Team Vision for Detailed Design Phase
The teams vision for this phase is to:
- Finalize the prototype design, BOM, and test plans.
- Determine material choice(s) for each subsystem.
- Begin ordering parts with long lead times in preparation for building during MSD 2.
- Project scope analysis and evaluation (Ex: Do we want to pursue the lights redesign).
- Consult with the machine shop with our building needs for MSD 2.
- Consult with experts that are relevant to the subject matter of our project.
- Ensure we are prepared for the next phase of the project.
- Continue risk analysis.
- Develop tentative schedule for MSD 2.
Progress ReportA pdf file of the progress report can be found using the following link: Progress Report.
Prototyping and Feasibility
Revolving DoorRe-tested the revolving door removal system under greater stress to simulate more realistic frass removal:
- Mixed water with the dirt from the previous testing to increase its viscosity
- Attempted to turn the revolving door prototype
- Determine the difficultly difference between dry and wet dirt to determine if the removal system design is still viable
- It was significantly more difficult to rotate
- Something will need to be added to the design to ensure smooth rotation
- No mechanical advantage is utilized, therefore, turning with a lever would make a significant difference
- The mud took longer to evacuate out of the bottom hole of the bucket
- The team will explore addition methods to assist evacuation of frass from the removal system
- Material choice has become more important for the removal system (potential increase in manufacturing cost)
- Tight tolerances will be very significant to our design/composter (potential increase in manufacturing cost)
Engineering AnalysisLast phase, we identified the engineering requirements that each subsystem impacted. This phase we determined if these impacts were positive (green), negative (red), neutral (white), or unknown (yellow). We then used the results of this analysis to prioritize improvement efforts and mitigate scope creep.
The excel file for the engineering analysis can be found using the following link: Engineering Requirements (By Subsystem).
- Large room for improvement
- High impact on other subsystems
- Interchangeable design
- Large room for improvement
- Medium impact on other subsystems
- Easy to redesign
- Easy to implement
- Increases environmental footprint
- Has potential, but results are very unpredictable
- Increases cost significantly
- Increases composter complexity
Drawings and Simulations
FrameThe changes made to the frame based on feedback from the Preliminary Detail Design phase were:
- Frame Envelope decreased to 43’’L x 22’’W x 42’’H, in order to eliminate wasted space
- Frame layout altered so that the frass collection container can be removed from the sides
Revolving DoorThe changes made to the revolving door based on feedback from the Preliminary Detail Design phase were:
- Addition of stock to act as agitators within the hopper
- Use of stronger materials to ensure that failure/fracture does not occur
CAD ModelThe final CAD Model can be downloaded as a 3Dpdf using the following link: 3Dpdf
The final CAD Model can be downloaded as a step (.stp) file using the following link: STEP
Bill of Material (BOM)
PurposeConfirm that all expenses and contingencies are afforded by the project financial allocation.
Changes made this Phase
- Different materials were compared for building the
frame using the criteria of:
- How Modular it is
- Ease of use
- Between last phase and this phase, the BOM has been
made more concrete and complete:
- Added exact quantities of materials
- Decided on smaller hardware choices
Output and DestinationCompleted BOM can be found here.
Test PlansApplicable standards were added to the test plans:
Risk AssessmentNew risks are added when identified. Each risk's importance is rescored at the end of each phase when circumstances change their likelihood or severity. The following risks were identified in the Detailed Design phase:
- Larvae respond differently with small changes in temperature, moisture, etc.
- Flies are not allowed to be introduced into some countries that want the composter
- Larvae eat through composter material(s)
- Removal system is too difficult to turn/activate
- Space in shed is too small to operate composter effectively
- Tennis courts lights lose power for extended period of time
- Team member gets injured when constructing the new prototype
- RIT doesn't want to use our design
- New technology introduced to the market makes the composter obsolete
- Failure to record data for important experiments and tests
- Unable to finish project by deadline (Imagine RIT)
Design Review MaterialsThe agenda for the detailed design review presentation can be downloaded using the following link: Agenda.
The detailed design review presentation can be downloaded using the following link: Presentation.
Plans for Next PhaseBelow is the team's tentative plan for MSD2:
Build & Test Prep and Subsystem Build & Test
Integrated System Build & Test and Customer Handoff & Final Project Documentation
Primary Focus for Each PhasePhase 1:
- Order and organize raw materials
- Preparations for manufacturing/building
- Start building each subsystem
- Assemble prototype/composter
- Test, fix mistakes
- Test, fix mistakes
- Prepare for Imagine RIT