INDEXABLE MILLING RECOMMENDED CUTTING CONDITIONS Ramping / Helical Milling Blind Holes, a Ramping a Helical Milling Flat Bottom Through Holes L Pitch(P) Pitch(P) L= APMX tan% RMPX APMX DC DC DC Hole Hole Refer to the table below for cutting conditions. For feed per tooth and cutting speed, Diameter Diameter follow the cutting conditions for slot milling. (DH) (DH) ( inch) Cutting Ramping Helical Milling (Blind Hole, Flat Bottom) Helical Milling (Through Hole) EdgeDiameterRE MaximumRamping AngleMinimum Distance * Maximum Hole Diameter MaximumPitch MinimumHole DiameterMaximumPitchMinimumHole DiameterMaximumPitch DC RMPX L DH max. P max. DH min. P max. DH min. P max. .008 1.87° 9.7 1.213 .060 1.072 .046 .942 .032 .016 1.87° 9.7 1.197 .059 1.073 .046 .942 .032 .625 .031.039 1.87°1.87° 9.7 1.165 .055 1.073 .046 .942 .0329.71.150.0541.073.046.942.032 .047 1.87° 9.7 1.134 .052 1.073 .046 .942 .032 .063 1.87° 9.7 1.102 .049 1.073 .046 .942 .032 .008 1.43° 12.6 1.463 .056 1.323 .045 1.187 .034 .016 1.43° 12.6 1.447 .055 1.323 .045 1.187 .034 .750 .031.039 1.43°1.43° 12.6 1.415 .052 1.323 .045 1.187 .03412.61.400.0511.323.0451.187.034 .047 1.43° 12.6 1.384 .050 1.323 .045 1.187 .034 .063 1.43° 12.6 1.352 .047 1.323 .045 1.187 .034 .008 1.14° 15.9 1.713 .052 1.574 .044 1.435 .035 .016 1.14° 15.9 1.697 .051 1.574 .044 1.435 .035 .875 .031.039 1.14°1.14° 15.9 1.665 .049 1.574 .044 1.435 .03515.91.650.0481.574.0441.435.035 .047 1.14° 15.9 1.634 .047 1.574 .044 1.435 .035 .063 1.14° 15.9 1.602 .045 1.575 .044 1.435 .035 .008 .95° 19.0 1.963 .050 1.824 .043 1.685 .036 .016 .95° 19.0 1.947 .049 1.824 .043 1.685 .036 1.000 .031.039 .95°.95° 19.0 1.915 .048 1.824 .043 1.685 .03619.01.900.0471.824.0431.685.036 .047 .95° 19.0 1.884 .046 1.824 .043 1.685 .036 .063 .95° 19.0 1.852 .044 1.825 .043 1.685 .036 .008 .82° 22.0 2.213 .049 2.074 .043 1.935 .036 L .0161.125.031.039 .82°.82°.82° 22.0 2.197 .048 2.074 .043 1.935 .03622.02.165.0472.074.0431.935.03622.02.150.0462.074.0431.935.036 .047 .82° 22.0 2.134 .045 2.074 .043 1.935 .036 .063 .82° 22.0 2.102 .044 2.075 .043 1.935 .036 .008 .71° 25.4 2.463 .047 2.320 .042 2.183 .036 .016 .71° 25.4 2.447 .047 2.320 .042 2.183 .036 1.250 .031.039 .71°.71° 25.4 2.415 .045 2.320 .042 2.183 .03625.42.400.0452.320.0422.183.036 .047 .71° 25.4 2.384 .044 2.320 .042 2.183 .036 .063 .71° 25.4 2.352 .043 2.321 .042 2.183 .036 Note 1) When machining a highly ductile work material with the ramping angles in the table above, chips may be elongated. * Shows the distance until a maximum depth of cut of .315" is achieved at the maximum ramping angle L (= .315"/tan α). L138 INDEXABLE MILLING