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{{777}} ==Bike Chain Tensioner== Project developed by [[User:Spoonless]] {{Status|prototype}} ==Abstract== 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. [[File:ChainTensioner.jpg|200px]] == 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 for fabrication of the OSAT== # [[Delta_Build_Overview:MOST| MOST Delta RepRap]] or similar RepRap 3-D printer # Screwdriver # Adjustable Wrench or Pliers == Skills and Knowledge Necessary to Make the OSAT == * 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 in 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: [http://www.amazon.com/Bionicon-7640162290111-c-guide-eco/dp/B00HZRCZBS Bionicon C.GUIDE] approx. $30 ** 30 - (5.60 + 0.90) = $23.50 [[Category:How tos]] [[Category:Electricity]] [[Category:Electric lighting]] [[Category:OSAT 3D-Printable Designs]]
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