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OK, so i fixed the following error thing, how do I fix the PWM problem?

rodw wrote:

Finally, ohmic sensing will only work  if the torch tip is shielded. You can't do it if the tip is exposed.
 

This is not true, you can do tip sensing as well. Take a look at example thermal dynamics A-series manual, they provide tip sensing :
 

PocketNC,

also like tommy said
"- several small companies for CNC with hugely changed GUI's and poised at keeping it a secret, found two on youtube but could not verify due to lack of any info."

ive seen a few like this also, cant verify, but the specs line up that its more likely linuxcnc,

Dedeer wrote:

And where i live Temperatures are as low as -10C in Winter.

Same here, mostly, can go down to -27 every 2-4 years and -37 twice in my lifetime ( i am old)
Last night one of my 3D printers panicked as it got under 0 in the shop, the shops are not isolated at all and have small open windows, no issue with cold ever, but lots of issue with moisture.

Yes plasma cutting is electrode negative so your will be positive.

The work is typically connected to mains ground at some point. Your normal industrial plasma will have a ground rod or some other way to ground the table. All grounds connect to this star ground. The plasma's themselves have the work tied to ground directly or through a resistor, if I remember correctly hyperhtem has a 100k resistor between PE and work, thermal dynamics and kjellberg have a direct connection. So you should assume these are at the same potential.

Sorry I did not check the sampling rate of the ADS1115, I just looked if the "same" chip came as 16-bit. Typically you dont need 1ms sample rate, higher rates would let you do digital filtering and some pretty fancy electrode wear estimation but this goes out of the scope of a typical height controller. I would not sped too much in this stuff on hobby stuff as its quite irrelevant. Sorry I bit of derailed the whole thing with the 16-bit, prob best to forget it for now.

The 2V you see while actually input should be 0, can also be noise from wires etc. Would not worry about it too much.

I don't know what you mean with the polarity thing. I made a sensing circuit for a friend a while back. Its just an opto with some protection, it feeds the ohmic 12V and triggers when it touches work. Its been used with a high def HF plasma.

- a china company for robots that put stuff on pallets (autocorrect complains about palletizing)
- very long time ago a Taiwan company running HDD assembly line
- several small companies for CNC with hugely changed GUI's and poised at keeping it a secret, found two on youtube but could not verify due to lack of any info.
Do retrofitted industrial machines count? We can add a lot there!
Oh and that German or Swiss company that did those very small lathes and mills, not sure they are still around, oh yeah, CoolCNC, they still have an ISO that is 50MB in size with LinuxCNC included!

Question should be
How to set a hotspot on Linux?
Any Linux distro that uses network manager = easy, it goe something like:
-right click on the network icon located up or down on the right side close to the clock
-choose "edit connections"
-double click on the wifi connection
-go to "Wi-Fi" tab
-select "hotspot" from the drop down menu and add info as neede like BSSID etc
-click save
-close
left click on network manager and select the wifi network to reconnect
done.

Its very weird, but I can travel over all the limit switches in X and Y and LNCN errors as I expect with on limit switch error, except for Z minus, where I get a joint2follower error.   By setting up to home at the Z max end, then I've run the Linuxcnc outline program, so the machine is otherwise working.
I've tuned the axis to as fine a limit as I can get, I've been through the hal and ini files but must be missing something.
Could I ask someone else to have a look in the files attached and see where I have made the mistake I must have. Or perhaps there is some other solution?

Thank you.
 

It makes sense to have it that way. However, in my Herocut 55i plasma cutter, the work lead or ground clamp is not automatically connected to mains ground.
And that also means that the plasma electrode is at -100 Volts or so. So when connecting it you have to be a little careful and not just assume that the electrode is the positive one because it is not. In this case. My machine has the polarity of the pins in the torch voltage connector well documented and is just a matter of following.
About ohmic sensing, that was my assumption too. A glimmer of hope was born when RDA mentioned it though.

Grotius wrote:

@Hi

There are now different solvers in the codebase, in c and c++.

Performance:
 

Test object:
 

that's a huge difference between the c/c++ but I imagine your using libraries for the c++ which are usually highly optimized for performance, but WOW. 

i am usine qtdragon_hd.

on my old setup
the michine will not run if the physical button is pressed.
but i coluld pres the software estop to kill the michine.

in the new build i can not press the software button. it is only a reflection of the physical button.

One Solution is to get a industrial second Hand PC. I have a Beckhoff which i use with my machine for about 4-5years now and Not a Single Problem. And where i live Temperatures are as low as -10C in Winter.

EDIT: with modern plasma machines without HF start, its not necessary for a seperate grounding stake

Was W1 position the issue?

Best practice per the Hypertherm docs is to have a star ground point on your machine.
www.hypertherm.com/Download?fileId=HYP103900&zip=False
Most plasma machines have a grounding point. It and the work lead should be connected to this star ground.
Also there shouldd be a seperate groound wire for every motor that leads back to the star ground. The purpose of this is to provide a path for EMI that is not going through all of your linear carriage bearings which adds to noise and damage.

Finally, ohmic sensing will only work  if the torch tip is shielded. You can't do it if the tip is exposed. This is because the electrode is shorted in the torch internally to the work piece until the arc is initiated at which time it blows back by air to  clear the short.

Who said plasma was easy?