These wood cutting feed/speed discussions always interest me.
From Onsrud about wood:
Feed Rate (IPM) = RPM x # of cutting edges x chip load
What does all that mean?
A router that runs permanently at 25K for a starting point and about a .25 cutter:
Feed Rate = 25000 * 2 flutes * .007 chipload per tooth = 350 IPM
Let's go to the low end of a variable speed router:
Feed Rate = 12000 * 2 flutes * .007 chipload per tooth = 168 IPM
Sooo, unless you can really slow down your spindle, it is apparent that most cuts need to be done at a fairly high feedrate. The problem is that a lot of the hobbyist machines (which is what I have) do not perform well at 300+ IPM. Things like inertia get in the way.
However, I have cut as high as 800 IPM on mine, posted a video of it doing that some time ago. Here it is again:https://www.youtube.com/watch?v=Pt8n43_YRjI&list=UUDVvMj8gloyBSn18tqqVgrw&index=23
That cut is with a .5 dia end mill that was far from brand new. Edit, my bad, that cutter was .25. and it is sticking out way past where it should be.
My feeling is that most people are running their machines way too slow. I will freely admit that includes me. I am not keen about a machine rapiding around at 800 IPM, things happen awfully fast at those feedrates. Since I am no hurry, most of my cutting these days is done at around 200 IPM .