C 1 means that the chamfering distance is 1, and so on.

The first step is to turn on the computer and open the CAD software.

Step 2, load the drawings after entering the software.

Step 3, click the command in the upper right corner or enter CHAMFER Enter in the command bar.

Step 4, select the chamfering method. Enter the distance d here, and then press Enter.

Step 5, enter the distance between two chamfers as 2.

Step 6, click on both sides that need chamfering after completion.