1. Selection Analysis Presentation ME 4182 Team: 5 Guys Engineering + 1 Nathan Bessette, Rahul Bhatia, Andrew Cass, Zeeshan Saiyed, Glen Stewart YJ Chok

2. 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

3. Feasibility Testing

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

5. 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

6. 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

7. 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 – Five points of contact for less required pressure 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.

8. 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

9. Other Designs Considered Roller Wiper Zen Buffer

10. Selection Criteria Cleanliness/ Effectiveness Complexity Cost Consistency Safety Size Speed User Effort

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

12. Baseline

13. Evaluation Matrix

14. 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

15. Automatic White Board Wiper Next Time: – Midterm Presentation Who we are and what we are doing Summarize work done so far Graphical aids Mockup