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Old 04-17-2010, 02:30 PM   #1 (permalink)
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Blast cabinet CFM requirements?

Looking at buying one of these, used.
http://www.manusabrasive.com/e_series.html


Went to test it today and can't seem to get it working properly.

Air pressure goes up to 100-110 psi when airline is connected, but as soon as you press the pedal PSI drops to pretty much zero and doesn't go up unless you let off the pedal?
There is also a seperate air line with a simple blower attachment nozzle to blow off sand when done. This one does the same thing and will not "hold pressure"
Compressor is sitting at 120Psi.

Compressor is 60gal. rated at 17.1 acfm @100 psi

At first I thought maybe 17 cfm wasn't enough, but the compressor guage isn't dropping and the blaster nozzle is only putting out a light breeze of air.

Then I noticed the actual "air requirement" for this model on the above website, 15-63 CFM @80Psi depending on the nozzle. The one installed was big.

The main airline coupling was rusted and we had a hard time breaking the end free just to connect it to the machine, could that be the issue?
Or not enough CFM? or something else?
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Old 04-17-2010, 02:33 PM   #2 (permalink)
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Quote:
Originally Posted by mr.frenchy View Post
Looking at buying one of these, used.
http://www.manusabrasive.com/e_series.html

The main airline coupling was rusted and we had a hard time breaking the end free just to connect it to the machine, could that be the issue?
Or not enough CFM? or something else?
yes use 3/4in air line
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Old 04-18-2010, 02:43 PM   #3 (permalink)
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Looks like a pressure regulator on the left front leg. Can you adjust it?

If not just put a pigtail on the foot control and externally regulate the pressure.

As a second reference, look at the requirements of the Scat Blasters on TPTools.com. It may help corroborate your numbers and assumptions about what is going on.

Good luck!
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Old 04-19-2010, 07:24 AM   #4 (permalink)
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Sounds like a restriction between the compressor tank and the machine.
Had a shop bitching about thier worn out air compressor because it couldn't run their 3/4" impact in the back bays.
1/2" pipe was coroded almost shut!
After plumbing with the cool 1/2" alminum air line (manufacturer claims more air flow than 1 1/2" black pipe due to smooth inside of tube), all of a sudden the air compressor is just fine !!!!
I bet if you can get the air flow to the machine it is just fine.
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Old 04-19-2010, 02:42 PM   #5 (permalink)
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Quote:
Originally Posted by dopeassjackson View Post
yes use 3/4in air line
this.

And don't forget to make sure it's 3/4" all the way in to the compressor.

Even if it pulled 63cfm, your tank should have allowed a short burst of abrasive goodness. IF the air could have gotten out fast enough.
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