Bits and Pieces

Wed, 19 Oct 2011

All sorts of bits and pieces today, some more successful than others. Starting with…

For the pyramid model, I'm working on a mechanism that will turn the top of the pyramid through ninety degrees. I put this together based on the internals of a retractable pen. Two problems, the pens I looked at were divided into six rather than four, that and the fact that the pen is driven by a spring makes the action far more positive in the pen than in the paper model. Back to the drawing-board. 


My next thought was to drive the top round with a couple of quarter circle gears. I'm now wondering if the parts of this would be better based on the bevel gear model. Its all looking a bit over engineered so I've put it to one side while I think about it.


While I'm thinking about the pyramid model I thought I'd make a chain model to add to my collection of paper mechanisms. Starting with a pinion…


I made a box to hold a couple of pinions then added a 'chain' made from a folded strip of card with holes matching the teeth on the pinions. 


The result works well. I might try this with different size wheels to see if it works.


…and to finish off. A pair of fat pants, ready to fit with some hairy legs.

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Comments (1)

  • ijustgolf October 21, 2011 at 6:44 pm

    ah yes…   a hoisting,

    ah yes…   a hoisting, partial radial motion…    maybe a geneva drive in combination with some sort of cam assembly..     the cam-driven hoist lever assembly used in my animation has two wheels lined up beneath the spars so that when it is hoisted, it can rotate on these hoist wheels..    adding a geneva drive would then restrict the rotation..

     

    then again, the mech used in the pen was interesting as well..

    Gum..

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