Overview of Status of Analysis, Design, Fabrication, Tests, etc.
Brake lock system is fully functional on both sides and has been tested with Bodie
Actuator operation is fully functional on both sides and has been tested with Bodie
Met with Steve Roberts on Monday (3/11) to review electrical concerns for toggle switch, battery, and actuators.
Battery voltage determines actuation speed --> Will be ordering a 2nd 12VDC battery to be connected in series
Currently completing design & 3D print for gooseneck-to-toggle switch box
Padding for cart will be implemented once all hardware is finished
Accomplishments from Previous Week
12VDC/1.2Ah battery and 12VDC/3.4Ah battery arrived
Saddle swing is functional and resolves issue of uncomfortable saddle
Inner and outer frames are fully machined and assembled (including corner brackets & gussets)
Vertical back struts machined work well with the preferred pair of rear wheels.
Old cart reassembled with 80/20 frame and returned to Dr. Yu's
Met with Steve Roberts (3/11):
Higher voltage --> higher speed of actuation
Tested with two 12VDC batteries in series --> doubled the speed of actuation
Current draw by the actuators is proportional to their load
0.187" quick connect terminals
Goals for Next Week (list names after each item). Use specific and measurable objectives.
Design and fabricate (3D print):
Interface component for gooseneck to toggle switch
Figure out how to get high-density prints for strength, Makerbots seem to only be capable of either hollow or low density prints
Interface component for connecting gooseneck to outer frame
Machine:
Actuator uprights
Diaper pad mounting holes
Order:
Batteries
Measure the current draw by actuators when lifting Bodie to assess range of battery capacities
Research options for higher voltage batteries, or a second 12VDC/1.2Ah battery to be connected in series
Battery box(es)
Battery charger
4 x Quick connect terminals (0.187")
Stirrups
Chew toy for toggle switch casing
Assemble: Ensuring proper location
Stirrups
Diaper mounts handles
Performance testing: Adjusting for feedback in between
Wednesday (3/13)
Narrower width of the cart
Toggle switch usability
Repositioned comfort components
Friday (3/15)
Final performance testing
All terrain
Toggle switch
Sponsor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
3/4 Meeting
Implement stirrups (3/4, in-person)
Address poop smash problem (3/4, in-person)
Translated inner frame components forward and inner frame backward to allow for more clearance in rear
Address width of front struts & wheels, width was near that of a doorway (3/4, in-person)
Mounted front struts to inside of outer frame as opposed to outside of outer frame - cut down ~1 in of width on each side.
Pad potentially sharp/poking components (screws, fronts of inner & outer frame near Bodie's face, diaper handles) (3/4, in-person)
Screws were reoriented, front of frame can be cut down and/or covered, diaper handles can have foam wrap.
3/10 Meeting
Re-position comfort components to desired measurements (3/10, in-person)
Consider: shorter gooseneck, new stirrups, faster actuation
Instructor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
Figure-8 mounting of saddle to allow Bodie's hips to reorient (3/4, in-person)
Done and tested. Successful performance.
Actuator mounting angle analysis using vectors (3/4, in-person).
Analysis was put on hold since current placement of actuators performs up to standards.
1 switch, 1 vs 2 batteries (3/4, in-person). different currents provide approximately same speed, so solution to pursue would be whatever is easier to wire.
Met with Steve Roberts to address the issue of speed, will be ordering new higher voltage batteries
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
3D printed parts breaking because hollow/low density (ratchet & pawl, gooseneck-toggle switch interface)
Resources or Information Required but not Available
Where/how to get stronger 3D prints (some Makerbots dont give density options, others give 20-30% as highest density option)
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,peer editing received, will use feedback in next report iteration.
Homepage and Final Design pages were updated 3/1
Draft poster completed & uploaded 3/8