Quote Originally Posted by artmin View Post
I’ll do what I can to help, though I’ll have to do a bit of revision as I don’t remember a lot of it.

The one component that I added to ensure separate grounds was a small reed relay: using lpt2 pin 14 for a voltage supply and grounding it using pin 1 let the relay output switch the vfd on & off. Pin 18 sends the variable voltage to the vfd for the variable speed.

How far have you got yourself?

Gavin
Well, not far, since i haven't bought the spindle or VFD yet. I first need to know how easy is to install it, and if it works. From what i've seen it works, but all i need to do is create a decent cable to control the spindle speed and the on/off with the LP2 output?