I have a plasma machine that works off of Mach 3 to cut and bevel pipe. I am having a problem with G codes possibly. When I run the G code it makes the first cut just fine but when it gets to the point to start the second cut the torch turns on and then shuts off without even giving the torch a chance to create an arc. The plasma machine is not showing any default and because its making the first cut just fine leads me to know its not the plasma machine itself. I am also using THC 300 with this whole machine. Could anybody help me and give some input into why it would be doing this? Is is the G code? Is it a setting in Mach 3?

i have had the same problem before. are you using lazycam? i create toolpaths in turbocad. i found that i have to explode all arcs and then  join polylines to get rid of that. for some reason lazycam would insert extra m3 m5 commands if left as lines and arcs. another thing could be tiny pionts left on a drawing. lazycam will create a m3 m5 for those.

I am writing the G codes manually. We usually use Palsma Cam but I don't think that it can create a G code that would bevel pipe. Yet I am not for sure on that as well.

Can you attach your code please?
Hood

G90 G0Z.5
G91 G0B-37.5 X5.0
G90 G1Z-1.40F100
G91M3
G4 P.9
G1 X.16F75
G1 A20.50F30
G1 X-.16F75
M5
G90 G1Z.5F100
G91 G0B37.5 X-.625
G90 G1Z.08F100
G91M3
G1 Z.3 F50
G1 Z.08
G91
G1 A20.82F30
M5
G90 G0Z.5
G91 G0B37.5 X-1.625
G90 G1Z-1.60F100
G91M3
G4 P.4
G1 X-.16F75
G1 A20.50F30
G1 X.16F75
M5
M30

only thing I can see missing is the G4 dwell after the second M3

Graham