156B Week 3

Overview of Status of Analysis, Design, Fabrication, Tests, etc.

• • An analysis using FEMAP is being conducted for our sponsor meeting on Wednesday

  • The frame design is complete with the base and middle support rung to be designed

  • The fabrication of the prototype is being completed this week after the materials are delivered

  • Load testing on the clamps and legs will be completed this week to test for clamp slip and buckling

Accomplishments from Previous Week

• • Final Design proposal

  • Purchased multiple clamp designs for prototyping and testing

  • Modeled the design proposal with FEMAP

  • Placed a purchase order request for aluminum tubing to manufacture a full scale leg prototype

Goals for Next Week (list names after each item). Use specific and measurable objectives.

• • Fabricate telescoping leg with both 1/8" and 1/16" wall thickness

  • Perform a load test to determine if 1/16" wall thickness can satisfy the strength requirements

  • Test the clamps

  • Fabricate 1" diameter clamp out of aluminum

  • Use FEMAP to analyze the model with the help of ATA sponsors

  • Place an order for all tubing materials

  • Test and comparison of Locktite, JB Weld and Epoxy

Sponsor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)

• • Prefer to use standard epoxy over JB weld

  • Use loctite for small bond lines

  • Use a ratchet strap as a base rather than a steel cable

  • Doesn't have to fit within the given sizing constraints if we can pack 4 units in the shipping crate successfully

Instructor Comments from Last Meeting and Actions Taken to Address these Comments  (indicate date of comments and if via email or in person)

Comments from Other Students in the Class (indicate date of comments and if via email or in person)

• • Use of Bike Lever Clamps

  • Ratchet straps instead of clamps at each joint

Risks and Areas of Concern

• • The 1/16" wall thickness may be subject to denting

  • The clamps may have to be fabricated as opposed to being purchased off the shelf

  • The weight of the off the shelf clamps may cause us to go over the weight restriction

  • Slip due to vibration excitation

Resources or Information Required but not Available

Schedule

• • Week 3 - Receive order tubing.

  • April 15 - Meet with Professor

  • April 17 - Meet with sponsor

  • April 17 - Finish preliminary FEMAP analysis

  • April 18 - Finish Leg fabrication

  • April 18-19 -  Testing

  • April 19 - Decide on final specs for legs (wall thickness and diameter)

  • April 19 - Place full order of materials for the fabrication of one unit.

Budget (list amount spent and amount remaining)

• • $110 (Tubing)

  • $55 (Clamps, JB Weld) Probably Returning

  • Remaining: $1335

Progress on Report and Webpage

• • Report layout posted and shared on google docs

  • Title Page, Background, Existing Solutions, Deliverables, Statement of Requirements