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23 July 2020, 11:38 PM | #1 |
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loose sweep seconds hand not gripping pinion well
I welcome any ideas on how to tighten a loose sweep seconds hand that is not gripping the pinion well enough. It spins freely around even though it is fully mounted on the pinion.
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23 July 2020, 11:58 PM | #2 |
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Probably best for the technical threads.
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24 July 2020, 01:01 AM | #3 |
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Are you sure that it's the correct hand for the movement?
Hands are delicate, but the hollow shaft can be squeezed slightly for a tighter fit .
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24 July 2020, 01:12 AM | #4 |
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Thank you......the hands are correct......hesitant to squeeze the shaft but that is what it may take
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24 July 2020, 03:22 AM | #5 |
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Go to the Rolex Watch Tech area at this site. More assistance will be available there.
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24 July 2020, 03:26 AM | #6 |
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And welcome to the Forum Mike
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24 July 2020, 03:52 AM | #7 |
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There’s a tool for tightening hands
https://www.esslinger.com/bergeon-30...ube-tightener/ Buying a new hand might be cheaper if this is a one off. There are ways to bodge a fix without buying the tool, but I can’t say that I officially endorse them. |
24 July 2020, 04:04 AM | #8 | |
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Quote:
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24 July 2020, 04:52 AM | #9 |
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You can carefully tighten them with a pinvice
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24 July 2020, 05:40 AM | #10 |
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24 July 2020, 05:45 AM | #11 |
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It's just squeezing a small tube bud, no magic here
Just gotta do it very carefully, easy to go too hard and ruin it (been there, many times) |
24 July 2020, 05:48 AM | #12 |
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24 July 2020, 06:33 AM | #13 |
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Some of us have been there
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24 July 2020, 11:51 AM | #14 |
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I personally prefer tightening them in a lathe collet if no Bergeron hand tightening tool is available. I will add that the hand tightening tool is a fantastic tool!
I do wonder, however, if the OP is referring to the pipe actually being loose on the hand, in which case the pipe needs to be re-riveted with a pointed stake. |
24 July 2020, 01:11 PM | #15 |
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Regarding what approach to use for correcting loose sweep hand tubes (more commonly seen in the 60’s – early 70’s vintage watch) all three applications as mentioned in this thread will work.
My thinking of varying calibration applications: All three methods mentioned in this thread thus far will work with closing a sweep hand tube if more friction is needed. The first pick (if available) would be to use the Bergeon Tube closer. These collets are nicely rounded, conforming to a tube for closing. Secondly, the torque needed for a delicate closing is more controllable. The second pick would be the lathe with appropriate chuck. The end result will work, however, due to the three jaw collect, there will be a little more crimping around the tube. The third pick would be to use a pin vise. Little cost for one of these tools and readily handy at the bench. However, the four-jaw pin vise leaves a defined crimping. It will increase the friction fit, just not as clean. |
24 July 2020, 09:47 PM | #16 |
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Success....the hand is now on and secure. Thank you for all your suggestions especially the Bergeon tube tighter...great to have access to the pool of experts available in the forum.
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25 July 2020, 03:20 AM | #17 |
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Good job, Mikyl
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