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  • Well thank you sir! That might just be enough engouragement to post my rotary table shortly.

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    • Originally posted by BCRider View Post
      Using bearings like this in a way aids in ensuring that the broach doesn't try to rotate during use and produce a wandering hole.
      The broach has to rotate during use in order to work.
      Kansas City area

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      • Originally posted by Toolguy View Post
        The broach has to rotate during use in order to work.
        I'd say "Oscillate" would be a better word. If it rotated it would form a round hole which is sort of pointless.
        Chilliwack BC, Canada

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        • It rotates with the workpiece at the same speed, on a different axis.
          Kansas City area

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          • Nutate would be a good description. That's like a spinning top will have it's axis slowly rotating about the contact point at the bottom.
            .
            "People will occasionally stumble over the truth, but most of the time they will pick themselves up and carry on" : Winston Churchill

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            • Originally posted by Toolguy View Post
              It rotates with the workpiece at the same speed, on a different axis.
              If used in a lathe with the arbor in the tail stock that would sure be the case. I was thinking milling machine or sturdy drill press. I think we're on the same page but were thinking different machines.

              "Nutate", had to look that up. It's sure the right word and a new one on me. I've always just called it "wobbling"...
              Chilliwack BC, Canada

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              • i think Boat69 should introduce himself and tell us about himself in a different thread.
                I will be the first to welcome another S African to the forum. I was feeling lonely here.

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                • Originally posted by BCRider View Post
                  If used in a lathe with the arbor in the tail stock that would sure be the case. I was thinking milling machine or sturdy drill press. I think we're on the same page but were thinking different machines.

                  "Nutate", had to look that up. It's sure the right word and a new one on me. I've always just called it "wobbling"...
                  :-) There is an interesting word. I first learned it in 1950 . The RADAR set I was working on used that motion to drive the feed horn to do a circular scan.
                  Haven't had much use for the word since. :-)
                  ...lew...

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                  • Originally posted by lew hartswick View Post
                    :-) there is an interesting word. I first learned it in 1950 . The radar set i was working on used that motion to drive the feed horn to do a circular scan.
                    Haven't had much use for the word since. :-)
                    ...lew...
                    fps 6 ?
                    “I know lots of people who are educated far beyond their intelligence”

                    Lewis Grizzard

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                    • The tool designed and built by boats67 is excellent and it will no doubt stand heavy use for many years. However, for hobby use or for a one off job it is possible to use a much simpler tool, see:
                      http://mikesworkshop.weebly.com/rotary-broaching.html
                      http://mikesworkshop.weebly.com/rota...-the-mill.html
                      Mike

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                      • Originally posted by Dave C View Post
                        fps 6 ?
                        No. I think it was something like SP1 something, I believe it was a Navy set. It was in the PA Air National Guard and was probably OLD at that time. Gosh
                        I'm lucky to even remember that much. I do remember it had a dark trace projection display along with the A scope. My later work was CPS-5 and
                        CPS 6B in the Air force. The guard even had an SCR 525 (not sure of the number there). A pair of antennas that looked like bed springs. :-)
                        ...lew...

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                        • Originally posted by TGTool View Post
                          Nutate would be a good description. That's like a spinning top will have it's axis slowly rotating about the contact point at the bottom.
                          I think you're confusing precession with nutation. The motion you describe is precession; the "nodding" motion of the spin axis while precessing is nutation.
                          Regards, Marv

                          Home Shop Freeware - Tools for People Who Build Things
                          http://www.myvirtualnetwork.com/mklotz

                          Location: LA, CA, USA

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                          • made a set of adapters to press the bearings out of Shimano outboard bottom brackets and press in off the shelf cartridge bearings. A) because I'm cheap and b) because I can

                            making the doodad to press the bearings in - first trepanned a chunk of alu to make some custom spacers for the bottom bracket


                            then turned down the stub


                            then parted off from the chunk

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                            • pressing out the old bearings. Used a piece of black iron tube to hold the shell and some random steel as the pusher. One of the shells needed the ID opened up to get to the back of the old bearing


                              pressing the new bearing in


                              finished job


                              collection of parts (inc. new spacers and old plastic ones)


                              the bearings spin much more freely than the old ones, even when they were new, and I got 10 decent ones (Abec 5 supposedly) off Aliexpress for $16, so I can do the bearings on my other bike and still have 3 sets left over!

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                              • Been hard at work after reading every page of this thread, made a big long list of things to do. Pretty new to this stuff so it's been good learning.

                                Wooden cart for stock storage:


                                Speed vise to replace the absurdly dumb handle that came with my import vise:


                                Lathe micrometer carriage stop:

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