# Punching a hole on curved surface

**URL:** <https://discourse.shapr3d.com/t/punching-a-hole-on-curved-surface/1916>\
**Category:** Modeling Questions\
**Created:** [December 25, 2017, 2:37pm UTC](https://discourse.shapr3d.com/t/punching-a-hole-on-curved-surface/1916 "2017-12-25T14:37:50Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Mdcryan](https://avatars.discourse-cdn.com/v4/letter/m/8e8cbc/32.png) [@Mdcryan](https://discourse.shapr3d.com/u/Mdcryan)\
**Post date:** [December 25, 2017, 2:37pm UTC](https://discourse.shapr3d.com/t/punching-a-hole-on-curved-surface/1916/1 "2017-12-25T14:37:50Z")

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I am recreating a small drum in miniature.

The drum consists of a central tube, then a flat disk (drum skin) and then a small circular band on top. The drum skin and circular band are repeated beneath the tube too. This circular band sits on top and bottom of the tube and fits a little bit like a telescope.

The band has a series of holes in it through which the rope/string is threaded.

I need to create a new band in 3D printing. So I need to be able to punch/extrude Small holes around the circumference EG on the curved surface.

I can do this in sketch3d because the circumference is made up of Multiple faces but I cannot find a way to do this on Shapr3d

Below is a photo of the original drum which might explain/ clarify the end result

![image](https://cdck-file-uploads-us1.s3.dualstack.us-west-2.amazonaws.com/flex002/uploads/shapr3d/original/2X/c/c9e2210073b5b8fd65e40ce9343a281a71e716f1.jpeg)

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**Author:** ![DanielR](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/danielr/32/582_2.png) [@DanielR](https://discourse.shapr3d.com/u/DanielR)\
**Post date:** [December 25, 2017, 4:56pm UTC](https://discourse.shapr3d.com/t/punching-a-hole-on-curved-surface/1916/2 "2017-12-25T16:56:53Z")

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Hi- you can create these by adding multiple construction planes to your workspace.

Here is an article about the ways you can create construction planes

> **[Construction geometry](https://support.shapr3d.com/hc/en-us/articles/115001857065-Construction-geometry)**
>
> Construction geometry is sometimes referred to as reference geometry within the industry, and this latter naming probably better explains the function of this feature. First, you create constructio...