So, I got this 4"x4"x1/4" ceramic sheet: https://www.amazon.com/gp/product/B00I2UC9H2/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1
Here are the feeds and speeds I guesstimated, based on a few small pockets I made with a 1/16 stock endmill #112:
The job ran for about 4 hours with a cutter that’s pretty used. It’s spent about 10-15 hours on cutting plastics. I did look under a microscope and the cutter it not in the best of shapes. Still reasonably sharp before and after this job.
Another half-hour with a diamond file and we have the parts! They are 1.5" OD.
Overall, very happy with the performance and I can definitely kick the machine up a notch or two.
Dear Nomad, I love you!