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I think I am going to attempt to make turntatbles

First off let me say I am not new to the audio realm. I am a computer engineer and yes I realize that deals in ones and zeros. However, I have made a few custom guitars. I know a master woodworker and a talented machinist. I have been searching for that perfect table for years whilst living in mediocrity. Well, I have the resources; why not make one from scratch. More than likely I am going to attempt a belt drive unit at first using an off the shelf arm... More than likely an SME. I am working on the power supply circuitry right now as my piece. Any one have any tips... I am thinking solid, large mdf plinth with an attached copper mat and either a heavy plinth with an acoustically decoupled motor or completely detached. Thoughts?
bc5k
bc5k OP
29 posts
 
How about using a thing sheet magnet under the platter and then shield it with aluminum... much like magnetically shielding a transducer? my idea is to use some sort of less powerful magnetic field underneath the platter to levitate it against another magnet point downward... so pole differential... in theory the repelling action should float it... then there would be a layer of shielding and the opposing forces of the magnets with their backs to the vinyl should not create any undue fields... i would just have to fashion a skirt for the bottom of the platter out of aluminum as well... ooh i have an idea... have to go sketch this out in autocad right quick... bbl
cerrot's avatar
cerrot
1,700 posts
 
I would look for something other than MDF for the plinth. Maybe the ikind of wood musical instruents are made of?
livemusic
16 posts
 
Another catch in repelling magnets idea is a strong side force applied on the magnets and hence on the journal bearing, if any slightest non-concenricity of the two magnet fields exists. Magnet levitation is inherently unstable. Try to bring opposite poles together and you will feel a whole magnitude of this force. One more lesson I've learned about magnetic field isolation: the shield must be of closed contour around magnets with minimum gaps, otherwise isolation is greatly reduced.
stringreen's avatar
stringreen
6,468 posts
 
Good for you... I applaud your interest. I would caution you to keep this effort as a hobby, and not expect to make boatloads of dollars from it. I talk from experience. If indeed it turns to gold that others are willing to pay for...so much the better. Good luck
br3098
994 posts
 
Bc5k,

Good for you! I wish you the best of luck, and I hope that you have a little fun in the process.

My $.02 worth: designing a shielded MagLev bearing is not for the faint of heart, pocketbook or math skills. If you are seriously looking for an alternative to M2M or jewel bearings I would suggest that you look at air bearings. They are readily available in a variety of configurations and sizes, and are (relatively) low cost from eBay and other sources.
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