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  • Fun with math.. and linuxcnc.

    with spindle position and a little math... (you can make a polygon on a lathe..) I need to get a girlfriend...


  • #2
    External is easy. I would like to see internal
    Helder Ferreira
    Setubal, Portugal

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    • #3
      Was staring at that then the penny or 50p over here dropped, I was looking at a “rose engine” thingy, fascinating cam operated big boy Spirograph ( I loved those things as a ...... oh well still do)
      nice job
      mark

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      • #4
        Originally posted by Noitoen View Post
        External is easy. I would like to see internal
        I have zero doubts that Sam (skunkworks) could do internal just as well. I think calling any of it easy is a big stretch. The vast majority of cnc controls just can't handle this sort of coordinated movements, linuxcnc that Sam uses is very unique in its capabilities. It takes a guy like Sam to exploit those capabilities though !

        Don't hold your breath waiting to see this done with the Centroid Acorn control ! LOL

        Way to go Sam !
        Last edited by Sparky_NY; 09-17-2020, 05:30 AM.

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        • #5
          What's the big deal?

          The compound on my lathe jumps around like that to. I am not sure it is supposed to and it makes it kind of hard to turn "round things".

          It might have something to do with backlash(?).

          I don't know. I am a newbie at this stuff.

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          • #6
            Three things I hate. Math

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            • #7
              I particularly enjoyed the commentary. Some other video makers could learn from this example, with never a wasted word.

              George B.

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              • #8
                Now add live tooling to the lathe try an internal one

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                • #9
                  I have done internal on the mill.. Same difference..



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                  • #10
                    Tool geometry is very important..

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                    • #11
                      Harumph. Real machinists to this manually.
                      "A machinist's (WHAP!) best friend (WHAP! WHAP!) is his hammer. (WHAP!)" - Fred Tanner, foreman, Lunenburg Foundry and Engineering machine shop, circa 1979

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                      • #12
                        Originally posted by Sparky_NY View Post

                        I have zero doubts that Sam (skunkworks) could do internal just as well. I think calling any of it easy is a big stretch. The vast majority of cnc controls just can't handle this sort of coordinated movements, linuxcnc that Sam uses is very unique in its capabilities. It takes a guy like Sam to exploit those capabilities though !

                        Don't hold your breath waiting to see this done with the Centroid Acorn control ! LOL

                        Way to go Sam !
                        I'll have to try that with my Centroid M400 control. It seems like my control would do it. It would just be a matter of coordinating 4th axis rotation with tool position which I've done any number of times. Shouldn't take much math, I would lay it out in CAD. Maybe divide the rotation in degree increments with an associated tool position.

                        Here's a part of similar complexity, hand coded. Showing tool position needing coordination with rotation angle done on my Centroid control. In my case the tool was a 60 degree vee wheel cutter rotating in the mills vertical spindle with the work between centers in the 4th axis..

                        I assume the Acorn could also do this. If it won't I'll have to change my plans of retrofitting an old CNC with Acorn and Clearpath servos.

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                        Last edited by DR; 09-18-2020, 12:35 AM.

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                        • #13
                          Yea, but the OP showed a SQUARE. Those 90° corners will add some to the difficulty level.



                          Originally posted by skunkworks View Post
                          I have done internal on the mill.. Same difference..



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                          Paul A.
                          SE Texas

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

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                          • #14
                            The outside of a square shape is easy on a rose engine. The inside is quite a bit harder

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                            • #15
                              I am the op - that was the same process - just 6 sided. It can also do 4 sided.(n-sided)

                              Originally posted by Paul Alciatore View Post
                              Yea, but the OP showed a SQUARE. Those 90° corners will add some to the difficulty level.




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