Homemade, cheap, plasma CNC

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06 Jan 2022 22:58 #230994 by snowgoer540

That is how I run my table, I only do garden art stuff on a limited size of thicknesses so kerf width doesn't bother me at all.


Agreed, for most stuff it's easy to just set the kerf width to 0 and let er eat, then you can pick any material to cut it out of you please.

It is air plasma after all :)

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06 Jan 2022 23:06 #230995 by phillc54
I did a cut with a finecut tip and then a cut with a general purpose tip on a mid range thickness material and averaged the kerf width and that is my SheetCAM tool zero kerfwidth. Tool zero is the only tool I need in SheetCAM then.

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06 Jan 2022 23:07 #230996 by snowgoer540

I did a cut with a finecut tip and then a cut with a general purpose tip on a mid range thickness material and averaged the kerf width and that is my SheetCAM tool zero kerfwidth. Tool zero is the only tool I need in SheetCAM then.

That's a much better idea than just setting the KW to 0.00.  I like it.

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07 Jan 2022 01:57 - 07 Jan 2022 02:29 #231005 by RNJFAB
Replied by RNJFAB on topic Homemade, cheap, plasma CNC

Try this button code, it ought to do what you're after (at least it did in a sim here :) ):

BUTTON_7_NAME = ZERO ON\GREEN
BUTTON_7_CODE = G10 L20 P0 X69.533 Y-9.724 \ G0 X0 Y0
BUTTON_8_NAME = ZERO ON\RED
BUTTON_8_CODE = G10 L20 P0 X58.064 Y-25.190 \ G0 X0 Y0


Without seeing your g-code, assuming you're using the sheetcam post, if you remove these two lines from your g-code, you should be able to run whatever material is selected in the drop down above the graphics preview window:

(note that the lines may not be exactly this, and that XXX is the material number)

m190pXXX
m66p3l3q2


That ought to do it, but be sure to report back!


Thanks Snow.
[attachment=42735"]zeroonlasersometimes.png[/attachment]
Feedback = works great.... most of the time. Initially it worked, then i loaded another file and re-zeroed and this happened.

Note the torch didn't go all the way to zero.


However, I was able to push my 'GO TO ZERO' button and it moved to the correct spot.


Yes, using sheetcam. I didn't realise that you were editing each code after setting it up. I have done this and it works a treat. Ovbiously it wont work for everthing, however it will be handy for some parts I just cut from scrap, now i can use whatever material I have. Cheers
Attachments:
Last edit: 07 Jan 2022 02:29 by tommylight. Reason: Trying to fix the post

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07 Jan 2022 02:02 #231006 by snowgoer540
The editor is abhorrent here.  But The pics
did work at one point so I saw what you mean.

may be an issue in our end, I/we will get back to you.

I don’t know what you mean that you didn’t know I was editing each code after setting it up?

but you could edit the post processor to not include the two lines if you’d like.

my work flow is different, but there are many ways to skin the proverbial cat :)
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07 Jan 2022 02:15 #231007 by RNJFAB
Replied by RNJFAB on topic Homemade, cheap, plasma CNC
   
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07 Jan 2022 02:24 #231009 by RNJFAB
Replied by RNJFAB on topic Homemade, cheap, plasma CNC

The editor is abhorrent here.  But The pics
did work at one point so I saw what you mean.

may be an issue in our end, I/we will get back to you.

I don’t know what you mean that you didn’t know I was editing each code after setting it up?

but you could edit the post processor to not include the two lines if you’d like.

my work flow is different, but there are many ways to skin the proverbial cat :)
 

Thank You.

I think the editing was me. sorry.

With the G Code, I thought you may have had it set in the PP. However I didn't realise about the kerf compensation that would be affected. It's all good, by editing the G Codes I need to in QtPlasmac I can now cut the same bits from a range of materials.

I am still tweeking settings as I go so there will still be a lot of adjusting for my materials in sheetcam. Currently working through hole cutting, for 5mm - I draw a 13mm hole, but cut a 12.4mm hole. For 3mm - I draw a 11mm hole, but cut a 10.4mm hole. So still a little bit of work to do with my kerf with and probably cut height. Or about 1/32 out at the moment.

 

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07 Jan 2022 02:25 - 07 Jan 2022 02:31 #231010 by tommylight
i think i fixed the above post by RNJFAB, still one picture does not show.
Last edit: 07 Jan 2022 02:31 by tommylight. Reason: Trying to fix the post by RNJFAB
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07 Jan 2022 14:38 #231029 by snowgoer540
I do see in the code what causes your G0 X0 Y0 to not finish its move, a fix will be upcoming. I'll try to remember to drop a line here to let you know when to update.
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07 Jan 2022 20:52 #231058 by RNJFAB
Replied by RNJFAB on topic Homemade, cheap, plasma CNC
Thanks Snow,

I kinda feel like the problem child at the moment. Everything I do seams to break linux, like I’m not using it right. 

you guys have done an amazing job to create such an incredible program! I only wish I had have found it sooner. 

I do see in the code what causes your G0 X0 Y0 to not finish its move, a fix will be upcoming. I'll try to remember to drop a line here to let you know when to update.

 

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