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]> <[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]> <[EMAIL PROTECTED]> wrote:
Hello, I'm 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.
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