Well they know because I asked if it was ok if I mentioned them on the forum, wanted to make sure they were Ok with that before I posted.
Reason its 10mm is thats what the original ones are and just thought I would keep them the same, with that I have 800 steps per mm so thats a res of 0.00125mm which is plenty for a mill, if it had been the lathe I may have opted for 5mm pitch.
Hood