Now I am ready to figure out what to do for the spindle drive. The project is a 1972 Clausig NC lathe. The original paper tape fed controls are long gone. I actually have the owners manual. The original lathe had a 5 HP motor and a variable speed transmission similar to bridgeport heads and many machines of that era. But that variable speed drive is no longer with the lathe. The next owner fitted a large PMDC motor to the machine - which I still have. IT is a beast of a motor with tachometer feedback. The nameplate has a continuous stall torque of 300 (in-lbs?), a peak amps rating of 320 amps, 4000 RPM and 217 VDC. https://drive.google.com/file/d/1O1217d-umZHpIvBtVZ4XCjMkOsplnwgu/view?usp=sharing Information in the manual indicates that original max spindle speed was likely 2000 RPM. THe spindle is geared by a timing belt that has a motor pulley of 30 and a spindle pulley of 47. The next owner of the machine - who I purchased the lathe from removed the DC motor and installed a 1750 RPM 5 HP 220V 3phase Baldor motor. The 5 HP baldor is currently mounted on the machine. https://drive.google.com/file/d/1aBlcbBWQ48A-brels9UIhQqBcvd0fiXx/view?usp=sharing
Now what to do about the drive for the spindle? 1) Keep the 5HP motor and use a VFD to run the motor faster to get my 2000 spindle speed? 2000 * 47/30 = 3133 RPM. I don't have much experience with induction motor drives. Is is feasible to run my motor at nearly double it rated speed? Are these cheap single phase input VFDs any good? ebay link <https://www.ebay.com/itm/224441224652?_trkparms=amclksrc%3DITM%26aid%3D1110006%26algo%3DHOMESPLICE.SIM%26ao%3D1%26asc%3D237808%26meid%3Dff3eea0653834c509c5a592b1ba40972%26pid%3D101195%26rk%3D2%26rkt%3D12%26sd%3D183100064244%26itm%3D224441224652%26pmt%3D1%26noa%3D0%26pg%3D2047675%26algv%3DSimplAMLv9PairwiseWebMskuAspectsV202110NoVariantSeed&_trksid=p2047675.c101195.m1851&amdata=cksum%3A224441224652ff3eea0653834c509c5a592b1ba40972%7Cenc%3AAQAGAAACEOgL6rSsLbmX3BNmrTUtzjXFnK5T7FXeEWyt%252FMTCcEhYXj1eFLAyDkUF3cgxnfgzv4cbJBL17cObzrqgUBjPnSWoDV9H%252F97l1QpjsMVxHCPzucB%252FPP6ChEn65wOcJuX02OVJD1Unud%252Bu2hc2MXKi6f0Et6zxgDKdbWzIhGOiBvW50273%252FBxppgrKhznYp0UkdXIRUy29%252BbZHSIeWuW2%252Bt2I3J7EH0XSN759g%252FbRt%252FnkNo6gh5mrdMRTEfVmg8R7sG9BK7tqq2GvgeHESJB6MdVyo%252FXjdgKULT%252BhCCrID%252Bi1nAuMebMMPvcqjiP8ZBznpyFhQQ%252BdJIb%252BrSulGJT4Fr61R9furhXY91Rn0wjVaRYePwjkz42rvK7%252BZj4VzZ%252B84cXxI1MVp7yIZEMhDUePaBYQtuuAzY6Bjkvrda%252B0Klnzv7EbxROkMBtZLkytuVi1DWS7UnVKZXmtrVRDPbuWkutRYsgVU86VoOBPZjxFxeiSeNbfqhmOkPUynaoRrBtiHtYcFDu4hXI5WOobACfyF%252F%252BJCOegnmLRb1MPehF0FD%252FyY8vGKJBvCk%252B2Vwxsm%252B6BG%252F8ac00UG1xRU6jJ2KgbGncP67f52W%252FpELM%252BjXwAK6reZZc0U087Yfiigoa3UdOvlftco2KjzVUY4gHq%252B7rmfkOb%252FKqoDC0QrFWEC4GBjd6YsOFO114iU%252BTV%252B9nIh0e9bfw%253D%253D%7Campid%3APL_CLK%7Cclp%3A2047675&epid=1772324768> More Pics <https://drive.google.com/drive/folders/1U7o7AuiLQUyLCCwfV4zCoCtOD15QpmeE?usp=sharing> So far I have made my own torque mode DC drives for the x and z and that seems to be working OK. I am using mesa 7i80 for I/O. Next I need to start putting all the pieces together. The mechanics of the machine seem to be in excellent condition. Probably because the machine has had little use even though it is old. John Figie _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
