Quote Originally Posted by lucan07 View Post
A little googling indicated that problem may well be with me using opto isolated Bob to feed opto isolated drivers but this was not conclusive, however a post on Mach3 forum got the same answer from on of the Mod's Tweakie who I class as a reliable source so hopefully new bob without opto isolation will solve my problems with axis stalls.
I have not seen Tweakie post but I am pretty sure that using double opto's won't make any difference to an axis refusing to go in one direction or the other. I would check the cables for loose connections.