Machining is best accomplished by utilizing high speed steel tooling for drilling operations. Carbide tools work well for turning or milling. Drilling (high speed steel) speeds 10-15 surface feet /minute with feeds of 0.001" (for 1/8 " dia. hole) to 0.007" (for 1" dia. hole) per revolution. Turning (carbide tools) at 90 to 110 surface feet per minute and feed of 0.010" (for roughing) to 0.006" (for finishing). Machining might be done dry or with standard coolants.