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Author Topic: Repivoting?  (Read 1504 times)
Alptraum
Guest
« on: April 15, 2009, 12:37:43 am »

Hey guys, I have an old mechanical central heating timer which is broken because one of the wheels has snapped out of its pivot, meaning that a bit of metal is stuck in the pivot and the shaft is too short. How do I repivot it?
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HAC
Steam Theologian
Zeppelin Overlord
*******
Canada Canada


HAC_N800
« Reply #1 on: April 16, 2009, 10:34:02 pm »

Best advice is to see a clock repair person, they would have the tools needed to make a new shaft and set it to the wheel.
(you;d need a jeweller's lathe to make a new shaft, and then you'd need to press out the old (if its press fit, not all are) and
set the new shaft to the correct depth to maintain the alignment. Also, you'd need to check the pivot hole for damage, and re-bush if needed)
Its not a trivial repair, methinks..

Cheers
Harold
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You never know what lonesome is , 'til you get to herdin' cows.
clockdug
Zeppelin Captain
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United States United States


« Reply #2 on: April 17, 2009, 03:02:06 pm »

I'd agree that you should see a clock repairer.  Placing a bushing in a clock plate seems to be a much more routine matter than in a watch just due to the sheer difference in size, so re-bushing the plate should be a 5 minute job.  That's if they have a whizbang bushing tool.  If they're using pin-vices and reamers the way we bodger's do it will take a whole 10 minutes.

The repivoting of the shaft is a little more of a pain.  You probably won't have to have a new shaft made.  Again due to the size of the shaft on clockwork size mechanisms it's more common to drill them out and replace the broken pivot with a section of pivot wire than to fabricate an entire new shaft.  There's enough room to do it this way, tolerances are large enough to do this without affecting accuracy and it avoids a lot of the pain with depthing.  A jeweller's lathe or some other small lathe is pretty much a requirement to do this, even if you have made Laurie Penman's magic centering jig.
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