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Old 4th February 2013, 10:35 PM   #1
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Default Turntable bearing question.

Hi everyone. I'm new to the forum, apart from the time it took me to read every page of the picture gallery in the valve amps section. It's amazing what some people can build!!! This is my first thread & I hope someone has an answer to my query. I've included a very crude picture of the bearing on my new turntable & wondered if I'm right about running the belts higher up the platter? I don't want to automatically think I know better than the manufacturer so I've asked as there could be a very specific reason they designed the motor housing to run the belts at the bottom. The platter is 70mm thick & weighs 7 kilo's but I still think the belt will pull the platter over & cause more metal to metal contact than if run at the top. Thanks in advance to anyone that can help.
http://www.diyaudio.com/forums/attac...1&d=1360021215
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Last edited by Arckivio; 4th February 2013 at 10:40 PM.
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Old 4th February 2013, 10:38 PM   #2
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Pic doesn't work.
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Old 4th February 2013, 10:39 PM   #3
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Originally Posted by sq225917 View Post
Pic doesn't work.
I'll have another go. I uploaded it in attachments, not sure if thats right.
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Old 4th February 2013, 10:47 PM   #4
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It's unlikely to make any difference with a finely toleranced bearing, though the 'risk' of precession will be lower with the lower placement. A taller motor pod is at great risk of being more affected by a small angular offset from vertical than a shorter motor pod would be.

Chances are, if it's a decent deck from a reputable manufacturer that you need not worry about belt position.
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Old 4th February 2013, 10:53 PM   #5
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Originally Posted by sq225917 View Post
It's unlikely to make any difference with a finely toleranced bearing, though the 'risk' of precession will be lower with the lower placement. A taller motor pod is at great risk of being more affected by a small angular offset from vertical than a shorter motor pod would be.

Chances are, if it's a decent deck from a reputable manufacturer that you need not worry about belt position.
Now I'm going to show my inexperience & ignorance by asking what precession is? Not a bad quality turntable for the money but definitely not a clearaudio, that's why I'm questioning their choices. It's all I could afford I'm afraid while still giving in to m y girlfriands need for eye candy. There is a very slight amount of play in the bearing which is what made me think the belts would be better at the top. Thanks for the reply Sq
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Old 4th February 2013, 11:10 PM   #6
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What turntable do you have?

jeff
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Old 4th February 2013, 11:12 PM   #7
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I'm trying to make the best of a bad lot so one basic test I did do, was to run the belts at the bottom & dial it in to 33 rpm & then run them at the top & noticed I actually had to turn the power down significantly to achieve 33 rpm so it definitely is easier on the motor.
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Old 5th February 2013, 12:17 AM   #8
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What turntable do you have?

jeff
It's an FFYX from timdiyaudio. Not as bad as some might think but I think it needs a bit of work.
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Old 5th February 2013, 12:36 AM   #9
sreten is offline sreten  United Kingdom
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Hi,

The principles in the OP make sense, FWIW.

rgds, sreten.
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Old 5th February 2013, 12:40 AM   #10
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Hi,

The principles in the OP make sense, FWIW.

rgds, sreten.
It seemed that way to me but I know there's more to turntable bearings than I probably know & I'm hoping to learn what precession is :confused
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