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In this comment in another thread -> www.linuxcnc.org/index.php/english/compo...atid=27&id=3980#4002 <- BigJohnT attached a plasma.zip file that includes the HAL file he uses on his plasma (plasma.hal). The Z-axis section in his HAL contains lines that according to the coments "hijack position command and feed through thc":

Whereas, the corresponding Z-axis section from my HAL looked like this (before I started futzing around with it):

I just don't know the HAL code to know what I need to modify from that section to work with my setup, I'm pretty sure "emcmot.02.pos-cmd" is going to have to change since it doesn't appear anywhere else in my HAL file. Beyond that I don't even know where to begin modifying it.

Normally it is not good etiquette to hijack a thread but rather better to start your own so threads don't run on forever.

Are you enabling the thc component when your ready to use it? I have a pyvcp checkbox that is connected to thc.enable in my hal file. If you don't enable the thc component it simply passes the Z commanded position through to the stepgen.

All my config files are on my web site for my plasma.

Your hal connections seem to be correct.

John

Hello,

New here so forgive my ignorance of some of the questions.

I have modified the TH300 configuration for my plasma.It functions fine excluding the float switch. The issue is when I go to run a program it tries to go past the float switch and makes the motor lose position.

I could figure it out on my own I do believe if I just new what all the different parameters for the THC configuration were. The ones I am not sure on how to adjust for my z travel and switch location on the Z axis and the float switch. Could somebody could enlighten me on this please?

The other issue I am having is that when I go to run a program the Z axis goes up to some unknown height and hits the limit switch. I can not find anything in the config file or the Gcode telling it o go up to a random height. Could somebody could enlighten me on this issue also please?

Hope my questions are not to plan and if there is any information you need please let me know and I will check back periodically to see if there is any additional information needed.

Thanks

Chop

What kind of THC do you have?

WOW I just looked at that config and what a busy HAL config that even comes with a drawing.

John

Hallo,
sorry for my bad englisch .

I start to config EMC for Plasma cutting and have a lot of trouble. I use the basic config plasma THC300, changed Ports, Axis speeds, Limits...

When i make in World mode a new 0 Point, the Z Axis Move Down from +150 to 0 and back to +150, that is wehen i zero any axis. and i can not adjust the Speed of the Z Axis when they do this. So it is not possible to zero. Where is the point to set the "length" to the Float Switsch and is there a Documentation for this config?

The A motor not jog in Joint Mode by hand, thats very bad wenn the A axis not jog.

What make Travel Height and Sw. Travel?

Edit:

I have make a new config. with plasma THC300, just invert the estop and float switch pin that it runs. The same problem, when i make a 0 point the Z axis value in Linux CNC move up and down!

Thanks

the_muck wrote:

I have make a new config. with plasma THC300, just invert the estop and float switch pin that it runs. The same problem, when i make a 0 point the Z axis value in Linux CNC move up and down!

Sorry for the delay in replying.
Does this still happen with the THC disabled? am wondering if it is something wierd with the way that THC "lies" about the Z-position to the rest of the system.
Does the actual Z axis move, or just the DRO?

He's using the THC300 config and the THC control is all done with hundreds of HAL components. It's so complex that it includes an Open Office Drawing that needs to be printed out on a D size plotter. I never could follow the logic of that one.

John

Is there a simpler sample config using the THC component?

Yes, the Plasma 5i20 config is what I used until I converted to a 5i25 7i76.

John

Hallo,
now i have changed to try a nother config, there is no documentation for THC 300 and i cant understand how it works and what the problem is.

linuxcnc.org/lucid/emc2/index.php/forum/...2&lang=italian#15198

you need the LinuxCNC dev package, and install the *.comp file.

In this moment it works not 100%, but i think it is better to understand.

Hi
I am looking at a number of possible THC configs and yours looks about the easiest one to implement. I see it has been some time since you posted this, is it working ok?
I will make some changes to use my own THC.

I have to ask, why are all the THC configs so complex and your look simple? Is it because you use a component?

Hello

Yes , look so simple because all the heavy stuff has been integrated in the COMP.
I was having problems to find a Gcode to set offsets , so I try to modify a thc comp for i520.
Finally I realize that was better rewrite the entire comp .
Was my firs attempt to write a realtime program and I think this can be done much better from someone with more experience in software
( I am just an harware technician learning C language).

I was implementing more and more inside the comp and at the end the comp make all the complicated job .
We are working more than year without problems , but just on one machine .

The comp is made to work with my own digital height controller but may work with others Thc boxes ,
off course you will loose the possibility to change from user interface Axis the cut voltage, but it will vork fine .
I will be more then happy to help you to test this comp on your machine.

Best regards

I am glad to hear that it works well. I will make use of the comp and change it to suit my own THC setup. I will let you know how it goes and probably ask many questions along the way.

Hope your skill in C programming is better than mine ,
so we toghether can make a nice comp and manuals for this community.

Best regards

Good afternoon!
Anyone have a step-by-step showing how to configure EMC2 for a plasma with THC torch height control.