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long case clock

Plate Threads

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Lynne02/11/2016 23:35:24
80 forum posts
27 photos

Hi, wheel posts are threaded 3BA, so the spares catalogue tells me

The tapping hole for 3ba is 29 or 3.4mm, and these will not go through the hole in the plate I am looking at. I have tried to determine the thread from the range of taps I have , but no success. Any suggestions as to what may have been used.

Thanks, Lynne

Michael Gilligan03/11/2016 00:09:02
15499 forum posts
670 photos


What clock & what catalogue ?


Bob Stevenson03/11/2016 00:14:35
386 forum posts
6 photos

...........Michael beat me to it!........

If you want to know what thread then shave down a spill of softwood and (carefully) screw it into the threaded hole then compare with a thread guage.

"wheel posts" are usually called 'arbours' but they are not usually threaded.......

julian atkins03/11/2016 00:19:59
1235 forum posts
353 photos

Hi Lynne,

If you want a pukka traditional job the frame posts are secured with tapered pins, not threaded and with nuts added.



Brian Wood03/11/2016 08:45:18
2159 forum posts
37 photos

Hello Lynne,

​Please forgive me for gate crashing your post, but I have sent a PM to Bob Stevenson and wanted to catch his eye while this is still current.


Bob Stevenson03/11/2016 09:01:52
386 forum posts
6 photos

.....Hello Brian,...I have sent you an email just a minute ago!

Lynne03/11/2016 18:24:15
80 forum posts
27 photos

Thanks for the responses.

Michael & Bob. 8 day longcase, english movement, well, the name on the brass face is Geo. Booth, Manchester. Hasn't ticked for 40 years that I know of. Weights, one cast iron, could be original, the other, pretty poor lead casting. Also missing the gathering pallet, which will be a challenge. The hands need attention, minute hand broken, but I have the pieces. There is more.

Catalogue. Meadows & Passmore. They describe them as Rack & minute wheel studs. Cousins describe them as Rack & lifting piece posts/studs. The 22mm length is insufficient, I need 25mm, so I will have to do a repair. Minute post is sound, Maj. thread dia. is 3.43mm, hole dia. 3mm. tread pitch using BA guage would appear to be 3BA.

So, what to do? drill 3.4 and tap 3BA, or try to match the original form. Regards Lynne

Michael Gilligan03/11/2016 19:20:31
15499 forum posts
670 photos

Thanks, Lynne

Here's the Rack Stud, for everyone's reference **LINK**

Proper 'conservation' would mean modifying the new component [or making from scratch] to fit the existing tapped hole ... but only you can decide whether that is appropriate.


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