Improbability Drive

Discussion in 'Finished Projects' started by Ken I, Nov 13, 2011.

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  1. Nov 14, 2011 #21

    Jeremy_BP

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    Oh... Well... Um...
    My mind is absolutely blown. That is awesome. Would you consider making plans?
     
  2. Nov 14, 2011 #22

    steamer

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    Hey Ken,

    I've used them before in automation applications...so I had an unfair advantage....

    Dave
     
  3. Nov 14, 2011 #23

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    Simon

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    Some of the top-end telescope mounts use harmonic drives instead of the old worm and wheel.
    Not heard of cycloidal drive... interesting!
     
  4. Nov 14, 2011 #24

    Captain Jerry

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    Ken

    Your device has been kicking around in the back of my mind, trying to find a slot to fit in. Sort of a radial engine (inside out) and sort of a swash plate (plate angle parallel to shaft) but totally unique. I think you have created a new class of engine. I would call it a "Squash Plate."

    Jerry
     
  5. Nov 14, 2011 #25

    Ken I

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    Jerry, "Squash Plate" :big:

    Jeremy_BP - it never crossed my mind that anyone else might want to try it.

    I do have drawings - give me a couple of days to tidy it up to "as built" and add a few build notes to it and I'll post it under the downloads section.

    Obviously you would have to redesign around whatever bearing you can get your hands on - these things are fearsomely expensive so you would need to find a discard.

    This one came out of the "L" or "U" axis drive on a Yaskawa Motoman L10 W 6 robot - which is now hopelessly obsolete - if you can find a local Motoman repair shop they might give you one off an old unit being cannibalised for spares.

    The actual part number is
    HD (Harmonic Drive Systems) 25-80-474 3
    No idea what the designation means - the bore is 28mm and the OD is 60.6 x 62.1 (Eliptical)

    Ken
     
  6. Nov 14, 2011 #26

    student_Machinist

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    :bow: that is unbelievably awesome!
     
  7. Nov 14, 2011 #27

    kustomkb

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    That's really cool Ken!

    It really gets the "wheels" turning, or should I say "harmonic"
     
  8. Nov 15, 2011 #28

    Jeremy_BP

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    I would absolutely love to build one, although a harmonic drive would be rather difficult to source for me. I'll have to start asking around.
     
  9. Nov 15, 2011 #29

    Ken I

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    Jeremy_BP - O.K. I've posted the plans under the download section.

    I draw anything I make - I'd rather find the obvious flaw on the drawing board than in the middle of manufacturing.

    The file contains 2D ACAD *.dwg & *.dxf as well as a *.doc file of build notes.

    Ken
     
  10. Nov 15, 2011 #30

    ChrisB

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    A truly fascinating engine, and an even more fascinating mind to come up with it and build one.

    Downloading the plans now, if for nothing else to have a good nose through to work it out. Thanks for taking the time to share this really interesting build with us all. I know that I for one will get a lot out of it.

    Cheers


    Chris
     
  11. Nov 15, 2011 #31

    Jeremy_BP

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    Ken - Thanks. Time to start scrounging. :p
     
  12. Nov 15, 2011 #32

    Rocket Man

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    That is a very interesting engine.

    For many years I have wanted to build the 12 cylinder apposed cylinder engine but I don't have the equipment to make the cam crank shaft. Your engine has given me some ideas to play round with.
     
  13. Nov 15, 2011 #33

    bearcar1

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    Truly an interesting and unique drive assembly Ken. Fascinating to watch with all of its parts and as has been presented, quite the mystery to figure out how exactly it works. A big thank you for sharing your drawings with us and a well deserved KP for all of your efforts.

    BC1
    Jim
     
  14. Nov 15, 2011 #34

    dieselpilot

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    I think anyone that's seen a harmonic drive mechanism would remember it. It wasn't obvious in the photos, but I had a hunch that's what was going on. The video proved it, but Steamer had identified it by the I had woken up that day. It's a great idea!
     
  15. Dec 16, 2011 #35

    AussieJimG

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    Thank you sharing your ingenious engine and for introducing me to the harmonic drive and the cycloidal drive. Now you have got me thinking: does it need a harmonic drive?

    Could it be done with the roller bearings on the end of the levers operating on a cam shaped something like the wave generator?

    Jim
     
  16. Dec 17, 2011 #36

    Ken I

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    Jim, you've got a point - if you built an eliptical (4 radius) hub with roller bearings constrained by a cage (which does not have to flex as long as its inner and outer rads don't foul) then each of the levers could contain an arc segment to bear against the rollers.

    All horrible and complicated to no usefull purpose other than to have fun.

    Ken
     

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