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Seej Catapult Mod

by Wauter, published

Seej Catapult Mod by Wauter Jun 2, 2012
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Seej Catapult Mod by Wauter is licensed under the Creative Commons - Attribution license.

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Summary

I made some modifications to the original Seej penny catapult.

-the bottom of the arms was bumping into the table while loading the catapult, so I trimmed a bit of the arm below the bottom elastic bracket.

-I added an extra slot for the winding key and elastic further to the front of the catapult. This makes arms angle slightly steeper, which results in a slightly higer trajectory.

-Because i didnt have the right elastic, power was a bit low, to counter that I added some more elastic at the top of the catapult. To hold the elastic, I made an indent in the catapult arm and made the crossbar protrude a bit on both sides.

-Lastly, in case you grow tired of shooting pennies, I added a 'medieval' catapult arm. Shooting peanuts or perhaps a game of angry birds ( http://www.thingiverse.com/thing:11438 ) anyone?

The green catapult ha the original frame, with the modified penny arm.
The red canon is fully modified.

That stack of 'amunition' are actually 10x10x10 calibration cubes. They come in handy now :)

Instructions

For the original catapult only the stl files are provided. For the catapult arm, i hacked away at the original stl file in openscad. There was something wrong with the stl file for the side bracket, so i remodelled that. My openscad source files as well as zeng3's original stl files can be found in the zip file.

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I printed off a few of these for ammo. http://www.thingiverse.com/thing:15382http://www.thingiverse.com/thi... They fly really well. Nice Mod! Thanks

I think this catapult would work much better if the shooter arm actually pivoted on a cross member and you looped the rubber band over the top cross member then around the shooter arm.

Make it work like this one:
http://www.thingiverse.com/derivative:29540http://www.thingiverse.com/der...

Clever use of calibratin cubes.

I find the bottom pivot rubber band to be almost useless relative to the upper band. I'm thinking the bottom rubber band should be replaced with a solid bar that rotates in the frame.

I couldn't import either of them. I loaded the key in netfab, and it looks like there is some issue with the holes. I didn't really try very hard to fix it, just multiplied them in skeinforge instead.

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