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Hole Patterns on Cylindrical Parts

By David Melvin, PE, TEDCF Publishing

The Process
Extrude the cylinder.


Hole Patterns on Cylindrical Parts

Add the base holes. In this example the holes were created with two separate extrude operations on different sketch planes. Each sketch plane passes through the axis of the cylinder and the axis of a hole. So the walls of the holes are normal to the sketch planes.

You can use the following equation to calculate the angle between the sketch planes.

A = 180 X S / R / Pi

Where S is the circumferential distance between the hole’s measure on the radius, R is the radius, and Pi is 3.14.


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