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Author Topic: M3 and M5 for plasma on off execute early  (Read 2096 times)

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M3 and M5 for plasma on off execute early
« on: August 05, 2020, 01:28:58 PM »
Hi all,
         I have mach3 with a NVEM motion control on a home built plasma table.
motion is good and calibrated.
single stepping works but when I run G code the M3  plasma start  command executes before the previous move finishes, stopping before end of cut.
If I  then rapid to another cut the plasma restarts during the rapid.
stepping the code runs as expected.
I get the same problem with any G code source it seems.
The start and stop are shown on the toolpath in the incorrect places also.
I get the same result with moving the torch signal to he flood output and editing the Gcode M3 M5 to M8 and M9
It is not plasma noise I get the same result with a lamp on the plasma drive.

Has anyone experienced this or got a solution please.

Regards

Bob

Offline Tweakie.CNC

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Re: M3 and M5 for plasma on off execute early
« Reply #1 on: August 06, 2020, 01:05:17 AM »
Hi Bob,

Unfortunately Novusun products are not supported. This thread refers; https://www.machsupport.com/forum/index.php?topic=24331.0

Tweakie.
PEACE
Re: M3 and M5 for plasma on off execute early
« Reply #2 on: August 06, 2020, 06:00:15 AM »
Hi Tweakie,
                  Thanks for the prompt  reply.

Can you recommend a better controller, this is my first build, everything else is good.

Regards

Bob

Offline Tweakie.CNC

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Re: M3 and M5 for plasma on off execute early
« Reply #3 on: August 06, 2020, 06:24:44 AM »
Hi Bob,

Any of the US or EU manufactured controllers are good.
The Warp9 ESS is a good all-rounder and has plasma capability. Check out their website and forum for more details.
 https://warp9td.com/

Tweakie.
PEACE
Re: M3 and M5 for plasma on off execute early
« Reply #4 on: August 06, 2020, 06:47:22 PM »
Thanks Tweakie,
                         looks like I backed a bad deal.
I  am a retired university engineer with a technical background initially.
so I built the table which works as expected.
no plasma start problems, I hope I knew how to deal with that.
I am a bit worried if I dump the existing setup I will still see the switching problem where the M3 turns the plasma on before the last move rapid ends and off before the cut move ends.
If I buy the controller you suggest and mach4 will this resolve the timing problems.
If I may ask  question the Mach3 core appears to run through an interpreter why is it not compiled.

Thanks again for your reply.

I am away for over a week so cannot respond until then.

Regards

Bob

Offline Tweakie.CNC

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Re: M3 and M5 for plasma on off execute early
« Reply #5 on: August 07, 2020, 01:07:53 AM »
Quote
If I buy the controller you suggest and mach4 will this resolve the timing problems.

Unfortunately I do not have a plasma set-up to test so cannot answer your question with any certainty. Perhaps reading and asking questions on the Warp9 forum would be the way forward.

Tweakie.
PEACE

Offline Graham Waterworth

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Re: M3 and M5 for plasma on off execute early
« Reply #6 on: August 13, 2020, 08:50:52 PM »
You could try changing to exact stop mode before the torch start/stop commands, thus forcing the last move to end before the M command.  Just make sure the M is on a line of its own.
Without engineers the world stops
Re: M3 and M5 for plasma on off execute early
« Reply #7 on: August 17, 2020, 09:37:09 AM »
Thanks Graham,
                       For taking time to reply.
That is exactly what I need, the previous move instruction to complete before the m3 or m5 executes.
 I dont know what excact stop mode is or how to implement it.
I will look it up and will give that a try.

Regards

Bob

Offline Graham Waterworth

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Re: M3 and M5 for plasma on off execute early
« Reply #8 on: August 17, 2020, 09:51:51 AM »
Check out G61 exact stop mode, finish last move before next command, no blending and G64 constant velocity mode normal profiling mode with blending of moves.
Without engineers the world stops
Re: M3 and M5 for plasma on off execute early
« Reply #9 on: August 17, 2020, 04:13:54 PM »
Thanks Graham,
                        I will do. To save loosing my investment so far I am considering either an external solution with a microcontroller  looking at the stepper pulses and waiting for the end of current move before starting then holding the arc on until the cutting  move ends.
I prefer your programming solution if I can make it work.
other option is to start again with perhaps 3D printer software and controller, which I have experience of.

Regards

Bob