Thc velocity low

paulsao
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22 Sep 2021 02:07 #221316 by paulsao

Replied by paulsao on topic Thc velocity low

This is the 9v battery test well it actually has 7.5v but according to the calculations it is ok? Those values

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snowgoer540
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22 Sep 2021 02:23 #221317 by snowgoer540

Replied by snowgoer540 on topic Thc velocity low

Check the battery with a multimeter and then verify the arc voltage displayed in plasmac matches

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paulsao
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22 Sep 2021 02:31 #221318 by paulsao

Replied by paulsao on topic Thc velocity low

The voltage of the battery is 7.6v and this is mi plasmac values and configure.

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snowgoer540
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22 Sep 2021 10:15 #221332 by snowgoer540

Replied by snowgoer540 on topic Thc velocity low

That would seem to be a problem then.

These two values in the config tab are what control that:

arc-voltage-offset=3728.125
arc-voltage-scale=0.008314

It would seem that you have not calculated them correctly, as a 7.6v battery should show 7.6v on the GUI.

You might try this calculator to help you: jscalc.io/calc/NTr5QDX6WgMThBVb

Otherwise we'd need more info about your setup.

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tommylight
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22 Sep 2021 12:14 #221337 by tommylight

Replied by tommylight on topic Thc velocity low

Another stab in the dark, but can you check what is the value of
plasmac.thc-feed-rate
pin?

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paulsao
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22 Sep 2021 13:52 #221343 by paulsao

Replied by paulsao on topic Thc velocity low

Thanks guys for your time, these are the values, actually the scale was fine since when I took out the wires from the plasma voltage I forgot to put the 1M resistor.

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snowgoer540
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22 Sep 2021 14:16 - 22 Sep 2021 14:45 #221344 by snowgoer540

Replied by snowgoer540 on topic Thc velocity low

Pretty sure you need to leave any scaling resistors in place when doing this test, and they need to be accounted for in the calculations for the calculations to be correct.

But I dont use a scaling resistor, and I've not done the math, so someone else will have to chime in and confirm.

Last edit: 22 Sep 2021 14:45 by snowgoer540.

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tommylight
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22 Sep 2021 14:19 #221345 by tommylight

Replied by tommylight on topic Thc velocity low

All looks good, thank you.
Not related to this but you might want to change the VAD threshold to 60-70%.

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paulsao
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22 Sep 2021 15:16 #221349 by paulsao

Replied by paulsao on topic Thc velocity low

It's a little better with the VAD change to 70, but I think I'm demanding too much for cutting at 1200mm / min and tilting the photo about 30 degrees is not fast enough to maintain height and ends up gluing the metal.

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PCW
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22 Sep 2021 16:03 - 22 Sep 2021 16:07 #221353 by PCW

Replied by PCW on topic Thc velocity low

What are your Z axis MAX_ACCELERATION and MAX_VELOCITY values?

Last edit: 22 Sep 2021 16:07 by PCW.

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Thc velocity low

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