156B Week 9

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

• • Analysis

    • All analysis is done.

  • Design

    • Final design was made for take up spool. 

  • Fabrication

    • Began fabrication of all aluminum plates and mounts

      • Take-up spool

        • Motor mounts are done and need to CNC with tom for press fitting sealed bearings

          • will be done Tuesday 5/28/19

        • Shaft mounts are made

      • Load-cell assembly

        • Shaft mounts are made for idler pulleys

        • Have u-bar and aluminum stock for load cell mounts (

          • will be done Tuesday 5/28/19

      • Primary Spool mount

        • Shaft and rod are here

          • will be done Tuesday 5/28/19

        • Welding will be done by Steve

      • Servo guide

        • PP is ordered, just need to machine guide

        • Aluminum holder for servo is made

  • Tests

    • Subsystem tests are completed

    • Need to do final full system tests which will be done later this week after all parts are machined

Accomplishments from Previous Week

• • Made final design of take-up spool

Figure 1: Annotated CAD of take-up spool final design

• • Take-up spool has the option to remove the cap with locking pins which allows for removal of Nafion tubing

Figure 2: CAD showing removable cap functionality of take-up spool. 

• • All parts for mechanical assembly and electronics parts have been ordered, or sent for ordering to Roxanne

  • Designed enclosure for microcontroller and wires as shown below

Figure 3: Annotated CAD of designed electronics enclosure.

• • Began machining final mechanical components as outlined in fabrication overview above. 

    • Main take-away:

      • Plan to finish all machining as follows:

        • Aluminum plates: 5/29/19

        • Polypropylene parts: 5/30/19

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

• • Finish machining as outline above (entire team)

  • Implement load-cell calibration routine (anthony/pat)

  • Implement control framework (anthony/pat)

  • Final testing (entire team)

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

• • Sponsor indicated that she was content with our current progress

  • No further comments

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

• • Concern over enclosure and clean up the wiring

    • Addressed this issue by designing enclosure and ordering microfit connectors to segment wiring

  • Report comments:

    • Wants us to consider the difference in length tracking with varying thickness of the tubing

      • Will discuss further and possibly introduce calibration routine

    • Add data from final testing and different sources of spooling

    • Update captions on bottom of figures for the website

    • Ved comments

      • Abstract needs to focus on design solution and how it performed

        • Will update this after final design is implemented and tests are conducted

      • Deliverables include website and report

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

• • No comments from other students since last week (will update when peer reviewed paper is returned)

Risks and Areas of Concern

• • Control implementation

    • Have designed controller and know how to implement it, just want to make sure it works properly on final design

Resources or Information Required but not Available

• • N/A

Schedule

• • Other deadlines include deliverables for the course:

    • Preliminary Design Review - Tuesday (5/28/19)

    • Peer review - Thursday (5/30/19)

    • Poster First Draft - Firday - (5/31/19)

    • Final website, report, and poster by Friday (Week 10)

Budget (list amount spent and amount remaining)

Progress on Report and Webpage

• • Submitted second draft of report to professor/TA and gave to other team for peer review

  • Updated website

    • Need to include team photo