• 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.

Minute arbor screw thread

StuartG

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Aug 23, 2020
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I am working on repairing a Waterbury Winchester chime mantel clock. The minute hand is held on by a nut but the threads on the end of the arbor are rather messed up (see photo) and I want to clean them up. The OD of the chewed up threads is 0.090" and the best match to my thread gauge is 50 TPI. The closest match I can find to this is a Whitworth #95 instrument thread (Whitworth Instrument Thread) but this seems to be long obsolete. Was this thread even used on American clocks?

Is there anything I can do to clean this up? I think part of the reason the threads are so chewed is that a previous owner has tried jamming a 4-40 nut on them to hold the hands in place. Would I be able to rethread the end with e.g. a 3-48 die, or would I have to drill out and replace the end as in a re-pivoting operation? This operation would have to wait a while since I don't have a lathe yet but plan to get one soon.

Any advice appreciated.

Minute arbor.jpg
 

Jerry Kieffer

NAWCC Member
May 31, 2005
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I am working on repairing a Waterbury Winchester chime mantel clock. The minute hand is held on by a nut but the threads on the end of the arbor are rather messed up (see photo) and I want to clean them up. The OD of the chewed up threads is 0.090" and the best match to my thread gauge is 50 TPI. The closest match I can find to this is a Whitworth #95 instrument thread (Whitworth Instrument Thread) but this seems to be long obsolete. Was this thread even used on American clocks?

Is there anything I can do to clean this up? I think part of the reason the threads are so chewed is that a previous owner has tried jamming a 4-40 nut on them to hold the hands in place. Would I be able to rethread the end with e.g. a 3-48 die, or would I have to drill out and replace the end as in a re-pivoting operation? This operation would have to wait a while since I don't have a lathe yet but plan to get one soon.

Any advice appreciated.


View attachment 629797
Stuart

First, welcome to the message board.

At .090" OD, a 3-48 nut would fit rather loose. Given that the strength required is minimal, I would suggest a common 2-56 thread utilizing a USA made die.
If purchasing a die, I would suggest that you purchase one that is threaded all the way to the end of the die on the exit side such as the one on the left in the photo. The one on the right is short of the rear die surface.
This allows you to thread from the front of the die to start and then turn over and finish up close to the shoulder.

Jerry Kieffer

fullsizeoutput_7af.jpeg
 

StuartG

New Member
Aug 23, 2020
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0
1
49
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Thank you. I will try that.

Stuart
 
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