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Old 24th November 2011, 06:52 AM   #1
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Default Wich ways to turn your DIY turntable

Hi everyone,

I was thinking about doing a DIY turntable but I keep thinking about one problem , what way to drive the turntable.

What ways are possible (AC/DC motor , flywheel , ...)
and which do you have ?

some more info about my design includes a 20 kilo / 44 lbs platter, belt driven.

thanks Matthias,

Last edited by Thesoundmen; 24th November 2011 at 06:59 AM.
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Old 24th November 2011, 08:29 AM   #2
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20KG platter means first thinking in designing a bearing (invers, magneticm air ...) and then you can try out several motor variants.
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Old 24th November 2011, 08:52 AM   #3
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Originally Posted by Joao@AltheaMusica View Post
20KG platter means first thinking in designing a bearing (invers, magneticm air ...) and then you can try out several motor variants.
This is what I was thinking for the bearing :

Click the image to open in full size.

Brass casing, with a polished steel spindle at the bottom will come a steel ball and a 2 mm tick delrin plate.

The cut outs that you see in the middle are to minimise friction and help to lubricate the spindle
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Old 24th November 2011, 09:12 AM   #4
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How much is the diameter of the spindle? Forget the Delrin plate it will not work properly with that heavy platter. I'd recommend a gardened steel plate here as well - and by the way a rounded spindel instead of a ball pivot is pretty good.
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Old 24th November 2011, 09:16 AM   #5
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Originally Posted by Joao@AltheaMusica View Post
How much is the diameter of the spindle? Forget the Delrin plate it will not work properly with that heavy platter. I'd recommend a gardened steel plate here as well - and by the way a rounded spindel instead of a ball pivot is pretty good.
for spindle diameter I took 25 mm, so you wouldn't use a ball ? and nu Delrin ?
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Old 24th November 2011, 09:21 AM   #6
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Just did a quick calculation of the weight of the platter and I think I will get it to around 15 kilo
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Old 24th November 2011, 03:42 PM   #7
AuroraB is offline AuroraB  Norway
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This is more or less the same as the original Teres bearing - 3/4 inch with the early versions, then later increased to 20mm.....
My bearing ( still unmounted ) have a regular 12mm bearing ball recessed into the pivot end.....
20kg is rather on the heavy side, though, - just wondering what there really is to gain with the last 10kgs..... except for visual impression
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Old 25th November 2011, 08:26 AM   #8
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With my current 12KG platter I tried several combinations including Ruby etc. and I use now a rounded spindle (in reality that's the same like a ball) and a hardened steel plate. It runs perfect.

For use of a 20KG+ platter I'd recommend not such a bearing we are discussing here. Have a look on hydrostatic or squeeze film bearing. Others are magnetic or air bearing....
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Old 28th November 2011, 07:51 AM   #9
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Originally Posted by AuroraB View Post
This is more or less the same as the original Teres bearing - 3/4 inch with the early versions, then later increased to 20mm.....
My bearing ( still unmounted ) have a regular 12mm bearing ball recessed into the pivot end.....
20kg is rather on the heavy side, though, - just wondering what there really is to gain with the last 10kgs..... except for visual impression
yes indeed what there is to gain with more mass ? more stability less vibrations ? this if you have an excellent bearing of course
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Old 28th November 2011, 07:53 AM   #10
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Quote:
Originally Posted by Joao@AltheaMusica View Post
With my current 12KG platter I tried several combinations including Ruby etc. and I use now a rounded spindle (in reality that's the same like a ball) and a hardened steel plate. It runs perfect.

For use of a 20KG+ platter I'd recommend not such a bearing we are discussing here. Have a look on hydrostatic or squeeze film bearing. Others are magnetic or air bearing....
Is the rounded end of your spindle hardened ?
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