Shopsmith Forums

I just complete my Power Pro upgrade of my SS 520. I followed the belt tension adjustment and all other adjustment directions in the DVD Video and the printed instructions. My Power Pro runs very quietly at speed.

My question is regarding start up. When the motor first starts to spin (with saw blade or nothing attached to the primary spindle), I get a rumble for the first few revolutions. After it comes up to speed, it is quiet and smooth.

When I have the Jointer attached to the Headstock, I do not hear the rumble at start up.

The rumble does not happen all the time. Many times the first and/or second time starting the SS it starts with no rumble, but after the first and/or second start up, it rumbles at start up.

I have not been able to adjust the rumble out using the eccentric bushing.

Is this normal or is there something else I need to adjust.

Again, during use and when running at speed, it is quiet and smooth.

Thanks for your help.

I believe that is a normal occurrence.
It has been described by Tekna Tool and SS as the electronics computing the torque and rpm and making some quick adjustments. With a load attached (jointer etc.) the effect is dampened to some extent. What you describe sounds normal to me. Unless my PP is bad also. But I don't think so!!
Bill V

Yes, this is one of the normal noises made by the PowerPro. Unfortunately it happens to me as well. I'd rather not have that "feature" but it seems it's there to stay. I take notice every time it starts with no beginning rumble. Wow! maybe it's going to go away? HA! HA!

Thanks for your input. I feel better about using my Power Pro. I was concerned that I could damage it.