Here’s what it looks like with a 3.344 K-Factor (proportionally reduced power and force) and the latest version of the workbook. I corrected an error in the bit deflection calculation when the shank diameter exceeds the cutter diameter.
2019-08-28 Speeds and Feeds Workbook.zip (155.7 KB)
NYCCNC’s K-Factor for 6061-T6 Aluminum is lower than the 4-5 most calculators use. So it’s probably conservative (overestimates the cutting power and force requirements). Once you start using your HF Spindle you’ll be able to measure it.
It’s also pretty easy and inexpensive to build an ac power meter to use with AC routers and power supplies powering brushless motors.