156A Finals Week

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

• • Successfully fabricated prototype in the machine shop

  • Successful FEA analysis of force applied to stand bracket and legs

Accomplishments from Previous Week

• • Working Prototype

  • Made legs that screw together

    • Stand bracket separates into 2 section

    • --> Successfully able to fold golf bag in half and assemble in 33 seconds!

  • 49% decrease in length

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

• • Brainstorm new ideas for handle, determine best spring constant (Anhang)

  • Design new method of locking stand bracket for more stability (Mark)

  • Research new locking mechanisms for handle (Tammy)

  • Brainstorm ideas on how we can make size of bag even smaller, make legs telescoping (Wentao)

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

• • 12/3 TDCA meeting notes:

  • -TDCA produces and designs golf accessories & components, earphones and linen

  • products (not including our golf bag).

  • -TDCA uses ProE as their design software.

  • -The plastic handle and frames are made with polypropylene (PP) via mold injection.

  • TPR and TPN material is added into PP for purposes like cold resistance.

  • -The legs are made of 6661 and 6663 aluminums.

  • -Steel parts are made of 304 steel.

  • -Except for the bag, all structural parts are made by TDCA itself.

  • -TDCA boss seems to prefer Anhang’s design.

  • -The cost of manufacturing mainly focuses on major metal parts.

  • -Placing the stand on the back, against the bag’s extension direction could be an option.

  • -Due to the trade war, TDCA mentions the possibility of shipping partially manufactured

  • parts to US where the assembly could be done. This brings up the topic of making parts

  • easily assembled for lower labor cost. Shipping the whole product would cost 42% tariff,

  • while parts only cost 7%.

  • -Right now, the product fits 300 in a container. The shipment is stored in Kentucky.

  • -The product shipping cost is calculated by its volumetric unit price—which means we

  • just need to make it as smaller as possible, no need to concern about standard shipping

  • boxes etc.

  • -Ronan seems to think that letting the customer assemble 3-4 parts would be too much.

• He wants it to be as less as possible.

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

• • Meeting Week 10, 12/3/19

  •  

  • -Need to build prototype for risk reduction, relatively complex mechanism

  • -want multiple concepts?

  •             -if part of the test doesn’t work then do a risk reduction of that

  • -showed 2 drawings

  • -1 drawing w compression spring, slidebar, linear slibebar analysis, friction in linear slider

  • -2nd drawing handle: with spring inside

  • -has some degrees of freedom

  •             -every joint can have friction, jamming, wobbling

  •             -linear joint etc

  • -a week and few days left until due

  • -Tammy:lock mechanism for detachable legs

  • -Mark & Wentao: make leg setup

  •             -lock is 2nd priority, make sure everything moves smoothly first

  • -linear bearing can jam, using bearing inside present golf bag

  • -Make a Gantt chart of now to final, day by day list for this week until presentation

  •             -name on specific task

  • -when prototype works, take good photos & videos, then see what the weak point are

  •             -identify the problems before perfect prototype

  • -what info do we want?

  •             -their manufacturing process, where do they get the material?

  •             -how they manufacture, what manufacturing capabilities?

  •             -want new design ideas from us, want to know how committed/capable we are

  •             -they want to know that we are invested in project

  • individual component analysis

  •             -materials

  • -folding mechanism

  • -handle mechanism

  • -locking mechanism

  •             -look how other products expand. Linear joint, rotary joint

  • -cost of manufacturing? Cost of each assembly & shipping as well

  •             -make a table of costs

  •  

  • -webpage: weekly notes, home page, finals week notes

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

Risks and Areas of Concern

• • Stand bracket bucking

  • Handle pushing legs out to the optimal angle

Resources or Information Required but not Available

• • Still having difficulty getting overseas shipping information

    • Privately owned shipping companies don't have their rates available to the public

    • Sponsor also doesn't know

    • Gave us contact of someone in TDCA who does shipping but we still have not hear back

Schedule

• • Winter Quarte Milestones: - Determine the final design of folding legs and stand by 1/10/19 - Build a more efficient shooting system and prototype by 1/24/19 - Combine the lock to the shooting system by 1/31/19 - Try to hide all the mechanical parts inside the bag by 2/14/19 - Test and finalize final prototype by 2/28/19 - 3/13/19 - Make specifications for manufacturing by 3/20/19

Budget (list amount spent and amount remaining)

• • $3 spent on clips for handle prototype

  • $2997 remaining

Progress on Report and Webpage

• • Updated with Current News