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Post by midlifecrisisrd on Jul 17, 2016 21:05:47 GMT 1
Toying with buying a compressor as thinking of buying a small ish blast cabinet and possibly a bit of spraying
So far I'm looking at sealed 3hp twin cylinder set ups but unsure of what sise receiver.
50, 100 or 150
Steve
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Post by rigga on Jul 17, 2016 21:27:25 GMT 1
The biggest you can get, smaller tanks will not be able to keep up with demand, and slightly too small will be running constant, and in a confined space they are loud when in operation.
Think mines a 50 and for hobby stuff its just adequate.
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Post by jon on Jul 18, 2016 7:36:02 GMT 1
Blast cabinets consume vast amounts of air.
Don't be fooled by the fact that it's only a small cabinet, as it will use just as much air as a bigger one.
I use a 3HP 14CFM compressor on mine, and it's barely adequate. You have to keep stopping to let the tank refil.
A larger tank wil only last a very short time before the compressor has to re-pressurise it. It also takes up a lot of room.
I'm lucky enough to have two of these, so twin them together if I have more than the smallest part too blast.
Jon
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Dave B
Drag-strip hero
Posts: 240 
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Post by Dave B on Jul 18, 2016 8:37:11 GMT 1
I agree, you need at least 14 CFM- which is what I have.
The powdercoaters near here have a huge Rotovane compressor with a tank the size of a 40 gallon drum. The compressor still runs all the time they are blasting.
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Deleted
Deleted Member
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Post by Deleted on Jul 18, 2016 9:07:12 GMT 1
yep 14 cfm at least, mine is only a 7 and the blasting tool I have states that as its minimum, the compressor runs all the time at low pressure, still I'm in no hurry to sand or soda blast things so its not an issue for me to wait until the tank is full
Good idea though on the two compressors
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Post by jackjabba on Jul 18, 2016 9:25:44 GMT 1
As already said, get the biggest you can get. I have a 150 receiver and it still runs most of the time.
Hydravane scroll pumps are the way to go, but cost is very high, Look around for a used one.
To get a decent system you need to look at getting a 3 phase supply to your garage.
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Post by JonW on Jul 18, 2016 13:28:45 GMT 1
Most mfrs lie when they quote CFM/LPM sadly so beware of that. Also bear in mind that the receiver means its runs to fill the receiver back up as soon as the pressure drops, and large receivers need the pump to run longer. Check out the duty cycles on the pump/motor in the specs and also get a belt drive and not direct as they are less noisy and last longer. Run a fan over the compressor on hot days and build in drop legs of pipe if you want to paint, and the run lots of filters too. Its humid and hot here so we do lots of that, but the same stuff works everywhere. Whatever you do, spend a bit more for quality if you want it to last, anyone who has a decent compressor started with a cheap direct drive unit and killed it and then dug deeper, save your money and learn from our mistakes  |
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Post by sunbuilder on Jul 18, 2016 16:27:32 GMT 1
absolutely as big as you can get
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Post by risolc on Jul 18, 2016 17:38:53 GMT 1
I have a Clarke 14 cfm compressor (V twin layout)with a 50 litre tank running a cheap blast cabinet,when in use the compressor is going constantly.
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Post by shandyboy on Jul 18, 2016 20:38:04 GMT 1
Yup I use A Clarke industrial 18cfm with 200 litre tank. painting is ok and blast cabinet works ok  Think this is the biggest set up on house electrics bigger than this then you in the reams of 3 phase |
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Post by bare on Jul 19, 2016 3:31:14 GMT 1
As Above: Absolute Minimum for a even a tabletop Blast Box is 17cfm More is definitely 'better'
Gets spendy though... and too often one get into 3 phase power feeds. OR goes for Honda Gas engine power :-)
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