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Feedrate Slows Down for No Reason During Machining

Had this problem occur on a machine where the customer was milling across a long part. During the machining process the feedrate slows down and speeds up constantly. After troubleshooting the feedrate problem I determined that the spindle speed was slowing down as well. When the spindle speed slows down the feedrate automatically comps to maintain the recommended rate of removal and changing with the spindle speed.

The cause for this feedrate fluctuation was this particular spindle had a separate motor with V belts. The V belts were slipping during the cut. Depending on the part hardness and insert wear this problem was intermittent to the point that it would happen a bunch of times then disappear for an entire month or two.