed to soldering the pin to the hole.

Anyway, I did find one tooth slightly bent barrel wheel. Not bad. I put the 2nd wheel on a lathe to discover that the arbor was slightly bent. I heated up the solder to see if I can get it to flow, but for some reason it did not flow. I may have to rid the surface solder by turning it on a lathe and then drill out the remaining trundle pins.

After putting in new trundle pins I may just press a steel washer above the trundle holes to seal the pins in. At least that is what I am thinking today.
 

MuensterMann

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As for the mainspring, it is still good. No problems. Grabbed a leather glove and would it almost completely - and no slips.
 
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