Harbor Freight Tools ITEM 60738 - Manual (Page 15)

Page 15 For technical questions, please call 1-800-444-3353. Item 60738
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General Operating Instructions
1. Turn on the air compressor to supply
compressed air to the Blast Cabinet.
2. The operating air pressure for the Blast Cabinet
is between 50 and 125 pSI. Pressures up to
125 PSI can be used, but this breaks down some
type of media prematurely (i.e., glass bead).
3. Start by setting the Air Regulator at 80 PSI.
Most parts for blasting can be successfully blasted
at 80 PSI. For light gauge steel, aluminum,
and other more delicate parts start at a lower
pressure and gradually increase the pressure
until the desired finish is achieved. For more
pressure, turn the Air Regulator Knob clockwise.
For less pressure, turn the Air Regulator
Knob counterclockwise. (See Figure J.)
Blast Gun Angle and Distance
TO pREVENT SERIOUS INJURy:
point the Blast Gun away from yourself and others and only towards the parts being blasted.
Never blast with either Side Door open. While loading and unloading media,
no one, except the operator, should be near the Blast cabinet.
1. Aim the Blast Gun at the parts at a 45° to 60° angle
which will direct the ricochet of media towards
the back of the Cabinet. Hold the Blast Gun
approximately 6″ from the parts being blasted.
2. Do not hold the Blast Gun at a 90° angle to the
parts being blasted. This will cause the media blast
to bounce back into the blast stream and slow the
blasting action. A 90° angle will also cause excessive
wear on the Blast Gun and viewing Glass Window.
The Metering Valve
1. The Metering Valve adjusts the amount of media
being pulled into the Blast Gun. This Valve,
located at the bottom of the hopper, has the
media stored on top of it. When air is sent to
the Blast Gun from the Foot Pedal, a vacuum
is created that sucks air and media up into the
Blast Gun through the clear media hose.
2. A Bolt on the top of the Metering Valve can be
adjusted to vary the amount of air that is sucked
through the holes in the Valve. If the holes are
too far closed, the mixture will have too much
media and the Blast Gun will pulsate. If the
holes are too far opened, too little media will go
to the Blast Gun and production will decrease.
Shut Down procedure
1. When the abrasive blasting job is completed, release
pressure on the Foot Pedal of the Blast Cabinet.
Turn the Power Switch to its “OFF” position and
unplug the Power Cord from its electrical outlet. Turn
off the air compressor. Press the Foot Pedal again to
release any remaining compressed air in the system.
2. Disconnect the compressor air hose from the
Quick Connector on the Air Regulator.
3. If necessary, empty the Cabinet of any
remaining media by unscrewing and
removing the Metering Valve Plug.
Always use Pipe Thread Seal Tape when
replacing the Metering Valve Plug.