• 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.

Winding arbor bushing--how much bigger?

jboger

Registered User
Jan 7, 2019
468
165
43
65
Country
I have a job in mind but may be awhile before I get to it. The winding arbor needs to be bushed. If I turn a bushing to the proper size, how much bigger than the hole should it be to get a proper fit?
 

bruce linde

ADMIN / MODERATOR
NAWCC Member
Donor
Nov 13, 2011
8,154
1,121
113
oakland, ca.
clockhappy.com
Country
Region
kind of depends... you're probably going to have to experiment a bit.

since it's easier to remove material than add it (doh!) i would turn a longer piece with a hole 1mm larger than the diameter of the arbor to see how everything fits... you could always make the hole bigger as needed, or just make a new one as you get closer.

also... the more specific the questions, the more specific the answers.... and vice versa. measurements would help inform the answers, as you could be talking about a mantle clock, a beefier english tall case time and strike, etc. i think the answer(s) to your initial question would depend on more specific info.
 

bruce linde

ADMIN / MODERATOR
NAWCC Member
Donor
Nov 13, 2011
8,154
1,121
113
oakland, ca.
clockhappy.com
Country
Region
that's a pdf, so you can't really enter your own numbers. here's a post from the original thread with a link to a downloadable excel spreadsheet... #18

the entire thread is worth reading.
 

jboger

Registered User
Jan 7, 2019
468
165
43
65
Country
First, thanks to both of you. I looked at the functions in the spreadsheet and realized that the spreadsheet is used to calculate the inner diameter of the bushing in order to derive a certain tilt angle.

I'm afraid my original question was unclear--sorry about that. My question was meant to be this: how much bigger should the outer diameter of the bushing be in order to get a snug fit in the plate? I think this is an easier question--I hope.

As for the inner diameter, I was planning to ream it out with a broach to fit the winding arbor. But I'm getting ahead of myself.
 

bruce linde

ADMIN / MODERATOR
NAWCC Member
Donor
Nov 13, 2011
8,154
1,121
113
oakland, ca.
clockhappy.com
Country
Region
The tilt angle is a way of telling how much bigger the bushing hole should be for the arbor. The answer to your revised question is that the outer diameter of the bushing should be equal to or a hair bigger than the diameter of the hole in the plate… That lets you snug fit it, or broach it a tad bigger to accommodate the bushing. It’s best if you don’t have to use loctite, and it doesn’t just fall out
 

kinsler33

Registered User
Aug 17, 2014
3,660
485
83
73
Lancaster, Ohio, USA
Country
Region
Don't try for a press fit. Turn the bushing's OD so it'll slip into the plate hole and then rivet the bushing in place on an anvil. Once it's locked into place you can broach out the ID to fit your arbor.

M Kinsler
 
  • Like
Reactions: NEW65

shutterbug

Moderator
Staff member
NAWCC Member
Oct 19, 2005
45,560
1,641
113
North Carolina
Country
Region
For those large bushings, I'm inclined to agree with Mark. I think that's how the factory installed them.
 

jboger

Registered User
Jan 7, 2019
468
165
43
65
Country
So what I should do is make the bushing a bit longer than the width of the plate, then use a rounded stake to flare out the bushing, followed by a flat stake to make the rivet. Am I on the right page? Sounds like this could be done on both sides of the plate..
 

shutterbug

Moderator
Staff member
NAWCC Member
Oct 19, 2005
45,560
1,641
113
North Carolina
Country
Region
Yep, that sounds close. You should have a collar on the front side, and the rounded stake should be enough on the back.
 
Know Your NAWCC Forums Rules!
RULES & GUIDELINES

Find member

Forum statistics

Threads
163,603
Messages
1,421,689
Members
84,982
Latest member
VernonCraker
Encyclopedia Pages
1,101
Total wiki contributions
2,857
Last edit
Aurora's 15 Ruby Jewel Movements by Greg Frauenhoff