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  1. #1
    Or as i call them by their technical name thingamabobs. These were made on my Harrison M250 lathe converted to CNC.

    Control software Mach3, Cad/Cam OneCNC



    Phil

  2. #2
    what are they for?
    it does look like you can have hours of fun with them :rofl:
    there is no such thing as a stupid question, just stupid answers !!!!

  3. #3
    Nice, they look like fun!
    .Me

  4. #4
    Nice...I once made cylindrical version of that.

    How did you hold it in the chuck? Soft jaws machined to fit?

    Very effective, though kind of cheating rolling them with one soft surface.

  5. #5
    Quote Originally Posted by h4ppy-chris View Post
    what are they for?
    it does look like you can have hours of fun with them :rofl:
    Well i don't know about hours, few minutes maybe. They have been made for someone to use in demonstrations and have some fun.

    Quote Originally Posted by Jonathan View Post
    Nice...I once made cylindrical version of that.

    How did you hold it in the chuck? Soft jaws machined to fit?

    Very effective, though kind of cheating rolling them with one soft surface.
    They are cylindrical, no i didn't use soft jaws and i am rolling them using shiny clear perspex which is nice and hard.

    Phil

  6. #6
    Quote Originally Posted by M250cnc View Post
    They are cylindrical, no i didn't use soft jaws
    Hmm, so did you machine them all in one operation? Or are you not disclosing how :naughty: I saw the other thread about it here a while ago.

    By cylindrical I mean mine were just prisms. I did it in the lathe by offsetting the center and machining it three times.

    Quote Originally Posted by M250cnc View Post
    i am rolling them using shiny clear perspex which is nice and hard.
    Exactly - now use two pieces of perspex. That would be even more impressive.

  7. #7
    Quote Originally Posted by Jonathan View Post
    Hmm, so did you machine them all in one operation? Or are you not disclosing how :naughty: I saw the other thread about it here a while ago.
    My approach would be to turn the pointy bit and then basically part off the lightly curved face first roughing a relief down to maybe 10mm dia and then finishing the face and parting off the final 10mm in one go - if you get the tool shape right it should work ok.

    Anywhere near? :-)

  8. #8
    Quote Originally Posted by Jonathan View Post
    Hmm, so did you machine them all in one operation? Or are you not disclosing how :naughty: I saw the other thread about it here a while ago.

    By cylindrical I mean mine were just prisms. I did it in the lathe by offsetting the center and machining it three times.


    Exactly - now use two pieces of perspex. That would be even more impressive.
    Jonathan i have never heard anyone call a prism cylindrical before. :lol:

    I would have tried rolling them on two pieces of perspex but as i made them for a customer i can't really get them all scratched can i.

    They are on a thick towel as i was using a glass table and didn't want to explain to her indoors about any accidents. :whistling:

    Phil

  9. #9
    The shapes are for me. They look awesome! Looking forward to the postman knocking.

    Here's a little blog post I wrote about shapes and solids of constant width :

    http://blog.stevemould.com/50p-coins-make-great-wheels/

    Sent from my Nexus S using Tapatalk

  10. #10
    z3t4's Avatar
    Lives in Manchester, United Kingdom. Last Activity: 27-01-2024 Has been a member for 9-10 years. Has a total post count of 31.
    Thanks Phil & Steve. The video is brilliant!
    More here on these curves.
    HTH
    John

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