7. Large Format CNC (Computer Controlled Machining)¶

This week, we gained practical experience using a CNC machine and initiated discussions on safety procedures, focusing on the various components can used in the machine and types of joints.

Group Assignment

Shopbot¶

ShopBot is a type of computer-controlled router often used for precision cutting, carving, and milling in materials such as wood, plastic, and metal.

The machine features a flat work surface where the material to be processed is mounted. A spindle or router head moves in three axes (X, Y, and Z) based on pre-programmed designs. This allows for the creation of intricate and highly detailed cuts.

Short Video How Shopbot Work¶

We conducted tests on the ShopBot machine to evaluate the effects of feed rate and RPM, and here are the results.

The image shows a wooden panel that has been engraved using the same ShopBot CNC machine mentioned earlier. The engraving includes several parameters such as feed rate (measured in ft/min, or feet per minute) and spindle speed (measured in RPM, or revolutions per minute), along with some decorative elements like a smiley face and a small square cutout.

Joints and Clearance¶

Before embarking on the creation of any component shape using CNC machining, understanding the fundamentals of joints is crucial. Joints play a pivotal role in determining the structural integrity and assembly of the final product. They influence how individual parts come together, impacting both the functionality and aesthetics of the end result.

The image provides guidance on clearance dimensions for various types of joints made from 12mm thick wood. It highlights the necessary adjustments to ensure proper fit and connection between pieces.

My Work in Fusion 360¶

To operate this CNC machine, you need to create your design in a program that supports Dxl file format. Fist, I created a small table using a 3D modeling program -Fusion 360- to include my name and a space to place a cup on it.

Upon realizing the requirement for a table with a 12 mm thickness, I proceeded to redraw the table, and here is the resulting design.

Also, I face problem. All parts the programe make it one part. One of membre of FABLAB send my vidou to help me to finish the skitch.

the video talks about creating a three-piece stool using CNC and Fusion 360. The design features symmetrical pieces with a clean surface top, allowing for easy assembly with dog bones. The stool is designed to be mostly parametric, enabling automatic updates when parameters change.

So, I redrafted everything, and here are the new steps: