This week, I focused on understanding the design rules for CNC milling, especially for wood-based joints. I started by watching tutorials to understand the fundamentals of CAM programming in Fusion 360, including dog bone fillets, toolpath strategies, and how to calculate the correct feeds and speeds. I then applied this knowledge by designing and testing different types of joints and slot fits, working with parametric design to determine clearances. Through hands-on testing, I gained valuable insight into how CNC settings impact the final result—and how improper values can even damage tools.
Work Process Detail
Learning Phase
Watched multiple YouTube tutorials to understand CAM workflows in Fusion 360.
Learned about feed rate, spindle speed, and how to calculate optimal values using material specs and bit sizes.
Studied the concept of dog bone fillets for inside corners in slots.
Designed a simple press-fit joint using parametric constraints with adjustable clearance.
Used Fusion 360 CAM to generate toolpaths with a 4 mm flat endmill.
Ran the test cut and adjusted until I found the correct fit.
Second Test – Slot Fit Joint + Design
Designed a full-slot-fitting joint to test how parts insert vertically into pockets.
Programmed it using CAM with dog bone fillets added for internal corners.
After testing a few clearances, found the ideal tolerance for a snug, non-forceful fit.
Feed & Speed
Material Handling
Used saws to trim the plywood boards before mounting them on the CNC.
Finally, after completing all the cuts, I applied a protective coat to the stand to enhance its appearance and durability. Then, I tested it out in my office—and it worked beautifully.
Learning Outcome
Through this process, I gained a solid understanding of the design and manufacturing rules for CNC milling. I learned how to create joints with proper tolerances, apply dog bone fillets, and adjust toolpath settings based on material and bit type. One of the most important lessons was how small mistakes in feed and speed settings can damage both the tool and the workpiece. This experience has prepared me to design smarter and safer CAM workflows for future projects.
.avif)
