VPI TNT Turntables

Fellows,

I am no engineer (though I did stay at a Holiday Inn Express) but I have experienced how greater mass/weight has more inertia and would be much harder to change the speed than would one with less mass/weight.  For example, picture changing the speed on a playground merry-go-round that is empty, vs. one that is totally weighted down by a full load of equally distributed passengers.  It will take much more effort to slow down or speed up the heavier one.  The flywheel effect in cars and trucks is another example of the heavier, more massive one continuing to spin at a more stable rate, while the lightweight one will lose rpm more quickly.  I have noticed this too when sharpening tools on a blade sharpening wheel.  It takes much more force to affect the speed of the heavier wheel.  It seems to me that the heavier more massive turntable motor flywheel would be more stable and would be less susceptible to external forces, like fluctuations in power supply, intermittent friction, etc.  I am sure I'm wrong, please explain why. 

phoenixengr,

I am going to interpret that as an agreement to what I said.  All of my examples are increasing the mass and the inertia, right?  So the vpi flywheel would be more stable, due to its increased mass?  The more massive flywheel in motion would be more likely to stay in motion, compared to just a simple motor.  We are talking about the speed stability of the motor/drive system here.  You seem to be agreeing, but believe that the two belt implementation is faulty?

phoenixengr,

The Hurst motor on my Classic One started making noise within a few months after I started using the table.  I installed a replacement and it wasn't smooth right out of the box, but has since smoothed out.  I doesn't inspire confidence.  The BLDC motor sounds promising.  Do you know where one could be purchased?  You mention that yours in custom; does that mean that your standard psu/tach would not work with a BLDC?