by david pierce » Sun Jun 12, 2011 7:31 am
Bob and Company,
I purchased a Waltham pocket watch movement from Ebay. It is marked AMERICAN WALTHAM U.S.A. TRAVELER and the serial number is 1365725. The movement runs but the center hand (it only had the hour hand) would not move. I first suspected that the canon pinion gear sleeve wasn't tight enough so I tightened it up a bit with the staking set. I gauged the depth of the dent by inserting a small drill bit into the sleeve that was a couple of thousandths of an inch smaller than the canon pinion. When I reassembled the the mechanism the fit felt perfect. Unfortunately, the hand still would not move but the rest of the mechanism seemed to be running just fine. My next suspision was that the canon gear was pressed down too far into the pilar plate so I removed it and re-pressed it; this time using a plastic dial protector as a shim to space the bottom of the gear away from the plate. I removed the shim after pressing the canon assembly back in, replaced the other gears, and it still didn't work. To rule out the center wheel arbor as a problem I removed the gears again, made an imitation hand by cutting a strip out of a sticky note, folded it down the middle, cut a point on one end, and pierced a hole into the "hand" with a needle. I pressed the paper "hand" onto the center wheel arbor and set the movement aside. The paper hand moved just like it was supposed to so I removed it and reassembled the mechanism. Again It would not work.
I removed the assembly again and looked at the mechanism from the edge. I then noticed a gear that was hidden from the plan view with a steel washer that had a screw in the middle. I removed the screw, washer and gear, and again reassembled the other parts. This time the hand moved like it is supposed to. The gear is the idler gear that connects the castle gear to the setting and speed reduction gears. The castle and clutch gears slide up and down on a square stem but the unit is spring loaded and the spring keeps the unit locked into the setting mode instead of the winding mode. This is what prevented the hand from moving. Since the center wheel arbor was spinning around in the canon sleeve when the watch was running, the canon sleeve was worn and required repinging with the staking set. This however was a symptom and not the underlying problem.
I have now isolated the problem but I do not know how to correct it. Any ideas?
David