Loud Motor Hum - Solved!

[Jan]

If using your Tormek on a proper surface - You likely never will experience any hum or serious vibration.

When I use mine on a 'poor' work surface is the only time that I have issues with vibration.

That´s correct and precise observation, OW! 

Tormek grinder generates wide spectrum of vibrations. If the natural frequency of the potential resonator (work surface, lamp, jig, water trough) is near to some pronounced frequency in the Tormek spectrum, it starts to resonate soon.
If it is not the case, the potential resonator needs more time to overcome the damping and to start produce an audible hum.

Jan