Homemade CNC Plasma - hypertherm, Mesa, gear drives, nema 34.
- PCW
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22 Jun 2026 23:29 #347248
by PCW
Replied by PCW on topic Homemade CNC Plasma - hypertherm, Mesa, gear drives, nema 34.
Does sound like an EMI issue.
Have you tried debouncing the limit switch signals?
( This can be done with the hal debounce component or with some
hardware, a hal parameter )
Have you tried debouncing the limit switch signals?
( This can be done with the hal debounce component or with some
hardware, a hal parameter )
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- tommylight
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23 Jun 2026 00:07 #347249
by tommylight
And you will have to find a DVM with memory or use a scope to check the mains voltage when the plasma triggers.
Replied by tommylight on topic Homemade CNC Plasma - hypertherm, Mesa, gear drives, nema 34.
Strange, there is always, always some small readings of a few Volts, so i would venture a guess at measuring at the wrong places, although there are no right places, but still, one lead from DVM to electronic/control ground or zero, be it Mesa board and/or power supply "negative" side, the other on grounds on power supply, case if metal, wire shield, etc.Couldn't find any spots showing voltage.
And you will have to find a DVM with memory or use a scope to check the mains voltage when the plasma triggers.
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- rodw
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23 Jun 2026 07:48 #347258
by rodw
I probably wouldn't add a max limit signal if I was sharing a single home/limit switch but I don't think that will make any difference. Are you using proximity sensors or switches? normally open or closed? if prox sensors, are they pnp or npn?
Replied by rodw on topic Homemade CNC Plasma - hypertherm, Mesa, gear drives, nema 34.
This seems the most likely problem and a simple solution. I did go through your Hal and ini files shared earlier and could not see anything obvious wrong.Does sound like an EMI issue.
Have you tried debouncing the limit switch signals?
( This can be done with the hal debounce component or with some
hardware, a hal parameter )
I probably wouldn't add a max limit signal if I was sharing a single home/limit switch but I don't think that will make any difference. Are you using proximity sensors or switches? normally open or closed? if prox sensors, are they pnp or npn?
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23 Jun 2026 11:07 #347263
by RNJFAB
Replied by RNJFAB on topic Homemade CNC Plasma - hypertherm, Mesa, gear drives, nema 34.
I'll get the EMI power line filter tomorrow and hopefully have it all back up and running over the weekend. Will also go over all the grounding wires to make sure nothing has come off (what i'm thinking as this has slowly crept in).
Thanks for all your support and ideas to get me back on track.
Thanks for all your support and ideas to get me back on track.
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