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Old 11-21-2013, 05:32 PM
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Blasting Small Parts

I'm in the process of trying to restore a '66 Mustang and I have a few used parts I'm trying to clean up and reuse. I've been trying to blast a few things in m cabinet and sometimes it works fine and sometimes it doesn't. I don't seem to have constant pick up. At times, I put the gun to the glove and I can feel air, but no media is coming out. The cabinet calls for 80 grit or smaller media and I'm using medium grit which I believe may be a little bit larger than that. The compressor a one stage 3.7hp, set at 100 psi, and puts out SCFM @ 40 PSI 13.4, and SCFM @ 90 PSI 11.5. The pick up line lies in the bottom of the cabinet and I'm sure that media is there to be picked up. Any ideas on how to improve pickup to get a better blast?
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Old 11-21-2013, 06:03 PM
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blasting

yrs ago i have a similar problem. i just put the glove over then nozzle end to blow back air into the cabinet, let go and blast away.. but i think u may have thought of that one..
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Old 11-21-2013, 06:14 PM
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You really need to make sure your air is DRY! My blaster plugs when the media is picking up moister
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Old 11-21-2013, 06:36 PM
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Quote:
Originally Posted by Mac88 View Post
I'm in the process of trying to restore a '66 Mustang and I have a few used parts I'm trying to clean up and reuse. I've been trying to blast a few things in m cabinet and sometimes it works fine and sometimes it doesn't. I don't seem to have constant pick up. At times, I put the gun to the glove and I can feel air, but no media is coming out. The cabinet calls for 80 grit or smaller media and I'm using medium grit which I believe may be a little bit larger than that. The compressor a one stage 3.7hp, set at 100 psi, and puts out SCFM @ 40 PSI 13.4, and SCFM @ 90 PSI 11.5. The pick up line lies in the bottom of the cabinet and I'm sure that media is there to be picked up. Any ideas on how to improve pickup to get a better blast?
Most siphon feed cabinets need the feed line to the gun purged periodically. To clear picked up debris and moisture.

Put your finger over the nozzle to block it off and pull the trigger. Media will be blown back into the hopper. Then resume work. The gun will work like new.. Till next time..
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Old 11-21-2013, 07:03 PM
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Are you recycling the sand? Could be that you have particles that are blocking the pickup tube. And further to emphasize.......USE DRY GRIT!
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Old 11-21-2013, 07:24 PM
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air bleed ?

I have had to cut a small air bleed hole in the sand pickup tube near the bottom It works like a gold dredge, you need a constant flow thru the tube. If it doesn't help you can tape it over.
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Old 11-22-2013, 10:48 AM
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like others have mentioned put your finger over the end and give a short blast of air to flush the gun
more import clean the junk out of your hopper and throw it away, sand is cheap.
we use the $4 per bag sifted sand from home depot, they have coarse and fine.
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Old 11-23-2013, 08:55 PM
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I have to tell you, get some Black Diamond and you will never use sand again! Sand is for boxes. ("Sandbox" get it? )

It has no silica so it is MUCH safer (breathing silica is DEADLY)

Black Diamond Blasting Abrasive | Blasting Media| Northern Tool + Equipment

Tractor supply also sells it.

Brian
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Old 11-24-2013, 06:02 AM
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^^^ X's2 ^^^
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Old 11-24-2013, 05:38 PM
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Yes,I purge the line by putting my gloved finger over the tip and pulling the trigger. I also use Black Diamond.I bought mine at Tractor supply last week for$7.79,for a 50 lb bag. The local lumber yard wanted $7.95 for a 50 lb bag of silica sand.
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Old 12-10-2013, 08:24 AM
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Old post I know; but we had a problem with our cabinet at work. We now use black diamond and most of the problem went away, I added a small hole to the siphon tube and a dessicant in-line. Also, I dont use my finger to backflush; I keep a small scrap block of wood in the cabinet. Call me a nervous nelly.
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Old 12-18-2013, 05:51 AM
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I just bought myself a HF 40lb. Cabinet for christmas.
I WAS going to just dump my regular old sand in it.
But, I think I may just pony up and buy some good stuff.

I need to look up some info- tips/tricks for these cheap HF cabinets
Maybe I can save myself some time/headaches.
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