Tip and Electrode burn ups

[pitbumpers]

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

[weldguy]

Hard to me to tell from your gcode but you mention you have your speed and amps set to the book but are your piercing and cutting heights correct? I like to confirm this by actually measuring the heights rather than just trusting it will be what I set it to be on my screen.

[SegoMan DeSigns]

Do you have a pressure gauge on the back of the machine? Sounds like lack of air to me. Try going to manual set and raise the pressure for a test cut.

[tcaudle]

Something does not look right on the touch off call in th g code. It should look something like this:
o<touchoff> call (external Touch off from Commandcnc)

The text between the < > is the name of the subroutine its calling. Yours has noting.
There are some other things missing but with no touch off its not going to start at the right height and that WILL burn consumables.

Use the touch off test button int he MANUAL tab . It should go down and STOP . it will not rise up to offset the mechanical sensor (if its not Ohmic) or move to pierce height, but its confirms its working.

Get our DTHCIV Setup and Testing Manual off the website (SUPPORT/MANUALS) and find the INITIAL CUT TEST (about page 85) and set up and run the individual tests. Juts a couple of long straight lines Use your POST to make the cut file .

If that fails (touch off ) then get the latest POST for CommandCNC and SheetCAM (SUPPORT/DOWNLOADS) and run it though that and the tests again/

[tcaudle]

Also the Z DRO is not getting updated because THAT subroutine is missing so the Z is not tracking all of its moves .
Wont matter too much on really flat material, but we are not dealing with large gaps here wit it cutting at .o60.
I dint think its a delay problem because there is a .5 second pierce delay and at 85A that should be fine. I think it;s more about pierce HEIGHT and initial CUT HEIGHT (before DTHC cuts in in one second after ti moves to cut height.)

[pitbumpers]

Thank you T Caudle, the missing info, would that be a sheetcam issue? Like I said, i did not have these problems with 65amp consumables. Thank you

[tcaudle]

The POST has ether been changed or corrupted. its missing calls. The only reason you are not having trouble with 65A if you use that same POST is because its less power .Get the post fixed or switch back to 65 consumables

Touch off piercing and initial cut is NOT handled by the DTHC . Its all G-code and you don't have the right G-code