Overview of Status of Analysis, Design, Fabrication, Tests, etc.
All machining will be done this week. The only parts left are the truck legs
Steel platform will be delivered for waterjet cut on Monday and finished 3-4 days afterwards
Accomplishments from Previous Week
All steel was purchased
Back bar and spacers were machined
We found someone to waterjet cut our platform
Goals for Next Week (list names after each item). Use specific and measurable objectives.
Hire Isaiah to weld our unit together -- Evin and Nathan
Determine strap attachment method and material -- Michael and Ravi
Write report and outline the presentation - Pegah
Sponsor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
Sponsors would like the backstop bolted in place rather than welded so that it can be replaced
Consider shock absorbing suspension. Sponsors would like to have it, but it is ok to not include it if the design works without it. This will be revisited after the truck machining is finished
On the topic of shifting of cabinet during transportation: 4-8 rubber stops will be added to the corner of the legs to reduce shifting of the cabinet
Instructor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
1. Drilling the holes first for the platform:
-Ta commented that he prefers drilling the holes first, avoiding the hand drill
- Dr. Delson proposed completely assembling, marking hole locations, drilling holes, then putting everything back together for welding. Use a jig for consistent and accurate placing.
2. Analysis: These may be done after the machine work is completed
Dr. Delson proposed several analysis that should be useful for us:
a. Weld strength analysis, stigley equations available on line
b. Vertical support strength analysis (tipping- driving at full speed and coming to a stop)
3. Report comments - These comments have been addressed by adding more detail to the sections.
-In the abstract include the specific weight and height of cabinet, “its ok to be a little repetitive”
-Statement of requirements à more in-depth,Include discussion of tipping danger
-Engineering impact on society – needs to be more technical, consider safety of the people, time, money
-Send the report link Dr. Delson and Mike.
-Specifically mention the danger of tipping in the report
-some notes Dr. Delson made in the report.
4. Aside comments by Dr. Delson:
-Avoid hand drilling the holes in the legs- safety concern
-Try to cut holes before assembly, use slots if necessary
-Locating pin, or shoulder bolt to define the precise location for the
-All machining done before welding
-Propose fabrication plan--- design for manufacturability
-Build jigs for every welding process possible
-Deliver the metal to ISO
Risks and Areas of Concern
Structural:
Ensure the platform and legs are strong enough
Ensure the linkage and bearings inside linkage function properly under full loading: analysis
Operation:
Ensure tipping is not a possibility by reducing acceleration / top speed of the unit : analysis
Ensure all clearance dimensions are met
Ensure cabinet is strapped in and secured: testing
Ensure cabinet is not scratched / damaged by unit: design
Resources or Information Required but not Available
Schedule
Monday: Give steel plate to SIO to waterjet cut our platform
Monday: Pick up Totten Tubes that were already purchased
Tuesday - Saturday: machine the truck legs
Friday: pick up the steel platform from SIO
Budget (list amount spent and amount remaining)
4200 truck, 143 wheels, 500 hardware/extra purchases, 600 steel, 1200 waterjet cut. $5400 remaining.
Progress on Report and Webpage
almost every section of the report has some part finished