Title of the device or system

Project developed by Jason Werthman [1]

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Abstract

In areas of the world with limited manufacturing capabilities and limited monetary resources, coming by basic hand tools can be more difficult than it is here in the US. This specific item is a hammer that can be 3D printed, with a bolt and nut(s) being used to assemble the parts as well as act as the striking surface and add weight to the hammer. Obviously, a fully 3D printed hammer is not a super realistic tool to produce with what is realistically available to most individuals around the world in terms of 3D printing outside of industrial settings. However, with the availability of printers that can at least print in PLA expanding with their costs falling, this is a more realistic way for anyone to produce a hammer.

Outside of being easier to access for resource deprived areas of the world, this could be used by anyone who may want a lot of different size hammers for a low price, I myself am going to be making several as the cost of filament is low, at 71 grams of filament used to produce my first one costing me ~$1.42 US to produce a larger size, using bolts that I already have laying around. With bolts/nuts being an extremely common fastener that literally holds a large part of the world we live in together, they should be fairly easy to come by almost anywhere and the SCAD code is written in terms of variables all commented at the top to allow for extremely easy adjustments of sizing to fit any use case.

This design was kept as simple as possible to ensure any level of printer can produce it with the minimal amount of material usage, reducing the size of the pla head that functionally only needs to locate the bolt also minimizes the change of tool failure due to a missed swing, as the head of the bolt covers most of the hammer head.

Bill of Materials

  1. PLA Filament, ~71 grams for the design as posted, this is subject to change based on the size of the hammer being printed, ~$1.42
  1. 9/16"x5"-12 bolt for the design as drawn, this can be changed to whatever hardware is available with simple edits to variables at the top of the code that are clearly commented. Thread pitch is not important as long as it matches the nut, the hammer is made with a clearance hole to be through bolted. ~$3.41 for a Grade 8 identical to what I used if bought at the inflated price from Mcmaster Carr
  1. 9/16" nut to match thread pitch of bolt, I assembled mine using a 12 TPI coarse thread as that is what I had on hand, but again the thread pitch is not critical as long as the nut and bolt match ~$0.29 for the 9/16-12 Grade 8 nut I used from McMaster Carr, Grade 8 hardware is honestly more than overkill for this and McMaster carr prices are higher than anywhere else, using this exact hardware configuration is not critical.

Tools needed for fabrication of the OSAT

  1. MOST Delta RepRap or similar RepRap 3-D printer

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.
  2. Include print time estimate
  3. Include assembly time estimate
  4. Including drawings or pictures of the device at stage of assembly at minimum. (http://www.appropedia.org/Special:Upload)
  5. Consider video if appropriate
Example video summary of textbook
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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
  2. Find a commercial equivalent, cite it and put the [url in square brackets]
  3. Calculate $ savings and % savings

Benefited Internet Communities

  • Name and add links to at least 5 using single brackets around [url name]

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 [[Category:How tos]] [[Category:Electricity]] [[Category:Electric lighting]].

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