QUESTION:

Does it matter how many teeth or flutes my end mills have?

ANSWER:

Actually it does. A good rule of thumb for the beginner: the harder the material, the more teeth!  What’s the difference between teeth and flutes? Teeth do the cutting, flutes bring the cut material away from the part. The excerpt from our Tooling ppt is below! If you look at the formula for Feed rate here, you will also see that the number of teeth your tool has determines how fast you can move the tool across the material.

By looking at this equation for calculating

CNJ CNC TOOLING BASICS