Had to turn up a small spacer today, thought I'd show you all what carbide at 1000 rpm in 1045 mild steel looks like for all the "my lathe is too slow for carbide" people.

16mm bore with an Iscar CCMT 060202-PF IC907 in a 12mm boring bar; approx 0.15mm depth of cut, 0.14mm/rev (about 5 thou) feed
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Parting with an Iscar DGR 2202J-6D IC20 (2.2mm wide, right hand parting insert for soft materials); hand feed
PXL_20201029_022452783.jpg

The recommended surface speed for the turning insert is 100-170 m/min, actual surface speed in the bore was 50 m/min
The recommended surface speed for the parting insert is 190-260 m/min, actual surface speed during parting was 85-50 m/min (27mm OD to 16mm ID)

The point I'm trying to make here is that you don't necessarily need to take huge cuts at high speed to get great results if you get the right inserts, even when you're going waaaay slower than what the packet says you should.
Attached Images




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