The parameters in this post are mostly good, but the #4 carbide drill bit chipped after seemingly everything was done right. I could increase the spindle speed or decrease the plunge feed rate by ~10% each, but I have gotten frustrated trying to get the parameters for this drill bit dialed in. The issue is a combination of carbide's sensitivity to parameters, the four facet (narrower spiral) point, or the 118° point angle.

Instead, I used this #4 Cobalt Steel drill bit with a TiN coating to make 4 test holes. This drill bit has a split point and 135° point angle to hopefully prevent chipping of the bit. I used a spindle speed of 506 rpm and a feed rate of 1.68 in/min, what FSWizard recommended.

Separately to figuring out these parameters, I also wrote some Python code to edit my G-Code so that the spindle reverses to clear chips, stops coolant and dwells above the part so that I can visually make sure the chips are gone, and then resumes the cutting cycle. This works very well.

Tomorrow, I will finally machine the 10" flange.

In the post after I've made the flange, I will post the CAD, CAM, G-Code, and python script.