The choke got rid of my noise issue, but I’m also now having some THC problems. My torch seems to not touch the metal surface on the first go at running a program and loses arc voltage immediately as the torch stays nearly an inch above the material. Once I restart, it works fine initiating the torch height. I did notice last night that during a large loop the torch slowly started to rise and was around 1/2" off the material by the end of the loop.
Also, I’m getting pretty bad beveled edges with the razorweld x45. I’m sure that’s my program settings or moisture but I can’t seem to narrow it down. This is my first CNC plasma table that wasn’t already setup for me. I replaced my tips with quality ones and it helps, but still isn’t great.
Here’s what I’m using on 1/8 hot rolled mild.
.15 pierce delay
.115 TH
115 IPM
45 amps
PSI maxed out at the RW (I think 75psi internally regulated)
Am I way off where I’m supposed to be? Or should I be getting good cuts with those settings and likely have a moisture issue? I’m using a dessicant dryer at the compressor and one at the plasma. I’m using 50ft rubber hose which likely isn’t helping either.
your torch height is too high. Go down to .060 - .072. I had the same issue the other day I accidentally did .72 instead of .072 and ruined 2 nozzles. Id also raise your pierce delay. I do a .5 pierce on 14 gauge
2 Likes
Does torch height stay the same or is it dependent on material thickness? I want to take a stab at some 1/4 but I’m not sure where to start on the TH. Seems the spreadsheet floating around here doesn’t list TH.
same and then the thc will control it up and down to stay at the same height over your material. RW recommends .060 but I read somewhere .072 was the sweet spot. Ive been running .072 with good results. Just make sure its not .72 like I did for an hour and ruin nozzles 
1 Like
Are you using smart voltage or are you setting a voltage for THC?
We started that in the olden days before there was THC for the Crossfire 
I figured that was the case but wasn’t sure since you still had to set the height at something, right? Maybe it was just one shim so everyone assumed the height was always the same?
Can you look into possibly adding a “trigger delay” feature in Fire Control? The way it is now I also have nearly a full second delay in my plasma cutter trigger circuit which has to be added to the pierce dwell in the g-code. Under the current setup If at some point I change my plasma cutter all my g-code files are likely not going to perform right and would have to be reposted. Adding a trigger delay feature in Fire Control preserves the files.
2 Likes