I had only one night to build a machine capable of launching an anti-stress ball, with adjustable height. So, I combined a plastic beer jar (marketing stuff from a colombian beer named "Costeña"), a toilet tree for the elevation and other stuff for the frame. It works with two spings, like some type of slingshot. You charge the mortar, lock the trigger, push the trigger and it launch the ball.
By building this Spring-Action Mortar, students will be able to build a educational project reusing stuff and analize the physics of launching a projectile with parabolic trajectory.
Step 1: Materials and stuff
You will need the following materials:
- Acrylic beer jar
- Sheet made of acrylic or another hard plastic.
- Electric shower case, that fits in the jar mouth.
- Two springs (for the "slingshot")
- One smaller spring (for the trigger)
- One PC screen base
- Two printer pieces (for the mortar mount)
- Toilet plastic floater graduating piece (tree)
- Metallic angles
- parfum round cap
- bolts and screws
- Two key chain rings
- round telephone cover
- vents (for fixing the mortar to the ground)
- anti stress balls
1. If you don't have it, replace it!
2. Use protective equipment (dust mask and goggles)
3. Beware of drilled and soldered hot surfaces
4. Work in a good ventilated area.
5. Always have junk in stock
Step 2: The Barrel
Make two grooves, each one opposed to the other. They will be the rails of the launcher.
Fit the shower case to the jar, and glue or fix with screws.