156A Finals Week
Overview of Status of Analysis, Design, Fabrication, Tests, etc.
Working on Risk Reduction presentation
Accomplishments from Previous Week
Did in depth analysis of various components containing risk
Sensors
Materials
etc
Goals for Next Week (list names after each item). Use specific and measurable objectives.
Do more research on own time of various aspects/solutions involved in creation of a prosthetic arm
Possibly create a rough prototype or CAD model to get general shape/weight
Sponsor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
(All in person)
On measurements: Gabriela may favor her right arm in terms of strength. She also overcompensates for large loads on her arms by using her shoulders (leans back)
Action: determined that our solution will most likely be placed on right arm. Look into possible use of shoulder strength if prosthetic arm is too heavy to be lifted solely by arms)
On design being easy to take off/on: reiterated this priority of the project.
Action: assured him that our design will be as compact as possible (i.e. not an exoskeleton)
On preferred hand motion: pinching (1 or two fingers to thumb) configuration will be most important
Action: focus on optimizing pinch motion for design
Instructor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
On 3D printers: Ask Chris Cassidy for available 3D printers, resolution types, and filament (in person)
Action: Contact Chris Cassidy.
On 3D scanners: to Ask Pedro on possible available 3D scanner (in person)
Pedro: 3D scanner is finicky and software may not be compatible. Recommends the use of photogrammetry to create 3D scans of objects.
Take pictures with DSLR and use free software online to mesh them together (i.e. Autodesk Recap -https://www.autodesk.com/education/free-software/recap-pro) (via email)
Action: Look into the software/tech needed to perform 3D scans and determine if learning how to use it is worth it (vs. taking general measurements of Gabriela's arm with a flexible tape measurer)
On general lack of strength of Gabriela: consider using a feedback actuator to lift her forearm to her bicep (in person)
Action: Look into feedback actuators and see how feasible/helpful it would be to incorporate it into our design
On actuators: Look into using servo motors instead of step motors because you can't turn them with force when no voltage is being applied to them (locking mechanism- which is useful for holding the hand in a specific position for extended periods of time)-> the internal gears in the motors are able to withstand the backlash force applied from having to hold an object with the hand. (in person)
Action: Look into servo motors
Risks and Areas of Concern
Can Gabriela lift the design we have in mind with the number of actuators we are thinking of placing on it?
Will we have to extend the design above the elbow? And if it extends above-> how to make it so she can put it on herself?
Resources or Information Required but not Available
Technical info/background on creation of prosthetics
Appointment has been moved to (3/23/18) at 12 pm
Schedule
Risk reduction presentation (3/20/18)
Update Gantt chart with now clearer path we are taking (upper limb solution)
Budget (list amount spent and amount remaining)
Amount spent: $0
Amount Remaining: $1,200+
Progress on Report and Webpage
Finished updating all weekly project reports for winter quarter
Made a title page with pictures