On Sun, 25 Dec 2011, gene heskett wrote: > On Sunday, December 25, 2011 12:08:02 PM [email protected] did opine: > >> On Sun, 25 Dec 2011, gene heskett wrote: >>> On Sunday, December 25, 2011 10:11:27 AM [email protected] did opine: >>>> On Sat, 24 Dec 2011, gene heskett wrote: >>>>> On Saturday, December 24, 2011 03:43:00 PM [email protected] did >>> >>> opine: >>>>>> 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/Nema23PowermaxI >>>>>>>>>> I. pd f >>>>>>>>> >>>>>>>>> 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 >>>>> >>>>> That scale is telling emc how many steps it has to move the motor to >>>>> make one units worth of motion. For a table I think its 1 degree >>>>> but I can be corrected since it could be a radian too. >>>>> What I meant by the geardown, is how many turns of the dial handle >>>>> shaft on the table does it take to make one full 360 degree turn, >>>>> and depending on the table it could be 90 or 72 full turns of the >>>>> worm shaft to make one full turn of the table. >>>> >>>> I am still quite confused >>>> My ignorance is killing me >>>> >>>> [EMCMOT] >>>> EMCMOT = motmod >>>> COMM_TIMEOUT = 1.0 >>>> COMM_WAIT = 0.010 >>>> BASE_PERIOD = 28000 >>>> SERVO_PERIOD = 1000000 >>>> >>>> [TRAJ] >>>> AXES = 4 >>>> COORDINATES = X Y Z A >>>> MAX_ANGULAR_VELOCITY = 8035.71 >>>> DEFAULT_ANGULAR_VELOCITY = 60.00 >>>> LINEAR_UNITS = inch >>>> ANGULAR_UNITS = degree >>>> CYCLE_TIME = 0.010 >>>> DEFAULT_VELOCITY = 0.33 >>>> MAX_LINEAR_VELOCITY = 3.30 >>>> >>>> [AXIS_3] >>>> TYPE = ANGULAR >>>> HOME = 0.0 >>>> MAX_VELOCITY = 7633.92857143 >>> >>> Laying on the table & measuring the shaft rotation, this wouldn't be >>> very fast. a fraction over 21 rpm, nominally 3 seconds per rev. Not >>> rps, rpm. But when 'scaled' to drive a table, its way faster than any >>> stepper could be driven to at my usual psu voltage of 28 volts. A >>> big Gecko running on 80 volts, maybe. >> >> MAX_VELOCITY = 7633.92857143 (degrees per second), right????? >> (7633.92857143 / 360) * 60 = 1272.32142857166666666660 rpm >> Which is what I see whem I test with stepconf >> But locks up in Axis > > Locks up the computer, or the motor?
"Locks up" bad me I meant I get "joint 3 following error" and Axis power button shuts off I have to press F2 to continue After long boring changing ini and restart Axis I get MAX_VELOCITY = 1925 MAX_ACCELERATION = 15000 STEPGEN_MAXACCEL = 18000 SCALE = 4.44444444444 These are the maximum values that work Any higher and I get "joint 3 following error" At these setting 'g0 a..' show 115500 in Axis Vel indicator I assume this is degrees/minute ~ 320 rpm Also 'g0 a180' causes the motor to turn 180 degrees so all I have to do is multiple SCALE time whatever my final reduction turns out to be I would still be interested if someone could explain, in simple terms for me, why stepconf settings do not work Richard ------------------------------------------------------------------------------ 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
