Introduction: Amazing Keychain (with a Bike Chain)

About: Electronic+Mechanical Engineering Student at National University of Colombia. Bike Mechanic and Cyclist

Hi! and welcome to my first Instructable.

Searching on internet about bicycle parts I found this keychain in the comments on the page made me think ... why not do it yourself?

Tools and Materials

  1. Keys
  2. Bike Chain
  3. Chain Rivet Tool
  4. Pressure/Locking Plier
  5. Cutting Tool (Mototool with carbide disk or Jewerly Saw)
  6. Drill with 7/16" Metal drill bit
  7. Abrasive Paper

Warning: this lifehack is not advisable if the key is subjected to a high torque in the lock

Step 1: First, a Little Explanation

The chain is composed of several parts: Outer plates, Inner Plates, Rivets, Rollers. Generally, the chain has a space between rivet and rivet of 1/2 "and depending on the use can vary the width of it. For bicycles with a single speed the roller is wider than a chain for multiple speeds.

For this tutorial, the goal is to replace the rollers with the keys.

Step 2: Organize the Materials

First, dissasembly the chain preventing the rivet from leaving one of the outer plates and separate the parts, select the keys to build the keychain, Keep in mind that the number of keys it's as the number of rollers.

The chain that I used I took the last change of chain of my bicycle, a KMC X10SL chain

Step 3: The First Hole

For precaution, the top of the key is retained and a 7/16 "hole is opened in the center of the key, with a file the hole is adjusted so that the inner plates fit very well. With the help of inner plate the edges are marked

Step 4: Cut the Keys

With the help of a mototool cuts are made to the key, you can also use a jewelry saw or a soft saw.

Step 5: Finish the "rivet"

Using the same mototool, or using jewelery files, the edges of the new rivet are polished so that their size is not greater than the edge of the outer plate. Using abrasive paper softens the edges

Step 6: Keychain Assembly

This part should be done with care, it is sought to reassemble the chain using the keys instead of the rivets, a way to do it quickly is with the help of a clamp of pressure, taking care that the rivet does not deform the outer plate. With the help of the chain tool you can adjust the rivet so that the key can move in the chain

Step 7: Test the Keychain

If the lock is in good condition, and the assembly has been correctly made, the chain will perfectly withstand the torque of the key. To increase this resistance can be used a thicker chain (this one is 5.6mm, 10 speeds) or fix the key in the chain by tightening the outer plates. When the assembly is not performed correctly or when the lock requires additional effort the chain does not resist and disarms

Step 8: ¿Optimize the Keychain?

Performing the instructable I thought, how close can you leave the chain in the key? Then note that the chain edge can serve as a stop for the key. (As the photos show)

Step 9: Same Steps, in to the Limit

To make the same key at the limit of its length, the key is marked with a straight line (marking the stop of the key) and the outer plate is placed as a reference and the same perforation and the same cuts are made as described from step 3

Step 10: Finish and Test the 2nd Version

There is an advantage when making the key this way, as it is much easier to assemble and occupy less space.

As shown in the second image, the chain serves as the limit for the key to fit correctly

Unusual Uses Challenge 2017

Runner Up in the
Unusual Uses Challenge 2017