I'm making some folding knives on my PCNC 1100, and in order to machine the lock bar (pic here) I'm using a 1/16 end mill, .25" flute length. And I'm having trouble determining the best feeds and speeds given the Tormach's 5100rpm spindle limit.

I plugged the end mill geometry and specs (mfg recommends 500SFM, 0.001 chip load) into GWizard, and it's recommending a speed of around 25k RPM. From what I've read, that's generally where these small end mills perform best at. Unfortunately, my machine can only do 20% of that.

If I limit the speed to 5100RPM, I'm having a really hard time getting reasonable feeds and depths of cut out of Gwizard without seeing the tool deflection number go red. It's suggesting a feed of 1 IPM with a 0.01" depth of cut. At that rate, my lockbar cut would take over an hour. And the tool is moving so slowly that I'd be concerned about rubbing.

Any best practices to keep in mind when using small end mills on a low-rpm machine?