Fred, as I understood the stepconf wizzard is a brand-new feature in version 2.2.2 I also have similar problems as you are seening with the A-axis on XYZ axes:
Configuration in stepconf gives me reproducible results, the machine is 1x2 meters and the whole bridge (moving along X-axes) is about 60 kilogramms. Stepconf shows great results with speed = 60mm/s and acceleration = 500 mm/s2. What I have noticed is that the speeds that stepconf shows during the test are different from the ones seen in the axis program. Axis uses faster steps than stepconf, resulting in higher speeds (I still have to measure the real difference using the logic analyzer). And yes, this is a problem (for us) since we use stepconf to validate our movements. My settings mostly work but yesterday the machine lost steps when reversing directions so I have to lower my acceleration and try again. Differences you see are however much higher that mine. You tested in stepconf with 6 revs/s and an acceleration of 66 revs/s and you are noticing problems in axis with speeds > 1.18 revs/s. If you did not change the accelaration ramping down at this speed takes about 0.017 seconds ... A it too fast if you ask me and you'll defenitely loose steps if this is higher than your machine can handle - independent of the speed used. The way it is described in the manual: with low acceleration determine max. speed and then increase the acceleration. I know this is a problem with stepconf given wrong results and it will take some time to get values that work in axis but I think you should try to decrease your acceleration first (try 2400 deg/s2) and run your G1FxxxA360 / A0 test at different speeds. If you are confident that you have found a proper speeds, only then start increasing the accelaration. Then there is the question about your A-axis drive: From your description it looks like you are performing a direct drive with the turn table connected to the stepper motor. This will not work properly at speeds (anything above real slow). And keep in mind that the A-axis is not a lathe. I've translated your rotation speed into lineair speed. 6 revs/s with a 10mm round object equals to 10 x pi x 6 = 204 mm/s = 12240 mm/minute (73 km/h) or 1/2 inch => 1/2 x pi x 6 x 60 = 565 inch/min. Regards, Rob Quoting f m <[EMAIL PROTECTED]>: > Anyone have any ideas on this? I'm really stuck here > and would like to have a fix or a work around. > > Thanks, > > Fred > > > --- f m <[EMAIL PROTECTED]> wrote: > >> Hello, Im having some problems with getting the A >> axis on EMC working. Primarily following errors, but >> there also appears to be a discrepancy in units >> between the stepconfig wizard, (degrees/second) vs. >> EMC (degrees/minute), and deceleration at the end of >> a move. ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
