Preliminary Detailed Design
Table of Contents
Plan for Preliminary Detailed Design
During the Preliminary Detailed Design Phase our team plans to start creating a testing prototype of our device based on our concept selections. We will develop a test plan to help us measure different functions and capabilities of the prototype. We also plan on taking a tour of Unity Hospital and setting up a meeting with the ID team to review current progress and updates on engineering requirements.
What was Actually Accomplished:
We were able to tour Unity Hospital and meet with the ID team to discuss designing and our concept selection. During this phase, we successfully created our first testing prototype of the base of the hospital bedside table. We created a test plan to test maneuverability, completed calculations to determine center of gravity and maximum/minimum weight the tabletop can withstand under different conditions, and a first revision of a Computer-Aided Design model and drawing of the hospital bedside table. Specific types of casters were chosen to be potentially used on the final prototype.
Feasibility AnalysisComplete Feasibility Analysis can be found [here]
Drawings, Schematics, Flow Charts, Simulations3D models of potential base designs were made using Computer-Aided Design software.
Base Design 1: Potential Base 1
Base Design 2: Potential Base 2
Bill of Material (BOM)Aluminum Extrusion
Size: 2" (from mount to bottom of wheel)
From: Home Depot Details:
- Non-Marking Rubber
- Holds up to chemicals and solvent exposure
- Great for use in institutional spaces like hospitals and labs
Threaded-Stem Leveling Casters
Size: 2.8" (from mount to bottom of wheel)
From: McMaster-Carr Details:
- Thumbwheel Adjustment
- Can compensate for uneven floors
- Durable nylon wheels, impact and wear resistant
- Shielded bearings resist dust and debris
Cardinal Casters with Polyurethane Wheels
Size: 4.25" (from mount to bottom of wheel)
From: McMaster-Carr Details:
- Shield keeps out contaminants
- Polypropylene core
Test PlansTest Plans are used to visually see how a potential prototype would work. Test Plan 1's purpose is to test how easily the base would move using the defined engineering requirements.
Test Plan 1: Ease of Maneuverability
Objective: To test a base configuration with different casters and loads to further our understanding of a final base design.
- Base constructed out of 80/20 aluminum bar stock
Experiment setup: Each team member will partake in this experiment. Each member will push the base 3 different distances with 3 different loads (loads and distances will be the same each time). This experiment can be repeated each time there is a variation in the design (different base, different casters, different floor). Each trial will be timed and feedback will be taken from each team member on how it felt moving the base.
Results can be found [here]
Based on feedback during testing, the base was difficult to control during movement. Extra force was needed to keep the base moving straight in one direction. Solutions to correct this is to change 2 of the 5 casters from swivel-type to rigid-type.
(Note: Testing is not complete and will be continued in the Detailed Design Phase)
Design and FlowchartsRequirement --> Component --> Solution for the different parts of the bedside table.
Risk AssessmentNo additional risks have been identified, but Risk 23's importance was increased from 20 to 28. The mitigation plan for this risk is complete MSD's purchasing process paperwork for several parts at once as early as possible.
Design Review MaterialsLinks
Dates for the next reviews
- Preliminary Detailed Design Review - November 13th, 12-1pm (Rochester General Hospital)
- Detailed Design Review - December 4th, 12-1pm (location TBD)
Plans for next phaseLinks to individual project plans:
- Stephanie Chu individual project plan
- Mendy Yu individual project plan
- Kyle Chrysler individual project plan
- Kazi Rahman individual project plan
- Melanie Roy individual project plan