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Mach3 XML and Stepconfig issues.

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24 Apr 2017 17:56 #91993 by tecno
Yes we do, looks like pause is a bit shorter.

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24 Apr 2017 18:01 #91994 by andypugh
Is there a way to tell what the output from Mach3 looks like?
Do you see variation in voltage at the converter output?

Are both systems using the same parallel port hardware?

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24 Apr 2017 18:09 #91995 by tecno
Same hardware
Will have to rig oscilloscope to verify.
Have tried fine-tuning the LM circuit maybe a bit better but still like a bad two-stroke.
Think it is time to rebuild with better BoB that has PWM.

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24 Apr 2017 18:27 #91997 by andypugh
It shouldn't be necessary to change the hardware. If it works with Mach it should work with LinuxCNC.

Is the stepgen.N.frequency pin showing a steady value?

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24 Apr 2017 18:30 #91998 by Todd Zuercher
The halscope plot should look something like this. (This shot has 2 increases in frequency from me clicking the increase spindle speed button)
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24 Apr 2017 18:34 #91999 by tecno
Appears to be so.

Below my settings in Mach3 for the spindle.
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24 Apr 2017 19:35 #92002 by Todd Zuercher
We should be able to replicate those settings easily enough. Go back to the original type-0 stepgen config. With these hal line settings.
setp stepgen.2.steplen 5000
setp stepgen.2.stepspace 5000
setp stepgen.2.dirdelay 13000
setp stepgen.2.maxaccel 1875

And if it still is bad, try inverting parallel port pin 6 by adding this line.
setp parport.0.pin-06-out-invert 1

Do you happen to have a real oscilloscope? You could try looking at what the real signal from Mach3 actually looks like. (Mach has little reputation for not actually doing what it says it is.) Then try to replicate it.

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24 Apr 2017 19:54 #92004 by tecno
I think I have tried that but will try it again, but not the inverted.

Have scope, will try to maybe tomorrow.

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24 Apr 2017 20:15 #92005 by Todd Zuercher
I know, it seems like a long shot, but at this point we're flailing in the dark.

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25 Apr 2017 10:16 #92042 by tecno
Still same with updated hal, but...



Have to comment out that line to get started, but I doubt it will help anyhow.

Will try to rig scope and see what Mach3 spits out.

Cheers
Bengt
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