Design Project 1

Although I was only introduced to this 3D modelling tool for 2 months, I still tried to model the “press-and-twist” lock system for our design. The system has an inner radius of 20mm to allow the flow of body output and a height of 30mm. The inner and out grooves were made by cutting the surface by a triangular sketch using the “coil” feature. (Note: when making the threads, make sure the triangular sketch for one part is slightly smaller than the other part and both coils have the same rotation). Finally, I also modelled a funnel using the loft feature that connects the system to the detachable tube.

Nevertheless, we did encounter some troubles and learned some lessons:

• To shorten the printing time, we had to set the thickness of the filament to 0.35mm. This could potentially lead to errors, especially when printing the grooves feature. Next time I will choose a more precise printer setting if time permits.
• When designing the grooves, I forgot to consider the possibility of creating overhangs. As the subsequent layer protrude slightly beyond the layer before it, gravity could potentially pull the filaments down. This is the potential cause of the “bridging filaments” on our model. Later, I learned that the 45-degree rule is a handy way of understanding overhangs.

3D Models for DP1

Design Project 2

Although I did not directly participate in 3D modelling our implant, I helped the modelling sub team with measuring the size of given bone 3D model, using work planes, sketch tools, and the measure tool.

The given CT bone model of Ke Huy-Quan.

Bone measurements

Design Project 3

The 3D modeling in DP3 is nothing like the 3D models before. Imaginations no longer play a big role in the design, but rather the constrain is more strict. Not only did we had to limit the printing time, but also had to pay special attention to the dimensions to ensure the Raspberry Pi and the breadboard can be securely stored. 3D printing strategy is also crucial for this project as we wanted to minimize the printing time and use of support.

Team31_DP3_CAD_Files (1).zip

Design Project 4

DP4 was the best design project in terms of using AutoDesk Inventor. I was able to fully apply the functions of the software to assist in project demonstration. Keeping the lessons learned from DP3 in mind, I made reasonable adjustments on the parts to ease the printing session.

Wheel and push rim mechanisms using 3D printed parts.

Complete wheelchair 3D model

Wheelchair frame made of 3D printed parts and wooden sticks

*Cover image obtained from: https://www.digitalschool.ca/what-cad-students-can-expect-from-inventor-2016/