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/Nema23PowermaxII.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 MAX_ACCELERATION = 50000.0 STEPGEN_MAXACCEL = 62500.0 SCALE = 4.44444444444 FERROR = 1 MIN_FERROR = .25 MIN_LIMIT = -9999.0 MAX_LIMIT = 9999.0 HOME_OFFSET = 0.0 These values are created by stepconf While in stepconf they work perfect If I tell it to rotate 180 degrees it rotates 180 degrees and it will jog at a very high speed But in Axis only slow speed works g0 a180 gets me "joint 3 folow error" 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
