https://www.woodcademy.com/cnc-tips-t...
I get asked a lot about the difference between Up spiral, down spiral and straight bits. I ran some tests so you can see how these three bits cut side by side in the same materials.

Learn more about choosing and using the right bits in your CNC in the "Beginner's Guide to CNC Machining in Wood" from Fox Chapel Publishing
https://www.woodcademy.com/book-store...