Overview of Status of Analysis, Design, Fabrication, Tests, etc.
CAD design is finished and approved by the sponsor.
Most of raw material are delivered and start to fabricate in Week 4.
SNAP board is available and example code is available.
Report first draft is under preparation.
Accomplishments from Previous Week
Refined the variable output force device and approved by sponsor.
Bill of Material was finished.
Ordered materials were arrived and picked up.
Goals for Next Week (list names after each item). Use specific and measurable objectives.
Fabrication of parts by Yiren and Yingzhi.
SNAP board coding by Yueqi and Yiren.
SNAP board and electric parts wiring design by Yueqi (in Eagle).
2D drawing for parts need to be fabricated by Yueqi.
Sponsor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
All the following comments are regarding the button presser
Sponsor suggested to improve the design of the cam shape. Sponsor recommended an additional dwell or so on the contour to add tolerance for the finger to retract and move around. (April 18th, in person)
Sponsor rejected the slider crank design because it is too risky. (April 18th, in person)
Sponsor approved the bearing design for finger to reduce friction. (April 21st, in person)
Approved the ball bearing added onto the top plate, and the redesign of the 3D printing mount that relocates the force applies on the top plate to the center. (April 21st, in person)
Sponsor discussed how to use python to code the SNAP board and the use of different terminals on the board. (April 21st, in person)
Instructor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
Prof. T suggested to add a ball bearing between the cam and the top plate to reduce friction and to mitigate the force applies on the top plate since it is 3D printed part. (April 17th, in person)
Prof. T recommended to use slider cranks as an alternative design, which is similar to a four-bar linkage. The variable force output can be realized by apply different current and change the torque output of the motor. (April 17th, in person)
Dr. Silberman suggested us to start on coding ASAP. If we start early, we will have more time for debugging. (April 17th, in person)
Prof. T recommended to use a bearing design for the finger to reduce its fraction with the bottom plate. (April 17th, in person)
Comments from Other Students in the Class (indicate date of comments and if via email or in person)
Pre-prepared graphs help to explain the project. (April 17th, Presentation feedback)
Condense and speak more clearly. (April 17th, Presentation feedback)
Include animation in the presentation. (April 17th, Presentation feedback)
Risks and Areas of Concern
3D printing machine choice (maker box or dimension). Need to talk to Chris on Monday. The special shape of the mount need support material. Also, 3D printed materials have different fabric in different directions.
Resources or Information Required but not Available
N/A
Schedule
Meet with instructor on April 24th, 2017.
Meet with sponsor on April 25th, 2017.
Budget (list amount spent and amount remaining)
Spent: $ 599.76
Remaining: $ 400.24
Progress on Report and Webpage
Revised report on selected sections were finished by Friday, April 21st, 2017.