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Height Override

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27 Jan 2021 05:55 #196701 by phillc54
Height Override was created by phillc54
I was made aware today that each increment/decrement of the torch height override is a 0.1V change of the target voltage. This equates to approximately 0.01mm (0.0004"). I have never had the need to use this feature and I am not sure whether that is too fine a control. Would it be better at 1V per increment/decrement giving a change of approximately 0.1mm (0.004")

Also at the moment the initial height change distance is hard coded and then adjusted by THC. If I need to change the above then I could use the height per volt setting for this as well.

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27 Jan 2021 08:21 - 27 Jan 2021 08:22 #196711 by rodw
Replied by rodw on topic Height Override
I have only used this once. In previous versions there was a pretty massive drop down you could choose from so it was a lot quicker to adjust than a spin box.

I might have misunderstood you but...
I think that approach may become confusing and a seperate parameter should be used. The reason for this is that if you drop in on the Plasma Primer linuxcnc.org/docs/devel/html/plasma/plas...mer.html#_cnc_plasma

and review the graph of 16000 readings and take the inverse of the volts per mm to convert to height per volt, the data showed that the height per volt for that machine was measured at 0.753 volts per mm with 99.4% confidence.
So a masochistic user may repeat my experiment and come up with a similar value.
Seeing a number change by such an odd increment (if I got your thinking right) would confuse the user.
I think it would be less confusing if the increment could be set as a more natural value (maybe chose the increment from something like 0.10, 0.20, 0.25,0.50,1.0)
Last edit: 27 Jan 2021 08:22 by rodw.

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27 Jan 2021 08:31 #196713 by phillc54
Replied by phillc54 on topic Height Override
What I am asking is whether the existing 0.1V change is too small to be practical or should it be 1V

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27 Jan 2021 09:07 #196716 by tommylight
Replied by tommylight on topic Height Override

What I am asking is whether the existing 0.1V change is too small to be practical or should it be 1V

Yes.
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27 Jan 2021 09:19 #196717 by rodw
Replied by rodw on topic Height Override

What I am asking is whether the existing 0.1V change is too small to be practical or should it be 1V


Yeh I know now. They taught me that responsibility for a receiver understanding a message lies with the sender and I initially got confused. :silly:

I did have a look at the gui.....

I think 1V may be too coarse when you see cut heights like 1.75mm hence my suggestion of allowing a user config of this value by allowing selection of the increment from a defined list so the display rounded up or down neatly.

(maybe chose the increment from something like 0.10, 0.20, 0.25,0.50,1.0)


eg. to go from 1.75 mm to 1.8mm needs a 0.5 volt increment by your rule of thumb,

Is the spinbox is the right method to alter the variable?

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27 Jan 2021 09:31 #196720 by phillc54
Replied by phillc54 on topic Height Override
Maybe just set it to whatever the THC Threshold is, it won't keep to a height better than that anyhow. The default is 1.
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27 Jan 2021 10:04 #196724 by rodw
Replied by rodw on topic Height Override

Maybe just set it to whatever the THC Threshold is, it won't keep to a height better than that anyhow. The default is 1.


Can you define what THC Threshold does? seems to be MIA in the docs.

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27 Jan 2021 10:09 #196725 by phillc54
Replied by phillc54 on topic Height Override

Can you define what THC Threshold does? seems to be MIA in the docs.

linuxcnc.org/docs/devel/html/plasma/plas...e.html#_config_panel

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27 Jan 2021 10:16 #196727 by rodw
Replied by rodw on topic Height Override
Ahh, I searched for the literal "THC Threshold" not for threshold...

Sounds logical.. as long as its documented :)

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27 Jan 2021 10:20 #196729 by phillc54
Replied by phillc54 on topic Height Override

Ahh, I searched for the literal "THC Threshold" not for threshold...

Sounds logical.. as long as its documented :)

I'll send a memo to the publishing house after it is done. :laugh:
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