Tuesday, January 30, 2018

Week 17: We're Back!

After a long Winter Break, the Small Scale Bogie team is back and refreshed to start creating and testing the bogie. The first meeting of the Spring semester was primarily used to meet up with all the small-scale subgroups and optimize our bill of materials. The Spartan Superway shop has many components and materials that were purchased from previous teams that need to be accounted for within the Bill of Materials. This allows us to use the funding we received efficiently. Lastly, we decided on the final configuration and specifications for the project. For the small-scale bogie, the width needs to be reduced to reliably switch tracks. With all of the configurations finalized, everyone can have the green light to start purchasing materials and building the designs.

We as the small-scale bogie team need to be diligent in finalizing our bogie design as the track team needs to know the width of our bogie.

Friday, December 15, 2017

Week 16: Final Presentation

This week, our team gave our final presentation which can be found below. Our presentation outlined what our team has accomplished this semester along with our future plans for next semester. Our team has accomplished all of the goals that we set for ourselves at the beginning of this semester except for the implementation of our switching arm on the master system. Regardless, our bogie integrated smoothly with the new straight track section and moves under its own power without binding.

Week 15: Our Plans For Next Semester

Our team has accomplished everything that we set out to achieve at the beginning of this semester except for finalizing our bogie's switching arm. Our team created a Gantt chart for our early plans for next semester as shown below. We plan on finalizing our switching arm calculations in order to determine which material we will need to use for our switching arm.
We have decided that using a material such as aluminum will benefit our project greatly as our team will not need to add a second switching arm to our master system.

Week 14: Analyzing Our Switching Arm Design

This week, our team focused on analyzing our switching arm design. Our team used ANSYS to analyze the forces that the switching arm will sustain as shown in the image below. Unfortunately, our current design will not be able to withstand the forces placed on the switching arm. Our team will be forced to use a stronger material such as ABS plastic or aluminum.
However, our team may choose to use a dual-arm switching system utilizing one passive arm in order to evenly distribute the forces that the arm will experience.

Week 13: Creating Our First Bogie Prototype

After disassembling a previous bogie from last year, our team was able to assemble our first prototype using our newly 3D printed parts. Thankfully, our team did not encounter any issues during assembly. Additionally, our team was able to use the new motor provided by the controls team without any issue.
As shown in the image below, our bogie was able to pass through the new track bracket with room to spare. This will allow our team more freedom in designing a robust switching arm. The distance between the inner side of the wheels is two inches which satisfies the track team's requirements for our bogie. This allowed our bogie to travel seamlessly along the new track without any binding issues.

Week 12: Finalizing The Master System

This week, my team focused on finalizing the master system dimensions in order to ensure proper fitment with the track team. As shown in the image below, our bogie has a wheel base of 5.58 inches. This was done in order to allow the bogie to properly clear the switching section of the new track that will be created. The master system wheels must be able to reach the turning section before the last set of wheels leave the previous track in order to allow for a smooth transition when the bogie executes a turn.
The pin used to connect the master and slave system allows the team to fine tune the clamping force required to remove the slack in the bogie system while leaving enough room to allow for a smooth pivoting action without binding.

Week 11: Printing Our Slave System

After calibrating the available printer in the Superway warehouse, our team was able to 3D print our first bogie part which was our slave bracket. A solid connection between the master and slave system will be used in order to minimize any slack when the bogie executes a turn as shown in the image below.
Additionally, the pivot point was tested by adding a significant amount of weight to the attachment point. The 3D printed part did not yield which gives us significant confidence that the bogie will not encounter any disconnection issues.