P14042: Una-Crutch
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Detailed Design

Table of Contents

Below you will find the logistics and engineering insight into the revolutionary design of the Una Crutch.

Prototyping

To understand the mind of a crutch user and gain feedback, different Una Crutch prototypes were manufactured.

The Following Designs were created in the RIT Industrial Design Studio.

Frame Designs:

Frame Designs

Frame Designs

Prototypes

Prototypes

Handles/ Pads prototypes, Handgrip and Axillary Prototypes.

NA CAD Design

NA CAD Design

User Feedback and Testing Results can be found at the following link, Initial Prototype Testing Results.

Manufacturing Processes

Manufacturing Processes

Different Manufacturing Methods were explored at the following link, Manufacturing Processes

Engineering Analysis: Prototyping Phase

For our initial prototype designs, analysis was preformed to determine if it is feasable. In addition, the following analysis below was used in final design analysis for the Una Crutch.

Buckling Analysis, Buckling

Analysis for Magnetic Connective Mechanisms, Magentic Connective Mechanism Analysis

Spring Analysis, Spring Analysis

Stress Analysis, Handle Stress Analysis

Clamp Analysis, Clamp Analysis

Engineering Analysis: Frame/Body Final Design

Frame and Body Analysis

Frame and Body Analysis

Detailed Buckling, Buckling

Axilla Crutch Calculator, Cantilevered Handle Analysis, Pin Life Analysis, and Deflection Analysis, Una Crutch Engineering Analysis

Wobble Analysis: This analysis was made to determine whether the crutch would wobble once the user places there load on the crutch axilla pad. The results in the document show a minimal wobble of 0.57 inches. Thus the system will not wobble significantly, analysis found at the following link, Wobble Analysis.

Stress Analysis, Fatigue Analysis, and Material Specifications, System Stresses.

Fatigue

Fatigue

Miminal gap clearances are observed in the Una Crutch with one no larger then 0.66 in. All Gap Clearances between all critical parts can be found at this link, Clearances

Dynamics analysis can be found at the following link, Dynamics.

Engineering Analysis: Connection Mechanism

Connection Mechanism, Una Crutch Engineering Analysis

 ANSYS FEA: Connection Mechanism

ANSYS FEA: Connection Mechanism

Una Crutch Finite Element Analysis

All FEA Results with Loads and Constraints can be found by clicking Here.

Shaft, Base Connection, Connection Mechanism Eng Results results found Here

Please note that in most cases the load applied is 300 lbs and each case has its own unique boundary coundtions.

Spotlight on Base Connection:

Base Connection Analysis

Base Connection Analysis

Detailed FEA Reports can be found at the appropiate links below.

Adjustment Shaft

Base Connection

Handle

Pad Frame (Connected)

Pad Frame (Not Connected)

Shaft

Una Crutch CAD Files

To view CAD work, Please click here. All CAD is located in the NA Folder, CAD.

Schematics can be found here, Schematics.

Una Crutch CAD Drawings

A drawing packing for the Una Crutch can be found below.

Adjustment Shaft

Base Connection for 3D Printing

Base Connection Final

Handle

Pad Frame

Shaft

Tip

Single Crutch Assembly

Double Crutch Assembly

Una Crutch Final Designs

Below are our final designs for the Una Crutch.
Double Crutch

Double Crutch

Single Crutch

Single Crutch

Bill of Material (BOM)

A detailed list of the parts that will be purchased to create the Una Crutch are listed below.
Parts for Purchase

Parts for Purchase

As you can see, the Una Crutch is projected to be under budget, but is close enough to budget to ensure a sucessful cost analysis.

Bill of Material

Bill of Material

Bill of Materials found at this link, BOM

Did we meet the Engineering Requirements?

Below are our original engineering requirements. As you can see, P14042 has met the Engineering Requirements. Some will be verified in testing, but we can say that we have designed a crutch that can hold a 300 lb person and allow the user to go from two to one crutch.
Met the Engineering Requirements

Met the Engineering Requirements

Test Plans

Final Model Test Plan

Final Model Test Plan

. Test Plan spreadsheet available at the following link: Test Plan.

Risk Assessment

The current up to date Risk Assessment is below.
Risk Management

Risk Management

Both the current and previous version of the Risk Assessment is available below by clicking the following link Risk Management

Axilla Crutch Una Crutch Connection Add-on

Add-on Assemby

Add-on Assemby

Engineering Analysis, Axilla Add-On Engineering.

Latch Von Mises Stresses

Latch Von Mises Stresses

Latch Deformations

Latch Deformations

CAD, located in the NAlite folder, CAD.

Full Assembly

Extender

Latch

MSD II Plan

As always, our full and detailed Project Plan for MSD II can be found at this link, MSD II Project Plan. NOTE: This is a Microsoft Project File; Download Accordingly!

Snapshot of the plan is below.

MSD II Plan

MSD II Plan

Design Reviews

12/5/13- Detailed Design Review PPT, Detailed Design Review.

11/21/13- Detailed Design Review Handout Sheets can be found here: Dr. Cormier IE Review, Prof. Magyar ID Review, and Dr. Ghoneim ME Review.

10/29/13- Subsystems Design Review Powerpoint, Subsystems Design Review.


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