Pully setup with VFD

[wawoodman]

I got my VFD hooked up the mill. Yippee!

It's the 1140 RPM motor, so pulley speeds are 4200, 2940, 1620, 780, 470, 245. Any suggestions as to where I should set it? I know I can shift the pulleys whenever necessary, but what's the tradeoff (if any) between speed and torque, going through the VFD?

 

[TOOLNUT]

Hi Woodman,

It might be good to remember that the only cooling comes from the rotation of the motor fan.
Slow motor speeds make lesser cooling.

Therefore I would suggest that you set the pulleys to make the motor run as fast as you can to yield the desired spindle speed. ( I'm talking about normal speed ranges here, as going beyond the normal speed of the motor will bring up a new set of possible problems. ).

Don't try to make a grinder out of it unless you are totally familiar with these possibilities.

Jerry