A silly question, I'm sure....but....

...other than the roller table, are parts from a single and double roller Hamilton 940 interchangable?

Regard! Mark

The balance staff and pallet are different.

Thanks, Douglas.

77 views and only one reply tells me it MUST have been a dumb question. Ah well, my apologies. Not all of us are watchmakers and just don’t know these things.
I’ll continue my research on the question elsewhere.
Thanks.

Dr. Debbie/Lindell, you can delete this thread if you want.

Regard! Mark

Mark I’m in the process of moving so I can not locate me watch movement parts book.
You might get a better response if you ask a specific question about a watch par is interchangeable. Example;if a 4th wheel from a single roller watch will work in a double roller watch.

Mark I seriously doubt it. A 18s Hamilton has one of 4 balance staffs to choose from. the 127LC, 127SC, 126LC, and the 126SC. The 127LC and 127SC are for the single roller. The 126LC and 126SC are for the double rollers. LC is Large Collet and SC stands for Small Collet. So first and foremost you need to know if you have a large collet or a small collet in order for the hairspring to fit. Then that would leave you with a 127 and the 126. If in my opinion if you could use a 127 (single roller) in place of a 126 (double roller) then there would not have been any reason for Hamilton to have two different parts. If you could swap them then you would only need to know whether to use a LC or a SC. So I am going to say no they are not interchangeable but I am by no means an expert.

Now Hamilton staffs are pretty common. All you need to know is whether you need a LC or a SC and the pivot size to find the correct staff.

Harry

This is precisely why I never had an urge to work on watches. That is for the repair dept and qualified watchmakers.

Mark I dont think that ? was dumb at ALL. maybe the reason few answered is they didn't KNOW the answer.

All I know is anything above 525000 or so is a double roller

Hello Mark, as to your question, which there is never a dumb question, because that's how we all learn, but to the point no, they are not the same, nor will they be interchangable, some other parts besides the balance and it's parts are interchangable, hope this helps also..

Thank you all for your replies. Yes, this does give me answer I was looking for.

Regards! Mark