Sheetcam and trying to generate spotting gcode.

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04 May 2021 23:45 #207907 by rodw

looks like that will work. I posted on the sheetcam forum, since I believe that the issue shown above is still a bug. Not completing the operation before changing the setup is just wrong.


I don't think its a bug. Expected use is to use spotting on a seperate layer with a drill operation. This then locates the centre of the hole. You can't locate the hole centre on a jet operation.
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05 May 2021 01:03 #207920 by phillc54

I don't think its a bug. Expected use is to use spotting on a seperate layer with a drill operation. This then locates the centre of the hole. You can't locate the hole centre on a jet operation.


That is exactly how I have used it for a long time...

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05 May 2021 07:54 #207939 by phillc54
I did some work on the temporay materials and have a test branch if anyone wants to give it a try.

github.com/phillc54/linuxcnc/tree/phillc54/temp_materials

This was tested with the gcode that Rod posted on this thread so it should work with the PP that Les posted on this thread.

It allows any number of temporary materials so in theory you could have an empty <machine_name>_materials.cfg file and just use the temporary materials from gcode.

The only changes from a user perspective are that you can add a material name to a temporary file with the "na=" option. If you mix and match adding materials, editing materials, and temporary materials then all temporary materials must appear after any add/edit materials.

It uses material numbers starting at 1000000 so hopefully it won't conflict with materials in the <machine_name>_materials.cfg file.

The material change for temporary materials is also handled by QtPlasmaC and should not be in the gcode file.
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19 May 2021 15:44 #209522 by robertspark


File Attachment:

File Name: plasmac_20...4-28.zip
File Size:3 KB


forum.linuxcnc.org/plasmac/42374-sheetca...code?start=40#207300


I think there is a bug in the Sheetcam Plasmac Postprocessor done by Les in this link (I believe / it appears to be the latest)

post.NonModalNumber(", fr=", GetFeedRate() * scale, precision)

fr is coming out as "100", despite me setting it at "4800"

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30 May 2021 16:07 #210688 by snowgoer540
Got a chance to dabble with Les' post today, as I am working on a job that I wanted to give spotting a go for.

I really liked that Phill's post chopped each cut into sections. It also showed the length of each cut at the beginning of the cut section.

Also, at the end in the statistics, it showed the total cut length.

Is it possible to add these to the SheetCAM maintained post? I used the first one (being in sections) to easily get back to points where the process failed, or to only cut certain sections later. I used the second to quote jobs.

I can add them myself, but I figured I'd ask here in case anyone else used them as well.

Also, when I make changes to a SheetCAM generated post, will my edits be wiped out when I update SheetCAM if there is an update to the post I use?

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10 Aug 2021 15:41 - 10 Aug 2021 15:42 #217407 by LesNewell
Sorry for the late reply but better late than never I suppose.
I can add more information if enough people want it.
snowgoer540, if you edit a post your edited version is kept in SheetCam's settings directory. Updates will not overwrite it. If the post name is shown in the post list with (edited) at the end of the name, it is in your settings directory.

Roberspark, I can't replicate your feed rate issue. Just a thought - are you changing the tool's feed rate? The post uses the operation's feed rate which may not be the same as the tool feed rate.
Last edit: 10 Aug 2021 15:42 by LesNewell.
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