LRod wrote:

Are you saying always turn it off at a different speed than before?

What I'm really trying to convey is that you don't want to "set it and
forget it" for extended periods of time.

I had a customer once who used a Reeves drive on a mixer.

Tended to operate at the same speed for weeks at a time.

Eventually he would wear a groove in the sheave faces.

It was time for a rebuild.

By varying the speed setting, even a little bit, you spread the wear
and tear over a larger area, thus no sudden speed change surprises.

Lew