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 Post subject: Motor noise
PostPosted: Oct Tue 29, 2019 10:55 pm 
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Joined: Nov Thu 29, 2012 8:40 pm
Posts: 61
Location: Americus,KS.
I have a Seeburg m100c that has a noisy animation motor. It sounds like a coffee grinder or hair clippers.I think it is a synchronous motor ,looks like a phonograph turntable motor.Removed it from the gearbox and cleaned and oiled best it could be,didn't notice any sideplay in shaft.Playing records masks the noise but between records it is very noticeable.Anyone have any tips on quite ins the noise other than replacing with a newer replacement wich would mean replacing other items and not keeping original? Thanks for any help.


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 Post subject: Re: Motor noise
PostPosted: Oct Wed 30, 2019 4:29 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 9657
Location: 42001 KY
does it use rubber motor mounts?

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 Post subject: Re: Motor noise
PostPosted: Oct Wed 30, 2019 7:04 pm 
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Joined: Nov Thu 29, 2012 8:40 pm
Posts: 61
Location: Americus,KS.
Yes,it is on rubber mounts,have tried various combinationsDont feel any vibration.Growls even when holding in hand.


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 Post subject: Re: Motor noise
PostPosted: Oct Wed 30, 2019 11:27 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 14407
Location: S. Dartmouth MA 02748-1225 USA
tommytinker wrote:
Yes, it is on rubber mounts,have tried various combinations Don't feel any vibration. Growls even when holding in hand.
Sometimes there is a failure in the rotor, that causes a flat spot in rotation. Not enough to stall the motor but enough to cause an aberration in rotation. I used to see something similar in drive motors for the 8-tracks, however, much more severe, the motor would hunt, making playback impossible. Possibly another motor with burnt windings, swap out the rotor to keep originality. No worries if motor riveted together, drill 'em out...
Oh, another cause of noise, motor shims in wrong. Let motor center it self then determine shims. Be sure the Teflon shim is on the bottom. Rotor may be fighting to find center against wrong shim thickness.

GL

Chas

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