Announcement

Collapse
No announcement yet.

A luddite approach to mechanized cutting

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • A luddite approach to mechanized cutting

    This has drawn out way longer than I'd hoped, but it seems to be getting closer...

    I wanted an inexpensive low tech plasma cutting guide. I've seen the Torchmate and read the HSM article by Mr Verity. Seems simple enough...

    I bought a PWM kit from a kit supplier. I had a cordless drill that the battery had crapped out on. and some miscellaneous bits and pieces.

    Pic 1 is a pic of the circuit as it was tested. Ive added a fuse and an enclosure.

    Picture 2 is the linkage. I'd bought some cheap, nasty unsealed ball bearings from the local discount house. They worked really well on the arm joints.

    Picture 3 is a close up of the tracer spindle

    Picture 4 is a close up of the torch holder.
    Design to 0.0001", measure to 1/32", cut with an axe, grind to fit

  • #2
    Picture 5 is a sample cut.

    Just another view that shows the overall arrangement.

    Some initial comments..

    I need to slow the tracer speed down. The torch speed at the present minimum setting is too fast even for the 10 gage test piece. If I can't reduce the lowest speed on the controller, I have a power window worm gear motor that should do fine.

    The welding magnet I used to energize the tracer is a little weak. I've heard that the magnets in magnetic grounds are stronger. That would help.
    Design to 0.0001", measure to 1/32", cut with an axe, grind to fit

    Comment


    • #3
      Very cool! Let's call it "Minimalist", that sounds nicer than Luddite.
      Nice work, I like the use-what-you-have-on-hand look of it. Are you doing this just as an interesting project, or do you have a bunch of something you need to cut out?

      Thanks for posting this. I, for one, love seeing these sort of project posts. Talented bunch around here.

      Comment


      • #4
        Originally posted by alanganes
        Are you doing this just as an interesting project, or do you have a bunch of something you need to cut out?

        Thanks for posting this. I, for one, love seeing these sort of project posts. Talented bunch around here.
        I don't have a large number of any one thing, but I do have some projects in progress that will really benefit from mechanized cutting.

        I dunno 'bout talent. This is a direct offshoot from Verity's HSM article a few years ago. FWIW, it would be simple to adapt to oxyacet use too. In fact, Tom V's machine used an oxy-acet torch, but no magnet on the tracer stylus.

        I'm a bit disappointed with the welds. I came by a wirefeed welder and am still getting used to it It is a 110v fluxcore only machine. It will weld the tissue paper sq tbg, but will still burn through if care is not exercised.

        BTW, you're welcome.
        Design to 0.0001", measure to 1/32", cut with an axe, grind to fit

        Comment


        • #5
          Have you by any chance a not to distant relative by the name of
          Rube Goldberg. ? :-)
          ...lew...

          Comment


          • #6
            Originally posted by camdigger
            I don't have a large number of any one thing, but I do have some projects in progress that will really benefit from mechanized cutting.

            I dunno 'bout talent. This is a direct offshoot from Verity's HSM article a few years ago. FWIW, it would be simple to adapt to oxyacet use too. In fact, Tom V's machine used an oxy-acet torch, but no magnet on the tracer stylus.

            I'm a bit disappointed with the welds. I came by a wirefeed welder and am still getting used to it It is a 110v fluxcore only machine. It will weld the tissue paper sq tbg, but will still burn through if care is not exercised.

            BTW, you're welcome.

            How did Tom V's machine follow the template without a magnet on the tracer stylus?

            AJ

            Comment


            • #7
              Took me a little while to figure out what it all does.. But after I did, I gotta say, thats awsome.

              The magnet setup as is kinda sets up a nice closed loop for the magnet flux. Maybe if you let the bottom magnet get a little closer to the plate, it would incress the strength. Only problem I see is that bottom magnet may attract the tracer to other metal objects.

              Maybe spot welding some more nuts onto the bottom of the tracer plate to close the gap and 'tailor' some of the magnetic hold?
              Play Brutal Nature, Black Moons free to play highly realistic voxel sandbox game.

