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Author Topic: strange behaviour / offset  (Read 6806 times)

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Offline Hood

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Re: strange behaviour / offset
« Reply #20 on: September 29, 2012, 03:21:14 AM »
The last test sounds like its missing steps on the Z positive moves but as you say its opposite to before then it could be a drive issue.
Hood
Re: strange behaviour / offset
« Reply #21 on: September 29, 2012, 05:24:43 PM »
ok... so did more test and here are the results

- exchanged the drives and same result.
- re-done the wiring between drives and interface board (to avoid misconnection or inverted pulse)
- changed feedrate of the test program and noticed that x and y where also getting some shift at some feedrate.
- the did a test full speed (5000mm/min). result is no visible shift
- so basically the lower the steps per min are and the more drift I get.this is why at 50 microteps it was not as obvious as now.

previously with the original JNC-40 USB interface card, it was crashing a lot but at least there was no shift like now.

could it be the CSMIO interface card? if so why?

i have no more idea on what is the issue...

thanks.

renaud



as a summary of my setup:
my motor specs:
http://00353cf.netsolhost.com/motors/Stepper_Motors/Hybrid_Steppers/85_110mm/86BYGH450.pdf

my driver specs:
http://www.leadshine.com/UploadFile/Down/MA860Hm.pdf

my interface:
http://www.cs-lab.eu/en/upload/pdf/User_Manual_CSMIOIPM_EN_rev1_2.pdf

Re: strange behaviour / offset
« Reply #22 on: September 29, 2012, 05:32:46 PM »
With the jnc USB interface signal was not in differential mode. Could it be that the driver does not work in that config?

Offline Hood

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Re: strange behaviour / offset
« Reply #23 on: September 30, 2012, 05:14:47 AM »
The drives say they are differential input, you could try connecting them single ended if you wish, info is in the CSMIO manual I linked to.
However you said things got worse when youdecreased the microstepping, did you ever try that microstepping on the other controller?
I cant think what could be causing that but if you attach your xml I will look at it to make sure there is nothing wrong in it that could possibly cause something like your problem.
Hood
Re: strange behaviour / offset
« Reply #24 on: October 01, 2012, 03:08:51 AM »
Hi,

Please check 'config/ports&pins/motor outputs' settings. Try to change 'Step Low Active' setting for Z axis. Let me know if it helped.

BR
Andrew
Re: strange behaviour / offset
« Reply #25 on: October 01, 2012, 12:29:46 PM »
as surprising at it might be, indeed it seems to work... ???

will do further tests in the next days to confirm