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Tool Talk Discussion Forum

Sand Blast

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Bob Caesar

12-04-2005 16:22:50




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I have a good sandblast cabinet (TP Tools), but sometimes need to clean steel greater than 48" wide, up to 8' to 12'. Guess I need an "outside" blaster? I think? Are there pressure tanks and siphon blasters? What should I look for? All advice will be rewarded with six million dollars -and thirty virgins in the "afterlife":-)

Thanks! Bob




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david - OR

12-05-2005 06:56:05




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 Re: Sand Blast in reply to Bob Caesar, 12-04-2005 16:22:50  
Chinese pressure pots are available from Harbor Freight, etc. These come in 40 and 90 pound sizes. They lack the "deadman" nozzle valve required by OSHA, but are OK for personal use.

Use a purchased abrasive, such as Black Beauty or Vitro-Grit, instead of beach sand. This will eliminate the clogging problems, and also avoid the silica dust health hazard.

With good abrasive, the pressure pots work far better than the siphon blasters. You'll need 10 to 15 continuous CFM. Find a place outside where the blowing sand will not be a problem. Open the nozzle valve fully. Adjust the sand valve at the bottom for a "lean" mix. Do not try to throttle the output at the nozzle, this valve must be either full open or full close. You will still wear out the nozzle valve about every 10 hours. But the 3/8 NPT threaded ball valve is available at any hardware store.

The pressure pot works well for bulky items, like a tractor hood, but I would not want to try to use one to strip a whole car. Too slow....

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Dale B

12-04-2005 19:28:57




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 Re: Sand Blast in reply to Bob Caesar, 12-04-2005 16:22:50  
I also recommend the wet blaster. I bought it from Northern Tool. I had the best results putting the sandbag above the level of the wand, got smoother flow of sand that way.



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DickTN

12-04-2005 17:16:35




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 Re: Sand Blast in reply to Bob Caesar, 12-04-2005 16:22:50  
Bob, If you have a pressure washer, you might try wet sandblasting. Northern Tool and I'm sure others, sell the sand lance that you will need. It works for me. Of course, you can't reclaim the sand and the metal tends to "flash rust", but that can be removed easily with a wire brush. HTH



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RustyFarmall

12-04-2005 17:00:56




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 Re: Sand Blast in reply to Bob Caesar, 12-04-2005 16:22:50  
Siphon blasters really don't work very well for big stuff, they'll get the job done but are painfully slow. A pressure blaster is the way to go. I'll be expecting three million dollars, you can pay the rest when I enter the "afterlife" and I wouldn't know what to do with the virgins.



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jerrycpp

12-06-2005 12:00:53




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 Re: Sand Blast in reply to RustyFarmall, 12-04-2005 17:00:56  
I think you are going on a common mistranslation. It's 77 URCHINS, not virgins.



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Miss Grundy

12-05-2005 01:28:19




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 Re: Sand Blast in reply to RustyFarmall, 12-04-2005 17:00:56  
Be kind to them and treat them like ladies



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