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Ben78 01-05-2013 12:47 PM

Sandblaster help
Hi guys,

I'm hoping somebody can help me out here. I built a Sandblaster out of ply and have 100 lbs of glass bead in it. I'm using a Campbell hausfeld $15 Sandblaster I got off amazon. The cabinet is siliconed and pretty airtight. We've got a huge air compressor, so I don't have any problem with pressure. I cut a hole for my festool vacuum, but when I turn it on, the gloves go completely rigid and straight out. I drilled a small 3/8" hole on the opposite side of the vacuum to help relieve some of the pressure. I have no air filter on the gun, do I need one? When I use the blaster, the pressure is so strong, it's difficult to move my arms. Any thoughts? Thanks in advance

crownver 01-05-2013 01:17 PM

You shouldn't need a ton of vacuum power. All your doing is getting rid of the dust in an enclosed cabinet. What I did was mount a small pipe on the cabinet and just slip a shop vac over the pipe. It's sucking air around the pipe but gives enough vacuum to get rid of the dust. My cabinet also has a hole in the opposite end about 1" with a filter on it.

Ben78 01-05-2013 01:40 PM

Cool, I can turn the vacuum down lower. What kind of filter do you have on you 1" hole? Ill make the hole bigger also. Do you think i need an air filter for the gun? Thanks

crownver 01-05-2013 02:33 PM

Filter is a small paper unit. Not sure where to get one but I'm going to start looking. It's just to let air in/out without carrying dust/sand with it. Not sure what you mean by a filter on the gun. Air just needs to be dry.

jsaw 01-05-2013 08:45 PM

Sound like you need a hole to let air in to replace the air that you are pulling out with the vacuum

Ben78 01-06-2013 07:56 AM

I couldn't think of what it was called, a line dryer is what I meant for the gun. Do I need one of these if I'm using glass bead? The gun seems to work well in the beginning, but then it doesn't work as well after a few mins. Does that have anything to do with the pressure or is the glass bead getting moist? Thanks guys

DanielC 01-06-2013 08:22 AM

You need to keep the blasting media dry or it clumps up, and will not flow.
If the sand feed is suction only, if you block the nozzle of the gun, it blows air backwards through the sand feed hose, and removes the clog, but if the sand has moisture, it quickly clog again.
Sometimes suction feed needs a little adjustment on the amount of sand being fed in to the feed hose. You need air to flow in to the hose, to bring sand with it. Kind of like a carburetor, not too rich, or too lean.

You need to vent the cabinet. The gloves should inflate a little, but not go out fully stiff. You need some air flow through the cabinet, to clear the air, so you can see what is blasted, and areas missed. but too much air flow will suck good blasting media out of the cabinet.

Probably should wear a dust mask, to reduce the amount of dust you inhale.

crownver 01-06-2013 01:36 PM

1 Attachment(s)
The filter that came with the cabinet is #33 to #37. King Canada is like a Harbor Freight in the States I think. Their stuff is pretty cheaply built but is okay for light use. At the price they want for a filter I think I'll be looking for something else, like maybe a lawnmower filter or something, when I need one.

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