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5.10 Adjusting the blast pattern
The adjustment is effected by loosening the cage clamps (1) and
turning of the control cage (2).
The cast groove on the control cage(2) shows the position of the
control cage opening.
a) Move the blast head of the blast machine onto a 5-8 mm thick
steel plate and blast for 15 seconds at full amperage without
moving the machine from the spot.
b) Move the machine from the blast zone and carefully inspect
the steel plate.
c) You will find the hot spot on the blasted surface where the
machine has developed the highest blast cleaning intensity.
This spot is normally somewhat lighter than the rest of the
blast cleaned area due to the large amount of heat that is
generated.
d) If the 'hotspot' is too much on the right, turn the control cage a little bit clockwise: Loosen the cage
clamps to adjust the position (3-6mm). Look at the notch which indicates the central position of the
control cage window. Tighten the cage clamps after adjusting.
If the 'hotspot' is too much on the left, turn the control cage a little bit counter-clockwise.
e) Repeat the process until an even temperature across the blast pattern is achieved. An even temperature
from left to right indicates that the control cage is correctly positioned.
f)
Now the blasting procedure can be started. When a concrete surface is to be blasted, check the blast
pattern again after some meters and re-adjust slightly if necessary.
WARNING! Never loosen the cage clamps or try to adjust the control cage when the machine is in
operation!!
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