500 E Global Operating Instructions
Maintenance
9
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.
Stop the abrasive flow and move the machine forward until the
blasted area is accessible. With both hands, carefully feel the
temperature of the blasted area. You will find the hot spot on
the blasted surface where the machine has developed the
highest blast cleaning intensity.
An even temperature from left to right indicates that the control
cage is correctly positioned.
Looking from the front side of the machine onto the control
cage: If the left side of the blasted area is warmer, turn the
upper edge of the control cage anti-clockwise for 3-6 mm. If the
right side is warmer, turn the upper edge of the control cage
clockwise for 3-6 mm.
This process to be repeated until an even temperature across
the blast pattern is achieved.
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. The blast
pattern will change with an increased wear of the blast wheel,
blades, impellor and control cage, and when the size of the
employed abrasive is changed.
Never loosen the cage clamps or try to adjust the control cage
when the machine is in operation.
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