85 amp burned consumables

Problems and questions
1

Hello all I have a Hypertherm 85. I have recently switched to using 85 amp consumables and I am experiencing new problems I did not have before when using 65 amp consumables. I have had several tips and electrodes burn up bad. I followed Hypertherm’s guide lines on speeds and amps, but when I watch it burn it seems like it does not pause long enough after piercing and could be clogging the shield and creating this. Could you look at the g code and see if it looks acceptable

(Filename: PLATE,MOUNT,UBOLT,TAHOE,REAR,15-20.tap)
(Post processor: ldr_do_not_change.scpost)
(Date: 17/02/25)
G20 (Units: Inches)
F10.0
G90 G40
G64 P0.010 Q0.001 (tracking tolerances set to 0.01)
M68 E0 Q10
(Part: PLATE,MOUNT,UBOLT,TAHOE,REAR,15-20)
(Operation: Outside Offset, OUTER_PROFILES, T33: 85 amp 1/4" Steel)
(Preset Volts: 124) ( Suggested Tip Size: 25 )
( DTHC Delay: 1 sec )
( Min Cut Length for DTHC ON : 1 units )
M68 E0 Q900 (Global DTHC ON/OFF is ON )
G4 P.1
M68 E0 Q3124 (Preset Volts set to 124 Volts)
G4 P.1
M68 E0 Q510 (DTHC Delay set to 1 Seconds)
G4 P.1
M68 E0 Q711 (DTHCIV tuning set to level 1)
G4 P.1
M68 E0 Q10 (DTHC is OFF)
G4 P.1
(Pause off)
( ###########################)
G0 Z0.750
M67 E0 Q20 (DTHC ON)
G0 X4.027 Y4.112 Z0.750
M67 E0 Q20 (DTHC ON)
G0 X4.027 Y4.112 Z0.750
G0 Z0.50
o call (external Touch off from Commandcnc)
G1 X4.027 Y4.112
G0 Z0.150
M3 S100
G4 P0.5
G1 Z0.060 F75.0
M67 E0 Q20 (DTHC is on)
X4.003 Y3.913 F150.0
X8.014 Y3.924
G2 X8.050 Y3.888 I0.000 J-0.036
G1 X8.060 Y0.567
Y-0.000
G2 X8.023 Y-0.037 I-0.036 J0.000
G1 X0.012
G2 X-0.025 Y-0.000 I0.000 J0.037
G1 X-0.036 Y4.347
G2 X0.004 Y4.383 I0.036 J0.000
G1 X3.706 Y3.948
M67 E0 Q10 (DTHC OFF)
X4.003 Y3.913
G3 X4.121 Y4.051 I-0.010 J0.128
G0 X4.122 Y4.052 (Add tiny extension)
M5
o call
M68 E0 Q10 (DTHC is OFF)
G4 P.1
G4 P0.5
G0 X4.121 Y4.051 Z0.750
(No Parking values detected. Moving back to zero, zero)
M68 E0 Q900
M68 E0 Q10 (DTHC is off)
G4 P.2
M5 M30

2

This looks like a controller and plasma source question, experts for the brands you mention. Consider posting your question in plasmaspider.com which has expert followers from and categories for both of those brands.

3

Why are you using 85 amp consumables to cut 1/4"? i thought it was usually recommended to use the lowest amps and consumables you can for the thickness of material you’re cutting. I don’t have the cut charts here, but you could probably get away with 45 amps on 1/4".

4

These are production runs, I need these done fast. The whole reason I upgraded to 85 amp. I had a 45.

5

isn’t it sheetcam that sets the G-code? I was wondering about the pierce delay.

6

I may have misunderstood your original post.

Sheetcam produces a gcode file yes, but the you, the CAM toolpath designer, make the choices to drive the gcode production and cmd values, such as pierce delay, which is a field in the Plasma Tool definition, that you define.

The post processor that you use is about sequencing the gcode and values as much as it is about which gcodes are used. But that is how we all customize sheetcam for different CNC machines, controllers, and other equipment used in the process.

So you presented a sequence of gcode and parameters for specific equipment, and asked that sheetcam followers (experts in toolpath CAM) verify that specific gcode for specific equipent is correct (“looks acceptable”).

I am merely suggesting that you may find more experts to get your answer relative to correctness, for specific equipent, in another forum. If you need help implementing a different (aka more correct) gcode sequence, then you are seeking help in the right place now. You have to tell us what the correct gcode sequence is though, then we can make sheetcam do it.

7

Yikes, I am but a simple man, and I think I understand your answer and will ask on Plasma spider. Thank you