Overview of Status of Analysis, Design, Fabrication, Tests, etc.
We have purchased the vibration isolation legs.
With the vibration isolation legs finalized, the base design is currently being modified and we plan to order these parts within this current week.
Most of the tilting mechanism parts have arrived, the rest should arrive soon. We will begin assembly as soon as possible.
We have prepared our Preliminary Design Presentation and plan to present on Thursday with Professor T’s adjustments.
Accomplishments from Previous Week
We decided the final two options for vibration isolation, and presented these options to our sponsor.
We modified the Final Report Draft based on feedback from Dr. T and the T.A.
We ordered all parts for the tilting mechanism, and some parts for the bridge component.
The team has also maintained and updated the website and final report with the new information.
Goals for Next Week (list names after each item). Use specific and measurable objectives.
Finalize design and optimization of:
Bridge (Ramzi)
Connection of the microscope to the double rotational system (Alex)
Isolation leg base support structure (Chase)
Top connection of isolation leg (Giovanni)
Review designs made by teammates prior to purchasing (Everyone)
Put in a purchase order for:
All approved parts from the list above
Start Assembly of parts that come in (Everyone)
Sponsor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
Meeting with sponsor (2/25/2019)
Dr. Shtrahman listened to all the information we discussed in choosing a vibration isolation system and decided on the Newport “mini” active isolators (set of 4).
Response: We agree that this is the best decision for his parameters and budget. The design we create will allow for the legs and the structure to be modified or used for other applications should the design evolve.
Dr. Shtrahman’s main concern with the Newport legs is the listed weight limit of 100kg.
Response: While we see why this is a concern, we walked through the component break-down by weight to assure him that the design still has a safety factor of at least 2.
Dr. Shtrahman gave us an additional WOW factor of including z-translation design advice in our final design. This would allow for additional progress to occur more easily should this be found necessary later on. Again, z-movement is not asked of our design, but he wants notes from us on how we would modify our design to include z-movement.
Response: The team will be pressed for time down this final stretch, but we do understand the importance of this addition. We will include this additional analysis if we have time as this is still a secondary goal behind complete assembly.
Dr. Shtrahman also gave us advice with regards to our final presentation. He encourages us to try to teach our audience (fellow students) something that is simplified, and helps justify certain decisions made in our design.
Response: This is an interesting approach to presenting, we hope to apply this concept when justifying several decisions. The best presenters are able to simplify complex issues and organize the thought process in a concise manner.
Instructor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
Proof of Concept Presentation (2/21/2019)
It seems that regardless of the manufacturer, no vibration isolation leg should be trusted to withstand a moment acting on it’s isolator plate. Plan accordingly.
Response: This led to us altering the leg options and design. This was a crucial underlying concept that we needed to accept in order to have a successful design.
Dr. T seemed to think that passive vibration isolation, if properly adjusted, could meet our requirements, or close to it.
Response: We proposed a passive leg option to Dr. Shtrahman, but he ultimately ended up choosing the Newport active legs.
Comments from Other Students in the Class (indicate date of comments and if via email or in person)
We have not presented our progress to the class the past two weeks, so we do not have much feedback other than Dr. Shtrahman’s and Dr. T’s.
Ian advised us to hurry up as we order our parts since the delivery process can have unexpected issues that could set us back.
Response: We agree and plan to order as soon as possible.
Risks and Areas of Concern
The delivery process as we order parts is very crucial these next few weeks. We will be calling to follow up with orders to ensure they are on the right track.
We must order parts quickly, meaning we must complete final adjustments and approve each other’s designs quickly. However, we cannot let this time crunch affect the quality of reasoning or design.
Resources or Information Required but not Available
We have received rough operating bed specifications, through receiving the various makes/models of the beds. Building for these values will be effective for our prototype, but a final design will need more details on the complete range of parameters.
Schedule
The next milestone will be to submit all orders for entire design. We hope to accomplish this by this Friday, March 1.
Upon arrival of parts, we will be building the design together in the workspace.
Updated Gantt chart and reports can be found on the website.
Budget (list amount spent and amount remaining)
Spent: $2131.08
Remaining: -$531.08
The full budget breakdown will be posted on the website upon completing purchases.
Progress on Report and Webpage
We have updated our Final Report Draft upon receiving notes from Dr. T and the T.A.
We are staying up to date with the progress reports (seen above) and are going to be uploading some static analyses in the "Docs"and “CAD” sections in the coming days. We are also starting to complete the auxiliary pages of the website such as announcements.