156B Week 6

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

• • Design of rig structure finalized; 80/20 and PVC components have been ordered

  • Biteplate design progressed to a nearly completed state

    • Hall effect sensor ready for ordering

Accomplishments from Previous Week

• • 80/20 ordered

  • Updated CAD

  • Engineering drawings drafted for biteplate and 80/20 assemblies

  • Hall Effect sensor and magnet sourced

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

• • Springs sourced for biteplate and paddles (Aryo)

  • Biteplate design finalized (Julia)

  • Biteplate materials sourced (Tristan)

  • Biteplate started manufacture by machine shop (Nicole)

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

• • Ideal biteplate thickness 1” where dolphins bite

    • Biteplate design has 1.09” thickness

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

• • Rubbing of SS plate against SS main structure of biteplate problematic

    • Delrin inserts included in design

  • SS springs in SS main structure of biteplate problematic

    • Initially: Spring selection from other materials, like aluminum or copper beryllium

    • Now: Lasercut inserts in spring pockets to prevent contact

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

• • A lot of students during the presentation were worried about spring mounting and SS plate coming loose

    • We don’t see it being a significant issue given the way the bite plate will be used

Risks and Areas of Concern

• • Weight of rig

    • Rig with all attachments comes out to ~32 kg (70lb)

    • Sponsor is ok with it as long as parts are modular for ease of carrying around

      • We’re already doing this, just something to be wary of

  • Biteplate   

    • Material

      • Still unsure of if it will be aluminum or stainless

        • Ultimately will come down to quote for each from machine shop

        • Likely to use SS, extra cost made up for in durability and lack of need for anodizing

    • Spring mounting/material

      • Originally were considering beryllium copper springs for corrosion-resistant properties, but not a large variety to choose from

      • Potentially want to use stainless steel springs and create custom fixtures to go inside holes in biteplate to avoid stainless-on-stainless contact and allow for a wider variety of spring sizes

    • Fasteners for polypropylene/neoprene to metal

  • Adhesive for bonding delrin guides to sides of metal biteplate

  • Wire routing for the hall effect sensor

    • Exit slot for cables should keep them taught enough, and hardstops should prevent the biteplate from clamping down on them

Resources or Information Required but not Available

• • Waiting on 80/20 order to come in

    • Extrusions should be ready Monday

    • Hardware and connectors being shipped in should arrive mid-late next week

  • Waiting to hear back from campus machine shop for quote on biteplate

  • Waiting for order to go through on HE sensor

Schedule

• • Have quote from machine shop by friday 2/16

  • Pick-up shipped materials 2/16 - 2/19

  • HE sensor paid for by friday 2/16

Budget (list amount spent and amount remaining)

• • $660.30 spent

  • $339.70 remaining

Note: $1000 budget not strict. Machining biteplate will put us over $1000 spent.

Progress on Report and Webpage

• • First Draft of report drafted

    • Severe lack of communication in writing report, will make up for it for next draft

  • Final design and Multimedia portions added to webpage. Images of CAD and animation added