Thanks, I probably should have started a new thread, but when I asked the first question I had. I idea it would lead to so many others.

I believe I have worked out how the Hickory control will give the command for the Fanuc AC spindle drive to run and control speed.

What I can’t understand of how the drive will give feed back to the control. The Fanuc drive gets feedback from the spindle encoder, but how is the position information transmitted to the control?

The drive has a Speed Arrival output which I think must transmit the position, but I don’t see where that would be received and coordinated with the axis drives for threading and such.

Gary