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Non-Circular Gears

Discussion in 'Gear/Lever Systems' started by kram242, Feb 20, 2009.

  1. kram242

    kram242 Administrator Staff Member

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    A cool little experiment in gearing
    I saw a show where a guy was riding a bike with square wheels on a wavy runway and he was rolling along nice and smooth. That's when I started to get into non-circular gears like you see here. They just amaze me :D
    I later found a dxf of these gears and went to town in SketchUp.
    Pretty cool conversation piece.
    Have fun
    Mark

    Note *Because the teeth are small I use a 1/16" bit for this cutout.






    Attached files [​IMG] Non_Circular Gears.dxf (464.8 KB)Â Non_Circular Gears.zip (378.7 KB)Â [​IMG]
     
  2. 66tbird

    66tbird Moderator Staff Member

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    I seen custom clocks with odd gear shapes also. Some good vids out there also. It is a trick on the brain that's for sure. But if you thing about it it's mealy interlocking a distance relationship through a mechanical means. Works in 3D too.

    Good find, thanks for the code.
     
  3. gben

    gben Member

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    Mark,

    Just ran across this video on non-circular gears and thought you might enjoy it.
     
  4. kram242

    kram242 Administrator Staff Member

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    Ben that is just AWESOME! I have to find out how he made these there must be software for this.
    Thank you for sharing this
    Mark and Trish
     
  5. sharbold

    sharbold New Member

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  6. kram242

    kram242 Administrator Staff Member

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    I have tried this one but did not have a lot of time to work with it. I plan to go back and check it out more as soon as I can
    Thanks Sam
    Mark and Trish
     
  7. Tweakie

    Tweakie Member

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    Hi All,

    I have just received my license for the Gearotic Motion software which, if you are into gears, is just a brilliant piece of kit.

    Thought you may be interested in seeing some cut in acrylic.

    Tweakie Attached files [​IMG]
     
  8. kram242

    kram242 Administrator Staff Member

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    That is truly a work of art! (to me) :D
    Thanks for sharing this Tweakie.
    I have had very little time to play with this one like I would like to but as things settle here I plan on getting into it straight away, it does some really amazing things.
    Here are some examples of somethings I would like to make :)
    Thanks again
    Mark and Trish
     
  9. Tweakie

    Tweakie Member

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    Unfortunately the current version of Gearotic does not support non circular ring gears but who knows this feature may become available in the future.
    Of course Gearotic Motion has a much more serious side – making the GCode for spur gears / helical gears which can be conventionally cut on a rotary axis but using a parallel end mill. This arrangement circumvents the patent which was taken out a couple of years ago for this method but using an involute ground endmill. Some of the examples of gears shown on the forum are just awesome and it is well worth the visit.

    Tweakie. Attached files [​IMG]
     
  10. kram242

    kram242 Administrator Staff Member

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    Those came out fantastic! Do you have any idea about how long it took to cave these out? and is that 1/8 or 1/4 thick?
    Thanks Tweakie
    Mark and Trish
     
  11. Tweakie

    Tweakie Member

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    They are 6mm acrylic and were laser cut taking about 15 minutes for the pair, the largest is about 100mm across. (Those in the first picture were 3mm).

    Tweakie.
     
  12. kram242

    kram242 Administrator Staff Member

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    Thanks Tweakie! They are truly awesome. I am guessing you are planing to mount them and try them out? :)
    Mark and Trish
     
  13. Tweakie

    Tweakie Member

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    A few more cut from acrylic and mounted.

    Tweakie. Attached files [​IMG]
     
  14. kram242

    kram242 Administrator Staff Member

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    Nice! Is the rotation nice and smooth?
    I bet they are cool to see in action
    Thanks for posting
    Mark and Trish
     
  15. Tweakie

    Tweakie Member

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    They do run nicely but the motion is not linear as can be seen in this simulation http://www.youtube.com/watch?v=_I_sMO_cTrc
    They are strange but fascinating to watch and I am sure that these gears have an application for self build wall clocks which could have stunning visuals such as the kinetic sculpture in another thread.

    Tweakie.
     
  16. MartinT

    MartinT Member

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    OOOOOHHHH! :eek:
    Mankind is capable of making incredible things!!!
     
  17. Tomfille

    Tomfille New Member

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    wow, i'm amazed! i thought it to be completely unbelievable! I won't believe still unless i see it with my own eyes!
     
  18. kram242

    kram242 Administrator Staff Member

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    Works like this
     
  19. Evil-Tunes

    Evil-Tunes Moderator Staff Member

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  20. kram242

    kram242 Administrator Staff Member

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    Cool Glen! :good:
     
  21. 3DMON

    3DMON Moderator Staff Member

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    That is clever.
     
  22. Tweakie

    Tweakie Member

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    Obviously requires the camera shutter to make it visible so you cant just fit one to your bike and amaze onlookers but an excellent illusion, thanks for posting E-T, something else I have learned.

    Tweakie.
     
  23. thunder hawk

    thunder hawk Member

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    Now that's slicker than snot on a door knob. :lol: :lol: :lol:

    Very cool :doubleup: :doubleup: :doubleup: :doubleup: :doubleup:

    GHB :D
     
  24. PAULE

    PAULE Member

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  25. cemal

    cemal New Member

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    fabulous stuff.
    makes me want to cut gears. :)

    nice.

    loving the funkie shape, but how ?
     

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