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Mouse Trap Catapult

This craft comes from Scouter Jeff at The Trainer’s Corner Blog.  The first idea for a mouse trap catapult was simply a plastic spoon taped to a mousetrap. This catapult is so much better and I was super excited to build it. My son and I put this together in about and hour and it is pretty awesome. We had a lot of fun playing with it after it was built. We’re actually planning on building a target to turn it into a game.

Materials:

  • Mousetrap (bait holder and hold down bar removed)
  • 15″ 1″x4″ piece of pine (base)
  • 2x 6″ 1″x4″ pieces of pine (sides)
  • 5″ 1/2″ diameter dowel (crossbar)
  • 2″ 1/2″ diameter dowel (firing pin)
  • 2x wooden paint stirrers (firing arm and holder)
  • 2x 1/2″ long #6 wood screws
  • 4x 3/4″ long #6 wood screws
  • 6 finishing screws
  • 2x #6 eye bolts (trigger mechanism)
Tools:
  • Screwdriver
  • Drill (w/ various bits for pre-drilling plus 1/2″ bit for crossbar)
  • Saw
  • Hammer
Obviously power tools such as a miter saw or circular saw and a power screwdriver/power drill will make things easier.

 

Instructions:
  • ** Screw the mousetrap to the baseboard at one end in the center.
 
  • Drill a 1/2″ hole in the side pieces (A drill press will make this easier. However I do not have a drill press so I clamped the sides together with some large 2″ spring clamps and then drilled them).
  
  • ** Hammer the sides to the front of the baseboard near the mouse trap about 2″ away from the front

  • Measure the paint stirrer distance from the mouse trap spring. If necessary saw enough off so that the end of the paint stick is about 3-4″ from the back end of the base board.
  • Cut two small pieces off another paint stirrer wide enough to cover the mouse trap bar.
  • ** With the two 1/2″ #6 wood screws, screw one of the pieces to the paint stirrer firing arm.  Place the firing arm piece over the mouse trap bar and the second piece underneath the bar and screw them all together
 
  • ** Screw the two eye bolts to the back of the baseboard about 1-2″ apart from each other. Make sure that the firing arm does not collide with the front eye bolt.
 
  • Slide the firing pin through eye bolts. Lower the firing arm and make sure the firing pin covers the end of the firing arm. Mark a spot on the pin between the eye bolts and screw in a 3/4″ #6 wood screw.
  • Attach a small piece of wood to the end of the firing arm with wood glue for holding the whatever is being fired in place.
  • Slide the crossbar dowel into the holes drilled through the sides
 
 
** Items marked with the double asterisk indicate you should pre-drill these holes.

Achievements Completed:

  • Wolf #5e
  • Wolf Elective #4e
  • Bear #20a
  • Webelos Engineer #9
 
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2Responsesto “Mouse Trap Catapult”

Comments

  1. Scouter Jeff Says:

    I’m glad you liked the mousetrap catapult plans. I hope you had as much fun as me and my sons and their dens had we these. Thanks for the post to my old Cub Scout blog.

    You have a great site here. Keep up the great work! Good luck on your Scouting adventure:

    Yours in Scouting,
    Scouter Jeff <

  2. Cubmaster Says:

    @Scouter Jeff – Thank you very much. Yes, we had a blast with it. It works great and all the boys got a real kick out of it.

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