Homemade, cheap, plasma CNC

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18 Jul 2021 09:47 #215215 by RNJFAB
Replied by RNJFAB on topic Homemade, cheap, plasma CNC
Hey Phill,
I'll have to grab it off the CNC computer tomorrow.

I'm setup so I draw and convert with sheet cam on one computer, then usb transfer to cnc computer to cut.

I have sheet cam on the cnc computer but my tool list doesn't work and it is glitchy so I do this on the other computer first.

I am running the spaceship post processor from Rod.

On pierce and cut everything works fine.

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18 Jul 2021 10:13 #215218 by phillc54
No worries, I wouldn't be able to do much tonight anyhow.

I am not sure about Rod's PP, I havent used it at all. We did have a PP here but some folk complained about the the workflow for doing spotting so SheetCam made their own which is packaged with the software. I then removed ours so we had one less thing to support. I haven't used the SheetCam one but I think Rod has, I still use our old one.

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18 Jul 2021 21:32 #215260 by rodw
Replied by rodw on topic Homemade, cheap, plasma CNC
I wouldn't use my post processor any more. I was using Phills for along time. I have used the Sheetcam one and it works too!
More recently Sheetcams post processor can be set to use the "magic" comments which then allows  Sheetcam to be the master of settings so there is no longer any inconsistencies between Sheetcam and Plasmac. I think this is a good thing. There should only be a single point of truth and Sheetcam assumes it is that source. But Plasmac assumes the same too!

Its always a good idea to  view a new postprocessor in a text editor as there can be some settings you can change in it. 

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18 Jul 2021 23:21 #215263 by tommylight
A guide of the whole process from opening a dxf in sheetcam to saving it for PlasmaC would be nice - nesting included, if it mentions at the very beginning how to install/use/open/import the material and post, i swear i would not complain! :)
 

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19 Jul 2021 00:51 #215277 by phillc54

There should only be a single point of truth and Sheetcam assumes it is that source. But Plasmac assumes the same too!

Not everyone uses SheetCam...

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19 Jul 2021 07:38 #215290 by rodw
Replied by rodw on topic Homemade, cheap, plasma CNC

There should only be a single point of truth and Sheetcam assumes it is that source. But Plasmac assumes the same too!
Not everyone uses SheetCam...

Of course, thats understood.  The Sheetcam paradigm is  a lot older than Plasmac's so its good it can be used as it was intended. So thanks for adding the enabling feature...

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19 Jul 2021 12:17 #215317 by RNJFAB
Replied by RNJFAB on topic Homemade, cheap, plasma CNC
 

Which one do you recommend?
Attachments:

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19 Jul 2021 12:19 #215318 by rodw
Replied by rodw on topic Homemade, cheap, plasma CNC
one below your cursor
The following user(s) said Thank You: RNJFAB

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02 Aug 2021 12:03 #216690 by RNJFAB
Replied by RNJFAB on topic Homemade, cheap, plasma CNC
Thanks Phil,

I tried this tonight finally, unfortunately my code knowledge is limited to basic arduino.

The cnc computer isn't on the net so i'll just type in below what i have tried. spoiler alert, it didn't work.

HAL file

# external output signals

# - - - LASER - - -
net laser <= hm2_7i96.0.ssr.00.out-01

INI file
BUTTON_2_NAME = LASER
BUTTON_2_CODE =laser

This doesn't work and I get the following error
"Unknown word starting with a (big red circle with white X in it)"

Any guidance on how to make it work would be greatly appreciated.

Cheers

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02 Aug 2021 13:01 - 02 Aug 2021 13:03 #216692 by snowgoer540
A few things probably to get you there...

1. In the ini file, the BUTTON_2 lines are not necessary, as there is a LASER button that does this all by default. The button is not shown by default unless you specify a laser offset in the .ini file. You need to add the offset line in the [QTPLASMAC] section of the .ini file:
LASER_TOUCHOFF = Xoffset Yoffset


Where "offset" is the distance from the centerline of the torch to the laser's cross hairs.

2. The output pin needs to be netted to qtplasmac.laser_on in the .hal file, like this:
# - - - LASER - - -
net laser qtplasmac.laser_on <= hm2_7i96.0.ssr.00.out-01


Unsure how old your config is, but if you used pncconf recently, you may be able to go back in and specify a laser offset, as well as pick a pin for the laser output, which should do everything I mentioned above automagically.

3. A better explanation of what I just typed, as well as a detailed explanation of how to use the LASER button is covered here: linuxcnc.org/docs/devel/html/plasma/qtplasmac.html#qt_laser

Let us know if you have any questions.
Last edit: 02 Aug 2021 13:03 by snowgoer540.

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