Bike Thru Axle: Difference between revisions

Revision as of 06:09, 5 December 2019

Bike Thru Axle

Project developed by [jnbart]

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Abstract

This OSAT Project helps multiple goals, primarily goal 10 by helping to make bike transportation more accessible and to decrease the cost and increase the ability to repair a bike that has a broken axle. This part was designed to replace the original axle on my 2017 Raleigh Tokul 3 mountain bike, but could easily be modified to fit any "Thru" style bike axle.

This part features a hollowed center section to reduce the material used in the print, and otherwise uses a 75% infill for strength. The first iteration used a 50% infill, and due to that and a misplaced thread relief, it was not able to withstand the abuse of being ridden hard. The current model has been ridden and tested thoroughly, and has survived numerous hash riding conditions.

To further increase the durability of this part a higher infill percentage could be used, and to increase the usability a Hex keyway in the threaded end of the shaft would allow for the axle to be properly torqued more easily.

Bill of Materials

22 Grams of PLA Filament

Tools needed for fabrication of the OSAT

MOST Delta RepRap or similar RepRap 3-D printer
M12-1.5 Die to cut threads in the end of the shaft

Skills and Knowledge Necessary to Make the OSAT

3D printing basics
How to use a Die to cut threads

Technical Specifications and Assembly Instructions

Axle was printed with PLA with the length of the shaft in the Y direction
Printed at 215C and a heat gun was used to preheat the bed to reduce warping
Print Time: 1 Hour 46 Minutes with a 60mm/s print speed
After print is complete some minor filing/sanding may be required to ensure a tight fit to the hub and bearings
Use the die to cut threads on the end of the shaft. Do not cut them any farther than you need, as this will reduce the overall strength of the axle
Torque the axle to the bike manufacturers recommendation (mine was 6 Nm)

Example video summary of textbook
Error in widget YouTube: Unable to load template 'wiki:YouTube'

Cost savings

Total cost $0.375
Commercial Equivalent - $32.10 [1]
$31+ or 98.8% savings

Benefited Internet Communities

Transport
Sustainability
Green Living

@@ Line 22: / Line 22: @@
 == Tools needed for fabrication of the OSAT==
 # [[AthenaII| MOST Delta RepRap]] or similar RepRap 3-D printer
-#
+# M12-1.5 Die to cut threads in the end of the shaft
 == Skills and Knowledge Necessary to Make the OSAT ==
-* If you used special skill – link to relevant Wikipedia or Wikiversity articles/courses
+* 3D printing basics
+* How to use a Die to cut threads
 == 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.
+# Axle was printed with PLA with the length of the shaft in the Y direction
-# Include print time estimate
+# Printed at 215C and a heat gun was used to preheat the bed to reduce warping
-# Include assembly time estimate
+# Print Time: 1 Hour 46 Minutes with a 60mm/s print speed
-# Including drawings or pictures of the device at stage of assembly at minimum. (http://www.appropedia.org/Special:Upload)
+# After print is complete some minor filing/sanding may be required to ensure a tight fit to the hub and bearings
-# Consider video if appropriate
+# Use the die to cut threads on the end of the shaft.  Do not cut them any farther than you need, as this will reduce the overall strength of the axle
+# Torque the axle to the bike manufacturers recommendation (mine was 6 Nm)
 {|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>
@@ Line 40: / Line 42: @@
 |}
-=== Common Problems and Solutions===
-* Include common mistakes/problems to avoid in building your OSAT and how to overcome them
 == Cost savings==
-* If your solution is not a low cost one then it is not really appropriate.
+# Total cost $0.375
-# Estimate your costs
+# Commercial Equivalent - $32.10 [https://www.jensonusa.com/DT-Swiss-RWS-Thru-Axle-Boost-12-X-148mm-1737mm-Length?pt_source=googleads&pt_medium=cpc&pt_campaign=shopping_us&pt_keyword=&gclid=EAIaIQobChMIoZzCieqd5gIVjJ6fCh03_Q26EAQYBCABEgJX7fD_BwE]
-# Find a commercial equivalent, cite it and put the [url in square brackets]
+# $31+ or 98.8% savings
-# Calculate $ savings and % savings
 == Benefited Internet Communities ==
-* Name and add links to at least 5 using single brackets around [url name]
+# Transport
+# Sustainability
+# Green Living
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 [[Category:Projects]]