Operation Manual
rev. 1.0 of 19.11.2018
-19-
MasterCut 120 CNC MOST
Plasma Cutter
10. Problems occurring during work resulting in poor cutting quality
After starting the device, the pilot arc does not appear: Wait for 15 seconds for air test and device test. Then
press the torch button.
Figure 7: Problems occurring during cutting.
Incorrect penetration of plasma arc: The cutting quality is low due to too high speed. Make sure that
plasma arc angle does not exceed 15 ° (see Figure 7):
•
excessive cutting current for the parts in use.
•
excessive material thickness.
•
incorrect connection of the grounding cable with material.
Plasma arc is unstable and „shoots” or suddenly goes out:
•
nozzle (see figure 7) or electrode worn out.
•
excessive air pressure.
•
pollution in compressed air.
•
humidity in compressed air.
Edges of the cut are not perpendicular (see Figure 7):
•
switch the device off, unscrew the torch cover and rotate the nozzle 1/4 in relation to the previous
position and try to restart the cutting.
•
nozzle or electrode damaged - replace.
•
position of the torch during cutting not vertical in relation to the material.
•
nozzle being too far from the material being cut.
