Harryn,

Sounds like you have an older model. There probably is no endcoder on your unit. It was more than likely ran on the old dos system with an ISA card in a win 3.2 or 95 system. You should go to Sherline's site and check out there backlash upgrade before you go cnc. I am not familiar with lin stepper control kits but from what I read I suppose they will do the job. If you want to run the spindle from Mach 3 you will need a few inexspensive items from cnc4pc. You could also check out Homan Designs. When your ready to take the plunge give me a shout and I will try to be of some assistance. Above all have fun!!
Jeff