Very nice 👍👍

Thanks I leaned something

Clever, I'll have to remember that one

316..tough stuff and stringy chips. Beautiful plus you timed the operations. I used to work in a plant that did stuff like this in addition to pressure vessel fabrication. They had a huge CNC burn table with oxy and plasma. Trepanning was not used as it took too long.

Get a roughing carbide endmill. Guhring makes a series with Firex coating that I really like. Then just have at least air blast on it, and do your slots in incremental step downs, 50-100 thou at a time depending on material and diameter. Once it's all roughed out, come back with a finishing endmill to make it nice and bring it to size.

As far as deep slotting goes we pretty much run whatever is handy, 2,3,4 flute etc. I find you have to run 4 flute shallower otherwise they blow up recutting chips, you can definitely tell a difference running two flute. I would run a fine tooth roughing end mill with air or coolant blast to clear chips and finish with a standard end mill. Since I started running CNC I run 4 flute full depth with a 10% step over & two flute for slotting up to 1/2D. That is pretty much max for full dia slotting for any endmill. I hate 316.