On Wednesday 25 January 2017 12:56:34 Jon Elson wrote: > On 01/25/2017 03:07 AM, Klemen Živkovič wrote: > > I just checked: > > http://www.automationtechnologiesinc.com/products-page/ac-servo-moto > >rs/the-ac-servo-driver-ac-servo-motor-400w-set > > > > to replace my 12Nm steppers - the torque on this motor is 1.27 Nm > > (they rate is as high torque servos) - and is not near 12Nm, that my > > nema42 steppers now provide. > > Guess I need gearbox but this would introduce backlash - or there > > are some brushless servos with around 12Nm torque available? > > Peak torque is 3.8 nm. > > > Any ideas who can provide 12Nm servos if they exist at all? > > You can look for Fanuc motors. The old 1-0SP is rated at 15 > nm peak. The (alpha)M6/3000 is rated at 6 nm continuous > stall, so should do 12 nm peak easily. The (alpha)6/2000 and > (alpha)6/3000 have similar ratings. > > And, your NEMA42 steppers may have 12 nm HOLDING TORQUE, but > they rapidly lost torque as the speed increases. Depending > on the driver, you may only have 6 nm torque available at > somewhere between 100 - 300 RPM. > > Jon > Jon
Thats the problem I had with that 1600oz/in on top of the G0704. Replaced it with a shorter nema34 that claimed in the mid-900 oz/in territory, and went from 28 ipm to 90 something ipm up and down if the post is freshly oiled. But I changed the drive to one of the line powered gizmos the said it was a bit higher powered than the DM860 drive at 60 volts, but the DM860 can run it just short of 3k revs sitting loose on the table. And it is now running the carriage on the Sheldon with a 30/40 geardown at 90 ipm, happy as a clam... =============================================== Now I need the next higher current step up from an M542T, something that can shove 5+ amps steady at just north of 45 volts into the nema23 version of these motors I just bought. The smaller, 8 wire nema24 motor has an 8mm shaft, whereas the bigger nema23 has a 10mm shaft. and my spare 20 tooth has a 10mm hub. But no tailshaft for a damper, or room for one if it did have a tailshaft. So I guess I'm going shopping on fleabay again. Get me a 20 tooth pulley with an 8m hub too. I did get a tachometer dial, and 3 tally leds under it running. One tally turns green when a signal is sent out to turn on two of the chinese 40 amp SSR's, the vfd will be across the full 254 when they are on, and the psu's for the xy motors will be on just one leg. The idea being to have a way I can park things for the night without leaving the motors powered up. Triggered by motion.motion-enable. The fwd/reverse leds are switched by the encoder output. 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> ------------------------------------------------------------------------------ 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
