Record clamp/weight and turntable speed

@bdp24 Yeah. That's what I have.

Get an Ap called "RPM" on your phone and see for yourself. If your turntable is DD or using an AC synchronous motor it should not matter.
It should also not matter with a well controlled DC motor. In Short, If it does change your turntable's speed it is junk, throw it away and start over. If the weight is changing speed so is groove friction which varies.

Hey all. So today I thought for the first time if having a substantial weight or clamp on the spindle affects the platter rotation speed. It doesn't for me, as far as I can tell, but if not, why would that be so?

It can happen ONLY with belt drive turntable!

For Direct Drive this problem is irrelevant and not exist even with high mass platter mat + heavy record weight or clamp. 

This is by far the best clamp/weight I even owned!  

Enough torque will be fine for additional weight.

G

@chakster , speed fluctuations can happen just as easily with a poorly designed DD table as with a poorly designed belt drive. Well designed tables of either type do not have this problem at all. The only thing you can say about the DD turntable is it will start up almost instantaneously and sound universally horrible:-)
It is not at all a matter or torque. It might take a little longer for a low torque table to get to speed but that is all. Once the platter is in motion it takes very little torque to keep it going. Even the lowly AR XA runs just fine with a record clamp.