Rubber Band Gun

About: I am IT professional, living in Bangalore, India. As new gadgets come out everyday, we indulge in spending significant time and money on these gadgets. And our kids are learning from us, they know how to use...

I came across "Slivki Show" on youtube, where the host shared "10 awesome gadgets to buy from Aliexpress"

I was really amazed by few for these gadgets, one of them was a rubber band gun. I did not know of such gadget existed and wanted to have it... Ordering from Aliexpress would mean to wait for few weeks and I did not want to wait. The construction looked simple, so I did an extensive research for few hours and decided to make one..

In this instructable, I will share how I made one using scrap wood, Jig saw and sandpaper

Please vote for me

Step 1: What Do We Need ?

Materials and Tools

  • 5 mm plywood
  • 10 mm plywood
  • Spring from old pen
  • Tooth picks
  • PVA glue / Fevicol
  • G Clamps
  • Sandpaper
  • Nail filer ( borrowed from my wife's drawer)
  • Jig Saw
  • Screws

Step 2: Design

  • My Design is inspired by RBGUNS.com... at least the overall logic
  • I am not using any software here so sharing my hand drawings
  • Key changes
    • Shape
    • Dimensions
    • Trigger is spring based not rubber band
    • Screws for tweaking / maintenance
    • In short changed the everything design
  • Why did I make my own design
    • I did not want to cut multiple plywood and stick them, as I am not skilled enough
    • I had just enough 5 mm and 10 mm plywood
  • Mechanism
    • The rubber bands are held in place using the teeth on the body
    • when the trigger is pressed, it pushed the rubber band outwards to skip the tooth and move to the next one
    • To avoid too many skips, the trigger must also have teeth
    • When the last tooth is skipped the rubber band shots off

Step 3: The Body

  • Draw the template from previous step on a A4 sheet
  • paste them on the wooden planks using glue-stick
  • Cut the left , right side and the middle parts of the body as shown
  • Glue the middle and right side and leave to dry for 2 hours
  • Screw the left side as shown, this will help us to tweak and maintain
  • Sand the edges down with a 80 grit sandpaper and then 180

Step 4: Trigger

  • Since I didn't use any software, I had to construct the body first and then make the trigger
  • Trigger needs to move back and forward without wobbling and with enough space to trigger rubber band skip teeth
  • Mark the min and max teeth space as shown in the picture
  • Cut the teeth in the trigger, which is offset by half of the distance between teeth
  • Drill a hole from the body in to the trigger as shown
  • Add a small spring to push the trigger front
  • Secure using a toothpick, this avoids wobbling too

Step 5: Test and Lessons

The tests went well, I have added a video in the first step
I have shared a video

Lessons

  • The trigger needs to push rubber band further by 5mm
  • If you cut the teeth incorrectly you can use match sticks or popsicle sticks to correct them
  • Sand the teeth on the body by 45 degree or more
  • Rubber bands have to be with good elasticity, old rubber bands do not work well
  • Teeths does not have to be taping, they could be just grooves, which will reduce a lot of effort

I liked making this project, please share if you have a better design that I could try out with more than 10 rubber bands

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