fraisa.com 345 i n = vc · 1000 1 min d 1 · S v =c d · S · n m min 1000 v =f P · n mm min v =f fz · z · n mm min a d d1 d2 D1 d/D1 Rk fz l l1 l3 L LK n P vc vf vfc Rm HRC HV HB ' Formulas and abbreviations Dimension of square end Nominal diameter of the thread Drilling diameter of the drill / thread milling cutter Diameter of the shank Diameter of the thread milling cutter Ratio of diameters for the determination of the feed speed Corrected milling cutter radius for ISO 2 (6H) thread tolerance (radius to be programmed in the machine control system) Feed per tooth Length of threaded section of the tap / thread former / thread milling cutter Neck length of the tap / thread former / thread milling cutter Flute length of the tap Overall length of the tap / thread former / thread milling cutter Countersinking depth of the thread milling cutter with chamfer Spindle speed Thread pitch Cutting speed Feed rate Feed speed in the tool centre Number of flutes on the tap and thread cutter Number of form edges of cold forming taps Diameter differences of the thread flank, the thread outside and the thread core in the application class 2 (ISO 2) according to DIN 22857 Mechanical tensile strength Hardness according to Rockwell C Hardness according to Vickers Hardness according to Brinell Spindle speed Cutting speed Feed rate Taps Feed rate Thread milling cutters
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