Neale,
your solution seems much better. I was a bit confused about that particular solution. Too much electronics and chance to mess.

Quote Originally Posted by Neale View Post
but there still seems to be a bit of a debate about how much the squaring operation needs to be done, and whether you can't do it manually almost as easily.
I thought so before, but not now. Every reset with steppers results in a positional error. Yeah, for a wood working machine not a big deal, you can adjust from time to time by hand against hard stop. Not so for a more serious machine where more precision is required.