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  • rodw
  • rodw's Avatar
18 Aug 2026 09:39
Replied by rodw on topic THC doesent work when G code is running

THC doesent work when G code is running

Category: Plasmac

voltages sound about right. Nice to know ethercat is so simple to install for plasma machines.

I'm a bit rusty, it can be a bit cantankerous  on non standard setups, Check the thc is not disabled in the gcode which sounds a likely place to look
  • rodw
  • rodw's Avatar
18 Aug 2026 09:26
Replied by rodw on topic Unlimited custom outputs?

Unlimited custom outputs?

Category: General LinuxCNC Questions

You could use ethercat. Start with a EK1100 coupler
www.beckhoff.com/en-en/products/i-o/ethe...-coupler/ek1100.html
and then add 32 output EL2407 modules as required.
www.beckhoff.com/en-en/products/i-o/ethe...l-output/el2407.html
6 would give you 192 outputs and an  EL2008 rounds it off to exactly 200 inputs.
the EK1100 can supply for 2 amps but the power bus is can handle 10 amps. If you need more power you can insert a EL9410 power supply module between modules on the bus.
www.beckhoff.com/en-au/products/i-o/ethe...x-system/el9410.html

 
  • GFC
  • GFC
18 Aug 2026 08:46 - 18 Aug 2026 08:59
Replied by GFC on topic THC doesent work when G code is running

THC doesent work when G code is running

Category: Plasmac

Im using a beckhoff 3102 +-10v analog input so im dividing the arc voltage 30:1 inside the powermax 65, and after the first tests with a bench power supply I realized that the beckhoff module outputs a float value between -1 and +1, given the range I assumed it relates the voltage and the float output value 10:1, so in qtplasmac i combined the two ratios to be 300:1 the cut voltage appears to display right in the tests i have done so far, 200 something volts at ark start and stabilizing at about 130V and that agrees with hyperterm's tables for the parameters im using

edit:
and as I said before thc is working fine when doing a manual cut with the jog keys
 
  • rodw
  • rodw's Avatar
18 Aug 2026 08:19
Replied by rodw on topic THC doesent work when G code is running

THC doesent work when G code is running

Category: Plasmac

There is 
net plasmac:arc-voltage-in <=  lcec.0.3.ain-0-val
so the voltage is provided by an ethercat analog input
and I see the GUI settings of
Arc Voltage Offset = 0.0
Arc Voltage Scale = 300.0

How do you scale the input back to volts?
Do you see a Voltage being displayed?
What I'm seeing is you are multiplying the input value by 300 which does not sound right. 
I would have thought you would be using the voltage divider factor from your plasma cutter. eg if 20:1 you'd multiply by 20.
The other approach would be to scale the voltage outside of QTplasmac and use a scale of 1 which I have used before.
Need to get your voltage correct before looking at thc
  • rodw
  • rodw's Avatar
18 Aug 2026 08:04
Replied by rodw on topic Conversational CAD CAM

Conversational CAD CAM

Category: O Codes (subroutines) and NGCGUI

I am not moving to USA !!! :) It has become unbearable, even on TV !
Sorry for hijacking the topic.

If you can't bear the US, don't come to Australia!
My son is in Texas after a stint in Europe and I quite sure he'll never come back home! 
  • Halbear
  • Halbear
18 Aug 2026 07:50
QTDragon 5-axis trt was created by Halbear

QTDragon 5-axis trt

Category: Qtvcp

Hi all,

It's been quite a while since I was here last..

A year or two ago I installed and configured the 5-axis version of QTDragon (the one that has jog buttons for A and C axes as well), but I can't for the life of me remember where I got it from   

I found Jim's profile but it seems I can't message him from here.

Help appreciated!
  • emresensoy
  • emresensoy
18 Aug 2026 04:08 - 18 Aug 2026 04:09
Replied by emresensoy on topic DIY Robot Kinematic parameters,

DIY Robot Kinematic parameters,

Category: Advanced Configuration

I made a simulation html with claude
  • PCW
  • PCW's Avatar
18 Aug 2026 01:29
Replied by PCW on topic Unlimited custom outputs?

Unlimited custom outputs?

Category: General LinuxCNC Questions

If you want a lot of TTL level (open drainn) outputs, a 7I90HD in sserial remote mode
will provide 72 outputs (or inputs) per card.
  • tommylight
  • tommylight's Avatar
18 Aug 2026 00:44
Replied by tommylight on topic THC doesent work when G code is running

THC doesent work when G code is running

Category: Plasmac

I don't see anything in the hal  files that reference the THC or plasma voltage or
source for plasma voltage information at all.

+1
  • tommylight
  • tommylight's Avatar
18 Aug 2026 00:42
Replied by tommylight on topic Unlimited custom outputs?

Unlimited custom outputs?

Category: General LinuxCNC Questions

Do you need to activate them from gcode or from GUI?
Why 7i73? See 7i71 or 7i72 at 48 outputs each.
Not much info to go on, but yes LinuxCNC should have no problems controlling "as many as you can wire in" outputs, granted the hardware is there.
But that will also depend of the first question.
  • sticky
  • sticky
17 Aug 2026 23:34
Unlimited custom outputs? was created by sticky

Unlimited custom outputs?

Category: General LinuxCNC Questions

I need to setup a machine that will require 200 custom outputs.  I was looking at using Mesa cards since I am familiar with them and they will allow me to control that many outputs using a 7i74 and a bunch of 7i73 cards.  Will LinuxCNC allow that many custom commands?  If so, how would I approach this? I am familiar with the M100-M199 User Defined Commands, is there a way to add more beyond M199?
  • PCW
  • PCW's Avatar
17 Aug 2026 22:06
Replied by PCW on topic THC doesent work when G code is running

THC doesent work when G code is running

Category: Plasmac

I don't see anything in the hal  files that reference the THC or plasma voltage or
source for plasma voltage information at all.
  • tuxcnc
  • tuxcnc
17 Aug 2026 20:09 - 17 Aug 2026 20:12
Replied by tuxcnc on topic Ncam and Lathemacros conflict

Ncam and Lathemacros conflict

Category: CAD CAM

I see no one is interested... But I did it for myself, so I'll share it.
I decided to change github.com/andypugh/LatheMacros/tree/Py3_GTK3 because it contains errors and is dangerous.
In short, the author used the modal codes g95 and g96, which is fine, but he did not cancel them at the end of the subroutine.
After completing the cycle, LinuxCNC remains with active G95 and G96 codes, and believe me, 100 mm/min and 100 mm/rev are not the same and making a move in MDI, for example, may end in a disaster.
Since the archive contains a very large LatheMacro.svg file and I wanted to keep everything as a whole, I had to cut the tbz archive into smaller pieces so that I could post them here as attachments.
You cannot unpack these files normally, you have to do it like this:
cat LatheMacros-Py3_GTK3_renamed.a* | tar xzvf -

File Attachment:

File Name: LatheMacro...d.aa.tgz
File Size:1,500 KB

File Attachment:

File Name: LatheMacro...d.ab.tgz
File Size:1,500 KB

File Attachment:

File Name: LatheMacro...d.ac.tgz
File Size:495 KB
  • muddiver
  • muddiver
17 Aug 2026 18:39

Help needed for conversion of old ( and loved ) Mach3 MPG

Category: Basic Configuration

I do not really understand why,
but when i load the usb-mpg via Vendorkey+Productkey and -K option, all works fine.

Any disadvantages loading the keyboard via vendor/productkey and not via name?

Greets, Tom
  • WMCVegas
  • WMCVegas
17 Aug 2026 18:08
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