Question about the Schatz 54 movement

Ken M

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Feb 28, 2009
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My 1000 day clock lasted 7 months! So I tore it down. The gear on the minute shaft (?) on the dial side of the front plate appears to be pressed on. How does one service the hole and shaft? Should that thing slip off?
 

KurtinSA

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Nov 24, 2014
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Ah, Ken, you've come upon the issues with the Type 53 and 54 clocks...maybe a few others. Yes, the cannon pinion is an interference fit. I asked about this a number of years ago and there were some elegant solutions. But you need something to support the back side of the plate so you don't bend it when driving the minute arbor off. I've found using a deep well socket with some blue tape around the lip works...I make sure that the wheel on the inside of the plate will fit down inside the socket. Next I measure with feeler gages how far off the pinion is before starting...probably not necessary as it likely rests on the shoulder of the arbor. But at least I know what my goal is. Then put the hand nut back on the threads of the arbor, support the whole mess on top of the socket, and I use a brass hammer to lightly tap on the hand nut end and push the arbor down. It will go 10-15mm and then likely free up and slip off easily.

Putting it together is a bit more of a biyotch. I just did this on a 1000-day clock. This task a cluster of monkeys! What I use is a stump or anvil with a number of holes in it...it's part of a stacking set. At Timesavers search for item 15478. I think you're going to need this. So, I put one end of the arbor into one of those holes...be careful and don't let it tip and bend the pivot...DAMHIK! Bring the plate down over the arbor...keep things balanced. Drop the cannon pinion on. With a hollow punch from the staking set, slide it over the upper part of the arbor. It needs to slide down and contact the pinion and still have enough hollow shaft inside. Then with the brass hammer, start tapping to shove the pinion into place. I keep checking the clearance. Once I get close enough to the gap, I guess I'm done.

The bad part of this process is that at some point, you have to commit to putting the pinion on. On other clocks you can try out the movement and see if the clock will run. Finally you can slip on the cannon pinion, hour pipe, etc., and then the hands to continue testing. If you don't to have to take the clock apart again, you'll need to do that up front...you're committed. Believe me, I don't think you want to try the clock out and then come back, take it all apart, and then put the pinion on. Because of that middle plate and the way you have to get the arbors/pivots in place, it's excruciating. Not to mention those pivots are super tiny...they bend easily...DAMHIK.

Anyway, that's how I've come to do this. I wish I could find my old thread...I might try and look for it.

Bingo...found it:

Schatz 53 - Removal of captive center arbor | NAWCC Forums

Kurt
 
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Ken M

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"Thanks. Hmmm...all things that I don't have."

Exactly! And since I'm not going on a buying spree right now, a drop of oil and call it done for now. My problem is the mainspring. It clunks and bangs when winding and unwinding. I worked it over and got some oil don there. I still don't have the guts to try and do it by hand. I'll just order a new spring, easier and in the end probably cheaper by the time I get done. Some day if I get fancy tools I'll do it all correctly, but I need more clocks.
 

Wayne A

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Sep 24, 2019
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Most of the time you can just avoid taking the pinion off. Been using a pair of lever bars similar to paint can openers but thinner, works very well. Press it back on with staking block and brass tubing. Have polished the pinion's seating area on really tight fitting ones.

Wayne
 

Ken M

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Got other issues now. Polishing the anchor pin and it fell off. It had been soldered before. I just tried to resolder it, we'll see how that goes. I don't expect it to do well, I need to clean it all up and start over. Did't plan on such problems, but I've got nothing else to do.
 

Ken M

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Got i repaired and back together, looks like it wants to run. Got rid of the clunking and banging from the mainspring, nice and smooth. Hopefully I can forget about it for a couple years!
 

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