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Vinyl Asylum Welcome Licorice Pizza (LP) lovers! Setup guides and Vinyl FAQ. |
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Vinyl Asylum Welcome Licorice Pizza (LP) lovers! Setup guides and Vinyl FAQ. |
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In Reply to: Teres : "Direct Coupling ... a quantum leap in speed stability compared to traditional belt drive" posted by J.D. on August 1, 2007 at 11:34:41:
Without an intervening idler made of rubber, one of the drive surfaces has to be some grippy material like rubber. Unfortunately, the dimensions of a piece of rubber or something like it, cannot be machined so closely as metal or guaranteed of long periods of time. (I had a reel to reel tape recorder that never ran at the right speed because the drive capstan was made of rubber, and it had compressed or shrunk over the years.)
Now by putting an idler wheel in between the drive pulley and the turntable rim, you can machine the drive and the rim to close tolerances, and it does not matter if the rubber changes size a little.
So when they claim "The Verus controller technology establishes spot on speed accuracy that will not drift over time and never needs to be readjusted." there must be some feedback from the actual turntable to achieve this. If you just ensure the drive motor spins at the same speed forever, the table will change speed as the rubber wears and compresses. I'm sure it'll stay close enough when it's new, but as it gets older, the speed will change.
But they say it can be fitted to other tables, so how do they get the necessary feedback? They probably don't, and just let the speed slowly change over time.
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Follow Ups
- There is a good reason idlers were used between the drive and the table rim. - ffrr 04:27:58 08/03/07 (1)
- Speed control - JTimothyA 20:41:22 08/03/07 (0)
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