Another plasma component...

tommylight wrote: Well, got it working with a mesa 5i25/7i77 and noticed some things :
twopass is very picky about where what is, and sometimes things just do not work, and no error is reported. The Gui works but the links in hal fail. Noticed that way earlier but did not have time to investigate, still do not know what is going on, but i can bet that it has to do with the order of things to load.
Reverse run runs only forward ! This was working on previous versions.
All the THC related stuff enabled as soon as Linuxcnc starts, even while in E-stop, has to be changed and some more interlocks added, although they are not explicitly needed.
Attached the config is someone wants to have a go at it. Velocities are way to high, scale at 40 steps/mm for X and Y, 500 s/mm for Z.
I have to attach some hardware to it very soon.

Can you do man plasmac and see if V0.18 is the latest?

Reverse does work on the sim here.

What THC stuff is enabled that shouldn't be, or do you mean the config items in the left hand panel?

Cheers, Phill.

For some strange reason I am not getting any emails when this thread is written to.
I do have the subscribed box checked...

@PCW, if you are reading this, when i set the THCAD to 1/1 i do not get any reading form the 7i77 even at 0V input? That seems odd, or am i missing something ? I have the 300 variety of it. Still did not test it at higher voltages, i need a 300V/10mA power source! I have 2 tha so 60V at 2A so that will have to do for now. Hmmm i do have some that do much more driving some Helium-Neon lasers, but they most certainly do much much more, so it's a no go! Mains i can choose between 220V and 380V but i am not going there. Will have to dig out something usable in the workshop.
Later.

7Ii77 muxed encoders have a default sample frequency of 6 MHz, if you have the filter enabled it requires 15 counts of this 6 MHz clock to be recognized (2.5 usec). Since the THCAD outputs 1 usec pulses in 1-1 mode these will not get past the input filter.
There are a couple different ways to fix this, one is to disable the encoder filter, the other is to slow down the THCAD output frequency
Using a slower output frequency has the advantage of better noise immunity (you do need to scale your scaling numbers when you do this)

Note that you do not lose resolution when you use the divided frequency output because the encoder counter does velocity estimation
based on both counts per unit time and measuring then pulse period

@Rod,
i set mine in mode 3 always for experimenting so i can use analog inputs also.
@Phill
Yup i have the version 0.18.
@PCW,
thank you, that explains a lot.
Thank you all.

Added some more configs to the original threat, a full servo system, and with THCAD
Just in case:
forum.linuxcnc.org/plasma-laser/34978-th...-configs-with-how-to

phillc54 wrote: What THC stuff is enabled that shouldn't be, or do you mean the config items in the left hand panel?

That pertains to the plasmac component having everything active even while in E-stop. I will see how can all be disabled, and enabled only when needed.
It is safer to have some interlocks incorporated, who knows, under some conditions it might just fire the torch or move the torch down hitting the material and breaking a limit switch or distorting the Z axis altogether.
I like to avoid such occurrences as i do not know who will be using those machines.
Or as i read in some forum a long time ago:
Nothing is foolproof to a talented fool!

tommylight wrote:
Reverse run runs only forward ! This was working on previous versions.

I still cannot fault it in the sim.
You need to have M52P1 in your gcode to turn adaptive feed on (P0 will turn it off).

Cheers, Phill