Bird’s nest of one long stringy chip, with a short brazed carbide boring bar hiding in there somewhere. I’m making a bench block as a simple project, but the random piece of steel I chose from the scrap bin happened to be this super tough tool steel or some shit that fucking HATES being cut. After fully annealing, this is the result I get. 1-7/8″ diameter bore, .040″ DOC, .005″ feed rate, 350 RPM. It screamed and howled for the entire bloody cut. Dropping the speed down to 210 and even 115 RPM didn’t stop it from screaming, nor did changing the depth of cut (but at least the chip was manageable with the slower spindle speed.) This steel is tough, tough, TOUGH. Chewed the shit out of my carbide too, had to re-grind it about 6 times.