On Sun, Feb 18, 2018 at 2:10 PM, Gene Heskett <[email protected]> wrote: > On Friday 16 February 2018 06:16:00 Chris Albertson wrote: >
> That I have figured out finally Chris, its moving close to 100 ipm with a > 32 to 42 pulley set in the z on my Sheldon but its noisy as can be in > the 7 to 20 ipm box. Its noise telegraphs up the keyboard shelf mounted > on its mounting bracket. I'd had to put a 1/4" high fence around the > edge to keep other stuff from vibrating off including the keyboard > itself. Its also running an a few more volts than it was on the mill > with its heavy head. 7 more volts IIRC. X is slow, but if I ever get off > my duff and make a thin vibration damper, I think that would bring it up > to 60 ipm. Its a nema 24, 8 wire, wired parallel and getting all a 2m542 > can give it at around 43 volts. Neither motor is best match, but what I > had, or could get in the crowded area behind the new apron. Seem like you machine runs into some form of resonance at 7 to 20 ipm. I'd like to see a controllers that can be reconfigured in real time. for low speeds you might use 1/8 steps them move to /14/ and full steps at higher RPM. It could be built. But simply going to a digital drive might be enough. I also have an M542. One of the things I want to do is compare it with an A/B test to a DM542. The newer one with e "D" is digital and the manufacturer claims a significant reduction in noise and vibration. They cost about the same. (I'm making a test jig for another project where I measure the strength of 3D printed plastic gears. It will use the same motor size.) I also want to try one of their new "closed loop" motors which people on you tube have demoed. Those are even better running but cost about 60% more. I can do this because I need to buy more motors, quite a few more as the thing I'm using the mill and lathe and printer for also uses motors. I did some more calculations again, The static load of a milling head on one vertical dovetail means that power is required even when moving downward slowly. In theory if there were no friction we should be able to generate power by letting the head fall down which would spin an electric motor With a vertical acme screw more then half the motor power goes into overcoming friction. In a few months I expect to have real data on vertical ball screw performance and also onplatic gear strength and the three types of stepper motor drivers. Maybe longer because client are calling be more now, work seems to be picking. Darn. -- Chris Albertson Redondo Beach, California ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
