Threading Technology – Clamping Technology 520

358 Thread Mills UNC UNF UN M MF NPSF Rp (BSPP) G W BSW, BSF NPT NPTF Rc (BSPT) STI BGF ZBGF GSF (Aero) GSF-Z GF(I), GF-Z GF-Vario-Z GF-H GF(I)-KEG ZGF(I) CIRC-GF Gigant FPC, FMC MoSys SELF-LOCK Accessories Tech. Info v c / f z Product Finder 4.4 Calculation of cutting data Cutting speed v c d 1 ∙ π ∙ n v c = –––––––– [SFM] 12 d 1 = Milling part diameter in inch n = Speed in rpm d 1 ∙ π ∙ n v c = –––––––– [m/min] 1000 d 1 = Milling part diameter in mm n = Speed in rpm Speed n v c ∙ 12 n = –––––––– [rpm] d 1 x π d 1 = Milling part diameter in inch v c = Cutting speed in SFM v c ∙ 1000 n = –––––––– [rpm] d 1 x π d 1 = Milling part diameter in mm v c = Cutting speed in m/min Feed speed contour v f v f = f z ∙ Z ∙ n [inch/min] f z = Feed per tooth in inch Z = No. of flutes v f = f z ∙ Z ∙ n [mm/min] f z = Feed per tooth in mm Z = No. of flutes Feed speed center orbit (with internal threads) v fM v f ∙ (D – d 1 ) v fM = ––––––––– [inch/min] D v f = Feed speed in inch/min D = Nominal thread diameter in inch d 1 = Milling part diameter in inch v f v fM v f ∙ (D – d 1 ) v fM = ––––––––– [mm/min] D v f = Feed speed in mm/min D = Nominal thread diameter in mm d 1 = Milling part diameter in mm Feed speed center orbit (with external threads) v fM v f ∙ (D + d 1 ) v fM = ––––––––– [inch/min] D v f = Feed speed in inch/min D = Nominal thread diameter in inch d 1 = Milling part diameter in inch v fM v f The contour feed entered is recalculated to the center orbit by the machine! If this should not happen (to be recognized by the noticeably increased machining speed or by tool breakage), then the center orbit feed must be entered manually. v f ∙ (D + d 1 ) v fM = ––––––––– [mm/min] D v f = Feed speed in mm/min D = Nominal thread diameter in mm d 1 = Milling part diameter in mm