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  1. #21
    Join Date
    Mar 2011
    Location
    torrington, connecticut
    Posts
    22

    Default

    you do realize that we are talking about welding on a pressure vessel with incredibly questionable welds shown so far! please procede with utmost caution as you are creating a bomb for the hobbyist.

  2. #22
    Join Date
    May 2011
    Location
    midwest
    Posts
    13

    Default

    I've built a few of these back in the 80's. They are a very useful tool, especially prepping material for welding.

    I extended the arm of the bottom feed valve so that it can be nudged w/ a foot or is easier to adjust while wearing gloves.

    I have built a few of these and never used a rubber gasket. It could be that your pipe fitting warped from welding.

    One needs to take precautions when cutting or welding on a propane tank; not for the amateur. Freon tanks also work and are more portable.

    When using these you need a supply of DRY air. Moisture will cause sand to clog.

    Keep in mind that there are inherent dangers in welding and danger in sandblasting.
    Sandblasting can cause silicosis, and many novice types will not use proper ventilation/respiration precautions.
    By the way, you'd be surprised at the damage you can do to equipment from dust particles floating in the air or how far the sand can travel and still damage automotive glass. If it can damage automotive glass..... it may also pose a rick to your eyes as well. Use proper safety equipment. You wouldn't weld without a welding helmet; RIGHT.... ?
    A word to the wise....

    Willy
    Last edited by ~willy; 06-21-2011 at 07:53 AM.

  3. #23
    Join Date
    Sep 2006
    Location
    Abilene, Texas
    Posts
    639

    Default

    Quote Originally Posted by cws612 View Post
    you do realize that we are talking about welding on a pressure vessel with incredibly questionable welds shown so far! please procede with utmost caution as you are creating a bomb for the hobbyist.
    My thoughts exactly. It works but it's a bomb.
    Jim

  4. #24
    Join Date
    Jun 2008
    Location
    Mount Clemens,Mi
    Posts
    350

    Default

    All of the import type models use an O-ring around the pipe filler neck for a seal. DRY air is more important for free following media.
    Followed by a clear hood window and a great respirator.
    As silicious effect on your lungs is cumulative, and it doesn't take much to cause you problems. And end up joining the oxy bottle brigade at Wally World.

    And if you are using the deadman type import valves, HF is now selling the complete unit handle part for around $15.00 And if you are having a hard time finding the replacement rubber block with the alloy plate Tractor Supply sells them under their job smart brand.
    Abrasive Blasting Deadman Valve with 4 Ceramic Nozzles HF Item # 92189

    And one final thing, during the high humidity months, Don't fill the tank all the way up. And empty the media tank between uses if you won't be blasting weekly. As it will cake up at the outlet and in the fittings at the outlet/hose area.
    Last edited by PTsideshow; 06-22-2011 at 05:31 AM.
    glen, If your not on the edge, your wasting space

  5. #25
    Join Date
    Feb 2008
    Location
    Western NY State
    Posts
    41

    Default Sandblaster

    I have a similar kind of rig and found that a tank pressure of 10-20 psi seems to feed a good quanity of sand. However it may be too much. What pressure setting are you using on the tank? Does the sand grit get into the feed valve you have on the tank outlet? I don't have a valve like that. Does it work well to control the amount of sand?
    Bill

    Miller Mig 130XP
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  6. #26
    Join Date
    Sep 2005
    Location
    16919 Pole Rd. Brethren, MI 49619
    Posts
    4,412

    Default

    Quote Originally Posted by Tim B View Post
    very cool project! have you ever thought of using 2 20lb bottles and cutting one in 1/2 and cutting the ends off another the take the 2 1/2 pieces and weld them on the section you cut the ends off then you will have more capcity. just a thought
    How about a 40# bottle, would save the cutting/weld.

  7. #27
    Join Date
    Feb 2010
    Posts
    27

    Default

    Quote Originally Posted by Sberry View Post
    How about a 40# bottle, would save the cutting/weld.
    i can't find a steel one

  8. #28
    Join Date
    Nov 2011
    Location
    Toronto
    Posts
    4

    Default

    Nice Bomb. With the quality of those welds, keep your children away from that unit. This is a PRESSURE VESSEL. Unless you've had training for welding on pressure vessels, I wouldn't dare weld on any pressure tank without training, especially a repurposed propane tank. At least get your bomb hydro tested, I doubt that those questionable welds will hold up and over time expect them to fail. It may work once, twice or even 10 times, but be prepared for that thing to blow up and when it does, the shrapnel flies, remember your dealing with COMPRESSED air If you don't care about yourself, that's ok, just don't subject your kids or friends to it. Do yourself a favour and go get a professionally made unit. The $100 that you're saving could cost you or your loved ones your an eye, an arm, leg or even your life. Don't mess with compressed air, even 10 psi can cause an incredible ammount of damage. And then come the lawsuits....
    Acklands (Miller) N-250-HF
    Lincoln 180c
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    O/A

  9. #29
    Join Date
    Nov 2003
    Posts
    3,261

    Default

    Doncha just love it when someone digs up an ancient thread and gets into a debate with it????...........
    .

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  10. #30
    Join Date
    Nov 2011
    Location
    Toronto
    Posts
    4

    Default

    glad that YOU approve
    Acklands (Miller) N-250-HF
    Lincoln 180c
    SG100 Spoolgun
    Lincoln Pro Cut 55 Plasma
    O/A

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