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  • Air Compressor takes a nap

    My air compressor as decided to lay down on the job and I have a small aluminum job coming up this weekend so I'll be needing the plasma. I've searched and read but I still can't find a answer. I'll be hooking up a cylinder of compressed air. Lws pointed me toward med air. Its cheap and readily available. My question is how long would I expect this cylinder to last? Its a 335 cubic ft. Is it feasible or do I need to go ahead and bite the bullet and repair the compressor? $$$$
    Syncrowave 350lx
    XMT 350 CC/CV
    S74DX Feeder
    30a spoolgun
    Hypertherm 1000 g3
    Harris O/A
    Cincinnati lathe
    Acer Ultima "Bridgeport Mill"
    340hp Quincy and 400 gallon of air
    Other doodads and a stoker coal stove

  • #2
    Originally posted by sledsports View Post
    My air compressor as decided to lay down on the job and I have a small aluminum job coming up this weekend so I'll be needing the plasma. I've searched and read but I still can't find a answer. I'll be hooking up a cylinder of compressed air. Lws pointed me toward med air. Its cheap and readily available. My question is how long would I expect this cylinder to last? Its a 335 cubic ft. Is it feasible or do I need to go ahead and bite the bullet and repair the compressor? $$$$
    335 cf @ what PSI..??

    your plasma consumes how many CFM @ 60?? PSI..?? (60 is a guess... give us your real number)

    then we will have to find the calc to figure the conversion..

    how much cutting do you need to do??

    What is the matter with your compressor??
    Last edited by H80N; 02-25-2014, 07:47 PM.
    .

    *******************************************
    The more you know, The better you know, How little you know

    “The bitterness of poor quality remains long after the sweetness of low price is forgotten”

    Buy the best tools you can afford.. Learn to use them to the best of your ability.. and take care of them...

    My Blue Stuff:
    Dynasty 350DX Tigrunner
    Dynasty 200DX
    Millermatic 350P w/25ft Alumapro & 30A
    Millermatic 200

    TONS of Non-Blue Equip, plus CNC Mill, Lathes & a Plasmacam w/ PowerMax-1000

    Comment


    • #3
      too many variables are missing to think of something...

      what makes you think your compressor will be $$$ ?

      the air cylinder is a what pressure ? 2200, 2500 if it's the case it should last about the same time an oxy bottle, what is your post flow time on your plasma, pressure required for your alu. thickness...ahhh so many questions.

      a guy stuck in the fields would think of stealing air from a large truck tire...

      darn...hn80 beat me to the finish line lol

      Comment


      • #4
        OK, you guys got me. I have no idea what PSI is in a Med air cylinder because I've never messed with one. My plasma says 6.7scfm @ 90psig. I'm cutting some 6"x 5/8" flat stock. Be about 16 square cuts total. I know the compressor is gonna cost $$$$ cause its a Quincy.
        Syncrowave 350lx
        XMT 350 CC/CV
        S74DX Feeder
        30a spoolgun
        Hypertherm 1000 g3
        Harris O/A
        Cincinnati lathe
        Acer Ultima "Bridgeport Mill"
        340hp Quincy and 400 gallon of air
        Other doodads and a stoker coal stove

        Comment


        • #5
          Originally posted by snowbird View Post
          too many variables are missing to think of something...

          what makes you think your compressor will be $$$ ?

          the air cylinder is a what pressure ? 2200, 2500 if it's the case it should last about the same time an oxy bottle, what is your post flow time on your plasma, pressure required for your alu. thickness...ahhh so many questions.

          a guy stuck in the fields would think of stealing air from a large truck tire...

          darn...hn80 beat me to the finish line lol
          snowbird
          .... heck no... dive right in...

          we have to know consumption @ pressure

          and understand exactly how many cubic feet of air we have in the tank at the pressure that the plasma cutter needs..

          AND... Sledsports.... do you have a regulator that will make the pressure your plasma cutter wants..??
          .

          *******************************************
          The more you know, The better you know, How little you know

          “The bitterness of poor quality remains long after the sweetness of low price is forgotten”

          Buy the best tools you can afford.. Learn to use them to the best of your ability.. and take care of them...

          My Blue Stuff:
          Dynasty 350DX Tigrunner
          Dynasty 200DX
          Millermatic 350P w/25ft Alumapro & 30A
          Millermatic 200

          TONS of Non-Blue Equip, plus CNC Mill, Lathes & a Plasmacam w/ PowerMax-1000

          Comment


          • #6
            Originally posted by H80N View Post
            335 cf @ what PSI..??

            your plasma consumes how many CFM @ 60?? PSI..?? (60 is a guess... give us your real number)

            then we will have to find the calc to figure the conversion..

            how much cutting do you need to do??

            What is the matter with your compressor??
            Its a 3phase running off of a rotary phase converter or (add a phase) as some like to say. It burnt a leg up on my motor starter so a a new starter and some wiring, motor repairs and the compressor needs the head rebuilt with new unloaders (been putting that off for awhile). Fix it all at once is gonna be cash!
            Syncrowave 350lx
            XMT 350 CC/CV
            S74DX Feeder
            30a spoolgun
            Hypertherm 1000 g3
            Harris O/A
            Cincinnati lathe
            Acer Ultima "Bridgeport Mill"
            340hp Quincy and 400 gallon of air
            Other doodads and a stoker coal stove

            Comment


            • #7
              Originally posted by H80N View Post
              snowbird
              .... heck no... dive right in...

              we have to know consumption @ pressure

              and understand exactly how many cubic feet of air we have in the tank at the pressure that the plasma cutter needs..

