I am back to making slow forward progress on the Clausing NC since putting on hold back in March. The lathe came with the 5HP motor already mounted and I have kept this as is from the previous owner that gave up on the retrofit. The original lathe had a mechanical variable speed drive with pulleys similar to that on a bridgeport variable speed head. I have mounted and wired up a Huanyang 7.5 Kw VFD for the motor and first ran the motor today. I am using a 7.5Kw inverter to allow for derating for single phase per Huanyang recommendations.
I have about 1" of deflection in the belt. The belt seems quite noisy when running the motor at 1725 RPM. I have not yet attempted to run the motor at 3200 RPM which is my goal to get 2000 RPM spindle. Are these kinds of timing belts usually noisy? The original clausing manual says have 1" of belt deflection - but they don't specify a force. Also the original timing belt was probably about 3/4 as long as the one I have now because of the way the variable speed drive was mounted. There isn't much clearance between the belt and the z axis motor like 1/4" but increasing that clearance would make less clearance to the spindle drive encoder (not mounted at the moment). https://photos.app.goo.gl/hSYW84zZsdnoKdr79 Motor running at approx 1725 RPM https://photos.app.goo.gl/FxjZn6QRmztM1TQk8 John Figie _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
