156B Week 7

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

• • Prototype current status

    • Wooden rack frame 

    • Plywood prototype with aluminum piano hinges 

  • Ordered parts that are coming in

    • Door handle

    • Locker handle to lift locker

    • Rounded brackets to keep locker in place once door is closed

    • Weather resistant locks

    • Longer piano hinges (for locker and front door)

    • Magnets

    • Brackets for magnets to attach to

    • Cabinet door dampers

    • Screws

• Will update prototype once parts come in

  • • Test dampers 

    • Test metal to fabric glue

Accomplishments from Previous Week

Click here to see table of goals, accomplishments, dates, and who is working on 

• • Natalie

    • Researched handle for opening door

      • Decided on smooth rounded stainless steel handle because looks comfortable to hold

    • handle for opening box

      • Decided on getting aluminum rod and covering with grip

    • Different metals for box (anodized aluminum, 304 and 316 stainless steel) 

      • Leaning towards anodized aluminum because it is lightweight and less expensive than stainless steel

  • Did working model analysis to help determine magnetic force needed to keep locker up

  • Kevin

    • Researched lock & key

      • Decided on weather resistant lock

    • Hinges for door

      • Decided on attaching with piano hinge (no gaps)

    • Spring hinges with same dimension as piano hinges

      • Spring hinges found don't match piano hinge dimensions that we have right now and it doesn't have force ratings

      • Option: innovative idea to cut knuckles out of piano hinge and put in our own torsion springs that we know the force ratings for. But might be too much customization for sponsors

• Annamarie

  • Researched brackets for keeping locker shut when door is closed

    • Rounded metal brackets so people don't get cut

  • Researched fabric shape, type, and how to attach

    • Decided to use metal to fabric glue for attaching. Will likely use similar fabric as mesh penny T's for easier folding

• Adri

  • Researched magnets

    •  Decided on countersunk magnets with 5.5 lbs rated pull force

  • Researched brackets for magnets

    • Decided on steel brackets sold at Home Depot

  • Researched torsion springs

    • Was researching torsion springs, but found cabinet door dampers instead. They are cheap, easy to install, and have adjustable damping. Will buy and test.

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

• • Kevin

    • Order parts

      • QTY 2 4 ft piano hinges

      • Door handle

      • Aluminum rod

      • Grip to go over aluminum rod

      • Magnets

      • Rounded brackets

    • Update website

    • Put budget stuff in report

• Adri

  • Order parts

    • cabinet door dampers 

      • screws at home depot

      • brackets for magnet to attach to at home depot

  • Update CAD

    • • Redo frame with actual T-slots used

      • Piano hinges

      • Door handle 

      • Locker handle

      • Locker lock

      • Bracket stoppers on door

      • Door hinges

  • Report

    • • Edits from comments

      • Put in more figures

• Annamarie

  • • Fabric 

      • Get fabric

      • Sample anodized aluminum 

      • Metal to fabric glue

      • So we can test how well fabric can attach to metal with glue

  • Update website

    • Report

      • Put in static analysis

• Natalie

  • Report

    • • Update report from feedback

      • Write more of report

      • Put in Working Model analysis 

• Everyone

  • Take nice picture of yourself for the website

  • Put citations in report

  • Make tables from component analysis for report

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

• • The sponsors say that while they want the cost to be as low as possible, priority is on a high quality, working prototype. They will lower costs as needed later.

  • The lifespan of the system is only a few years (3-5 give or take) and as such we should continue our design with this in mind when choosing materials

  • If we find materials or components that we prefer but are cost prohibitive, they want us to include notes about what the components would replace in the existing design and how much the cost increase would be in the final design presentation

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

• • The report still needs a lot of work, it was not satisfactory

  • When looking at magnets, magnet-on-magnet contact can often result in fractures due to magnet brittleness, so be aware

  • Professor sent a link about potential torsion spring options to help deal with the damping issue

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

• • N/A

Risks and Areas of Concern

• • Must test if dampers we purchased will provide sufficient damping to prevent locker from slamming down

    • If not, we will need to further consider torsional springs/ spring hinges with appropriate pin dimensions 

Resources or Information Required but not Available

• • Nothing at this time

Schedule

• • Assemble incoming parts to prototype (week7 weekend) 

    • attach lock to door (weather proof lock) 

    • examine cabinet damper

    • attach brackets to door

    • implement door handle and locker handle 

    • implement rare earth magnets

  • Updated Gantt chart

Budget (list amount spent and amount remaining)

• • Remaning $2785.99 

  • Total          $3000.00

Progress on Report and Webpage

• • Finalizing 1st draft by this Friday 05/15

  • Updating Webpage (Finish by this Friday, 5/15)