Blast Gun - Secret - Team Camaro Tech
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post #1 of 18 (permalink) Old Feb 17th, 13, 03:25 PM Thread Starter
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Alex
 
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Blast Gun - Secret

Can someone enlighten a 1st time restorer regarding the secret in not stopping up a sand blast gun? I've tried two different ones at varying pressures... still can't go more than 10 - 20 seconds without stopping up. I have the water traps, etc. in place, media (sand and / or black diamond) is new and / or filtered. Is one brand of gun better than another?


Tips?

HELP!
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post #2 of 18 (permalink) Old Feb 17th, 13, 04:23 PM
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Al
 
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Re: Blast Gun - Secret

Alex, I'm pretty sure this is going to get moved to the tools or body shop
forum. We need more info. Are you talking about a siphon or pressurized
system ?
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post #3 of 18 (permalink) Old Feb 17th, 13, 04:48 PM Thread Starter
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Re: Blast Gun - Secret

My bad... siphon.
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post #4 of 18 (permalink) Old Feb 17th, 13, 04:55 PM
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Re: Blast Gun - Secret

How is the air system filtered, and are the larger sand particles getting stuck in the ceramic nozzle?
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post #5 of 18 (permalink) Old Feb 17th, 13, 05:19 PM
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mark
 
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Re: Blast Gun - Secret

What size media And what siphon gun are you using?

68 originally ss (straight six) 406,Afr210,Bullet solid roller,rpm airgap,QF750,th400,3.73 Eaton posi.11.02 @ 122.74
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post #6 of 18 (permalink) Old Feb 17th, 13, 05:30 PM
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Al
 
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Re: Blast Gun - Secret

Alex, It is an absolute requirement to have dry air when blasting. Many people
install a water trap at the compressor outlet followed by rubber hose. Not a
good idea. The air coming out of the compressor is quite hot. The air must
travel at least 20' through steel pipe to have a chance to cool down reducing
condensation. Then you need a filtration system. Other than dry air, tip size is
quite important in a siphon system. Also, just as with a pressure system, don't
hold back the trigger. It's full blast or nothing. CFM is also important. Give us
the complete run down on your system please.
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post #7 of 18 (permalink) Old Feb 20th, 13, 09:56 AM Thread Starter
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Alex
 
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Re: Blast Gun - Secret

THNX everyone. Running a 5.9 CFM, 30 gallon (small'ish I know) with two 20' sections of hose and a water trap on the gun end.

In reading around I'm wondering if I've recycled my media one too many times (used it twice, mixture of black diamond and sand). Everything worked fairly well until the last week or so.

Prio, the gun would stop up on me here and there... but now, about every time I pull the trigger the gun stops up.

So close to having the undercarriage ready to refinish..... yet so far!

THNX
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post #8 of 18 (permalink) Old Feb 20th, 13, 02:57 PM
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Re: Blast Gun - Secret

To me sounds like inadequate pressure.

capt
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post #9 of 18 (permalink) Old Feb 21st, 13, 06:48 AM
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Re: Blast Gun - Secret

Do you sift your media thru window screen when you recycle it? I've had more trouble with debris than I've ever had with water. Most of my experience is pressure but have siphon in my cabinet.


Jeff
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post #10 of 18 (permalink) Old Feb 21st, 13, 07:49 AM Thread Starter
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Alex
 
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Re: Blast Gun - Secret

I do sift through a screen purchased from one of the suppliers who specialize in such things. PSI runs at ~85 at it's lowest. I'm going to try new media this weekend. Hoping I've just exceeded the recycle limit on my media.
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post #11 of 18 (permalink) Old Feb 21st, 13, 01:03 PM
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Al
 
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Re: Blast Gun - Secret

Quote:
Originally Posted by Nomad 67 View Post
Is one brand of gun better than another?

YES!! I have a Harbor Freight bench top blast cabinet - the supplied gun clogged constantly. Swapped that out for one I had laying around (unknown brand) and it only occasionally clogs.

Harbor Freight pressure blasters will test your patience also.
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post #12 of 18 (permalink) Old Feb 21st, 13, 02:46 PM
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Re: Blast Gun - Secret

When pressure blasting and the media exceeds it's lifespan it gets real fine and dusty. It also seems like it doesn't work as well or fast. In the cabinet it seems like it stays in there forever and still works. I had a screw become lodged in my pick up tube in the cabinet once, reeked havoc on the operation and tough to figure out.
I use a gun from TP tools in the cabinet with the small orifice nozzles with a 3 horse 60 gal compressor (about 12CFM).

Jeff
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post #13 of 18 (permalink) Old Feb 21st, 13, 05:33 PM
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Re: Blast Gun - Secret

Does it have different size tips ? maybe go to the next size up. I had to do this on a pot blaster. On my friends snap-on blast cabinet ,never have a prob, but the tips do wear out over time.
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post #14 of 18 (permalink) Old Feb 22nd, 13, 08:36 AM
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Re: Blast Gun - Secret

Here are a couple examples, I think I bought the one from harbor freight, seems I have a bunch.

http://www.tptools.com/p/3394,390_Ty...zles-3-Pk.html

http://www.harborfreight.com/pack-of...ives-3373.html

Jeff
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post #15 of 18 (permalink) Old Feb 22nd, 13, 01:19 PM
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Al
 
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Re: Blast Gun - Secret

Alex, My blast cabinet is a siphon style. It's a cheap HF type and the original gun was pretty much junk. I replaced it with a Campbell Hausfeld I picked up at my local Tractor Supply Store for about $25. Had to buy the kit to get the gun. I use 3/16 tips, Black Diamond 30/60 media, high flow air connectors, air dryer (steel piping) and filtered air system. I also have about 10 scfm. (and that's marginal). I have no problems with it clogging up.
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