I know that the first thing I did after seeing this video was make a list of everything I needed and head to the store. So here’s what you’ll need: A 9V battery, battery clip, hot glue, a small motor, a 2 terminal switch, tape, a ballpoint pen, a hammer, scissors, and a knife. While that may sound like a lot, you should be able to find most of that around your house, and the rest at your local hardware store.
It is actually a fairly simple design, and in the video he uses it to cut through some fairly tiny sticks of wood. You could probably cut through a 2×4 with this, but it would likely take you several hours, and many batteries of work. The one nice thing about this design is that if your bottle cap blade ever dulls down, simply pull it off and hot glue another one right on.
While you’re looking for a motor too, the MOXER drive motor available here, could be incorporated into this build as well to fully automize the cutting process.
Every engineer is going to love spending their afternoon creating this fun little tool, even if they don’t have anything to use it for. Having a pocket saw seems just like the thing you might want to keep handy in case the zombie apocalypse comes knocking at your door. Stay tuned to Interesting Engineering to check out more awesome DIY projects to tackle in your future free time.