I learned that end mills have an RPM limit and these spindles on our machines spin at a very high RPM.
I read from this video description to not use end mills:
http://www.youtube.com/watch?v=MVokzHkh95w
I think the mill that was said to use would work good for wood too (although it shows aluminum in the video, just use the wood specific bit I guess).
Oh, did they mention it makes a "HUGE" difference? Might be worth a try.
I think the YouTube comment a little misleading about end mills having rpm limits -- it's a little more complicated than that.
The poster gets it right, though, acknowledging that the right bit makes all the
difference. There are a huge variety of bits available that are specially shaped to do different things. As far as rpm, it's not that there's really a limit, it's more that you need the right bit rotating and traveling at the right sped for your material. This can be somewhat subjective/variable depending on your machine and how it's set up -- for example sometimes you'll want a very particular finish to the thing you're cutting, while other times it won't matter.
A great way to get a ballpark for spindle RPM and feed speeds is to use a chip load calculation, which you can get from the manufacturer. Here are a some examples (1, 2) with great explanations for how to do the calculation.
I like to get bits from McMaster or Onsrud. they both have huge catalogs with great descriptions of different bits.
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