Hi Bob, Im also new to mach and CNC in general so i probly cant offer much advice,but,if you could explain your setup and what your trying to achive in more detail,im sure theres someone here that can help.
what kind of spindle are you useing? does it have multiple gear ratios? are you useing step/dir or PWM to control the speed?
the more detail you can give the better.
regards
Simon