Centrifugal Airsoft Pen Machine Gun

Step 5: Build the motor platform and circuits...

Building the motor platform and awesome aluminum double-sided tape circuits...

The motor platform is built from two pieces of corrugated cardboard.  I secured the motor to the cardboard by saving the mounting screws from the motor that I harvested from a broken portable DVD player. After putting a piece of tape on the top of the cardboard to prevent tare-through I poked three small holes that corresponded with the drive shaft and two motor mounting holes and screwed the motor on with the above mentioned screws.

To create the circuit that would connect the battery and motor to the magnetic trip switch I used a marker and drew out the circuit on the cardboard first. Then I laid double sided tape over the lines I drew.  Then I placed a piece of aluminum foil over the double sided tape so no double sided tape was left uncovered.  Using an exacto knife I cut out the aluminum foil that was not connected to the double sided tape.  Then I covered the circuit with clear tape to prevent accidental shorts. I DID NOT cover the ends of the circuit where I needed to make connections.

note: I really like the aluminum foil / double-sided tape combination for a circuit.  While I am sure it's been done.  It was new to me, and I was proud that I thought of it on my own. 

I mounted the motor / 9 volt battery assembly, and the magnetic trip switch with the double sided tape.  I used clear tape to secure all the motor leads an other connections down.  I also used tape to secure the cardboard around the 9 volt battery.

Note: While you are working with the magnetic trip switch you should place a piece of  cardboard in between so that the switch can't close the circuit.