CNC Repair Tip #6: Mori Seiki Lathe Not Moving in G01 Feed Mode
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Every now again, I get a call about this CNC repair problem: The machine (always a CNC lathe in my experience), suddenly ceases to feed toward the part in X or Z axis in the G01 (feed) mode. Handwheel works, zero-return, rapid are all fine. It’s when the machine is programmed in inches or millimeters per revolution that you would see this problem. I think most people who work on CNC machines may know the answer to this one pretty quickly, but for those who may not, here you go.
If the spindle encoder belt is broken or falls off the pulley for some reason, the machine sees no revoltions in your inches or millimeters per revolution. It is unable to feed the axis as a result. This is the small belt on the pulley in the upper left of the picture. In the most recent case I was told about, one of the spindle drive belts was frayed and a strand pulled the encoder belt off the pulley.
This information applies to most SL series MoriSeiki lathes and probably countless others using the same type of encoder for the spindle.
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