Another plasma component...

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21 Apr 2019 01:09 #131354 by tommylight
Whatever you decide is good for me, mainly because i am not helping lately ( sorry about that ), and i can see pros and cons of both versions, but i am also leaning towards the one you chose.
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21 Apr 2019 03:38 #131367 by islander261
Phill

Thank you, I did successful line testing today. As usual nice cut quality from Plasmac, no surprises. The weather is supposed to be dry tomorrow so I will need to do yard work, no cutting. Hopefully Monday or Tuesday I will do a few production sheets when the weather is wet again.

My Gmoccapy using my complex PP and Gcode files resets the offsets at the end of every file so you always start in a known state when loading the next file without having to re initialize the machine.

John

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21 Apr 2019 04:19 #131369 by phillc54
I pushed another update:
- remove duplicated ini file entry - doesn't really affect anything, just a tidy up
- change resolution for arc voltage input scaling and offset
GUI files changed are:
configs/sim/axis/plasmac/native/plasmac_axis.py
configs/sim/axis/plasmac/gladevcp/plasmac_panel.py
configs/sim/gmoccapy/plasmac/plasmac_config.py
configs/sim/gmoccapy/plasmac/plasmac_panel.py


rodw wrote:
The on screen scaling does not work because of enforced upper and lower limits in the config screen as I can't enter an offset of 3659.375 (0-100 enforced)

Also the maths in my earlier post says the frequency counts per volt is 83.73 and you have to input the reciprocal of this which is 0.011943151 which is not logical. So I would recommend that the maths be changed to do the reciprocal stuff internally and also remove the enforced range on the scale. If that was the case I think it would work well with some explanation in the docs.

I have fixed the upper and lower limits, hopefully by enough to cover everything.
I don't want to change too much as I don't want the component itself to be dependent on any particular hardware.

I rigged up a 7i76e with a TCAD connected to the encoder input and two batteries for testing:
- run LinuxCNC
- open halshow and watch plasmac.arc-voltage-in and plasmac.arc-voltage-out
- set arc-voltage-scale to 1
- set arc-voltage-offset to the value read from plasmac.arc-voltage-in
- measure battery voltage
- connect battery to THCAD input
- set arc-voltage-scale to battery-voltage / plasmac.arc-voltage-out
could probably fine tune further but it was good enough for the purpose of the exercise.
My values were:
arc-voltage-offset = -3805
arc-voltage-scale = -0.000406

Cheers, Phill.
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21 Apr 2019 05:16 #131370 by rodw
Replied by rodw on topic Another plasma component...
Forgot mention, the only real issue was the ability to set the offset > 100
At 0 volts, with zero as an offset, I was getting 44 volts and 3659/83.73 = 43.7 volts so the logic was correct.
I'll update and give it a go when I'm next up in the shed.
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21 Apr 2019 05:53 #131372 by phillc54
Two more updates pushed:
- send z to near top after error
- clear offsets after job and probe test

these only affect the plasmac component so you need to run make

Cheers, Phill
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21 Apr 2019 11:42 #131386 by phillc54
John,

Before you cut any production sheets you may want to wait until I implement your idea of not enabling THC until at 99% of requested velocity after disabling due to cornerlock.
I will work on that tomorrow, I got a bit behind with all the probing problems.

Is there anything else I have forgotten?

Cheers, Phill.
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21 Apr 2019 13:29 #131392 by tommylight

phillc54 wrote: Is there anything else I have forgotten?

This was not directed at me, but i have to use the opportunity:
A two meter tall blonde ! :)

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21 Apr 2019 15:25 #131401 by islander261
Phill

Just to let you know two things I haven't tried to test yet are the Kerf Crossing and THC Autovolts. Both of these features are something that someone who cuts thicker than about 8mm may use. I do have one request, can the pierce height setting please be made tohave three digit resolution. This will be great for fine tuning pierce height.

John

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21 Apr 2019 23:02 - 21 Apr 2019 23:03 #131431 by phillc54

Just to let you know two things I haven't tried to test yet are the Kerf Crossing

I think my kerf crossing is too simplistic and I didn't think I would be able to sort it without a working table.

I do have one request, can the pierce height setting please be made to have three digit resolution. This will be great for fine tuning pierce height.

Would you like that for cut height as well?

A two meter tall blonde !

I can't find any spares of those...


Cheers, Phill.
Last edit: 21 Apr 2019 23:03 by phillc54.
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21 Apr 2019 23:42 #131433 by rodw
Replied by rodw on topic Another plasma component...

phillc54 wrote:

Just to let you know two things I haven't tried to test yet are the Kerf Crossing

I think my kerf crossing is too simplistic and I didn't think I would be able to sort it without a working table.


I have done some work on this. And have a working dv/dt component. I was going to watch it on halscope while cutting and pick a threshold to hold thc. never sure how to re-enable it either. But I kept forgetting to do the plots! Once I get going, I might have some ideas.
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