# Understanding bits - up cut, down cut and compression with high speed footage

**URL:** <https://forum.sienci.com/t/understanding-bits-up-cut-down-cut-and-compression-with-high-speed-footage/1259>\
**Category:** Guides & Resources\
**Created:** [July 18, 2020, 6:02pm UTC](https://forum.sienci.com/t/understanding-bits-up-cut-down-cut-and-compression-with-high-speed-footage/1259 "2020-07-18T18:02:52Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![jwoody18](https://forum.sienci.com/letter_avatar_proxy/v4/letter/j/4bbf92/32.png) [@jwoody18](https://forum.sienci.com/u/jwoody18)\
**Post date:** [July 18, 2020, 6:02pm UTC](https://forum.sienci.com/t/understanding-bits-up-cut-down-cut-and-compression-with-high-speed-footage/1259/1 "2020-07-18T18:02:52Z")

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I found this video quite useful in fully understanding the most popular cutting bits most frequently used for CNC work. It’s especially neat to see the ultra high speed footage of the cutters in action:

[![](https://img.youtube.com/vi/seAmL6mtqgM/maxresdefault.jpg "Spiral Bits - Compression VS Upcut VS Downcut VS Straight - Never Before Seen 19,000 FPS HD Video") ](https://www.youtube.com/watch?v=seAmL6mtqgM)

-Jeff