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 Post subject: Spindle top bearing, is the turntable a gyroscope?
PostPosted: Mon Sep 28, 2020 9:32 pm 
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Victor II
Joined: Wed Dec 04, 2019 9:31 pm
Posts: 220
I have noticed that the spindle top bearing is usually a simple plain bush or even just an unlined hole drilled in the motor frame casting. Why didn't they use roller bearings, needle bearings or ball bearings? Is it because the platter tends to behave like a spinning top and center itself as soon as it gets to a particular speed, and that therefore a more sophisticated bearing is not needed? Or were they just being cheap?


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 Post subject: Re: Spindle top bearing, is the turntable a gyroscope?
PostPosted: Mon Sep 28, 2020 11:42 pm 
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Victor VI
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Joined: Tue Dec 14, 2010 1:17 am
Posts: 3538
Location: Where there's "hamburger ALL OVER the highway"...
Probably plain economy. Most of the disc motors I have are fairly quiet.

The only one I have had much trouble with is the Talkophone: it takes a lot of adjustment to get it not to sound like a coffee grinder. I have tried to get the slop out of that bearing by various means, with only limited success.

- Bill


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 Post subject: Re: Spindle top bearing, is the turntable a gyroscope?
PostPosted: Tue Sep 29, 2020 7:00 pm 
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Victor VI
Joined: Mon Aug 24, 2009 3:08 pm
Posts: 3153
Location: Harrison Township, MI
Daithi wrote:
I have noticed that the spindle top bearing is usually a simple plain bush or even just an unlined hole drilled in the motor frame casting. Why didn't they use roller bearings, needle bearings or ball bearings? Is it because the platter tends to behave like a spinning top and center itself as soon as it gets to a particular speed, and that therefore a more sophisticated bearing is not needed? Or were they just being cheap?



Unless they're high precision bearings, (which are expensive), roller, needle, & ball bearings can actually produce noise. A well lubricated plain bearing will be quiet and last 120 years, (and counting). There is no gyroscopic effect at play here.


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