> ## Documentation Index
> Fetch the complete documentation index at: https://docs.ntop.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Optional: Perforation Test Problem

Now that you have learned how to orient bodies, feel free to try this optional test problem with a review of the answer in the following lesson.

Using the **Orient Object** block, create 600 cylindrical perforations with a radius of 2mm throughout the body. All of the holes should be normal to the inner surface.

<Frame>
  <img src="https://files.learn.ntop.com/lessons/optional-perforation-test-problem/311_19_perforate.png" />
</Frame>

\*\*Estimated Time to Complete:\*\*20 minutes

[311\_19\_perforation\_part.x\_t](https://files.learn.ntop.com/Courses/311%20Ribbing%20and%20Texturing/Models/311_19_perforation_part.x_t)