[QUOTE=JAZZCNC;42305]Your missing steps are not likely to be from cutting or drilling with wrong settings given the slow feeds you were using and the fact the head is so easy to move.

I think the step,losses was because the motor was stalling, the figures in motor settings were from using a digital callipers to measure the distance traveled in settings.
easy way of calculating them, backlash was with a dial indicator.
It's working ok as,I'm able to drill 20 odd holes 30mm deep and go back and drop the drill back down any of the holes. Lot of reading and experimenting at the moment. As they say turning big bits of scrap into smaller bits.