On Sat, 24 Dec 2011, gene heskett wrote: > On Saturday, December 24, 2011 02:26:16 PM [email protected] did opine: > >> On Sat, 24 Dec 2011, gene heskett wrote: >>> On Saturday, December 24, 2011 01:48:17 PM [email protected] did > opine: >>>> Probotix equipment >>>> 40VDC 10Amp Linear Power Supply >>>> PBX-RF RF Isolated CNC Breakout Board >>>> 3 - Uni-polar Stepper Motor Chopper Drivers >>> >>> Specs on this driver board please? >> >> http://www.probotix.com/manuals/ProboStepVX.pdf >> >>>> 3 - 280 OzIn 8-Wire Stepper Motor >>>> >>>> I have run this setup for over a year with no problems, so I thought >>>> I would create one I have a used Pacific Scientific Powermax II >>>> stepper model P21NRXA-LNF-NS-00 I could not send the datasheet for >>>> the motor so I sent the link to it >>>> http://www.electromate.com/db_support/downloads/Nema23PowermaxII.pdf >>> >>> This data sheet shows 2 things, one that it does run hot, very hot. >>> 130C in a 40C environment. To me that is too hot, but they know >>> their varnish better than I do. Any other comments I'll wait for the >>> driver specs to make. >>> >>>> I >>>> added a 4th Uni-polar Stepper Motor Chopper Drivers >>>> Wired motor and driver and they actually work >>>> >>>> Issue 1 >>>> The motor gets VERY hot >>>> I have run the other motors for a couple of hours and they got hot >>>> but the SI motor will burn your fingers after about 15 minutes The >>>> manual for the Uni-polar Stepper Motor Chopper Drivers says to set >>>> the current limiter to .145 * target_current, 2.8 amps = .406 I >>>> reduced it to .38 and it still gets too hot >>>> >>>> Issue 2 >>>> The motor is slow >>>> The label says max 1500 rpm but I can only get a fraction of that >>>> I use EMC 2.4.6 >>>> The driver is set to 1/8 stepping >>>> >>>> [AXIS_3] >>>> TYPE = ANGULAR >>>> HOME = 0.0 >>>> MAX_VELOCITY = 360 >>>> MAX_ACCELERATION = 5000.0 >>>> STEPGEN_MAXACCEL = 6250.0 >>>> SCALE = 4.44444444444 >>>> FERROR = 1 >>>> MIN_FERROR = .25 >>>> MIN_LIMIT = -9999.0 >>>> MAX_LIMIT = 9999.0 >>>> HOME_OFFSET = 0.0 > > Off topic, from this I assume its running a rotary table?
Probably but now it is just a motor sitting on the bench > > If that table has the usual 72 or 90 gear down, those settings are a bit > off. If I do gear this thing down I will fall asleep waiting for it to turn > >> From one of my ini files that included a 425oz motor on a 4" Grizzly > table, direct drive to the worm: > [AXIS_3] > TYPE = ANGULAR > HOME = 0.0 > MAX_VELOCITY = 81.8965517241 > MAX_ACCELERATION = 1200.0 > STEPGEN_MAXACCEL = 1500.0 > SCALE = 200.0 > FERROR = 1 > MIN_FERROR = .25 > MIN_LIMIT = -9999.0 > MAX_LIMIT = 9999.0 > HOME_OFFSET = 0.0 > Your setting do get me more rpms but g0 a180 results in many revolutions In the not too distant future I hope to be driving a rotary table with this So how do I adjust these setting for whatever my final reduction will be > Now, some of those I will admit are swags, set higher than needed just to > get the errors out of the way, but it works for the most part. The > absolutes are max-vel, max-accel and stepgen-maxaccel else I got stalls. 28 > volt supply to an xylotex driver board at the time. You have 40, so those > could be scaled up perhaps 25%. > > IIRC the scale is wrong, it needs upping by the gear ratio IIRC but I need > to start emc with that and recheck that. OTOH, I recall that I saw in > axis, the same # of degrees the table moved. I know it needs a backlash > setting plugged in, but I was so anxious to try it, the g-code I wrote was > always coming to rest in the same direction. But that didn't help it when > the cutting torque moved the table to take up the backlash either, and of > course a backlash setting wouldn't help unless I incorporated a .001 degree > step move in the other direction as the bit was starting down the other > side of a sprockets tooth profile. > > But that is another story, the sprockets worked, with many thanks to Andy > P. for some very elegant code. > > Cheers, Gene > -- > "There are four boxes to be used in defense of liberty: > soap, ballot, jury, and ammo. Please use in that order." > -Ed Howdershelt (Author) > My web page: <http://coyoteden.dyndns-free.com:85/gene> > No one becomes depraved in a moment. > -- Decimus Junius Juvenalis > > ------------------------------------------------------------------------------ > Write once. Port to many. > Get the SDK and tools to simplify cross-platform app development. Create > new or port existing apps to sell to consumers worldwide. Explore the > Intel AppUpSM program developer opportunity. appdeveloper.intel.com/join > http://p.sf.net/sfu/intel-appdev > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Write once. Port to many. Get the SDK and tools to simplify cross-platform app development. Create new or port existing apps to sell to consumers worldwide. Explore the Intel AppUpSM program developer opportunity. appdeveloper.intel.com/join http://p.sf.net/sfu/intel-appdev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
