Thursday, 29 April 2010

Instructable- Sandblasting

Glass Beads

Glass beads produce a much smoother and brighter finish than angular abrasives such as sand or steel grit. Glass beads can be recycled approximately 30 times. Grit sizes range from 50-325 and are round in shape

Bead blasting is the process of altering the surface finish of any material by applying fine glass beads at a low pressure without damaging the material

The Sandblast Gun

Abrasive blasting is supposed to be a scrubbing action, not a damaging process. Therefore, the gun should always be aimed at a 60Ў to 45Ў angle to the surface being treated. When the gun is aimed at 90Ў, damage occurs and, due to the abrasive particles colliding with the abrasive bouncing off the surface, a very high rate of media wear occurs.

The gun in a blasting cabinet should be kept at least 20 cm from the surface being blasted. This allows the spray to spread out and cover a larger area. Blasting a larger circle allows for better overlap of the pattern and you achieve a more even and appealing finish.

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