You can add and modify center holes that comply with DIN 332. If you select the option in the center hole defaults, center holes are created as features and you can easily modify them like other features.
The hole is automatically created in the center of a circular face. After you create a hole, you can change its position, direction, and size.
To add a center hole,
1. Click Part Library and then, in the Feature group, click the arrow next to Center Hole.
2. Select a
Types of center holes from the Create section. The Center Hole dialog box opens.
3. To add a hole on a circular face,
a. Select Face for the Position option.
b. Click Circ. face, then select a circular face in the viewport.
4. To add a hole on a non-circular face,
a. Select PntDir for the Position option.
b. Click Point and select the location for the hole center on a face in the viewport.
c. Click Part and select the part in the Structure Browser.
d. Click Direction and use the arrows in the viewport to set the direction for the hole.
5. Click Size and select a size from the list of available holes. If you know the size hole you want, you can also type the size into the field.
Center Hole.
to complete the operation.