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Compressor for sandblaster

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Kent Petty

05-18-2003 10:27:28

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I'm in the process of restoring a few Minneapolis Moline tractors. I bought a sandblaster yesterday that, according to the instructions, uses a working pressure of 60-125 lbs...and a delivery rate of 6-25 CFM. I've looked at air compressors that claim to have 15 SCFM....can anybody explain to me what the difference is between SCFM and CFM. I need to buy a compressor that will hanble the sandblaster efficientlty but I also need to keep the investment to a minimum as this is a hobby...and not really a business for me. I guess what I'm looking for is the best buy on a compressor....big enoough to do the job...but also affordable. I would appreciate whatever input anybody might have. Thanks..... Kent

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Mike

05-20-2003 18:50:17

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Re: Compressor for sandblaster in reply to Kent Petty, 05-18-2003 10:27:28

Tom and Joe make good points.
I used about 1,000 lbs of sand to blast all the parts for a cub cadet,would have been cheaper to have the major blasting done commercially.Sometime
for the information stop at a hardware store and read the package for a good resperator, all i have seen say not to be used for abrasive blasting
,they cant filter free silica and free silica can cause a condition similar to asbestos. I'm not trying to scare you just want you to be safe.

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Kent Petty

05-21-2003 07:09:59

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Re: Re: Compressor for sandblaster in reply to Mike , 05-20-2003 18:50:17

Thanks Mike....makes a lot of sense, sometimes on these tractors though there's just so much "stuff" that needs to be taken off before going to the sandblaster that it makes the tractor inoperable....then you have to haul the dead tractor to town...and haul it back....or take the big pieces (like front ends) off and take them to town. I'm just looking for ways to make "cleaning" up these big tractors a little more practical....but I really do appreciate your input. Thanks again..... .Kent

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VaTom

05-20-2003 19:41:55

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Re: Re: Compressor for sandblaster in reply to Mike , 05-20-2003 18:50:17

Hi Mike,

It would be an exceptional hardware store that stocked good respirators. Head on down to the auto body supply shop. If they don't have the proper filter in stock, they won't have any trouble ordering it. Not cheap, but very inexpensive compared to silicosis. Once I knew what I needed for all of my respirator filtering needs, I watched ebay until I finally got lucky. Lifetime supply's sitting on a shelf here.

Other abrasive products are available to replace sand, but nobody around here stocks any.

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CNKS

05-19-2003 18:46:38

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Re: Compressor for sandblaster in reply to Kent Petty, 05-18-2003 10:27:28

I have a single stage compressor rated 17 SCFM at 90 psi, I assume your 15 SCFM is at 90-100 psi, If it is at 40 psi it is too small as SCFM is inversely proportional to psi. I have not tried a sandblaster with mine. In the size range of your sandblaster, I would guess the compressor you mentioned would run continuously, no cycling on and off, mine does that with a needle scaler that requires 90 psi. Paid about $800 for mine. I should have bought a 2 stage, rated at substantially more than 17 SCFM. Therefore I use paint stripper, and wire brushes in an angle grinder and drill.

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Kent Petty

05-19-2003 20:00:21

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Re: Re: Compressor for sandblaster in reply to CNKS, 05-19-2003 18:46:38

Hey thanks for the advice....I'm now looking at a two stage 7 HP with 16.8 cfm at 90 psi...you think that might run the sandblaster? Kent

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VaTom

05-20-2003 04:28:03

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Re: Re: Re: Compressor for sandblaster in reply to Kent Petty, 05-19-2003 20:00:21

Hi Kent,

I have an older 5 hp IR 2 stage, with less capacity, that has no trouble keeping up with my pressurized sand blaster. We've gone through a LOT of sand cleaning bar joists up to 28' long. I did replace the tiny air filter with an automotive one and change the oil regularly with compressor oil. Make sure you're careful with your (serious) respirator.

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Kent

05-20-2003 15:38:55

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Re: Re: Re: Re: Compressor for sandblaster in reply to VaTom, 05-20-2003 04:28:03

Hey..... .thanks....I appreciate the info on the compressor.

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JoeK

05-18-2003 18:19:01

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Re: Compressor for sandblaster in reply to Kent Petty, 05-18-2003 10:27:28

You simply cannot have "too much air" within the specs given.Best I could afford was a 6hp/80gal single stage delivering appx 10cfm@90 and although it gets the job done,it is barely adequate under heavy usage regulated to 75#.Just punting here but for your blaster specs,in a single stage unit,minimum would be 7.5HP.In a 2stage due to higher delivery pressure and reduction to service pressure you might get by on a 5hp.Sandblasting large objects is a long and tedious project without a commercial type blaster.Think of going over your entire tractor 3-4 times with a 1" paintbrush.Chemical strippers or contracting out the major pieces can be much more cost effective.I just finished the complete blasting on a personal garden tractor restoration much of the smaller parts done in my cabinet,and even so have almost 30hrs and $100 in sand and supplies invested.
Just tryin to get the point across for the beginner that though there is no exact substitute for blasting,its not like goin to the car wash and just blowin away the dirt.Also at higher pressures will warp and "brittlize" sheet metal.
Best of luck in your endeavors.

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Bill Paschal

05-18-2003 13:51:15

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Re: Compressor for sandblaster in reply to Kent Petty, 05-18-2003 10:27:28

Definition SCFM -- The term SCFM stands for Standard Cubic Feet Per Minute, referenced to a pre-specified pressure, temperature, and relative humidity. In most cases, SCFM is referenced to 14.7 PSIA, 68�F, and 0% relative humidity. By specifying these parameters, the mass flow of compressed air and gas systems is clearly defined.

PS - PSIA is pounds per square inch absolute. 14.7 psia = Standard barometric pressure.

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