SME speed adjustment


I have been reading with much interest the thread about speed accuracy and the Timeline device.

I have an SME Model 10 turntable which has no speed adjustment on the motor controller. I use the KAB strobe and my table is fine, but I fear that if I have the chance to check it with the Timeline, and the speed is off, I will not be able to adjust it, so the exercise would be futile anyway. Currently, when the speed changes over time, I replace the belt, as SME suggests and this usually works.

Could someone suggest a method to adjust the speed on a motor controller that does not have such an option? Is there an aftermarket device that can be used to alter the voltage to the motor controller or some other method?

Any advice would be much appreciated. Thank you.
peterayer
The only way to adjust the speed on an AC motor is vary the frequency of the AC which powers the SME 10. To do this, you will need an external motor controler like the Walker or VPI SDS.

Or, Peter, a Variac, as we described. They are available on ebay or easily from scientific supply houses if you would like a used one.

Best to You in your Search,

David
A Variac will not work to adjust the speed of an AC motor. AC motors are synchronized with the frequency of the AC supply current. A variac only alters the voltage, not the frequency.