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Tool Talk Discussion Forum

cfm`s needed

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R.J.

09-28-2006 20:55:45




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Am planning to buy a air compressor to operate a 80 lb pressure sand blaster. Want one that will max out at approx 175 lbs and approx 7.5 hp. how much cfm`s do i need to maintain and at what pressure? also got any ideas on brands.

thanks R.J.




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fzbcheve

09-29-2006 17:09:28




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 Re: cfm`s needed in reply to R.J., 09-28-2006 20:55:45  
We have a Campbell Hausfeld unit on a 60 gallon tank. It is a -V- four single stage with 135 lbs l6.7 cfm at 90 psi 230 volts.We use a 3/l6" tip in the sand blaster and it will cycle. Recomend the cermanic tips. Cost about $800.00. Its also available with 80 gal tank. Made in USA.



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upred

09-29-2006 07:31:03




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 Re: cfm`s needed in reply to R.J., 09-28-2006 20:55:45  
I have a Husky air compressor (7.0 hp, 80 gallon, cfm @ 90psi, 220 volt) and a TP tools 960 blast cabinet. I like the cabinet, BUT the compressor is a little undersized. My brother has an IR unit 23 cfm and it is much better, volume and unit quality wise. Mine sounds like it is really working hard when running, his sounds quieter and smoother, better quality. I would spend the $600 more and buy the IR if I had to do it again

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CNKS

09-29-2006 06:01:56




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 Re: cfm`s needed in reply to R.J., 09-28-2006 20:55:45  
Minimum 15 cfm@90 psi (60 gallon single stage) 5 true HP, less than $1000 -- better 24 cfm@90psi (80 gal 2 stage) 7.5 true HP, about $1500. This will give you progress you can actually see. You really need about 50 cfm to get done in a reasonable amount of time. Commercial people generally use 300-600 cfm and up. Buy quality, you won't regret it.



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Fluid power guru

09-29-2006 05:21:47




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 Re: cfm`s needed in reply to R.J., 09-28-2006 20:55:45  
first off a piston compressor will give you about 3.5 CFM per HP. All you really need to do is figure out how many CFMs your tools will use and add in a fudge factor, like 50% and then pick out a compressor. A large sand blaster will likely gulp down 10-20 CFM at 80psi inlet pressure. If it were me (for a garage shop) I would try to get a 5hp or 7.5HP campbell hausfeld or a IR compressor. 220VAC 2stage.

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Don c

09-29-2006 03:57:21




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 Re: cfm`s needed in reply to R.J., 09-28-2006 20:55:45  
Go to this site TPtool.com



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jeffcat

09-28-2006 22:56:25




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 Re: cfm`s needed in reply to R.J., 09-28-2006 20:55:45  
Most everything on a blaster will depend on the size of your blasting tip. The second weekend of October is Hershey car show time. I am going and will see the Blaster Guy out there. He has several sizes of tips that are made with a VERY hard ceramic and they blast like no ones business. They are also easy on the air for most of there life. His 800 number is printed on the tip and I will look it up for you. If you are only useing the small tip that is about the size of a fat pencil you have about three choices of hole size. I use the middle size with fine blasting sand. I can hold 75 lbs with about 11 cfm. I am also running the blaster with the air mix a little to the lean side. When you look at a blaster see what the cfm is listed as and then add a little to it. Electric compressors are not the way to go if you want to do a lot of blasting. Go to your local rental center and try out a couple of size gas units. Most places start at 100 cfm and then 125 and then 150+. Electric size to do that is like off the scale in price and you ani't got the power to your place anyway. If you can find a good used gas unit like above or even by a used one from the rental center. Lots of time they unload at the end of the season. Shop around you just might luck out. My two cents. Jeffcat

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Glenn F.

09-29-2006 04:54:45




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 Re: cfm`s needed in reply to jeffcat, 09-28-2006 22:56:25  
I agree. I too have the ceramic tips yur refer to. If a person is gonna do serious sandblasting, like entire auto undercarriages, etc. no electric compressor you or I will ever own will do the job.

Glenn



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old

09-28-2006 21:30:32




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 Re: cfm`s needed in reply to R.J., 09-28-2006 20:55:45  
Well can't help much but my compresser which is a big one and has a 6 hp motor doesn't keep up with either of my sand blaster, maybe its like me gewtting old but go as big as your back pocket can go and then you will want more. BTDT and I know what I have is ok but I sure could use a lot more

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larry in tn

09-29-2006 02:14:52




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 Re: cfm`s needed in reply to old, 09-28-2006 21:30:32  
I agree with "Old's" assessment that deeper and bigger pockets surely simplify things like having the proper tool for the job. However, such convenience takes all the adventure out of life.(Yeah, Right!)I'd say the average home workshop has a compressor that is in the 3 to 7 hp range and supplies 3 to 6 cfm. You can do a surprising amount of work with compressors in this size range.

I collect old compressors but for all my actual compressor needs I've used the same old Sears unit for years. Started out as a 3.5 hp unit until the motor smoked. Went to a 5 hp motor cause I had one. The pump has started pushing to much oil into the tank so I've collected enuff parts to rebuild the old devil. The noise and the smoke are both part of the fun.

www.oldduggy.com

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