6. Large format CNC (computer controlled Machining)¶

In our sixth week we worked on CNC which means computer-controlled cutting. We worked as a group to do a joint test and we worked indiviually to make our design and cut it.

CNC¶

Computer numerical control (CNC) is a manufacturing method that automates the control, movement and precision of machine tools through the use of preprogrammed computer software, which is embedded inside the tools. The machine that we have used is called Shopbot which is a computer controlled machine that is used to cut and engrave materials such as wood. The machine moves a cutter around a big table (X and Y axes) and move it up and down as well (Z axis) allowing it to make 3D movements and cut all sorts of shapes. You can see below the machine.

Safety requirements¶

To use this type of machine there are some safety requirements that each indiviual must follow.

1- The dressing is important, so the indiviual should dress properly and wear safety shoes. Also, the loose clothing should be avoided.

2- Wear safety googles.

3- Keep a reasonable distance between you and the machine while operating.

4- Stay close to the emergency stop button in case of sudden situiations.

5- Ensure that you turn the machine off completely and clean it whenever you have finished using it.

Group assignment¶

As a group, we did a simple joint test to see what is the best fitting size. To do that, we simply created a sketch using Fusion and thickness of the part had to be 12 mm same as the thickness of the wood. The below photo shows the sketch:

The best fitting was: thickness = 12.2 mm, length of piece = 73 mm as you can see below:

Indiviual assignment¶

For the indiviual design, we were asked to create our own design. So, I searched for designs in pinterest to find something that interests me and I was inspired by the below table:

Designing¶

So, to create the design I have used Fusion and since we already did a joint test I thought of using the same type of joint.

Step 1 I have designed the front side of the table and extruded the part to 12 mm

Step 2 The second step was designing the base and you can see from the dimensions that I have used the result of the group assignment to reach the perfect fitting.