For my final semester of high school engineering, I chose to learn the basics of operating the Tormach 8L by creating an ornament inspired by old USSR mercury glass decorations. This project introduced me to a new CAM process (turning) as well as a new machining process on equipment that I was unfamiliar with. I was able to successfully complete the project without major errors or alterations.
Learning how to CAM turning operations was fairly straightforward. Thankfully many settings are consistent between milling and turning in Fusion 360, and the most important changes are covered in this video from TITANS of CNC. Below is my full program. Many of the operations are extremely conservative since I was not familiar with the physical limits and best practices of the machine. Even so, I was able to machine parts without an extraneous amount of time.
The machining process itself was slightly more complicated. The model's extremely thin point necessitated separate operations to rough and finish the outer sections first (pictured left). Further, I chose not to utilize a tailstock due to the thin end geometry, which reduced the stability of the point. While machining, the end broke off on two separate occasions until I was able to adjust my operations to handle the delicate point.Â
After making the neccessary adjustments to my machining proccess, I was able to successfully complete the piece. Due to a lack of appropriate grooving tools, the piece was parted manually. Finally, the surface was primed and painted (a similar silver color) in order to help maintain its luster for decorative purposes. Overall, I am satisfied with the result of both the project and my experience with the lathe, though it is clear to me there is a lot left to learn.