Plasma Cutter

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Plasma cutter.png

Make: Miller

Model: Spectrum 875

Ace: Levi Gibson (

Location: Welding Shop


The plasma cutter is a handy tool when fabricating. This machine will cut up to 7/8" mild steel at 10 inches/minute and can roughly sever up to 1-1/4" plate. The pierce capacity is 7/16" so you will need to edge start any thicker material. The torch is hand controlled so you can cut out many types of designs. You can also use material as a guide to cut straight lines or various shapes.

Here is an example of this piece of equipment being used.



  • Duty Cycle- This is a percentage of a 10 minute cycle that the machine can be running without overheating at 104 degrees F. Running at 60 amps our machine has a duty cycle of 40%. This allows for 4 minutes of cutting and 6 minutes cooling.
  • Edge Start-
  • Pierce-
  • Gouge-

User Manual



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General Procedure

  1. Place fume hood over the area you will be welding at
  2. Turn air on
  3. Turn plasma cutter on
  4. Attach ground clamp
  5. Measure thickness of material being cut and refer to chart for current setting on machine
  6. Set the current on the plasma cutter
  7. Place the drag shield on the edge of the base metal, or hold ⅛ inch off the surface. Direct the arc straight down.
  8. Raise the trigger lock and press the trigger, this will engage the pilot arc
  9. Once the cutting starts, begin to slowly move the torch across the metal
  10. Adjust your speed so the sparks go thru the metal and out the bottom of the cut
  11. At the end of the cut, angle the torch slightly towards the final edge or pause briefly before releasing the trigger
  12. Turn off machine
  13. Turn off air
  14. Disconnect ground clamp


  1. Don't cut lead, zinc, copper, cadmium, or beryllium.
  2. Don't attempt to cut with the compressed air off
  3. Don’t cut with the vent hood off


Foxtale Course


  • If the temperature status light turns on most likely you have exceeded the duty cycle of the machine. You will need to wait 15 minutes for the machine to cool down.


General maintenance

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Specific Maintenance Tasks

Maintenance Procedure Frequency Done By
Sample Sample Sample