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John Stevenson's gear cutting writeup

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  • John Stevenson's gear cutting writeup

    Maybe 8 or 10 years ago I read a article that our late John Stevenson wrote on cutting gears. It helped me a lot, but now I can't find it. I need to cut a bunch of small gears and would like to read it again. Does any one here know where I might find it or get a copy of it?
    _____________________________________________

    I would rather have tools that I never use, than not have a tool I need.
    Oregon Coast

  • #2
    This may be the one you re looking for. This goes back to the rec.crafts.metalworking days, when Sir John was active on there. Interesting tidbit about this: at the time, I was repairing an somewhat beat up Jet 10x24 lathe I had bought. It had a chewed up gear in the QC box that I was trying to duplicate. As it turned out it was a 1.5 mod, 13 tooth gear. I was asking for advice there on how I might make one. John used it as an example in this write-up for my benefit, sent me an email and told me that everything I needed to know would be in this write up.

    Here is a archived copy:

    https://web.archive.org/web/20130112...ear/gear1.html

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    • #3
      alanganes, that is for sure part of what I remember. Thanks so much. I think there might be a other part of it, but this will surely help.
      Thanks
      _____________________________________________

      I would rather have tools that I never use, than not have a tool I need.
      Oregon Coast

      Comment


      • #4
        There was a good-looking write-up in one of the magazines recently also. I believe it may have gone across two issues. I did not go through it in detail, as I have a goodly number gear cutters (I am looking for more though, as I have some holes in the sets).
        1601

        Keep eye on ball.
        Hashim Khan

        Comment


        • #5
          Originally posted by alanganes View Post
          That was a great paper by John. Its nice to see its still up. I used to harvest the metalwebnews. And that one is in there.

          John and I had a similar affliction. Bildgeport with AH-HA cnc controller. He was a great help when I was fixing the drivers for my mill. The software help also. JR
          My old yahoo group. Bridgeport Mill Group

          https://groups.yahoo.com/neo/groups/...port_mill/info

          Comment


          • #6
            Here you go Mel

            I gave a seminar at the Detroit NAMES show on gear making and used the links below in my handout.

            GOOD CONSTRUCTION ARTICLES

            Mikes Workshop- Math and chart of Button Sizes
            http://mikesworkshop.weebly.com/desi...r-cutters.html

            John Stevenson’s Write-ups on building a gear cutter with chart and Button Sizes
            http://www.metalwebnews.com/howto/gear/gear1.html
            http://bbs.homeshopmachinist.net/thr...involute+shaft

            INFORMATION SITES

            Rich’s write-up and photos of forming relief on the gear cutter on the Chaski Website,
            in a thread called Shop Made Spur Gear Cutters posted Jan 28,2012
            http://www.chaski.org/homemachinist/...91985&start=24

            HSM website covering cutting/shaping gears called A Shop Made Gear Cutter 4/7/2008
            http://bbs.homeshopmachinist.net/thr...leadscrew+nuts
            http://www.gearotic.com/
            http://school.mech.uwa.edu.au/~dwrig...g/meshing.html

            Metric Gear Info
            http://www.micro-machine-shop.com/module_gear_data.pdf

            BOOKS TO OWN
            Ivan Laws- Gears and Gear cutting -1987- ISBN-10: 0852429118
            Van Keuren Precision Measuring Tools ( Gear measuring system-get any old book ! )

            Model Engineer Magazine
            Unwin – Making Milling Cutters - Oct 1971 ( the Supreme Granddaddy Article !)
            Lammas-Gear Cutting-July to November-1991

            Rich

            Comment


            • #7
              Thanks so much everyone, that helps a bunch.
              _____________________________________________

              I would rather have tools that I never use, than not have a tool I need.
              Oregon Coast

              Comment


              • #8
                This is what I am attempting to build. Lots of gears to cut. I have some done that I made a few years ago before my eyes took a dump. but now that I got the cataracts removed, My Macular Degeneration under control and some new glasses I am ready to try to finish it.

                _____________________________________________

                I would rather have tools that I never use, than not have a tool I need.
                Oregon Coast

                Comment


                • #9
                  That largest gear is 123 tooth, the smallest one is 6 teeth.
                  _____________________________________________

                  I would rather have tools that I never use, than not have a tool I need.
                  Oregon Coast

                  Comment


                  • #10
                    The gears are not going to provide any real accuracy in the motion of the planets. Their orbital motions are too irregular for that. You might as well use pulleys and belts.

                    But if you want nice and shiny gears for appearance sake, knock yourself out.



                    Originally posted by lugnut View Post
                    This is what I am attempting to build. Lots of gears to cut. I have some done that I made a few years ago before my eyes took a dump. but now that I got the cataracts removed, My Macular Degeneration under control and some new glasses I am ready to try to finish it.

                    Paul A.
                    SE Texas

                    Make it fit.
                    You can't win and there is a penalty for trying!

                    Comment


                    • #11
                      Party pooper! It's not like he's going launch a rocket to get there.

                      I think it's pretty cool!

                      Comment


                      • #12
                        Well Paul, I spent $120 for a set of 32DP gear cutters and it's going to use gears I think by the time I get done, I should know a little more about cutting gears.
                        _____________________________________________

                        I would rather have tools that I never use, than not have a tool I need.
                        Oregon Coast

                        Comment


                        • #13
                          Tedious work but the gears are easy with the right equipment. I'm wondering where you'll get all the telescoping hollow shafts. I guess you can get them in brass though. I need some in steel to make two small spring over center locks.

                          Comment


                          • #14
                            Originally posted by CCWKen View Post
                            Tedious work but the gears are easy with the right equipment. I'm wondering where you'll get all the telescoping hollow shafts. I guess you can get them in brass though. I need some in steel to make two small spring over center locks.
                            Cannibalize one of them old timey telescoping radio antennas.
                            Location: Long Island, N.Y.

                            Comment


                            • #15
                              I do not know why the accuracy should be bad for gears, as long as the ratios can be set up correctly with the tooth ratios.

                              That may be the problem which Paul is trying to suggest, the ratios may need some "interesting" gear combinations. But as for "irregular", I don't see that as an issue, they are far enough apart that any gravitational irregularities are far less than the error of simply visually seeing the position with the large "representative" planet spheres. Aside from gravitational stuff, the orbits should be fairly ideal at the level of detail such a model can give.

                              As long as the ratios between the different planets is set up right, it should be fine. Even if it has nice shiny gears.......

                              As for shafts, hobby shops can provide telescoping brass tubing in a range from about 1/8" to 1/2".
                              1601

                              Keep eye on ball.
                              Hashim Khan

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