Hi, I'm really confuse with this, I read the manuals and the videos but can't solve it.
1)My lead screw are: 1/2-10 ACME Lead Screw
http://cgi.ebay.co.uk/ws/eBayISAPI.d...m=330287884711
2)Micro step is set to 1/4 in drivers
3)Motors are NEMA 23
4)The motor is are directly coupled to the lead screw
which "Steps per" I should use in mach 3? 
Should I use Inches instead of mm in the "Default Units" becasue of my setup?
Many Thanks