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Messages - hpghost

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1
General Mach Discussion / Re: strange behaviour / offset
« 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

2
General Mach Discussion / Re: strange behaviour / offset
« 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?

3
General Mach Discussion / Re: strange behaviour / offset
« 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


4
General Mach Discussion / Re: strange behaviour / offset
« on: September 29, 2012, 02:37:25 AM »
forgot to mention something really strange.

if I run a simple program like:
g1 x0 y0 z0 f4000
g1 x5 y5 z5
g1 x0 y0 z0
...

it comes back in position quite well...

5
General Mach Discussion / Re: strange behaviour / offset
« on: September 29, 2012, 02:34:51 AM »
ok... did further test. have not yet switched the drives or motor but:
- I set all drives to 10 microsteps and adjusted motor settings accordingly. which means that I divided by 5 the number of steps per rev compared to before.
- I created a program of 4 hole of 5mm deep positionned on rectangular way. after each hole the machine goes up to 10mm above the part surface.
- Then I offset the z to 50mm to have safe distance and runned the program.
- after completion I go back down and the zero is no more 50mm it is approx 44mm. which means a shift of approx 6mm. which is strange because in my previous test on the large 3d part, it was doing positive offset.

obviously by reducing the microsteps, I increased the shift...

any good idea following that test? I will shift the drives now...

6
General Mach Discussion / Re: strange behaviour / offset
« on: September 28, 2012, 11:54:04 PM »
then I should maybe reduce it to 10...it is currently 50

7
General Mach Discussion / Re: strange behaviour / offset
« on: September 28, 2012, 02:56:02 PM »
I increased motor acceleration to 400 and it seems better... will see after the 9 hrs of milling but so far it did not seem to loose steps...

any logics on that?

8
General Mach Discussion / Re: strange behaviour / offset
« on: September 28, 2012, 02:29:19 PM »
what about the microstep resolution setting in the drives...anything special to be aware?

9
General Mach Discussion / Re: strange behaviour / offset
« on: September 27, 2012, 03:19:41 PM »
Pulse is at 5

Signal is active high And configured as such.

I feel it work for normal 2mm step over passes but not for the 0.2 ones...

 I tried to reduce and increase and same...

10
General Mach Discussion / Re: strange behaviour / offset
« on: September 26, 2012, 08:50:40 AM »
no it is a 3d milling at 1600mm/min 2mm deep pass on 6mm tool at 15000rpm

I even tried at 1000mm/min and same...

could it be at the 100khz are too much when several axis are in motion together??

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