Suction Grit blasting cabinet machines are the most common blast cabinets in use, and the Grit blasting Machine Support team regularly answers questions about how to get the maximum performance from suction-blast guns.
If you are not sure if you are working with a suction-blast gun, it is easy to recognize, because it has two hoses connected to it, one delivering compressed air and one vacuum pipe drawing media into the gun. Pressure-blast nozzles have only one larger pipe to deliver a mix of media particles and air.
Whether you are newly effective for a cabinet-blasting process and trying to understand how to make it more efficient, or you are a person who has done shot bead, or grit blasting machine for some time, you might find some valuable tips in this article on fine-tuning suction blast media delivery.
suction blaster cabinet is an important topic because suction-blast systems are so prevalent and because under-performing blast guns slow down the work and may result in finish variations that are unacceptable. The good news is that, ordinarily, you should not have to repeat the adjustment process frequently.
When compressed air is metered into a suction blast cabinet gun through its air jet, venturi effects generate a powerful vacuum in the media delivery hose that draws media particles up to the gun, where they mix with the flow of air and are propelled out through the nozzle. If the mixture of media and air is off, you will have either too much air and not quite media, or too much media and not enough air.
The air/media mix delivered to the blast gun by the media hose is regulated by what grit blasting machine calls a pickup tube located at the bottom of media supply hopper, or occasionally the hopper at the bottom of the blast cabinet. The pickup tube has vents that allow you to increase or decrease the amount of air in the mixture. More vent air reduces the number of media particles that are entrained in the flow of air to the gun, and less vent air increases the vacuum in the media hose and pulls more media particles.
Your goal is to find the right balance of air and media, so the air flowing in the media pipe is carrying just much media as it can. That way you will get the maximum number of media impacts per second to do the work as fast as your machine will do it.
It does not matter if you are working with a single-gun suction blast cabinets or a multiple-gun automated system, the diagnostics and the adjustments are the same, except Multi-Blast machine purchasers have to repeat the procedure for each blast gun.
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