THC experimental

Rick, if you are referring to me, i did not test it, i just had a look at the code.
It is nice that it limits the amount of correction so it does not jump a lot, and makes for nicer cuts even when the correction value is set high.
On the configs i use, i have a setting on the panel for the amount of correction to be applied to Z axis with every up or down pulse, so when cutting flat i set it at a lower value to get smooth cuts, and set it higher when cutting easily bending material or slopes, makes cuts with a bit of bunny hoping but gets the job done nicely.
Will have to wait till the next run of ordering Mesa boards to get a THCAD and play with it, gona take a while.
First order of business is finishing the Elumatec retrofit, still a lot to do as i am limited with the time i can spend there, usually 2-4 hours a day. To cold even with heating, dang i miss the summer.
Regards,
Tom
P.S.
I did register with Texas Instruments, and they will happily ship samples of some voltage to frequency converters, but there is no Kosovo in the shipping states. I really hate that since US is the first state that recognised it as an independent state. That is the reason i have to find ways of getting stuff from abroad, and that takes a lot of time.

Rick, I've been slaving away at implementing the current THC.comp in master and after implementing corner lock in my GUI, I found that the pin is never used in the current code.

github.com/LinuxCNC/linuxcnc/blob/master.../components/thc.comp

I see your code does use the vel-tol pin. I wonder if there has been a regression in the current master code?

Looks like I'm going to learn how to compile HAL components now...

rodw,

There seems to be a few versions of the THC out there. That one uses a parameter that you can set / change in Hal.
If you are working on your panel you might want to bring the THC correction amount out to the panel also as Tommylight has mentioned.

Rick G

Did anyone have a look at that config to see the panel? It has everything needed except the voltage.
I am refering to the config i use, thread is something like "thc that works".
There is also a version of it that uses voltage and has voltage setings on the panel, named vldthc or similar, also on this forum. Those are the panels that have everything you might need for a thc, the only thing i can think of worth adding are presets for say 3mm 5mm and 10mm with respective feeds and voltages and other settings.
I might add that after i finish this job of retrofiting the Elumatec.
Regards,
Tom

forum.linuxcnc.org/forum/10-advanced-con...limit=6&st=&start=18
forum.linuxcnc.org/49-basic-configuratio...hc-config-that-works
Found them

tommylight wrote: On the configs i use, i have a setting on the panel for the amount of correction to be applied to Z axis with every up or down pulse, so when cutting flat i set it at a lower value to get smooth cuts, and set it higher when cutting easily bending material or slopes, makes cuts with a bit of bunny hoping but gets the job done nicely.

I'd like to know a bit more about how the Mesa THC component should implement the correction.

Rick G wrote: rodw,
There seems to be a few versions of the THC out there. That one uses a parameter that you can set / change in Hal.
If you are working on your panel you might want to bring the THC correction amount out to the panel also as Tommylight has mentioned.
Rick G

Thanks Rick, I've been working on the gomoccappy plasma screen which has provision for a correction amount. You have a couple of extra pins that will redefine the work I did over the weekend but its all good.

tommylight wrote: Did anyone have a look at that config to see the panel? It has everything needed except the voltage.

Tommy, I did look at your setup but when I decided to use the Mesa stuff, came up with this in gmoccappy. You've got everything but the volts and I've got everything but the THC correction!

image missing http://i210.photobucket.com/albums/bb270/rodweb/Lathe/Plasma/gmocappyplasma_zpsgunhhk5n.png

Anyway, I've got all of the THC stuff done but I did not understand what the author had intended what the THC Spd+ and THC Spd- buttons were to do. but now I know what they are designed for. So while those of you that have working machines experiment with cutting, I'll have to stick to the software.so it would be great if you could help with this. So which pin should it control and what is the correction scale? Currently, the readings go from 1-20% which did not make sense to me.

Please let me know and I'll try and finish this off and share my config.