plasmac cutting holes

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18 May 2021 08:34 #209316 by robertspark
I am wondering if there is scope for a better mouse trap at cutting holes?

I am converting a macro I have created for holes,. but was wondering if it was possible to add a parameter to the plasmac material file for hole factor (hf) which would be a number from 0-1 and accounts for trailing and leading kerf crossing. (is there a way to add fields and retrieve custom fields from the material file??)

it is very similar to hypertherm true hole, using an arc for a leadin

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18 May 2021 10:33 #209327 by rodw
Replied by rodw on topic plasmac cutting holes
You probably could modify the python data structure quite easilly to add a couple more fields. Personally I think its the wrong way to go. Some enhancements to state tags could build hole processing to new heights that is superior to the gcode based methods Hypertherm use. Let LCNC fully automate it in real time....

I think also you need to be confident of the Plasmac kerf crossing algorithm. Not many people have played with it. It would be very useful for hole cutting to catch a dive on a falling slug. But not many people cut thick material where this is really required.

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18 May 2021 10:51 #209331 by robertspark
Replied by robertspark on topic plasmac cutting holes
just doing it by math, no interest in anything else thanks

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18 May 2021 11:10 #209335 by rodw
Replied by rodw on topic plasmac cutting holes

just doing it by math, no interest in anything else thanks

Yeh I know. Everybody is quite comfy with plsmac now and nobody is really trying to break new ground.

But if you go the safe way, looks like you would start here (well in this file somewhere) But Phill would be able to add guidance.
github.com/LinuxCNC/linuxcnc/blob/master...c/plasmac_run.py#L99

Also look at how he does conditional handling in the materials file for the rs485 code. I think its turned on in the config or ini file somewhere
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18 May 2021 11:20 #209337 by robertspark
Replied by robertspark on topic plasmac cutting holes
thanks very much.

thats the problem when you have a mouse trap that works.... whats the point in a better mouse trap..... I'm sure at some point everyone was fairly content with model T fords .... till the model A came along and sold 4.8million ~ 3 years..... (the model T sold ~15 million in 18 years).

A bit like cnc... first you are just happy to cut something / anything... then you wonder if there is a better finish to be gained , etc etc
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18 May 2021 12:10 #209343 by rodw
Replied by rodw on topic plasmac cutting holes
But now some cars are self driving or have collision avoidance because people built better mousetraps...

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18 May 2021 23:29 #209423 by phillc54
Replied by phillc54 on topic plasmac cutting holes

I am wondering if there is scope for a better mouse trap at cutting holes?

I am converting a macro I have created for holes,. but was wondering if it was possible to add a parameter to the plasmac material file for hole factor (hf) which would be a number from 0-1 and accounts for trailing and leading kerf crossing. (is there a way to add fields and retrieve custom fields from the material file??)

Sorry, there is no way to add/read custom parameters without hacking the code.

I am not really understanding what you want to do, do any of these hole codes help at all?

linuxcnc.org/docs/devel/html/plasma/plas...de.html#hole-cutting

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19 May 2021 15:20 - 19 May 2021 15:25 #209519 by robertspark
Replied by robertspark on topic plasmac cutting holes

Sorry, there is no way to add/read custom parameters without hacking the code.


No problem Phil, I understand, there is no way to satisfy everyones needs, I may just pass the parameters via m-code 100-199 P or Q parameters (exc. M190 obviously).

I have an algorithm to stop the torch as the leading kerf crosses the trailing kerf, and with PlasmaC that is obviously possible via M62 P3.

I also like an arc for a leadin given it allows for a smoother transition (IMO, YMMV, each to their own), between the leadin and the cut and the lead out and allows for smoother acceleration / less jolt and jerk, especially on thinner materials (2mm / 14g / 0.080")



www.hypertherm.com/learn/about-our-produ...y2/plasma/true-hole/

Th following are some small holes for me to try on 2mm mild steel (~16g) at 2.5t which is sort of the limit of air plasma

File Attachment:

File Name: BoltholeSi...mmOD.txt
File Size:1 KB


File Attachment:

File Name: BoltholeSi...stop.txt
File Size:1 KB


File Attachment:

File Name: BoltholeSi...top2.txt
File Size:1 KB

Attachments:
Last edit: 19 May 2021 15:25 by robertspark.

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19 May 2021 15:33 #209520 by AgentWD40
Replied by AgentWD40 on topic plasmac cutting holes
I'm just curious, per the hypertherm video are you adjusting the current on the fly or using O2?

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19 May 2021 15:49 #209523 by robertspark
Replied by robertspark on topic plasmac cutting holes
I wont be using O2, I will be adjusting the amperage at some point though (just probably not for a little while).

those posts were created in sheetcam using a couple of dxf's, although I have an equation to do it too.

It seems that there is a bug in the sheetcam post processor that Les posted in this thread in that it lists the feedrate (fr) as 100 and not 4800.
forum.linuxcnc.org/plasmac/42374-sheetca...code?start=40#207300

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