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How to make a spring crossbow

Category: DIY weapon / DIY guns

How to make a spring crossbow

Spring crossbow

difficultyDifficulty: ★★★★☆

timeTime: Couple of days

ScrapFrom scrap: ████░░░░░░ 40%


PreamblePreamble

Could you imagine crossbow without bow? Such crossbow uses an energy of expanded spring. So here is a my story about how to build a spring crossbow.


MaterialsMaterials

  • A powerful springs
  • Steel pipes
  • Metal parts
  • Planks
  • Plywood
  • Bearings
  • The steel axle
  • Sheet metal
ToolsTools

  • Hacksaw
  • A set of mounting tools
  • Drill
  • Emery
  • Glue
  • Files

    Design of spring crossbow


  • Springs

    In this diy crossbow I used an energy of two 15-kilogramm springs
    How to make a spring crossbow

  • Tubes

    Springs placed into two tubes, connected with metal plate
    How to make a spring crossbow

    How to make a spring crossbow

  • Trigger

    Trigger system is complex: all force is in a part which connects tubes. Secon trigger system is for bowspring
    After pulling the trigger tube connector will free, and after short delay release a bowstring

  • Sheme

    Scheme of diy spring crossbow


    How to make a spring crossbow

  • Preassembled

    How to make a spring crossbow

    How to make a spring crossbow

    How to make a spring crossbow

    How to make a spring crossbow

    How to make a spring crossbow

    How to make a spring crossbow

    How to make a spring crossbow

    How to make a spring crossbow

  • Body

    I made a body of wooden board
    How to make a spring crossbow

    How to make a spring crossbow

    How to make a spring crossbow

    How to make a spring crossbow

    How to make a spring crossbow

  • Pulleys

    I made plywood plates and fastened them into forward part of crossbow
    How to make a spring crossbow

    How to make a spring crossbow

    How to make a spring crossbow

  • Bearing

    Plywood plates serves as decoration and as mount for bearings for pulleys
    How to make a spring crossbow

  • String brake

    Also I mounted bowstring brake on them
    How to make a spring crossbow

  • Buttstock

    For usability I made a buttstock
    How to make a spring crossbow

    How to make a spring crossbow

  • Clamp

    Also I made a clamp for ease reloading of spring crossbow
    How to make a spring crossbow

  • Bolt press

    How to make a spring crossbow

    How to make a spring crossbow

  • Pulleys

    How to make a spring crossbow

  • Result

    How to make a spring crossbow

    Author: deminpetr74

VideoVideo

This is not the only design of spring crossbow. The author of the following video insists that his spring crossbow has tension force of 1800 lbs!!!

ResultsResults and tips

  • Crossbow turned out interesting, but quite weak.
  • The tension on the string 15 kilograms.
  • Arrow weighing 30 grams flying straight at fifty meters.
  • I think I need to replace the springs with more powerful air springs, they also has less inertia.

Tags: crossbow

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