On Tuesday, February 10, 2015 05:48:24 PM [email protected] wrote: > Has anyone tried something like an encoder on the lead screw of a > lathe, a stepper on the cross feed, and LinuxCNC to synchronize them. > Could be used for tapers, curves, etc.
I considered that, but since I has so much backlash between there and the tool tip, mostly in the half nut, I took the chicken way out, made a new apron to mount the ball screw nut to, bought a cheap Chinese 16x5 ball screw (its a 7x12 toy) and made home-made taper lock hubs to adapt one of the 40 tooth change gears to a 425oz motor shaft, did the same for an 80 tooth from the change gear kit to put it on the end of the Chinese screw. Works quite well at up to 60 ipm rapids. I put another 425 on the back of the carriage, with a teeny 8mm ball screw with a no flange ball screw nut I put in a steel cage to anchor it. Then last summer I cabbaged a 1 hp treadmill motor that is now working well using a scrap pile 1.5kw psu, and one of Jon's (Pico) servo drivers to run it. That amplifier is amazing and I will recommend it heartily, but for CCW use to drive a spindle the toroids need the next heavier gauge wire in the windings to control ohmic heating. IACS, like a servo motor driver, its a great amplifier. I have yet to measure the power bugs at more than 3F over ambient, they are very very good switches. It has done some interesting work for BP rifle parts since. Basically, without a ball screw drive, an encoder on the carriage drive screw is not much better than a SWAG. You would be much more accurate to put a DRO resolver on the carriage. Resolver may not be the correct word, its the same as the thing they use in fancy DRO kits. Overgrown 6" digital calipers we all own several of. Those you can feed back to linuxcnc from what I've read here. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS ------------------------------------------------------------------------------ Dive into the World of Parallel Programming. The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
