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  1. 10th June 2017, 06:58 PM #1
    xpro
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    Default WIP - Tricky Money Box

    This toy will be a present for my 9 year old grand daughter, who told me last week that she likes counting money. This is not an original idea, just a modified and expanded version of one I saw on the net some time ago.
    A coin is placed on a designated spot,on a rectangular box. Turning the handle, a hand appears, covers the coin, and snaos back in the box. To see how much you have, a drawer is opened, but, no coin in it ! Where did the money go ?
    I started this by carving the hand. As to how the mechanicals will be done, no concrete idea yet. I have already promised this, so it must be kept !

    IMG_0878.jpgIMG_0879.jpgIMG_0877.jpg

    Thanks for looking,
    Gus
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  3. 11th June 2017, 09:49 AM #2
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    htl
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    Default Will be scary!!!

    That's one big hand so will be way cool when done.
    I've seen these in a small scale BUT!!!
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  4. 11th June 2017, 10:22 AM #3
    Keith_1
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    Love it Gus

    Regards

    Keith
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  5. 11th June 2017, 10:47 AM #4
    Ubernoob
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    That is cool, how big is the hand? It may be quite the money box by the end!
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  6. 11th June 2017, 11:08 AM #5
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    crowie
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    Now you have me intrigued Gus....Pulled up a chair! Cheers, Peter
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  7. 11th June 2017, 02:28 PM #6
    old1955
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    Default

    +1 what Peter said.

    Ross
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  8. 11th June 2017, 05:30 PM #7
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    Handyjack
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    You now have an extra hand for your build. The only place I have seen better looking spare hands is in prosthetic's.
    Looking forward to the rest of the build.
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  9. 12th June 2017, 08:43 AM #8
    xpro
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    Quote Originally Posted by Ubernoob View Post
    That is cool, how big is the hand? It may be quite the money box by the end!
    It's big mate, eyes not sharp enough to carve small ones ! Across the palm 55mm wrist to first finger joint 80mm.
    Cheers
    Gus
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  10. 12th June 2017, 09:56 AM #9
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    crowie
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    Have a look at this Gus,

    A friend on LumberJock's has motorized a automated wooden machine...

    Clayton Boyer Walking Bot/Dragon - by dansnow @ LumberJocks.com ~ woodworking community
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  11. 12th June 2017, 11:44 PM #10
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    Dalboy
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    That is one nice piece of carving and to get it that smooth wow. Looking forward to the rest of the build and how you construct the mechanism.

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  12. 13th June 2017, 09:54 AM #11
    xpro
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    Thanks Peter,
    Interesting work. It was heading for a fall off the bench towards the end !
    Gus
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  13. 13th June 2017, 10:17 AM #12
    xpro
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    Default WIP - Mechanism Prototype

    Using two gears, one with a number of teeth removed the mechanism does what I wanted. There is drawback though. Once the hand is retracted, the output gear doesn't finish at the exact same position each time, ie, isn't synchronised. What can be done about that, not sure yet, maybe a cam operating the hand is the answer, not gears.

    The basic mechanism
    Platform & Arms.jpgTop view.jpg
    A cable attaches to the brass pivot, through the pulley below and winds around the output gear shaft. This pulls the hand out of the box. When the input gear reaches the section without teeth, a rubber strip pulls it down.

    This video is of the top view,
    Hand a.mp4

    And from the side,

    Hand b.mp4

    Modification to the mechanicals methinks....
    Thanks for looking,

    Gus
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  14. 13th June 2017, 10:33 AM #13
    Bohdan
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    Hand needs to stay down against the top when it retracts and not lift or it will leave the coin behind.

    Great work, keep it up
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  15. 13th June 2017, 05:00 PM #14
    Keith_1
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    Top work Gus

    Regards

    Keith
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  16. 13th June 2017, 05:58 PM #15
    xpro
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    Default WIP - Modified Mechanism

    The short video is how the mechanism works using a cam, which works much better than yesterday's gears.

    Modified mechanism.mp4

    Next, the drawer.

    Thanks for looking,
    Gus
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