Instructables

MAKE A SPRING-ACTION MORTAR WITH ADJUSTABLE HEIGHT (using a plastic beer jar and discarded stuff)

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Picture of MAKE A SPRING-ACTION MORTAR WITH ADJUSTABLE HEIGHT (using a plastic beer jar and discarded stuff)
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A few months ago, I had to help a cousin of mine with a college homework about the physics of parabolic trajectory. He's really good at math, but very bad at crafting. It was my turn to save the day!!

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.

LEARNING OBJECTIVE:

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.
 
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Step 1: Materials and stuff

Picture of Materials and stuff
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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)
  • Hinge
  • Metallic angles
  • parfum round cap
  • bolts and screws
  • Two key chain rings
  • round telephone cover
  • vents (for fixing the mortar to the ground)
  • vaseline
  • anti stress balls
TOOLS:
  • Dremel
  • Screwdivers
  • Pliers
  • Tweezers

And remember:

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
6. Enjoy!

 
     

Step 2: The Barrel

Picture of The Barrel
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Cut the shower case in the way showed on the picture. It will be the mortar muzzle, and later you will fix the springs to it.

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.
freeza361 year ago
I built something similar to this with a ton of rubber bands and those plastic planters that you buy plants in. It didn't work too well, but shooting legos at people was always great fun.
Edgar1 year ago
Nice work!
Did you realize you have here the makings of a Dog's Toy Ball thrower?
I mean, you can set the thing to throw the ball REAL far away, so the pooch can exercise to it's heart content, without you being bored or tired...
M.C. Langer (author)  Edgar1 year ago
WOW!!! IT'S AN AMAZING IDEA!!! Thanks!! :-)
randomray1 year ago
Nice job . I liked all the pictures you had . I also liked that you made it from stuff just laying around and didn't need any expensive tools to work on it .
M.C. Langer (author)  randomray1 year ago
Thanks Randomray!! :-)