Hi Clive S thankyou and I do appreciate your advice its just I know of cnc machines running on 24v and m10 threaded bars with no missing steps. I will consider changing and increasing the psu voltage if necessary I want to explore all avenues. The machines I know of that run on 24v don't use the tb6600 drivers but they use gecko ones which at the moment are out of my price range as I am just a hobbiest. I will however keep your advice on hand increase that is the route I decide to go.

Cheers Neil