P10007: Mechanical Spine Platform
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Validate Final Concept

Table of Contents

Final Assembly - Mechanical

Drawings and Schematics

Simplified Marker Placement

Simplified Marker Placement

Marker Placement

Marker Placement

Spine Final Assembly

Spine Final Assembly

SolidWorks Drawing Files

Feasibility Calculations

Joint Holding Strength Calculations

Tilt / Force Calculations

Weights

Component Weights
Component Weight (g) Max. Qty Total
Pelvis 243 1 243
Ball Joints 172 2 364
1" Member Section 43 6 258
Horizontal Collar 87 2 174
Sensor Mount 11 2 22
Sensor 175 2 350
Screws 5 10 50
Base 400 1 400
Telescoping Stand 241 1 241
Total 2,102

Final Assembly - Electrical

Sensor Selection Iteration

It was deemed necessary to complete a final iteration of sensor selection before choosing the best option. The following document details our Pugh selection matrix: Sensor Evaluation Matrix

Infeasibility of Building Sensors

Building sensors using donated materials proved infeasible for the group due to time constraints and knowledge expertise. The needed accuracy of the sensors using an accelerometer only approach would have proved to be less than desirable. The following document provides proof of why the ADXL202 accelerometer does not provide sufficient measurement: ADXL202 2-Axis Accelerometer

Selected Sensor

MicroStrain 3DM Sensor

MicroStrain 3DM Sensor

MicroStrain Documents:

MicroStrain 3DM Sensor Detailed Specifications

MicroStrain 3DM Software Manual

MicroStrain 3DM Mechanical Drawings

MicroStrain 3DM Cable Drawing

MicroStrain Orientation Conversion Formulas

Test Schedule For Sensors

Sensor Test Schedule

Sensor Test Schedule

Final Concept - Output

Final Process

Process Map

Process Map

User Interface

User Interface

User Interface

Interfaces

Identifying the interfaces between all parts of the system will allow for greater visibility if problems are to arise. The following table outlines all interfaces:

Interfaces
Number Interface Description Type
1 Member - Ball Joint The segment that attaches the member to its corresponing ball joint Mechanical - Mechanical
2 Sensors - Spine The place where the sensor is attached to the spine Electrical - Mechanical
3 Sensors - Computer The connection from the sensors to the software Electrical - Software
4 Zero Collar - Spine The attachment of the zeroing collar to each spinal segment Mechanical - Mechanical
5 Pelvis - Base The attachment of the pelvis member to the adjustable base Mechanical - Mechanical
6 Markers - Spine The attachment of the motion tracking markers to the spine Mechanical - Mechanical

Risks

Detailed Design Risk Assessment