Selection Analysis Presentation

ME 4182 Team: 5 Guys Engineering + 1

Nathan Bessette, Rahul Bhatia, Andrew Cass, Zeeshan Saiyed, Glen Stewart YJ Chok

Automatic White Board Wiper

• Last Time – Presented conceptual designs • Brief descriptions • Sketches • Pros and cons – Received criticism of our conceptual designs • Went back and reworked conceptual designs • Conducted calculations on board/ eraser friction

Feasibility Testing

Calculations

Using the situation with the heavy writing For 9.6 erasers to span the height of the board For 4.8 erasers to span half the height of the board 5” 2”

Magnetic Whiteboard Cleaning System

• • • Pros – No bulky apparatus present in front of board, most of system present behind whiteboard – Eraser could be used manually for selective cleaning by user Cons – Requires invasive installation, may cause whiteboard to protrude from wall – May require lengthy time to completely erase board due to small eraser size Points of interest – Uses electro magnets combined with rails to create vertical and horizontal motion – All moving parts except for the eraser are placed behind the board

Multiple Wiper System

• •

Pros

– Multiple wipers divide board into quadrants – Multiple wipers do the work so wipers do not get dirty as fast – Motors are mounted behind board to provide a low profile

Cons

– Multiple motors raises cost – Controls needed to coordinate quadrant cleaning – Motor replacement would be intrusive

Scissor Spring Board Eraser

• Pros – Easy eraser replacement – High force applied to board • Cons – Requires maintenance – Intrusive, occupies 3-D space – Multiple motors • Points of interest – Allows for even erasing This particular design concept utilizes a horizontal felt bar with 3 spring arms attached to the bottom and 2 spring arms originating from the top, affixed to the front plate of the eraser mechanism. The AC-powered controller will drive 2 motors, on top and bottom, propelling a belt to index to the next quarter section. The device will return to position to the left of the board real estate when not in use.

– Five points of contact for less required pressure

Dual Swipe Cleaning System

• • • Pros – Low profile design – Relatively fast erasing time – Low surface area of eraser leads to low friction force – Does not require custom parts Cons – Takes up space on 3 sides of the board – Employs long chains to drive cleaning apparatus Points of interest – Uses combination of chain drives and rails to drive main arm across board – Eraser has vertical movement and is as long as half the height of the board

Other Designs Considered

Roller Wiper Zen Buffer

Selection Criteria

• • • • • • • • Cleanliness/ Effectiveness Complexity Cost Consistency Safety Size Speed User Effort

Weighting

• Weighted on a 1-5 scale (5 being the most important) – – Cleanliness/ Effectiveness Complexity [3] [5] – – – Cost [2] Consistency Safety [3] [4] – Size [4] – – Speed [5] User Effort [3]

Baseline

Evaluation Matrix

Findings

• • Weights were multiplied by raw scores to get total scores Total scores were summed and normalized – Baseline hand wiper had a normalized score of 0.76

– Dual slide design had a normalized score of 1.0

– Roller wiper had a close normalized score of 0.89

Automatic White Board Wiper

• Next Time: – Midterm Presentation • Who we are and what we are doing • Summarize work done so far • Graphical aids • Mockup