3 Axis arms This Will show details and information on how I build the 3 axis arms used in out haunt last year. Including alittle info the 2 version that came before them.

Caution: Be carefull when working with metal, drills, and air pressure they can be dangerous, if you decided to build do so at your own risk.

What you will need:
1. 2 large slide hinges of an old door

2. 2 caster wheels with the wheel removed

3. 6 pneumatic pistons with 2" stroke and valves to run it all

4. Assorted nuts and bolts, Lock nuts are highly recommended

5. Hose to hook everything up

6. Drill, Saws all, socket set, Chain breaker

7. Some small bike chain

The first time I built these arms I started with just one arm with 2 pistons and very limited motion. Each year since they have undergone a complete rebuild, Now there are 2 arms with 3 axis movement using 6 pneumatic pistons. I will provide details on how I build the third version.
I started on this design last halloween, and managed to get a 2 axis set working for the season, with the extra time i have i decided to add the 3rd axis. The design is based on a caster wheel. You start by cutting the wheel out leaving you with the caster frame this will allow you to have the arm rotate and piviot.
I drilled a small hole at the top of the caster to attach a piece of bike chain to pull it back raising the arm, This makes adding the other motion very simple. The other end of the bike chain is attached to a 2" pneumatic piston That will pull the chain causing the caster to rotate.
You need to drill another hole in the caster that will be for attaching the piston that will move the arm out. This will attach about half way down the arm and to the back of the caster, when the piston is activated it will push the arm away from the frame
The Last piston that will be installed is for the elbow, This one is simple. you mount on end of the piston to the lower arm, and then the other half to the upper arm, to avoid and binding issues, I cut 2 small metal brackets, to move the piston away from the arm. These just bolt to both sides of the arm and the piston gets bolted in the middle.
These are still a work in progress but they will be done in time for this years haunted house.
I took alot of pictures that should help clarify how everything get put together and moves.

Things that still need to be done:
Add air lines
Add hands
Add foam to the arms to give them shape

Arms:

Older Version are Here:
Version 1:

Version 2:

Any questions or comments email: joshua14ss@hotmail.com

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