e-NABLE Hand Test RigP16061David Schwartz, Tia Parks, Shannon Barry, Samantha Mason, Charles Rumfola

Agenda

- Introduce Team- Project Background - Problem Statement- Use Scenarios- Customer Requirements- Engineering Requirements- Risks- Project Plan (Draft)

Team

e-NABLE

• Global group of volunteers that collaborate to design and assemble 3D printed prosthetic hands and arms for children in need

• Jon Schull o Saw a Youtube video of a prop

maker giving a 3D printed prosthetic hand to a child from South Africa

o Founder of the movement

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

Inpu

t F

orce

Output Force

Problem StatementTwo years ago, a research scientist and the director of the MAGIC ACT initiative at RIT, Jon Schull, saw

a Youtube video of two men that connected to make a 3D prosthetic hand for a little boy in South Africa. The Google+ community, called e-NABLE, was born from Schull’s idea that many people would benefit from and/or become aware of the movement of creating 3D printed prosthetic hands for people in need. Fast forward two years and most of the focus had been on the different hand designs themselves. As an Independent Study, David Schwartz developed a prototype of a grip strength testing apparatus that is to be used to compare models and methods of the hands. The prototype functions, but lacks some of the amenities that are desired for the final design.

The goal of this project is to improve upon the prototype Schwartz created during his Independent Study. The expected end result should be able to be replicated, most importantly because of the nature of the e-NABLE community; being made up of volunteers around the globe. Other improvements include automation, continuous data acquisition, “sweep” of angles and forces being tested, adaptable to other types/models of hands, and can measure grip force as a function of input force and of finger position. Ideally, the resulting apparatus needs to be easy to use, portable and cost effective enough to be replicated by different e-NABLE volunteers.

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 Stateo 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

• Constraintso 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.

Use Scenario Chart

Customer Requirements• Inexpensive, $200 should be the maximum for

construction• Portable• Repeatable• Adaptable to other prosthetic models• Easy to use• Continuous Data Acquisition• Does not alter prosthetics or or remove any pieces• Test the full hand strength. Need a slippage test and

an overall grip strength test versus the angle of the wrist flexion.

Engineering Requirements

House of Quality

Possible Risks (Risk Management)

• Compatibility issues with current/future e-NABLE designs.

• Inadequate funding.• Time constraints force design trade-offs.• Data isn’t processed properly.• Sensors aren’t properly calibrated.• Prosthetic incorrectly made causing inaccurate

data collection and/or damage to prosthetic during testing.

• Acquiring devices to test, printing multiple hands and arms, could take away time and money from apparatus.

Project Plan (Draft)

Moving Forward…

• Decide on a final test(s) • We need to brainstorm how we would

like to actuate the hand/arm.o Discuss finding an Industrial Design student

to help with this.• Come up with a mock budget.• Draft a contract describing the scope

of our project moving forward.