GENERAL TECHNICAL INFORMATION ■ Recommended Cutting Conditions • Recommendations given are normal machining conditions. If excessive wear occurs, select an insert in a harder grade. If chipping or breakage occurs, select an insert in a tougher grade. • The high end of the cutting speed recommendations given are for insert widths of .118 inch and over at low-to-medium feeds. For smaller insert widths or machining at high feeds, choose a lower cutting speed. • Optimal grade selection depends also on workpiece material, diameter and rigidity of the system. ■ Recommended Cutting Conditions • T-Clamp Ultra Plus Grade Grade Grade Materials HardnessBrinell HB TT8020 TT7220 TT9030TougherHarder Cutting Speed (sfm) 0.2%C 150 360-560 Carbon Steel 0.45%C 190 330-490 .83%C 250 280-460 200 280-460 200-250 320-460 Alloy Steel 275-325 200-360 325-375 165-330 375-425 130-200 150 260-430 Cast Steel,Carbon Alloy 150-200 230-390 250-300 200-330 175-225 330-490 Martensitic 275-325 230-380 Stainless Steel 375-425 200-330 Austenitic 135-175 200-430 1353