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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

Showing 3 responses by livemusic

livemusic
16 posts
 
Agree with Vernneal. It only make sense if you enjoy the process of designing and building by itself. I do, so I'm having lot of fun along with enjoying the music on the long run; I also have learned great deal about audio. Otherwise, it is not justified economically; lots of excellent second hand TT on the web market.
livemusic
16 posts
 
Nowdays it is easy to find strong magnets for cheap on web. But,be warned that isolation from strong magnet field is extremely difficult. I have abandoned this idea after messimg around with multiply mu-metal sheet screens; my best attempt reduced the magnet field by 30% - still way to mutch to live with it. Buy at least good magnetometer for check if you wanna take the plunge.
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.
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