Rotary Z axis plasma

Hi, i like to have an rotary Z axis on my plasma system to try if i can get better hole qualty, so the torch have to turn like an tangential knife axis.
Is there a standard post prosseror that can be found or modified to give this a try?

It’s probably been tried already, but I can’t find the right information yet…

Isn’t this description basically an Inside offset Jet Operation on a circle shape ?

Sounds like he wants to physically rotate the torch with a motor. Not sure how this would work, or what it would accomplish.

Yes I like to turn the torch with an additional motor.
For example when cutting a square, it’s impossible to get all 4 sides exactly on 90 deg angle (on air plasma cutters)
The idea is to adjust the torch on 1 side till the cut is exact 90 deg angled, and while cutting turn the torch on corners to keep the adjusted side on cut edge.

I think when i can combine an plasma and tangential knife post processor I can give it a try.
But I don’t know if it’s possible and if yes, how to do it… so all tips are welcome

You are describing an XYZC tool CNC machine. Not a sheetcam function.

You’d be better off diagnosing your torch kerf bevel.
searching plasmaspider.com will help in finding causes and remedies.

Then there is cutting direction relative to the ‘save part’ being on the correct side of the plasma jet swirl. sheetcam has a reverse direction (of cut) check box in the Jet Operation settings, this is usually checked (as in reverse direction) for plasma cutting due to the jet swirl exiting the nozzle.

Exactly, i mean this XYZC system.
i thought these are the same movements as a tangential knife, ist it?
i found some older posts about a C axis and i think this comes really close to what i want:
Tangential Knife/Drag Knife? - Problems and questions - Sheetcam

is it possible to have a reference (G28.1 or G31) in this post processor?
can i just copy/past functions blocks in a post processor? i like to know more about this, any tips where to start?

Thanks, Harold

I stand corrected based on the thread you reference, sorry about previously mentioning “not a sheetcam function” for XYZC machine. I was not familiar with a tangential knife machine where C power rotates the knife.

I took a quick look at the post in the referenced thread and see how the C angle is derived from the XY next motion. Interesting.

Perhaps your next action is to reach out to @Joey to inquire how his machine has progressed with his custom post in the past year.

As for using G28.1 and G31 in a pp; yes, that and variants of it with G28 and G38.2 are done quite often.