              AND... Sledsports.... do you have a regulator that will make the pressure your plasma cutter wants..??
              Yea, I think I have a good oxy 2 stage Harris out there. I'm not sure if the correct stem is on it tho. I don't know what valve is on the Air cylinder. Haven't picked it up yet.
              Syncrowave 350lx
              XMT 350 CC/CV
              S74DX Feeder
              30a spoolgun
              Hypertherm 1000 g3
              Harris O/A
              Cincinnati lathe
              Acer Ultima "Bridgeport Mill"
              340hp Quincy and 400 gallon of air
              Other doodads and a stoker coal stove

              Comment


              • #8
                it may be cheaper to rent or buy a small compressor and work with it, slower but it 'll get the job done.

                Comment


                • #9
                  The compressor itself has had unloader problems for a while now. I got one unhooked. Its a 2 stage 340 on a 200 gallon tank. I had an electrical issue on the starts the other day and it burnt one of the legs up on the out starter. Cooked the terminal and burnt the wire off. Probably ruined the whole thing. It still pulls together but I'll bet the contacts on that leg is fried crispier than saterday morning bacon.
                  Syncrowave 350lx
                  XMT 350 CC/CV
                  S74DX Feeder
                  30a spoolgun
                  Hypertherm 1000 g3
                  Harris O/A
                  Cincinnati lathe
                  Acer Ultima "Bridgeport Mill"
                  340hp Quincy and 400 gallon of air
                  Other doodads and a stoker coal stove

                  Comment


                  • #10
                    if it is a "J" sized bottle... we are looking at bottle pressure of 2640 PSI = 310 CuFt...Standard Volume (14.7 psia, 70 F)

                    now we need the conversion formula to convert to volume @ 90psi
                    then divide by 6.7 cfm


                    Reference chart

                    http://www.ohiomedical.com/UserFiles...der%20Data.pdf

                    Last edited by H80N; 02-25-2014, 08:44 PM.
                    .

                    *******************************************
                    The more you know, The better you know, How little you know

                    “The bitterness of poor quality remains long after the sweetness of low price is forgotten”

                    Buy the best tools you can afford.. Learn to use them to the best of your ability.. and take care of them...

                    My Blue Stuff:
                    Dynasty 350DX Tigrunner
                    Dynasty 200DX
                    Millermatic 350P w/25ft Alumapro & 30A
                    Millermatic 200

                    TONS of Non-Blue Equip, plus CNC Mill, Lathes & a Plasmacam w/ PowerMax-1000

                    Comment


                    • #11
                      your contactor and wire frying has probably been caused by that defective unloader valve, as it tried to start loaded. Some time also combined with a defective check-valve at the tank entrance ( also seen parts of the head valve plates stuck in check valve...) Don't tell us it has no fuses or breaker Ha!

                      Comment


                      • #12
                        HN 80 if you get your hand on a formula to calculate cfm at different psi and psi at different cfm or whatever...I'm interested

                        Comment


                        • #13
                          Originally posted by snowbird View Post
                          HN 80 if you get your hand on a formula to calculate cfm at different psi and psi at different cfm or whatever...I'm interested
                          OK... here ya go...

                          http://www.engineeringtoolbox.com/co...ume-d_843.html

                          http://www.engineeringtoolbox.com/fr...ir-d_1190.html
                          Last edited by H80N; 02-25-2014, 09:04 PM.
                          .

                          *******************************************
                          The more you know, The better you know, How little you know

                          “The bitterness of poor quality remains long after the sweetness of low price is forgotten”

                          Buy the best tools you can afford.. Learn to use them to the best of your ability.. and take care of them...

                          My Blue Stuff:
                          Dynasty 350DX Tigrunner
                          Dynasty 200DX
                          Millermatic 350P w/25ft Alumapro & 30A
                          Millermatic 200

                          TONS of Non-Blue Equip, plus CNC Mill, Lathes & a Plasmacam w/ PowerMax-1000

                          Comment


                          • #14
                            Originally posted by snowbird View Post
                            your contactor and wire frying has probably been caused by that defective unloader valve, as it tried to start loaded. Some time also combined with a defective check-valve at the tank entrance ( also seen parts of the head valve plates stuck in check valve...) Don't tell us it has no fuses or breaker Ha!
                            Well you hit the nail on the head. Lol. Yes its breakered but its over killed like everything else I do.
                            Syncrowave 350lx
                            XMT 350 CC/CV
                            S74DX Feeder
                            30a spoolgun
                            Hypertherm 1000 g3
                            Harris O/A
                            Cincinnati lathe
                            Acer Ultima "Bridgeport Mill"
                            340hp Quincy and 400 gallon of air
                            Other doodads and a stoker coal stove

                            Comment


                            • #15
                              I can see that you guys have your act together but I don't. I shoulda gathered up more information than I have before I start gouging out questions. Lol. I'll pick up a cylinder and some fittings and see if I can round up more info and get back with you guys.
                              Syncrowave 350lx
                              XMT 350 CC/CV
                              S74DX Feeder
                              30a spoolgun
                              Hypertherm 1000 g3
                              Harris O/A
                              Cincinnati lathe
                              Acer Ultima "Bridgeport Mill"
                              340hp Quincy and 400 gallon of air
                              Other doodads and a stoker coal stove

                              Comment

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