Need Help! Stepper Whirrs without load - CNCzone.com-The Largest Machinist Community on the net!

cablood · #1 03-03-2011, 11:01 AM

I am running stepper motors from the KL-8056D unit with the KL- 6520 (65volt) power supply controlled through a C35 - QUICK SETUP BREAKOUT BOARD running off of a SmoothStepper USB Motion Control Interface for Mach 3 running Mach3 software.
When the motor (1350oz) has a load on it, it runs fine, BUT without a load on the motor it will not. Sometimes it turns and sometimes it freezes (whirrs). It cannot be tuned, it does this at all settings. Even with a light load I have this issue.
I have also tried a 820oz motor and it does the same thing.
This motor is turning a 60 inch ACME screw horizontally with a 40 lb load on the screw and fails to turn as described above.
It works fine with a set up where it turns two 60 inch screws with a 140lb load
Do you have any idea what is going on with this issue?

cablood · #2 03-03-2011, 12:22 PM

The proper term is STALLS not whirrs. Sorry.

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