Modular hand held arm with "Backsaver" grip attachment"

Modular hand held arm with "Backsaver" grip attachment"

Project developed by Karan Dhankani

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Abstract

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

   

Bill of Materials

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

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

Skills and Knowledge Necessary to Make the OSAT

• Knowledge of FreeCAD and Cura

Technical Specifications and Assembly Instructions

- 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

• 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

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

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