Hand bushing

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Hand bushing

New postby Irwin » Fri Oct 24, 2014 3:30 pm

This minute hand is totally loose on the canon pinion of a JUF torsion clock.
I've tried a washer behind the pinion and also in front of the hand, but then there isn't enough projection of the center wheel arbor to allow me to get the pin through the hole to hold the hands in place.
I want to tighten its grip. Is there any way to close up the bushing a bit?
My alternative solution could be to file the end of the canon pinion to reduce its length and so give space for a washer.
The hand is 3.5 cms.

H1.jpg


H2.jpg
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Re: Hand bushing

New postby Marty101 » Fri Oct 24, 2014 6:29 pm

Irwin I'd tap the inside edge of the bushing at approx. 45 degree angle toward the center every 90 degrees with a screwdriver and see how it goes. Do this on the underside of the hand and the world will never know. Go slow and tap the same 4 spots over again until it grabs as tight as you want it.
Keep winding things,
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Re: Hand bushing

New postby veritas » Fri Oct 24, 2014 8:37 pm

Irwin did that work for you, what Marty suggested.
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Re: Hand bushing

New postby Irwin » Sat Oct 25, 2014 10:41 am

I worked at it but didn't have much success, so I looked at the other side of the equation, the canon pinion.
I flared the end of the pinion with a pointed punch and a couple of taps, and got a tight fit - a little too tight, as I had to file the bushing to get the hand onto the pinion. It seems to be OK now and the clock is running. Hopefully, I can now move on to regulation.

I've also been working in parallel on another JUF which has caused me a lot of bother getting it into beat. When I finally got it there, using a 0038 wire, it ran slow, so I changed the wire to 004. The time keeping improved, but it's still running slow, and there is no adjustment left on the pendulum. The next wire size is 0045 which has to be too big, and also the price of these larger wires jumps to 3 times the thinner wires. I am thinking that the only solution is going to be to run a piece of sandpaper along the 004 wire. I understand that the technique is to take one pass along the wire with a piece of folded sandpaper. I'm not sure about it.
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Re: Hand bushing

New postby veritas » Sat Oct 25, 2014 11:10 am

Yes sometimes you have to thin a spring. I am doing this on a Gustav Becker 400 day clock. I used two emory boards. First spring i went too far and the clock is slow, so i have to start over again.
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Re: Hand bushing

New postby Irwin » Sat Oct 25, 2014 2:00 pm

No other alternative, so I'm going to try it
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Re: Hand bushing

New postby John Arrowood » Sat Oct 25, 2014 2:33 pm

Crocus cloth is a good possibility; it's 1200 grit I think so very fine and used in jewelery making for fine polishing.
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Re: Hand bushing

New postby veritas » Sat Oct 25, 2014 6:55 pm

Today in clock class we were making clock collets for hands, this is another option if you have a lathe and tools.
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Re: Hand bushing

New postby Irwin » Wed Oct 29, 2014 3:14 pm

The clock is still losing more than I would like, so I've ordered a pack of 0045 wires, and I'll emery paper them down to get the time keeping right.
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Re: Hand bushing

New postby Irwin » Sat Nov 15, 2014 10:57 am

I fitted both these clocks with 0045 wires and thinned them down. I used alternately emery and sandpaper, and went slowly with the first one to see if I could work out which was more effective. I don't know which was better, if either, but I got there in the end. It took me more than a week to thin it down. The second one went much faster as I now had an idea of how much thinning was needed.
Both clocks are now running and keeping time and it's time to move on to the next one - which is on its way.

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Re: Hand bushing

New postby Marty101 » Sat Nov 15, 2014 12:05 pm

Nice work-great patience Irwin!! :D That can be maddening at times,but it is like you say-the next time is much smoother.
Keep winding things,
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Re: Hand bushing

New postby veritas » Sat Nov 22, 2014 2:43 am

I tried thinning with emory boards. I had to this a suspension spring for my GB. I went too far, so now i have two more springs to try and get it right. It takes patience to thin them, but you have to do, what you have to do.
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