Hi all,

So I'll try and make this short and concise. I'm going around in circles researching spindles and VFD'S, and could use some help.

I'm looking at a 4kw air cooled spindle, JGF-4.0KW.
I have found them with and without a VFD.

1. Should a vfd be rated for twice the motor current rating?

2. What is the calculation or low end speed I should expect to be able to get from the 4kw spindle?

(The top rated speed is 18,000rpm, would I be hoping for something impossible if I needed my low end speed between 5-6,000 rpm?)

Thank you for your time,

Travis