Bike Chain Tensioner: Difference between revisions

Revision as of 11:02, 4 December 2014

Title of the device or system

Project developed by [your name linked to your user account]

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Abstract

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

Bill of Materials

(2) ZipTies
(1) 8-32 Thread, 1-1/4" Length Machine Screw (eg. McMasterCarr:91792A201)
(1) 8-32 Thread Locknut (eg. McMasterCarr:91831a009)
1. Upload and link to all STLs

Tools needed for fabrication of the OSAT

MOST Delta RepRap or similar RepRap 3-D printer
Screwdriver
Adjustable Wrench or Pliers

Technical Specifications and Assembly Instructions

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

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: Bionicon C.GUIDE approx. $30
- 30 - (5.60 + 0.90) = $23.50.

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@@ Line 23: / Line 23: @@
 # Screwdriver
 # Adjustable Wrench or Pliers
-== Skills and Knowledge Necessary to Make the OSAT ==
-* If you used special skill – link to relevant wikipedia or wikiversity articles/courses
 == Technical Specifications and Assembly Instructions==
-# Provide directions for print/assembly - be detailed enough in your “how to” to ensure that someone could construct the device from your description. Consider the elegance of IKEA like instructions.
+# Ziptie the cage to the Bicycle frame just above chain.
-# Include print time estimate
+# Hold the chain up so it is captured by the cage.
-# Include assembly time estimate
+# Bolt the pully in place
-# Including drawings or pictures of the device at stage of assembly at minimum. (http://www.appropedia.org/Special:Upload)
+# gently crank the pedals by hand and shift throug all gears to ensure nothing is binding
-# Consider video if appropriate
-{|style="border:1px solid #73BF73; background-color: #E6FFE6; margin-left:.1em; margin-top:2px; -moz-border-radius:15px;" align="right" width="150px"
-!<big>Example video summary of textbook</big>
-|-
-|<center>{{#widget:YouTube|id=yiJDx9dCfEQ}} </center>
-|-
-|}
-=== Common Problems and Solutions===
-* Include common mistakes/problems to avoid in building your OSAT and how to overcome them
 == Cost savings==
@@ Line 49: / Line 36: @@
 ** Equivalent Chain Tesnsioner: [http://www.amazon.com/Bionicon-7640162290111-c-guide-eco/dp/B00HZRCZBS Bionicon C.GUIDE] approx. $30
 ** 30 - (5.60 + 0.90) = $23.50
-==References==
-* The sources of information (e.g. engineering handbooks, journal articles, government documents, webpages, books, magazine articles etc.). References should use the <nowiki> <ref> </ref> and <references/>  </nowiki>tags and can be in any format but should include all the information necessary for someone else to find the same information you did. For example: <ref> web page: Department of Energy (DOE) Landscaping and Energy Efficiency, DOE/GO-10095 (1995) Available: http://www.eren.doe.gov/erec/factsheets/landscape.html</ref>
-<references/>
-<nowiki>
-Based on the developmental needs addressed (e.g. food, heat, electricity, clean water, health  care, etc.) be sure to label your device in the proper categories e.g. use [[Category:Water]]. Be sure to categorize your device so that it will be easy to find – for example “Low voltage connection basics” is categorized in