The RPM's were around 40. They were cutting steel with carbide in both cases. The interrupted cut was being done by program, but the face groove was being fed by hand (there was no pre-made program available, and we were only doing one part). The toolmaker told me he was feeding slowly with a 1/8" wide cutter for the groove when the chuck stalled. Normally running a tool into a part on a lathe with enough force to stall it would result in damage to the cutter and/or moving the part. Neither happened, which leads me to believe it didn't take too much force to stall it. When the iterrupted cut would slow the motor down (the cutter was a triangular insert) the current meter never went beyond half way. I believe the depth of cut was around .015". Also, the lathe is 208/230 volt in case it matters. |