Re: [CAD_CAM_EDM_DRO] servo or stepper?

nielsenbe@... wrote:

> If I had a linear encoder and i wanted to use the position data from that to
> control the movement of a rotary axis what is the best way. I need to have
> the rotary do about one rev for every foot of linear travel. I can't CNC the
> linear axis. I need it to position the rotary very accuratly along a path no
> matter what direction the linear is traveling in. That is so the it can
> reverse on the exact path it came down the first time. From what I have read
> so far a servo loop is the best way to control such things but can it use the
> feedback from a seperate and NOT controlled axis for it's position? I hope
> you can understand what the heck I am talking about. Feel free to contact me
> off list.

You want to slave one axis to another? Yes, this can be done with
servo loops. It is called "electronic gearing".

Jon