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Old 9th October 2009, 06:48 PM   #1
diyAudio Member
Join Date: Jun 2004
Location: VA
Default Belt Drive Questions

Hello everyone,

I've noticed that in the high-end world of TT's its now fashionable to have one's platter be one piece and belt driven around the outside. This is opposed to the multi-piece platter/subplatter combo that used to predominate. I can come up with a whole number of reasons why driving a subplatter might be superior, but not many for the alternative, except

a). everybody else is doing it

b). its easier/simpler/cheaper

Since I'm working on some DIY TT projects, the issue has been on my mind lately. Am I missing something? Any thoughts?

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Old 9th October 2009, 08:59 PM   #2
diyAudio Member
Join Date: Nov 2004
Location: Surrey, UK
I think it might be easier to get the drive in the right place with a rim drive belt.
It's best to arrange the bearing so that the side forces are distributed evenly over its length and we can do that by having it entirely within the platter and you can then arrange the drive at the centreline of the bearing rather than at the bottom. Once you introduce a sub-platter it's much harder to do this and the bearing probably gets much longer.

On my Teres I was surprised to find that it actually did make a difference if the drive was arranged at the top,bottom or centre of the platter, I think because it was loading the bearing unevenly.
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