air comp. ?
I want to build an air comp. just for sand blasting [I do a lot of it]. I have a 40 gal. tank and a 3 hp 240 V motor. a friend gave me a 2 stage pump. I am almost sure it needs rings and reed valves. it has no ID on it, so must be a China. looks to be a 3" 1st and a 2" 2nd with maybe a 2 1/4/1/2 stroke. fairly sizable, & a 14" flywheel. probably cost $100 for parts and a lot of time.
I can get a brand new Harbor Ft pump, 2 cyl, 145 PSI [uses a 3 hp motor] for $112 + tax, and ready to put on. my question is, what is the benefit of a 2 stage over a 2 cyl. single stage? Thanks Rod in AZ |
Re: air comp. ?
Do you know how many CFM the sand-blaster requires to operate properly? That will give you the best idea when building an air compressor. You usually want a unit that is at least capable of providing 1.5 times the air volume your tool requires and a large enough tank to keep the pump from having to exceed its duty-cycle rating. The two-stage units most often have a higher pressure rating than the single-stage units do, but for tools that use a lot of air (like a sand-blaster) the SCFM ratings are much more important.
I see the pump you are talking about in the new Harbor Freight catalog that arrived this morning, but it doesn't list a SCFM rating. You'll need it to make a decision. Good Luck! |
Re: air comp. ?
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