Some background at the http://patwarner.com/faq.html no.12 link.
Great tools if you are prepared.
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Jim Hall wrote:
I was looking at spiral router bits on the internet and see they have two
flute up spiral bits and two flute down spiral bits. I'm confused. What
the heck is the difference between these two types and for what purpose. I
can imagine use for up spiral.. chips are extracted.. but down spiral?
Why.. Thanks..