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July 23, 2009
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crossbow sketch by Scimetar crossbow sketch by Scimetar
Well here I go again with another sketch of the mechanism. It's not finished, but shows the most important parts of the new layout.
Because I can't find any leafsprings, I now plan to use some coilsprings I still have.
In this new design the sinew is attached to the outer tips of two rigid throwing arms made of metal (blue parts). Every arm is fixed to the crossbow frame by a bolt (circle with the cross). The bolts alow the arms to rotate freely. The red connection rings attach the arms to the green coilspring. When the sinew is pulled back the arms move backward and extend the coilspring, storing a great amount of energy in it. The sinew is then held by the release mechanism, until the trigger of the crossbow is pulled.
The sketch only shows the "nut" of this mechanism [link]
For a sketch of the release system look here [link]

edit: added the loading mechanism. It's basically a crank used to pull the sinew. As always the cross indicates the fulcrum. And I removed the stupid nut because it looked ridiculous!
:iconanacondassuck:
Are you going to make the spring connection point lower than the arms? If the Spring is at the center of the crossbow and the arms are at the same level as the spring then the bolt would be blocked by the springs.

You also might consider attaching the springs forward of the pivot and to the front of the crossbow arms. Like this: [link]
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:iconscimetar:
There is a new sketch up showing the loading mechanism from the side. I guess adding random gears for unnecessary extra features will add to the steampunk look =D [link]
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:iconscimetar:
You found the most complicated problem of this design... I'm not sure yet how to solve that.
Btw I updated the pic and added some gearz =D
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