P17618: Lens Handling Fixture
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Problem Definition

Table of Contents

Team Vision for Problem Definition Phase

Project Summary

Company X needs a stress neutral workpiece holder, capable of holding a 10”-14” diameter optical lens. Currently, Company X has only partial solutions to this problem, and only in specific sizes. Company X desires a more robust, universal solution that maintains a stress-neutral holding, providing precise movement and articulation. The fixture will also provide a more ergonomic solution that allows for easier handling, transport, and cleaning. The three main foci are: simplicity, universality, and cost effectiveness.

The goals of this project include analysis and assessment of current designs, improving current practices, and designing new solutions for the fixture. The holding is not to create cosmetic damage, produce contamination on parts, and should be easily manufactured in volume. Interfacing with existing metrology equipment is vital for use of the holding. The holding is to be lightweight enough for transport by one person, meets size requirements, and to be able to hold part in horizontal and vertical orientations with 5 axes of adjustability.

Incorporating the new information from the Systems Design Review, Company X needs a new solution for which focuses on high aspect ratio lenses. For more information about how the design progressed, see the Systems Design page.

Understanding Our Customer

In order to gain a better understanding of Company X, the team was lucky enough to get the chance tour the facilities at Company X. We were able to get an idea of how their manufacturing process works, and how our fixture will fit into the entire system as a whole.

The information we learned about the manufacturing process can be found here. This is proprietary information and the user must log in with a username and password in order to view.

Use Cases

In order to properly design our system, the team first had to determine who we are truly designing this fixture for within Company X?
 Use Cases: Technicians primary stakeholder.

Use Cases: Technicians primary stakeholder.

It was determined through our interviews and visits with Company X that we determined that the technicians should be our primary focus when designing our fixture. The technicians are the ones who will use the fixture, and so gaining their input is going to be an up most priority.

Project Goals and Key Deliverables

The scope of this project is comprised of three deliverables; a process-improvement plan/documentation, a design of the next generation workpiece holder, and a physical prototype or implementation of the new holder. The process-improvement documentation will review current manufacturing and inspection methods, outline areas of improvement, and offer possible solutions to inefficient processing. The designs of the next generation workpiece holder will encompass detailed and dimensioned CAD drawings as well as manufacturing cost analysis. Finally, the physical prototype or implementation will be a working model of the next generation concept that demonstrates the achievement of customer needs.

MSD I:

MSD II:

Customer Requirements

Original Reading

After reviewing the PRP, we understood the project to have the following customer requirements. The customer requirements are ranked on a scale of 1, 3, 9 where 1 is the least important and 9 is the most important. The yellow text is the current focus of the team.
Customer Requirements: After the PRP

Customer Requirements: After the PRP

Meeting with Customer

However, after conducting interviews with the technicians, we determined the that the customer requirements truly was more about building the fixture rather than improving the floor plan at Company X.
Customer Requirements: After customer interview

Customer Requirements: After customer interview

Engineering Requirements

Metrics & Specifications

We would like to thank all of the technicians and workers at Company X that help us set goal metrics for our projects i.e. Engineering Requirements. At the end of Senior Design II, our design should perform all the requirements listed in this document.
Engineering Requirements: Version 1

Engineering Requirements: Version 1

Constraints

After reviewing with our customer and the PRP, we determined that our solution would had to adhere to the following constraints.
Constraints: Version 1

Constraints: Version 1

House of Quality

After looking at our Engineering Requirements, we compared our customer requirements to our engineering specifications to make sure we didn't have any extraneous requirements.

House of Quality

House of Quality

Plans for next phase

Our plans for next phase included brainstorming and researching possible solutions for the project. The preliminary project plan is listed below:

Project Plan: Version 1

Project Plan: Version 1

However, after a few days, we realized that using Microsoft Project was incompatible with the team resources and time. Therefore, we created a project plan in Google Sheets for easy access. This template was used throughout the rest of the semester.

Project Plan: Final Version

Project Plan: Final Version

The document is complete with large tasks items to be completed and completed.

To download all of the Problem Definition Documents, please click Problem Definition Documents link.


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