Guyson Euroblast PF, Operating & Maintenance Instructions

Page: 24 / 84

Operation &
Maintenance
Manual
Issue: 09 A6ML0165 - Euroblast PF Manual
Date: 05/2019 Page: 24
5.1.3 Stand-off distance
This is the distance of the gun nozzle from the component. The stand-off distance should not normally
be reduced below 50 mm as media from the nozzle will be deflected or slowed down by media
ricocheting from the surface being blasted.
The impact of the media can be affected by the stand-off distance and the air pressure. The type of
media will influence this but a larger blast area may be achieved by increasing both the stand-off
distance and the blast air pressure.
5.1.4 Angle of blasting
The optimum angle for blasting for surface finishing is between 90 and 60 degrees to the horizontal.
Shallower angles can cause surface damage or compromise material properties. Shallower angles
than this can be used for deposit removal where the surface finish is not critical and with softer media.
Blast guns should be angled to minimise interference between the outputs from different guns. This
will avoid disrupting the speed and direction of media between nozzle and component.
Always position guns pointing away from any cabinet openings; this minimises the risk of media being
blasted out of the cabinet.
5.2 Extraction settings
5.2.1 Dust collector
The air-flow must be sufficient to create a slight negative pressure inside the cabinet to prevent dust
from blowing out. The airspeed must also be high enough to carry the blast media and dust out of the
cabinet and up the extraction hose to the inlet of the cyclone. This varies with the size and weight of
blast media.
The suction in the dust collector should be such that a minimum amount of media is transferred into
the dust collection system.
This is altered with the damper/blast gate on the dust collector outlet/inlet:
• Opening the damper/blast gate increases the suction
• Closing the damper/blast gate reduces the suction
When setting the dampers/blast gates always keep the extraction air-flow to the minimum needed to
avoid pressurisation of the cabinet during blasting. Over time the filters in the dust collector will
become clogged with dust, and an increased air-flow may be necessary between filter changes and
maintenance. In systems with a cyclone the extraction should be set so that a minimum amount of
media is transferred into the dust collection system.
Always check the waste bin for good media when adjusting any settings.