Well....then it sounds like the consumable parts were good, and you had the proper pierce and cut heights.....so there has to be an issue with either the design of the plasma....or there is a defect with the plasma. I would not be able to reproduce a cut with any of my cnc plasma's that had cut edge angle variations as bad as the ones in your picture!
Since you don't know what the plasma is (brand, model, power level, gases used, etc.) then it is virtually impossible to offer good advice.
the machine is a tecmo P-60 Plus.
i changed the nozzle this morning and got a decent cut at the 3rd try. less then 1 degree out of angle, decent cut-surface but quite alot of dross. after that i spent a few hours trying to find good parameters but all i did was to wear out my last nozzle. i finally found good parameters so i got no dross and decent cut surface but quite a bad angle. i am guessing that the angle is because of the ramp next to the hole on the nozzle(both look the same) but would i get a better cut surface with a fresh nozzle? considering the dross i guess i didnt hit the sweetspot as well with the first part as the last.
the part i mentioned first is the one with the hole:
i turned up the air pressure to 7,5 bars that helped with the dross. the warning-label was on the other machine...
i have been cutting with another machine, a Deca PAC55 and managed to get some pretty good results. the angle is reduced to 5-7 degrees but the ripples is not straight as you can see in the pictures. i read somewere that this is because of to high feedrate? is this also causing the rounded corners on the backside? i got some dross on the backside that was easy to remove. i read in a hypertherm manual that this would indicate to low feedrate. the nozzle was quite worn out when i was cutting these pieces..
I am using a miller 625 spectrum plasma 40 Amps 30 IPM .120 cut height
with brand new tip and electrode.
It cuts fine in one direction but when it turns the corner
I get a bad angle on the cut.
I checked the torch and it is not angled.
It dose not do it all the time.
I allsow have a problem with angular cuts, My plasma resonator is a Rofin Sinar DC035 (3500W), and the CNC is CR-Electronics. I will post later during today some pictures of my cutt results on mild steel 4mm thickness.
some explanations about the CNS's symptoms, if you want to cut round pieces, on top (the piercing side) the cuts are perfect, round, on the bottom they are oval (angular) on the X axys.
Pleas can somebody helpp me.
yes i am interested in findig out the reasons why the angular cutt apears.