I got some Iscar inserts in DCMT and CCMT. I dropped the feed down and gave them a try. I also switched to kool-mist. All cuts are run at 380 RPM.
The DCMT still makes stringy chips, but I can get 0.090 cuts without stalling. The lathe is obviously working hard, but it works and has a decent finish.
CCMT in a SCLCR holder, past about 0.040 the chip breaker starts working nicely and I get very clean chips. I was able to get 0.090 as well, with similar sounds coming from the lathe. With faster feed and a 0.030 cut, the finish is very nice with good chip control.
Heat was significantly lower, even without the coolant. The coolant kept it warm to the touch after a cut, but not uncomfortable.
I suspected brand name inserts would be better, but these are enough of a difference to make the material useful.
The DCMT still makes stringy chips, but I can get 0.090 cuts without stalling. The lathe is obviously working hard, but it works and has a decent finish.
CCMT in a SCLCR holder, past about 0.040 the chip breaker starts working nicely and I get very clean chips. I was able to get 0.090 as well, with similar sounds coming from the lathe. With faster feed and a 0.030 cut, the finish is very nice with good chip control.
Heat was significantly lower, even without the coolant. The coolant kept it warm to the touch after a cut, but not uncomfortable.
I suspected brand name inserts would be better, but these are enough of a difference to make the material useful.