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IBM Simplex synchronous clock rattling?

pianoman

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Nov 19, 2006
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(Tagged as IBM because IBM and Simplex clocks are virtually synonymous)

I've had this Simplex synchronous clock for over 10 years, salvaged from a building where it was taken down presumably because the correction didn't work. With Harold Bain and other NAWCC member's help, I was able to revive the correction, specifically thanks to a box of spare parts Harold graciously sent me. It has worked great ever since then, correction and all, with one exception: the movement makes a rattling sound that I just can't seem to find! I don't know if maybe the motor itself is rattling, or if maybe something inside the movement is not quite right. I've attached a video link below, does anyone have thoughts on what might be going on, or maybe you've seen this before?

 

roughbarked

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OK. You need to make a couple of washers preferably nylon but I've made a lot of them from the hard plastic packaging that comes on just about everything.
You'll need to pull the motor apart and put washers on the shaft at each bearing. It quietens them down quite a bit. While you are there clean and oil the bearings and shaft of course. Otherwise, you need a new motor.
 

pianoman

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Nov 19, 2006
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OK. You need to make a couple of washers preferably nylon but I've made a lot of them from the hard plastic packaging that comes on just about everything.
You'll need to pull the motor apart and put washers on the shaft at each bearing. It quietens them down quite a bit. While you are there clean and oil the bearings and shaft of course. Otherwise, you need a new motor.
Oof, OK, that sounds doable, but I'm a little concerned about the motor. Am I looking at premature motor failure if I don't insert the washers? It seems like these motors are not being made anymore (at least according to American Time) so I'm a little concerned about preserving them. I've already run across a few other variants of Synchrons that I wasn't able to salvage with my limited skills, and was not able to replace because they're long out of stock.
 

pianoman

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One other thing I just noticed: when I power the clock down, it makes this “KNOCK KNOCK KNOCK KNOCK” sound as it winds down. I realize it could all be related, but does that maybe indicate excess up/down play in the motor shaft?
 

pianoman

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I took the motor off the back today, and I noticed two things:

  • There is definitely play in the motor shaft; I can move the small gear on the motor up and down by hand, so that's likely my main problem
  • It looks like there might be some damage to the "reverse gear" inside the clock (reverse meaning it's a hole where a gear goes, rather than a gear itself...hard for me to explain) 20-11-10 20-48-17 2160.jpg
I need to check my other parts in the garage, but I don't think the piece in which the motor gear sits should have rounded edges. It looks a bit more like a polygon than a gear.
 

pianoman

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Nov 19, 2006
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Time Savers still has sychron rotors and movments in stock.
Thanks, I’ll look into them! I know ANB collectibles still stocks Hansen synchronous motors but I do have to find out if I need a left or right hand motor (counterclockwise or clockwise).
 
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