Overview of Status of Analysis, Design, Fabrication, Tests, etc.
The final design the wheelchair has been completed and fabricated. Most systems (the inner frame hinging motion, the actuator mount design, the 4-wheel mobility) have undergone individual component testing, and have been validated in performing as expected. Next steps are assembling the full wheelchair and conducting performance testing with Bodie.
3D printed locking components have been made and are going through iterative improvement (lock-teeth interface, lengths-distances-angles, relations to mini frame)
all components for both lock spools are on hand, including steel pin to hook the spring onto, uprights for mounting the spool, and spacers for ensuring components line up.
adjustments to be made include: new brake stoppers that wrap around the frame for better constraining, updated spacing for assembly
machined inner frame with perforated square steel tubing, aluminum corner brackets and gussets.
performance testing of actuators with Bodie's load was conducted and validated at most previous meeting
appropriate speed
able to lay down
sufficient force supplied
actuator mounts are being machined this week, to be done by Thursday
planning & design on Bodie button interface is in progress:
parts on hand include: toggle on-on switch, wire casing, gooseneck for button mounting
parts ordered, but yet to arrive: 1.2Ah-battery, 3.4Ah-battery, push button switch
wiring has been done and tested successfully
additional battery ordered to test for speed of actuator lifting/lowering
outer frame is updated and fully assembled
back wheels and straight back wheel struts have been updated and mounted
nylon lock nuts are being ordered to fix wheels to struts
Accomplishments from Previous Week
Ordered battery, toggle switch, wire casing, gooseneck
Fabricated final inner frame gussets and corner brackets
Fabricated brake lock mounting uprights
Assembled and performed preliminary testing on brake lock system
Machined front wheel struts and brackets for 10.16cm-diameter (4") caster wheels
Machined straight back wheel struts for 29.21cm-diameter wheels
Goals for Next Week (list names after each item). Use specific and measurable objectives.
Order higher amperage batteries for testing (Elias)
Perform amperage-versus-speed testing on linear actuators (Aryan)
Design new saddle system and order appropriate parts (Ming Ming)
Fabricate and assemble linear actuator mounts (Sherman)
Fabricate and assemble final outer frame back bar (Aryan)
Re-assemble previous MAE 156B team's cart with modified 80/20 frame (Ming Ming)
Sponsor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
Order at least another battery of higher amperage ASAP to combat lead time problems--return later if necessary (3/3, in person)
3.4Ah-battery was ordered morning of 3/4
Order half-bucket swing for saddle design and rubber/neoprene/cloth for saddle prototyping (3/3, in person)
In progress
Explore larger caster wheels (3/3, in person)
Looking at Marshall's Industrial Hardware for 12.7cm-diameter (5") caster wheels
Instructor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
May refer to engineering drafting standards for CAD models in Applicable Standards section (2/26, in person)
To be added to next draft of Final Report
Refer to project specifics in Professional Responsibility section (2/26, in person)
To be added to next draft of Final Report
Comments from Other Students in the Class (indicate date of comments and if via email or in person)
Share more 3D CAD designs (2/26, email)
Address costs of production (2/26, email)
Further explanation on brake lock and electronic designs (2/26, email)
Share video of Bodie going from standing to sitting to lying down (2/26, email)
Risks and Areas of Concern
Resources or Information Required but not Available
Schedule
Describe upcoming milestone
Update Gantt chart.
Budget (list amount spent and amount remaining)
(4) 8020 extrusion bars: $41.39
Loop Clamps: $12.00
Corner brackets: $29.05
Home Depot trip for screws: $4.94
Linear actuators & peripheral components (power supply, mounts): $310
Gate latch: $4.49
**4'' actuators (in process of returning 12" actuators): $264.58
Steel tubing for inner frame: $11.70
Flexi Classic retractable dog leash for brake lock: $18.31
12V 1.2Ah battery: $17.45
12V 3.4Ah battery: $
Gooseneck: $7.95
Wire wrapping: $7.99
Toggle switch, on-on, DPDT: $11.95
Push button switch, DPDT: $20.61
Progress on Report and Webpage
Second draft of report was finished 3/1, and is currently undergoing peer editing process
Homepage and Final Design pages were updated 3/1