After kicking around the idea of building a CNC plasma, I eventualy bought a secondhand (new) EZrouter machine via this site, last year - it was only 15 miles away and I was cutting within a day, even though my bank balance was somewhat worse for wear!
In general this has been a good machine, the odd teething problem and a couple of build mods have been required, but generally good.
The problem I have is that occasionally (1 in 50 or so small parts) the THC will lift the torch clear of the work such that the arc fails (approx 40mm) at this point the x and y motion continues, but this part is obviously ruined. The next part to cut is usually ok again. I am only cutting small pieces at present, but it worries me that if I were trying to cut large metal art I could end up wasting a lot of time and material. This problem has been present from the start, but I havn`t done that much with the machine and have not worried about it until now.
The THC is a THC300, and I am running Mach3 after processing with sheetcam. Any suggestions of where to look for issues would be greatly appreciated.

Thanks

Geoff