+1 for kelco.
I have a ch30 pressure blast cabinet, with 15hp of air compressors feeding it.
If this is a hobby a suction fed gun can provide adequate blasting rates, however if this is to make money you need to buy something with a pressure pot built in. The pressure pot is a more efficient blasting method AKA you will sandblast faster with a given amount of air.
The pressure pot units typically come in two flavors.
one with a pot located directly below the hopper, so the media falls back into the pot when the pedal is released. These typically have a dust collector built directly into the cabinet.
Pros: simplicity, there is one moving part on the entire unit. small footprint units
Cons: Blasting pressure takes a few seconds to build, and about 10-15 seconds to bleed down once the pedal is released. The media isn’t fully filtered so dust will tend to accumulate within the media as it breaks down. Basically the dust collector is just cycling air through the unit.
Units with a remote mount pot and a separate dust extraction/separator unit.
Pros: better media filtration, this can be useful when blasting with a media that breaks down quickly. All of the blast media is sucked out of the cabinet and ran through a cyclone separator. The good media is dropped back on top of the pressure pot, the dust is sent to a dust collector. Also the foot pedal is more responsive because the pot is always pressurized, and they use a pneumatic pinch valve to turn the flow on and off.
Cons: way more complicated, there is a pneumatic circuit which controls pot pressure and media flow with a series of pneumatically actuated valves. When they break they can be a PITA to troubleshoot and there are more wear items. More floor space.
Personally I would go with a kelco, phenomenal build quality, dead simple operation, good technical documentation and a parts guy that actually picks up the phone.
Oh, don’t forget about dry air.
My 2 cents.
Kelco CH36C Pressure Blast Cabinet | eBay
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