Joys of glass blasting

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • LoserShoes
    XSive Maximus
    • Apr 2005
    • 524
    • Bangor Maine

    #16
    I think the siphon feed takes quite a bit more CFM then the pressure feed.
    I have a Harbor Freight blast cabinet and a Devilbiss 6 hp 2 stage compressor, and with a large nozzle that compressor is pretty much running flat out after a couple of minutes. It will keep up at 90psi, but barely.

    Steve
    80 XS1100G Standard - YammerHammer
    73 Yamaha DT3 - DirtyHairy
    62 Norton Atlas - AgileFragile (Dunstalled) waiting reassembly
    Norton Electra - future restore
    CZ 400 MX'er
    68 Ducati Scrambler
    RC Planes and Helis

    Comment

    • RiskyBusiness
      Truly XSive
      • Mar 2003
      • 174
      • Richmond, Virginia, USA

      #17
      It makes some sense that the siphon type uses more air pressure. I think the air to media mix on the pressure pot type should be lower meaning that it takes less air volume for the same amount of aggregate. I am running a MUCH smaller compressor. I got the largest compressor that I could run off of 110. I didn't want to mess with wiring up 220 in my shop.
      1979 XS1100 Special with 81 carbs

      Richmond, Virginia, USA

      Comment

      • prometheus578
        XS-XJ Super Guru (RESIGNED)
        • Aug 2004
        • 4012
        • Olympia , Wa.

        #18
        I think you're right about the higher pressure use. I have a 30 gal compressor with a hose connecting it to the tank of a 60 gal compressor (motor fried), which gives me a large reserve. Sure, takes a little longer to fill both tanks, but with the extra reserve, compressor gets a longer rest between cycles. (At least that was my theory)
        "Damn it Jim, I'm a doctor, not a mechanic!' ('Bones' McCoy)

        Comment

        • RiskyBusiness
          Truly XSive
          • Mar 2003
          • 174
          • Richmond, Virginia, USA

          #19
          Just to clarify what I typed above, I really spoke without precision. The issue is the volume of air needed for siphon vs. pressure pot. I hate when compressor makers label their machines with useless big letters that read “150 PSI.” I have a bicycle hand pump designed for high-pressure road tires that will pump a pressure of 150 PSI. What matters for blasting is the volume; typically measured in CFM.

          The siphon type uses a higher volume of air for a given amount of media.
          1979 XS1100 Special with 81 carbs

          Richmond, Virginia, USA

          Comment

          • prometheus578
            XS-XJ Super Guru (RESIGNED)
            • Aug 2004
            • 4012
            • Olympia , Wa.

            #20
            Agreed.
            "Damn it Jim, I'm a doctor, not a mechanic!' ('Bones' McCoy)

            Comment

            Working...