Advanced Search

Looking at the thc man page I don't see the pin or parameter spelled that way. I do see a parameter thc.voltage-tol float rw The deviation of Tip Voltage before correction takes place. Start your config and open up Show HAL Configuration. Look at the thc pins and thc parameters for correct spelling. I like to highlight the pin/parameter then press the middle mouse button to copy (it's the only way that works) then using the middle mouse button paste the pin/parameter name into my hal file. Also remember that any pyvcp pin must be in the postgui file as named in the [HAL] POSTGUI_HALFILE. See the hal section of the ini in the manual for more info.

I think I finally recovered from my vacation... I hope.

JT

John, thank you for your reply and help. I took the basis for these configuration files : git.linuxcnc.org/gitweb?p=linuxcnc.git;a...53913b1d5fce9905776a
and I think there are not any mistakes in it.
Regards. Andrew

Thanks for pointing me to the typo in the sample config. I see that line is commented out for some reason. I'll fix the sample config.

Edit: I think it is commented out because you can't set a parameter like you can a pin. I'll have to see...

JT

Hi.
Please hel me to configure plasma table with 3 axis in following port configuration (only 1 paralel port is used: 378)

Outputs:
X dir 2
X step 3
Y dir 4
Y step 5
Z dir 6
Z step 7
Enable motors: 1
Relay: 14

Inputs:
XYZ Homming 15 (I will use G28.1)
Probe: 15
THC On: 12
THC Up: 10
THC Down: 11
ESTOP 13

My linux knowledge is 0 so please help me.
Thank You

Use the Stepconf Wizard to generate you configuration. You will also need to know how many steps per user unit (inch or mm) and the step timings your drives like.

JT

I know how to config motors.
I don't know how to integrate THC signals in EMC

See this post

www.linuxcnc.org/index.php/english/forum...hc-up-down-simulator

JT

is there a way to modify THC300 configuration to work with one paralel port?

bdrotaru wrote:

is there a way to modify THC300 configuration to work with one paralel port?

I have no clue, the THC300 configuration is so complicated that only one person in the world AFAIK has made it work and that was the author. It really should not be part of LinuxCNC anymore... IMHO.

JT

It really should not be part of LinuxCNC anymore... IMHO.

I do agree!
Also some other stuff should go away ore be placed in the correct position.
There are several sim configs in the config folder, insteadt of being in config/sim

Tahnks for the files!

Norbert

Your welcome

JT

Hello Everyone,

We made a plasma cutting machine and now change the controll software to LinuxCNC.
It works good but I have some problem about THC.

I use Mesa 5i20 with Mesa THCAD 10V.
The plasma source is a Hypertherm Pmax 1650.

For the thc control I add the following parameters:
vel-tolerance: 5
volt-setting: 82 (from the user manual, finecut 40A, 3mm thickness steel, we measure it during cutting and it is good value)
volt-tolerance: 1

If I enable the THC the head is move only down and crashed into the plate.
I changed the presage of the thc.vel-scale to negative to look what happen and the head is rise up more than 100 mm from the plate.

I look in the show hall config - thc.zpos.in and it is very high value.

If I had disabled the THC the head was moved down. And after manuall moving the Z it is also make a correction move.

Have You got any idea what is wrong?

Thank You!

Regards,
Csaba

I would start by using hal watch to make sure the THC voltage is correct when the torch is working.
That is if the torch is cutting at 82 volts is the THC voltage in Hal also 82 volts?
This will confirm the voltage is read and the scale is correct.

Rick G

Ricks advice is good, check that the voltage is scaled correctly first.

One other thing missing that may or may not be important is that the encoder scale is never set.

It looks like you are assuming that encoder scale defaults to 1 and it may in fact have this default
but I dont see that specified anywhere in the hostmot2 documentation so I would set the encoder
position scale in the hal file.

Does the Hypertherm Pmax 1650 have different torch voltage divider settings, or are you using raw torch voltage and an external voltage divider?
The Mesa THCAD 10V expects a 0-10 volt input.

If all else is well and the voltage is incorrect the offset and scale of the voltage are set here in your plasma-5i20.hal

Rick G