Setup of a MPG for gantry

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28 May 2013 01:31 #34775 by malare
How do you setup a MPG to work in World mode so you can jog a gantry x-axle?

All other axes works fine to jog with the MPG.

Many regards Per Malare

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28 May 2013 08:08 #34805 by andypugh
Replied by andypugh on topic Setup of a MPG for gantry

How do you setup a MPG to work in World mode so you can jog a gantry x-axle?
All other axes works fine to jog with the MPG.


It ought to just work (in World mode). You really don't want to be jogging a gantry in Joint mode.

How have you connected the MPG in HAL?

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28 May 2013 15:51 #34815 by malare
Replied by malare on topic Setup of a MPG for gantry
I can only send you the hal-file so you can look at it. I don't really know myself how things are done.

It's my son who is an expert on these things. He has used a file we found as a template, and made changes in it.

As you can see from the file-name we use a MESA 5i25 card for driving Gecko G540 drivers but the MPG is connected to an extra PCI parallell card.

Many regards Per Malare
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28 May 2013 16:03 #34816 by malare
Replied by malare on topic Setup of a MPG for gantry
There was another hal-file too :unsure:

Perhaps the ini-file is useful too

Many regards Per Malare
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28 May 2013 20:31 #34836 by andypugh
Replied by andypugh on topic Setup of a MPG for gantry
i will need to experiment with a configuration, which I can't do until this evening.
(I can see a way to do it, but I think it might be the wrong way)

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30 May 2013 07:55 #34939 by andypugh
Replied by andypugh on topic Setup of a MPG for gantry

i will need to experiment with a configuration, which I can't do until this evening.
(I can see a way to do it, but I think it might be the wrong way)


It took longer than I expected to get to this.

I have created a simulator config which I can test with. I can confirm that it won't jog for me in World mode either. (thou in my case I can't jog any axis)

Unfortunately I am out of time for tonight. More tomorrow.

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30 May 2013 08:12 #34940 by andypugh
Replied by andypugh on topic Setup of a MPG for gantry
A bit more on this.

www.linuxcnc.org/docs/html/man/man9/gantrykins.9.html

Says that incremental jogging doesn't work in World mode.
I think there is a way round this, using the jogwheel speed as a velocity-jogging request. But I need some time to see what that takes.

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01 Jul 2013 01:23 #36178 by malare
Replied by malare on topic Setup of a MPG for gantry
Have you had time to look into it?

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01 Jul 2013 07:07 #36181 by andypugh
Replied by andypugh on topic Setup of a MPG for gantry

Have you had time to look into it?


Yes, and no. I have had the time. But I forgot. I feel rather guilty now.

I have taken on a big chunk of work on re-coding how LinuxCNC handles tools. I expect to be busy with that for many months now.

Is my idea of using the encoder velocity to control a velocity-mode jog enough of a clue to get you started by yourself?
Look at the halui.jog.N.analog pins here:
www.linuxcnc.org/docs/html/man/man1/halui.1.html

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