Plasma Questions

John, I've attached my work in progress hal file that has the estop working. The breakaway sensor is also tied to the estop. It also has two switches for Run/Step Pause/Resume as per this thread. forum.linuxcnc.org/47-hal-examples/13201...-hold-resume-buttons .

I've since added a working MPG to the X axis. I was going to run separate ones on X and Y. I posted the code here.
forum.linuxcnc.org/27-driver-boards/2773...-7i77?start=20#85131

I think from memory, I used your HAL as a starting point.

I see it but no sure about the resolution, do you think it is enough for the application?
also, I like to have the encoder interface free for others purpose.
does anybody have experience with this card?
thanks

grijalvap wrote: I see it but no sure about the resolution, do you think it is enough for the application?

If you are talking about the THCAD it is specially designed for the application and has man happy users.

also, I like to have the encoder interface free for others purpose.

What other purpose? I doubt that you have spindle?
If you are using a 7i76, for example, you can also configure some of the GPIO pins as MPG counters for things like handwheels.

Hello

I have another question for the plasma table and developer communities.

I have an adjustment and display in my GUI for a value to limit the Z axis speed for smooth torch height control. Presently this is just a percentage which will require some calculation to get a usable value. The two ways I have found to implement this are:

1. Used the limit1 hal component connected between the Z axis PID and hardware step generator (Mesa 7I76e).
2. Use the maxoutput input to the Z axis PID.

Which of these is the preferred method? Is there a better way?

TIA

John

John, is that
you are trying to control or something else?

rodw

Well that isn't what I was thinking of doing but it may have the nearly the same result. My original intention was to limit the maximum velocity command to the step generator. I really don't care about limiting the the THC.comp gain (thc.correction-vel). thc.correction-vel is the correction step applied for each servo period (I think). What I want to do is limit the maximum velocity command to the step generator with a value from the GUI and not limit the acceleration or rate of change from the THC.comp beyond that set in the .ini file. I am sure that someone out there has a functioning system with this feature.

John