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QT20 T Plus Z Axis Won’t Home

TripleCautionMW

Plastic
Joined
Jun 21, 2018
Hello, I recently purchased a Mazak QT20 lathe with a T Plus control. Everything worked fine (minus quill retract) when I inspected it prior to purchase. Machine was rigged professionally and transported to my shop but the previous owner did not install any kind of shipping brackets prior to disconnecting it from power. My fault for not confirming this prior to decommissioning.

Fast forward to today when I finally get power and air to the machine. The x axis homes fine but the z axis won’t home. If I jog the machine in the Z+ direction I get a soft travel alarm about 1” BEFORE the limit switch. This leads me to believe that the z axis move a bit during transportation and therefore it’s not quite sure where it is.

Has anyone ran into this issue before? If so, how do I fix it? I’ve seen some posts with similar issues in the X axis being able to temporarily adjust the X+ soft limit value. Once they home the machine then they simply set it back to the original value. Any help would be greatly appreciated!
 

TripleCautionMW

Plastic
Joined
Jun 21, 2018
This was a fairly easy fix for anyone experiencing the same issue.

Hit the Parameter key on your control. Hit the Machine soft key under the monitor. Navigate to the A9 parameter. Record the Z-1 value (mine was 3750). Change this parameter to 999999. Power down the machine to reset the control. Power the machine back on. You should now be able to home the machine axis. Once complete, return the A9 Z-1 parameter back to the original value. This same process could be used on the X axis as well, same parameter just change the X-1 value.
 








 
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