Bungee Ballista Part 4 PDF Print E-mail
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Tuesday, 27 October 2009 04:11

Bungee Ballista Part 4 -- Construction

 

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Construction of the Bungee Ballista

wood pieces

   The first step was to gather some materials.  The main beam of the ballista is a 12 foot 2x8 board, selected carefully to be straight and have no major knots.   There will be up to 500 pounds of force trying to snap this board so it is important that this beam have no weakness.

   To stiffen this board, there are also a couple 8 foot long 1x4 pine boards, and a bottom piece which is a 1x8.  These boards are very light, however when attached properly will make the basic structure very rigid like an I-Beam.

   The bicycle wheel is there to get an idea of how large the cross member on the front will have to be.


 

Cutting Top

This 1x12 board used to be a wooden shelf.  It will now be the top piece of the cross member that the wheels are mounted in.


 

sawing a board

   The tools and materials which were most important for this project were:

A hand saw.

Workbench.

Hand Drill with built-in levels

A drill press -  Really nice for making perfectly straight up&down holes.

A carpenter's square

Drill bits going up to 3/8" in diameter

A set of self-cut flat wood bits for larger holes

3/8" Carriage Bolts

1/4" Carriage Bolts

1.5" and 2.5" deck screws

 

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Last Updated on Thursday, 29 October 2009 02:18
 

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