A little off topic, but I figured this would be the best place to ask, On one of our turning centers using Linuxcnc, the operator was complaining of a poor finish on the bores of the parts we were making. After a lengthy investigation, I saw that while the Z axis was in motion at low speeds ( the cutting speed range 0-10 IPM ), the motor shaft/coupling/ball screw is, for lack of a better word, ratcheting while revolving. I started checking the servo motor, its is a 7.5 KW DC servo made by Inland, from back in the late 70's. I checked the brushes, not too badly worn, made sure they moved freely, blew out all the carbon dust, and checked my resolver, which is mounted inside the servo. Nothing really sticks outs as being an issue. I watched the position command, and resolver position feedback, and you can see that the command is a nice linear line on the scope, but the feedback is choppy, matching what I see in the motor shaft. It's not severe enough to break things, or even hear it while in motion, but bad enough that the finish is not acceptable.
Any thoughts/ pointers as to what may be causing this? -- Thanks Rick Lair Superior Roll & Turning LLC 399 East Center Street Petersburg MI, 49270 PH: 734-279-1831 FAX: 734-279-1166 www.superiorroll.com ------------------------------------------------------------------------------ One dashboard for servers and applications across Physical-Virtual-Cloud Widest out-of-the-box monitoring support with 50+ applications Performance metrics, stats and reports that give you Actionable Insights Deep dive visibility with transaction tracing using APM Insight. http://ad.doubleclick.net/ddm/clk/290420510;117567292;y _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
