QTPlasmaC - How to enable FULL THC?

Hi Everyone,

I have a plasma table I built this year with a Mesa 7i96s and a Mesa THC05. I am running Sheetcam with post processor "PlasmaC" version 0.5, which I'm told is the newest. The issue is my machine is only doing IHS, not THC. I went through the trouble of making a Linux machine specifically for THC. I have everything enabled in QTPlasmaC, but it still won't make adjustments. 

I checked one of my programs created with Sheetcam and the M code used to enable THC is M65P2, which if you look at the user guide is for "immediate THC". Can I just change the M65P2 to an M63P2 (synchronous with motion) and be good to go?

Thank you,

Hi Tommy,

Thank you for the reply. Do you mean void anti dive or velocity anti dive? I guess I never paid attention to this. I'm fixing a leak on my water table right now so I can't run it to test yet. VAD threshold was set to 90%, not sure what this does. Cutting feed rate for this material is 45ipm in sheetcam, but I have it slow down to 40ipm for holes. In QTPlasmaC it was on a default material at 157ipm. I was under the impression that was only for conversational programming so I ignored that thinking that it would use the feedrate programmed into the part program. The THC enabled LED is on.

Here are my THC settings:
50 sample counts
1.00v sample threshold
1.00v threshold
10 speed (PID-P)
90% VAD threshold
500v/sec void slope
5 PID-I
5 PID-D

Thank you

Hi Tommy,

Thank you again. I'll take these recommendations and give them a shot. I wasn't aware the THC locks in a position, I thought that it would constantly remain variable. Should I load in material at a slight angle to see if the THC compensates? I would also like to see more of your machine, the rapids look pretty fast.

I just tested the THC and watched everything. The LED "THC Active" does turn on when running, but no adjustments are made. The voltage at the close side was around 90-94 volts, on the far side it was 115 volts.

I was going to go with Mach3, until I learned that Mach3 doesn't support THC. So I went the very painful linux route, and it doesn't work. It's turned on, it even says it's working. Is this a PID issue on the parameters page? There's no Z movement during THC.

It shows 13-20 volts. When it's idle it stays at 13 volts, when it's moving but not cutting it's closer to 20 volts.

I did not disable velocity anti dive, but I've never turned on void anti dive. I don't know what either of those do.Yes I checked the feedrate. Feedrate slider is set to 100%.