Editing Bike Chain Tensioner

[[File:ChainTensioner.jpg|thumb]]

{{Project data
| authors = User:Spoonless
| years = 2014
| made = Yes
| replicated = No
| cost = USD 6.5
}}

{{777 notice}}

This chain tensioner can be used to address issues with chain hopping, chain slap, and rattles. It can be printed and assembled for less than $6, and offers equivalent perfomance to comercial products sold for $30.

== Bill of Materials ==

# [https://github.com/SpoonlessCorey/OSAT_BikeChainTensioner Tensioner.scad]
# (2) ZipTies
# (1) 8-32 Thread, 1-1/4" Length Machine Screw (eg. [http://www.mcmaster.com/#91792a201/=uvhjkl McMasterCarr:91792A201])
# (1) 8-32 Thread Locknut (eg. [http://www.mcmaster.com/#91831a009/=uvhlvw McMasterCarr:91831a009])

== Tools needed ==

# [[Delta Build Overview:MOST|MOST Delta RepRap]] or similar RepRap 3-D printer
# Screwdriver
# Adjustable Wrench or Pliers

== Skills and knowledge needed ==

* Ability to use a 3d printer.
* Ability to use a wrench and screwdriver.

== Technical Specifications and Assembly Instructions ==

All parts are symetric such that component orientation is not an issue.

Assembly:

# Ziptie the cage to the Bicycle frame just above chain.
# Hold the chain up so it is captured by the cage.
# Bolt the pully in place
# gently crank the pedals by hand and shift throug all gears to ensure nothing is binding

=== Common Problems and Solutions ===

* If the fit to they bicycle is loose or overly tight the OpenScad variable "pipeDia" can be set to match your bike frame's tubing diameter.

== Cost savings ==

* Approximatly $23.50 (78.3%)
** 30g of PLA at approx. $30/kg = $0.90
** Machine Screw, Locknut, and bag of zip ties approx $5.60 at local hardware store
** Equivalent Chain Tesnsioner: [https://www.amazon.com/Bionicon-7640162290111-c-guide-eco/dp/B00HZRCZBS Bionicon C.GUIDE] approx. $30
** 30 - (5.60 + 0.90) = $23.50

{{Page data
| keywords = 3D printing, bicycle, bike chain tensioner, osat, plastic
| sdg = SDG08 Decent work and economic growth
| published = 2014
| organizations = MTU, Michigan_Tech's_Open_Sustainability_Technology_Lab, MY4777
| license = CC-BY-SA-3.0
| language = en
}}

[[Category:OSAT 3D-Printable Designs]]
[[Category:3D printing]]
[[Category:Plastic]]