What voltage are you running to your motor?
What amperage do you have going to it?
That is an 8-wire motor. Do you have it wires in series or parallel?
In parallel you should be at about 50 volts and 6 amps
In series you should be about 115 V and 3 amps.
If you are running a 10 TPI lead screw with the drivers set for 1/2 step then you should be 2000 steps per inch in your controller software.
Are your gibs too tight?
Lots of things to consider.