Lightweight Wrenches

Project developed by Jackie Mayrose

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Abstract

  1. Paragraph description of the OSAT - why is it Appropriate? What need does it fulfil? Are there case studies you have found of a technology being used successfully?
  2. Picture of completed print using
    File:Name-of-your-image.png

Bill of Materials

1. Your choice of filament

    • Based on printer capabilities, cost, availability.
    • Parts shown printed in PLA. ABS is probably best.

2. [broken Thingiverse OpenSCAD files]

    • Editable OpenSCAD file for making different size wrenches
    • Common sizes of wrench also in STL

Tools needed for fabrication of the OSAT

  1. MOST Delta RepRap or similar RepRap 3-D printer
  2. Utility/hobby knife or similar (small saw)
  3. Pliers optional but helpful

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

  1. 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.

Time Estimates

  • Varies based on wrench size
  • 13mm wrench ~1.5 hours printing plus ~20 minutes assembly
  • 3mm wrench 10 minutes printing plus ~15 minutes assembly

Printing

  • Slicing program - load model, lay flat
  • With support, touching buildplate
  • Wall thickness, top/bottom thickness ~1mm
  • Fill at least 10%

Slicing app.PNG

Finishing

  • Remove support on box end with knife/pliers/etc.
  • Smooth underside of wrench if necessary
  1. Including drawings or pictures of the device at stage of assembly at minimum. (http://www.appropedia.org/Special:Upload)

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.
  1. Estimate your costs
  • Commercial 22-piece combination wrench set: 28.99 USD
    • ~1.30 USD per wrench
  1. Calculate $ savings and % savings

References

  • The sources of information (e.g. engineering handbooks, journal articles, government documents, webpages, books, magazine articles etc.). References should use the <ref> </ref> and <references/> 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: [1]
  1. web page: Department of Energy (DOE) Landscaping and Energy Efficiency, DOE/GO-10095 (1995) Available: http://www.eren.doe.gov/erec/factsheets/landscape.html

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

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