Re: Close loop steppers

> From: "David Howland" <dhowland@...>
> The recovery attempt is simple enough. Pause the other motors from

advancing

> (if they were called to do so) and attempt to move the stalled motor.

Unfortunately, you can't pause without decelerating first. If your plan is to
work, you'll need to keep count of the incoming steps from the computer
(commanded position) and constantly compare it to the count in your DRO
(actual position). If the difference between these is greater than you have
predetermined to tolerate (excessive following error) then you'll need to
temporarily increase the step frequency to the lagging axis in order for it
to "catch up". If you are planning on doing this, it might be more economical
to put all this functionality into the cnc control computer, or put the cnc
functions into the DRO.

> Perhaps there is something for someone in these thoughts. Once
> you go too far, you're almost back in the servo area again.

Heed well the above statement!

Matt