Spring Powered Bow, Simple But POWERFUL!

Today I show you, how to make a simple but powerful bow. Making the limbs out of something flexible is a pain,

even finding good material for it. We just use tough metal and some wood :>

Material / tools:

- Jigsaw

- Drill

- soldering iron, laser module, Li button cell, solder and 2 pieces of wire (optional)

- M5 screws and nuts (or similar)

- 2 STRONG (!) tension springs (mine are 40kg /75lbs)

- Bow string (I used 48 inches long string found on ebay for 5 bucks)

- Short pieces of tubing, 5mm inner diameter at least, 15-20mm long

Step 1: The Grip, Made From an Old Shelf

You need a saw and a drill (5mm if you, like me, use M5 srews and nuts). Print out the template, make sure its around 270mm long) and glue it on the plank, then cut it out, file the edges, sand em, and we are ready to move on.

Step 2: The Limbs

4 identical (nobody said it needs to be PERFECT though) pieces of Aluminum, 4-5mm thick.

Cut out, add a tubing in the middle to keep the right distance. Length depends on the thickness of

your wood (gnihi).

Make sure there is a tubing at the tips, attaching the string to a threaded rod / screw won't work for long,

so cover it with.

Step 3: Reinforcement-plates

Cut out 4 of them, the outlines match the outlines of the grip. 2 holes through one of them,

put it on your grip, mark the holes, drill through and don't forget the springs. Repeat, and off to the next step!

Next and last step is the bow string. I attached it to one end, across the tips and back into the limb,

where I drilled an additional hole (2 holes), to make sure there is a basic tension on the bow.

Step 4: Instructional Video

Showing most of the steps, not in detail, because it really depends on your springs.

Now go for it, its worth the time and effort ^^

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23 Comments

This dude

Question 1 year ago on Introduction

where can I buy these springs

montyryanbrent

2 years ago

Do you think It would be likley to break if the arms were made from 2MM aluminium?
If I had Stronger springs would I need to make the arms longer?

HamzaK36

5 years ago

Do you think that a better version of the bow you made is approved in the competitions?
I have an other question, how many lbs your bow can manage when you want to shoot and at how many lbs a bow like this can arrive if built even better?

michaels52

5 years ago

is it capable for hunting?

JosephY18

5 years ago

i don't care what anyone says. that thing is cool as hell

HamzaK36

5 years ago

I am planning to build a bow the next month. But I don't know if a bow powered by springs is approved during the competitions. I want to build a really really powerful bow and to now the lbs of yours may be interesting. Can you build the next version before the end of June? It'll be amazing.