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Modular hand held arm with "Backsaver" grip attachment"

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MOST Delta filament as guide.JPG This page was part of an MTU course MSE4777 OA and MSE4777 OB/MSE5777/EE4777/EE5777: Open-source 3-D printing

Please leave comments using the discussion tab. The course runs in the Fall semester. It is not open edit.


Modular hand held arm with "Backsaver" grip attachment"[edit]

Project developed by Karan Dhankani
Status
This OSAT has been designed but not yet tested - use at own risk.
This OSAT has been prototyped.

You can help Appropedia by contributing to the next step in this OSAT's status.

Abstract[edit]

With a modular setup, this device can be used as multiple tools in one. Main applications could be for people from third world countries where there is minimal automation. A shovel helper grip attachment could save a lot of effort by transferring some of the load from the user's back to the well gripped other hand. This in-turn results into lesser fatigue and more productivity.

Also, the Leaf Claws attachment can function as a big sized leaf collector hand or as even a shovel for damp yards. These type of attachments could also be used to reach certain areas (eg: for maintenance purposes in sanitation) where use of bare hands could have caused infections.

  1. Picture of completed print using
    Wood WorkingClamp Parts.png

Bill of Materials[edit]

  1. 3 bolts: 5/16 inch diameter with approx 5 cm length: 38 cents x 3 = USD 1.14
  2. 3 Nuts that fit into those bolts: 21 cents x 3 = USD 0.63
  3. Hair band / Rubber band: Free?
  4. PLA filament: Approx 50 x 3 grams = USD 3.2

The STL files and FreeCAD files for the parts can be found here:


Tools needed for fabrication of the OSAT[edit]

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

Skills and Knowledge Necessary to Make the OSAT[edit]

  • Knowledge of FreeCAD and Cura

Technical Specifications and Assembly Instructions[edit]

- To Assemble: -

  1. Download the part files provided above in the bill of materials
  2. Convert stl files to gcode using software like Cura
  3. Print all of the Parts
  4. Attach a hair band / rubber band with the handle arm to make it a comfortable grip on the user's wrist
  5. Connect the interlocking jaws of whichever tool you want to use
  6. Secure with nut and bolt

- Time:

  • Total print time estimate: 5 hours
  • Total assembly time estimate: 3 minutes

Common Problems and Solutions[edit]

  • One must be careful of your printer radius and calibration as a couple of those parts only just fit into my Delta: check how thw first couple of layers print and shrink the models if needed (all be same amount)
  • Sticking to the bed could be a common problem in case of such large prints: Use high quantities of washable glue on bed before printing

Cost savings[edit]

  1. Cost Estimate: USD 5 for two tools
  2. Equivalent products in market cost: USD 33 (Backsaver grip: USD 13 and Leaf claw: USD 20)
  3. Net savings achieved: USD 28

References[edit]

  • 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

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