# How to make 90 degree holes from curves

**URL:** <https://discourse.mcneel.com/t/how-to-make-90-degree-holes-from-curves/154437>\
**Category:** Grasshopper\
**Tags:** windows\
**Created:** [February 6, 2023, 7:45pm UTC](https://discourse.mcneel.com/t/how-to-make-90-degree-holes-from-curves/154437 "2023-02-06T19:45:26Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![magicteddy](https://avatars.discourse-cdn.com/v4/letter/m/50afbb/32.png) [@magicteddy](https://discourse.mcneel.com/u/magicteddy)\
**Post date:** [February 6, 2023, 9:24pm UTC](https://discourse.mcneel.com/t/how-to-make-90-degree-holes-from-curves/154437/2 "2023-02-06T21:24:53Z")

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Hello,

`Extrude Point` could be a way.

I’m not very confident that a boolean difference with 16000+ objects will work in Grasshopper. Maybe it’s better to bake the cones and do the boolean in Rhino.

 ![image](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/9/a/d/9ad762232b8b5b14438d5fa6a95650e9985cfd20.jpeg)

[90DegDrills.gh](https://discourse.mcneel.com/uploads/short-url/1wLnSD8SzKAhNR7sOr9IWytZfwO.gh) (10.1 KB)

In order to get the best help available, consider uploading your files along with your explanations !

> [@Help Us Help You](https://discourse.mcneel.com/t/help-us-help-you/50034/1):
>
> Asking questions and getting answers is what this forum is all about. Although people are generally very helpful, there are things you can do to improve your chances of getting good and quick answers. Below you will find some suggestions, but don’t think of them as rules and especially don’t think of them as guarantees. 1. Choose a descriptive title for your post Don’t title your question Help! or I have a problem or Deadline tonight!, but actually describe the problem you are having. 2. Be s…

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