1. e-NABLE Hand Test Rig P16061 David Schwartz, Tia Parks, Shannon Barry, Samantha Mason, Charles Rumfola

2. Agenda Background o Team o Stakeholders o Project Background o Problem Statement o House of Quality Functional Decomposition Concept Development Morphological Chart Pugh Charts Top Options Systems Architecture Feasibility o Cost o Electronic o Force o Rebuildable Designs and Flow Charts Major Issues Next Phase

3. Team

4. Stakeholders e-NABLE Global community of volunteers that collaborate to design and assembly 3D printed prosthetic hands and arms for children in need Jon Schull Founder of e-NABLE Skip Meetze Designer of e-NABLE prosthetics

5. Project Background Previously worked on by David Schwartz as an Independent Study Input force to make the hand grip Output force determined when fingers begin to move when pulled Data manually collected Designed for only one hand design and size Input Force Output Force

6. Problem Statement Current State o David Schwartz developed a prototype for measuring grip strength. It functions, but lacks the amenities desired for the final design. Desired State o A functioning prototype that can be used to test different types of e-NABLE devices. o Device should be able to be replicated because e-NABLE is a global and open source community. Project Goals o Analyze the current accepted methods of testing grip strength. o The apparatus must be:  Easy to Use  Portable  Cost Effective  Repeatable Constraints o Can’t disassemble the hand or break the hand in the process of measuring grip strength. o Cost of end product should cost under $200 to produce.

7. House of Quality

8. Functional Decomposition

9. Concept Development - Mount Hand Screw/Bolt on Mold Collapsable Shape Mechanism StrapUmbrella Mechanism Nesting Cylinders Clamp/Adjustable Wrench Modular

10. Concept Development Actuate Wrist: Sense Force: Motor/ServoTimer MechanismManually Sensors SpringsScale Dynamometer Strain Gauge

11. Morphological Chart

12. Pugh Chart vs Alpha

13. Pugh Chart vs Automated 1

14. Top Options Automated 1Automated 2

15. Systems Architecture

16. Designs and Flow Charts This is the system flow chart for both Automated 1 and 2

17. Cost Feasibility Assumptions: -Everything bought will work for prototype and won’t break -Don’t need highly accurate data collection (Cost Effective) Analysis: Estimated costs are derived from the required parts for the concept designs of Automated 1 and Automated 2. Automated 1 MaterialCost Clamp$20 Servo and Encoder$100 Force Sensors$35 (for 5) Arduino Uno$25 Total$170 MIS allowance (wires, bread boards, base, etc)$30 Automated 2 MaterialCost Clamp$20 Servo$30 Strain gauge (Includes sensor and "bars")$30 Microcontroller$7 Processor$70 Total$157 MIS allowance (wires, bread boards, base, etc)$43

18. Electronic Feasibility High level Understanding of Electronics Microprocessor- Processes Data Microcontroller- Control Motor Arduino- Controls motor and processes data Assumptions: -All controllers will be compatible with our other electronics -Users will have access to a computer with Excel or will be able to download and open source program Analysis: -Based on research and analysis we have found that Arduino is compatible with Excel

19. Force Feasibility What is an appropriate force range for the e-NABLE fingers so we can ‘size’ our sensors/dynamometer? Assumptions: -The e-NABLE finger strength won’t surpass that of an average hand -The force should be measured to the ounce -Size of hand will have a negligible effect on force, since e-NABLE pediatric hands are relatively the same size as adult hands Analysis: Testere-NABLE HandMax allowable force DynamometerBroke at 10lb200lb Schwartz Independent StudyMaxed out at 9lb25lb Strain Gauge-72-180lb (depending on the strain gauge) Force Sensors-22lb Conclusion: Tester doesn’t need to exceed 20lbs of force

20. Rebuildable Feasibility Assumptions: -Under $200 -Other engineers who will build this will have Basic programming knowledge Basic construction knowledge and tools Analysis: -Budget goals are met for both Automated 1 and 2 -Making prototype -Using easily obtainable items (ex. Walmart, Amazon) -Set-Up/Construction instructions for future users

21. Major Issues We don't have an Electrical Engineer- o This is becoming a problem because our group lacks some of the basic understandings of electronics, and one of our customer requirements is to be fully automated Printer availability

22. Next Phase Sub-systems design Research Arduino capabilities further 3D Print Hands - Raptor Reloaded Consider different types of motors (Servo versus Stepper)