dear Tweakie.
thank for yr advise,
I re install my pc ,and scan with anti virus ,dellete all un neseccery program ,re install mach 3, the motor run smoothly now,
in motor tunning , I set 200 , but unly 1/3 turn for 10 mm ,should I set this stepp per to calibrate with the 3mm pitch ballscrew become higher ?
but yesterday ,4 turn in 10 mm .
pls advise