On Wednesday 20 April 2016 11:00:57 Thomas Powderly wrote: > if > the stepper is direct coupled to screw > > can a damper be put on the far end of the transmission > ( end of leadscrew vs end of motor)? > > may not be optimal but may help > > ( hmmm maybe a belt drive is auto damped ? ;-) > > tomp > Not in my experience Tomp. If the belt is loose maybe, but loose belts=backlash, lots of it. The way my toy mill is setup, driving the AC ball bearing mounted nut, I'd guess I have 30+ lbs of tension on the belt, and I can adjust the nut pair for less than 2 thou of backlash total. Thats also with the ball bearing wheelbase stretchers that about triple the "wheelbase" of the vways on the head's sled/gib setup. Virtually no z stiction now. If I note some when its moving slow and silent, a shot of vactra on the ways and a quickie full stroke run to distribute it will stop that for several days.
FWIW, I am seeing this same effect on the G0704 when the gibs are snugged up to stop any side to side head wiggle. Same cure, I keep an oiler loaded with vactra 68 for that within reach. But that observation was made when the Z nut holder was coming loose too. Not noticed since I took a torque wrench to those 2 screws that marry the nut holder to the carriage. I still lube it before any real work is to be done. > On 04/20/16 22:25, Claude Froidevaux wrote: > > Hi, > > > > Your are most probably in some mechanical resonance. You can try to > > tune the DM860 for this, using the tools from leadshine "protuner" > > > > http://www.leadshine.com/productdetail.aspx?type=products&category=s > >tepper-products&producttype=stepper-drives&series=DM&model=DM870 > > > > Claude > > > > Le 20.04.2016 06:33, Gene Heskett a écrit : > >> Greetings; > >> > >> One of the things I am noticing, when running this crippled Z drive > >> at various speeds, is that up to about 3/4 rps at its shaft, it > >> moves dead silently, but by 2 rps, its rattling tools off the > >> table, exactly as if is was being full stepped, and it doesn't > >> become at all smooth again until its moving the head at 25 ipm or > >> more, then stalls at just under 48 ipm. > >> > >> 2 related questions then; > >> > >> This is a DM860 drive. It it known to drop the microstepping at an > >> unusually low rps? > >> > >> I'm looking at the DQ2722MA, 110-220VAC, 7.0A, 200 Microstep, > >> driver/psu combined, which is 110-250 volt AC powered, which would > >> remove the 350 watter doing that job now, but its close to $185 in > >> a box on my front deck. So by the time I get the 906 oz motor Greg > >> B. recommends, and hang some counterweighting springs on this thing > >> I'll have close to $300 USD in solving this problem once and for > >> all. > >> > >> What say you folks? Will this truly solve it? > >> > >> Thank you all. > >> > >> Cheers, Gene Heskett > > > > -------------------------------------------------------------------- > >---------- Find and fix application performance issues faster with > > Applications Manager Applications Manager provides deep performance > > insights into multiple tiers of your business applications. It > > resolves application problems quickly and reduces your MTTR. Get > > your free trial! > > https://ad.doubleclick.net/ddm/clk/302982198;130105516;z > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > ---------------------------------------------------------------------- >-------- Find and fix application performance issues faster with > Applications Manager Applications Manager provides deep performance > insights into multiple tiers of your business applications. It > resolves application problems quickly and reduces your MTTR. Get your > free trial! > https://ad.doubleclick.net/ddm/clk/302982198;130105516;z > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users 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> ------------------------------------------------------------------------------ Find and fix application performance issues faster with Applications Manager Applications Manager provides deep performance insights into multiple tiers of your business applications. It resolves application problems quickly and reduces your MTTR. Get your free trial! https://ad.doubleclick.net/ddm/clk/302982198;130105516;z _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
