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. Your goal is to find the right balance of air and media, so the air flowing in the media hose is carrying just much media as it can. 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. The pickup tube has vents that allow you to increase or decrease the amount of air in the mixture. The air/media mix delivered to the blast gun by the media hose is regulated by what Guyson calls a pickup tube located at the bottom of media supply hopper, or occasionally the hopper at the bottom of blast cabinet. If the mixture of media and air is off, you will have either too much air and not enough media, or too much media and not enough air. When compressed air is metered into a suction-blast 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 projected out through the nozzle. The good news is that, ordinarily, you should not have to repeat the adjustment process frequently.
This 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. Whether you are newly responsible 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 for some time, you might find some useful tips in this article on fine-tuning suction blast media delivery. Pressure-blast nozzles have only one larger hose to deliver a mixture of media particles and air. If you are not sure if you are working with a suction-blast gun, it is easy to recognize, because it has two hoses attached to it, one delivering compressed air and one vacuum hose drawing media into the gun. Suction-blast machines are the most common blast cabinets in use, and Guyson’s Tech Support team regularly answers questions about how to get the maximum performance from suction-blast guns.
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