Plasma Cutter

Make: Miller

Model: Spectrum 875

Ace: Levi Gibson (lgibson19@georgefox.edu).

Description

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.

Documentation

Terminology

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

Training

Operation

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Demonstration

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General Procedure

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

Safety

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

Certification

Foxtale Course

Troubleshooting

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.

Maintenance

General maintenance