              Comment


              • #8
                Allright! Enough is enough!

                I'm callin' you out, Mister!

                I didn't see more than one or two zip ties, a piece or two of baling wire, and I didn't spot as much as a yard of duct tape...

                You call yourself a Luddite? Turn in your authorized Red Green copywrited
                suspenders, you fraud!

                You are dangerously close to the twin heresies of Fabricator and Prototyper!

                (Nice work! And Merry Christmas!)

                Comment


                • #9
                  I built one years ago using a 12 volt w/shield wiper motor and a model train transformer for the speed controler.
                  I'd get a pic but it would take me a week to unearth it out of a shed!!!

                  THANX RICH

                  People say I'm getting crankier as I get older. That's not it. I just find I enjoy annoying people a lot more now. Especially younger people!!!
                  People say I'm getting crankier as I get older. That's not it. I just find I enjoy annoying people a lot more now. Especially younger people!!!

                  Comment


                  • #10
                    Love the torch trigger switch control operator interface in Pic 4

                    john
                    John

                    I used to be indecisive. Now I'm not so sure , but I'm not a complete idiot - some bits are still missing

                    Comment


                    • #11
                      Nice,

                      I had a 3' square burning O/A table that came from a university, was going to put the Plasma on it but never did and sold it on as taking up too much space

                      I'm often tempted to bolt a 4' length of box section to the CNC mill table and use the X Y travels to carry the plasma torch over a temporary sub table at the side.

                      Problem is laser cutting round here is just too accessible to bother about setting up, may be worth doing if I do buy one on those inverter plasma's I'm wondering about as the big Cebora is too much trouble to setup.
                      .

                      Sir John , Earl of Bligeport & Sudspumpwater. MBE [ Motor Bike Engineer ] Nottingham England.



                      Comment


                      • #12
                        question about the tracer

                        What is the point of having the tracer in the first place? I helped a friend build a plasma pantograph. We just clamped the part to the top table and by hand held the stylus and made it follow the template. We wired in a foot pedal to switch on the plasma cutter. With a little practice for consistency moving the stylus it was fast, accurate and simple. I like simple.
                        Location: The Black Forest in Germany

                        How to become a millionaire: Start out with 10 million and take up machining as a hobby!

                        Comment


                        • #13
                          When you are doing a lot of parts the motorised tracer takes the effort out of it to get clean consistent cuts.

                          Put an over arm above the pattern with a pin that can be placed rougly in the centre of the pattern, just above it.
                          From this pin a big rubber band [ inner tube ] goes to a bearing on the top of the follower drive.

                          This will pull the follower onto the pattern and enabled you to use easily cut plywood templates.
                          .

                          Sir John , Earl of Bligeport & Sudspumpwater. MBE [ Motor Bike Engineer ] Nottingham England.



                          Comment


                          • #14
                            Thanks for all the comments guys!

                            Verity held the stylus against the pattern with his hand.

                            As far as the Red Green/Luddite accusation, I subsituted vinyl electrical tape for haywire and duct tape and an Oring for haywire. It's more discreet.
                            Originally posted by John Stevenson
                            When you are doing a lot of parts the motorised tracer takes the effort out of it to get clean consistent cuts.

                            Put an over arm above the pattern with a pin that can be placed rougly in the centre of the pattern, just above it.
                            From this pin a big rubber band [ inner tube ] goes to a bearing on the top of the follower drive.

                            This will pull the follower onto the pattern and enabled you to use easily cut plywood templates.
                            As it stands now, I could extend the threaded rod holding the pattern and loop a postie elastic around that and the stylus if I wanted to go that way. I still have reservations re how that would work if the pattern had a surface that was parallel to the elastic band, or had a concave feature like an alternator belt bracket.

                            Still, it's been a fun project. Sadly, it may be on the shelf for a while, work seems to be picking up. Hard to get much done in the shop from half way around the world.

                            They got Heathrow back on track yet?
                            Last edited by camdigger; 12-26-2010, 10:25 AM.
                            Design to 0.0001", measure to 1/32", cut with an axe, grind to fit

                            Comment

                            Working...
                            X