Sandblasting nozzle using spark plugs

  1. diogofcr Member

    Messages:
    122
    Location:
    Santiago do Cacem, Setubal, Portugal
    Ok, thank you, but are they like rubber pieces to reduce the side "inside" the ball valve before the nozzle?
     
  2. Burdekin

    Burdekin Chief Bodger

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  3. diogofcr Member

    Messages:
    122
    Location:
    Santiago do Cacem, Setubal, Portugal
    Thank you, but this is a website to buy nozzles right? Bright spark had already linked me to one :P What I was asking is if there is any rubber piece that will fit inside my 1/2" ball valve so the gun doesn't jam when it get to the car spark plug because it liks a 15mm hole to 3mm and the abrasive just jams in there and stops airflow
     
  4. MBB Forum Supporter

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    748
    Location:
    northumberland
    I used to make them with cast iron window sash weights. Turn to the size you want drill hole you need down centre heat to cherry red then put compressed air down hole till cold enough to handle, don't water quench. These are harder than carbide and last longer. I had to do this when I forgot to order nozzles for a large industrial walk in shotblast unit. I only made them as a temporary fix till the carbide ones arrived but the cast ones lasted at least four times longer than the carbide ones.

    MBB
     
  5. rtbcomp

    rtbcomp Moderator Staff Member

    Messages:
    18,615
    Location:
    Sheffield UK
    If you're using the ball valve at the nozzle to regulate the flow of media you haven't got the pot set up OK, it should be either on or off.

    Turn all your valves off
    Open the nozzle valve fully (if fitted)
    Open the top air valve fully
    Open the valve at the side fully
    Slowly open open the bottom valve until you can just see the media stream coming out of the nozzle

    If you want to reduce the overall air/media flow adjust the top valve (or the regulator if you have one fitted), and adjust the bottom valve if necessary.

    It can take up to 15 seconds for the adjustments to take effect, so be patient and adjust the valves a little at a time.
     
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  6. Shox Dr

    Shox Dr Chief Engineer to Carlos Fandango

    Messages:
    13,814
    Location:
    East Yorkshire
    I found male PCL barbed fittings work a treat.
     
  7. diogofcr Member

    Messages:
    122
    Location:
    Santiago do Cacem, Setubal, Portugal
    I am not using the ball valve at the nozzle to regulate the media like you said I am using it to be on or off. But that ball valve is 1/2" and the ID is more than 10mm when I fit the car spark plug (as nozzle) the hole is like 3mm and the media gets jammed. I can send photos if you want because i am not able to explain it, I needed like a rubber piece to reduce the diameter so it didn't jam
     
  8. diogofcr Member

    Messages:
    122
    Location:
    Santiago do Cacem, Setubal, Portugal
    I am not looking for nozzles :P (but thank you for the tip) I am looking for something to reduce the diameter inside the ball valve to fit my 3mm nozzle like a rubber piece
     
  9. rtbcomp

    rtbcomp Moderator Staff Member

    Messages:
    18,615
    Location:
    Sheffield UK
    I suppose you could use a 1/2bsp to 10mm (microbore) reducer, or maybe some washing machine hose, but the best bet is to remove the nozzle valve altogether, they don't last long.

    when I fit the car spark plug (as nozzle) the hole is like 3mm do you mean the hole down the centre of the nozzle? If it's blocking it'll block no matter how you fix the nozzle into the valve.
     
  10. brightspark

    brightspark Member

    Messages:
    27,032
    Location:
    yarm
    cut the ball valve off the end of blast hose and fit jet in using a jubilee clip and operate the pot from ball valve next top water separator on inlet to pot
     
  11. diogofcr Member

    Messages:
    122
    Location:
    Santiago do Cacem, Setubal, Portugal
    Here are some pics, I tried fitting a piece of 3/8" rubber hose inside and maybe it will work, I am not sure though, it my just wear it out and still accumulate abrasive inside and jam. What do you guys think?
    [​IMG]
    [​IMG] [​IMG] [​IMG] [​IMG]
     
  12. brightspark

    brightspark Member

    Messages:
    27,032
    Location:
    yarm
    look at post 30. as I said and if it blocks up your putting to much abrasive through the hose
     
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  13. diogofcr Member

    Messages:
    122
    Location:
    Santiago do Cacem, Setubal, Portugal
    Ok, thank you. If I need more help I will say
     
  14. KemppiFrog Member

    Messages:
    3,008
    Location:
    Aquitaine
    From what I see, what the guys are telling you is that having a stop valve at the sharp end of the rig is not a good idea. Regulat the medium at the bottom of the pot and the air on the side of the pot. Cutting it on and off at the ball valve you have will leave medium in the tube, which then will rush up and clog the reduction at the nozzle.
    rtbcompt's post was the best answer. Think he has a 'bit' of experience on the subject....

    Edit: Ah, missed the last couple of posts.
     
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  15. brightspark

    brightspark Member

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    27,032
    Location:
    yarm
    here's both of mine I've been using them for 40 years no problem
     
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    diogofcr likes this.
  16. diogofcr Member

    Messages:
    122
    Location:
    Santiago do Cacem, Setubal, Portugal
    Ok so I would control it from like the quick connector valve/near the pressure regulator/water trap valve (in your case it is not a quick connector), right?
     
  17. brightspark

    brightspark Member

    Messages:
    27,032
    Location:
    yarm
    yes I use c couplings on both mine with large bore hose but if your using a 3mm jet a 10mm bore pipe will be fine using slightly larger bore connectors than the standard pcl couplings
     
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  18. diogofcr Member

    Messages:
    122
    Location:
    Santiago do Cacem, Setubal, Portugal
    Thank you
     
  19. zeppelin builder

    zeppelin builder Member

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    1,172
    Location:
    peoples republic of scotland
    you need loads of cfm even for a 6mm nozzle
     
    brightspark likes this.
  20. brightspark

    brightspark Member

    Messages:
    27,032
    Location:
    yarm
    namely 90cfm I use one :)
     
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