© 2011 Blastpro Manufacturing Inc.
®
28. After confirming that the shot blasting machine is blasting in an even, desired
pattern, begin to once again walk behind the machine to operate it in a forward
direction. Make certain to not exceed the amperage rating for the operating
voltage.
29. If blasting becomes inadequate, it may be necessary to adjust travel speed. A
faster speed will produce a more shallow profile while a slower speed will produce
a deeper profile.
30. Once a satisfactory profile has been obtained, continue to blast in straight lines.
Blasting in straight, consistent lines gives the best results.
31. In order to clear small obstructions on the surface being cleaned, simply pull up on
the steering handle. Caution must be used whenever lifting up on the steering
handle. This is because such a maneuver can cause the magnetic seal between
the shot & the surface to be broken. If this seal is broken, shot may escape from
the machine at a very high velocity.
Setting the Blast Pattern:
Setting the proper blast pattern is determined by trial & error. The importance of selecting
the proper blast pattern cannot be overstated. An improper or unevenly distributed blast
pattern will result in excessive blasting on either the right side or left side of the machine
& will leave shadows or “track” lines in the blast pattern.
1. Verify that the blast wheel is rotating in the direction shown on the blast housing.
2. Place a sheet of steel approximately ¼” thick under the machine & then blast with
the shot valve fully open for approximately 30 seconds. Do not move the machine
during this time.
3. After blasting for thirty seconds, shut down the machine & inspect the blast pattern.
The “hot spot” should be in the center of the width blasted. The “hot spot” can be
altered by rotating the control cage in small increments. Rotating the control cage
in a counter-clockwise direction will move the “hot spot” to the right while rotating
the control cage in a clockwise direction will move the “hot spot” to the left. If you
visualize a clock, the opening of the control cage should be set at approximately
11:00 (leading edge) & 9:00 (trailing edge) on the clock. The size of steel shot used
will impact where the “hot spot” appears in the blast pattern. The operator will need
to adjust the control cage based upon the size of steel shot utilized.
The setting of the control cage will vary depending both on the size of shot used & on the
type of surface being blasted. When altering the position of the control cage, make sure
to only adjust it in small increments. Keep adjusting the control cage until the desired blast
pattern has been obtained. Once the desired blast pattern has been obtained, the blast
pattern should remain consistent. Four factors may affect the blast pattern. Of these, the
control cage setting is the most crucial. Other factors that may also affect the blast pattern
include the size of the shot being used, the wheel rotation, & the worn wheel kits. If
adjusting the control cage setting does not allow the desired blast pattern to be achieved,
then it is important to narrow down what is causing the problem. First, take into
consideration the size of shot being used. If this does not resolve the problem, then check
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