Formulae for face milling Cutting speed Feed per Tooth Cutting Time vf (mm/min) Table Feed per Min L (mm) Total Table Feed Length (Workpiece Length

Formulae for face milling Cutting speed Feed per Tooth Cutting Time vf (mm/min) Table Feed per Min L (mm) Total Table Feed Length (Workpiece Length

Formulae for face milling Cutting speed Feed per Tooth Cutting Time vf (mm/min) Table Feed per Min. L (mm) Total Table Feed Length (Workpiece Length (l)+Cutter Diameter (DC)) d) et) DC (Problem) What is the cutting time required for finishing 100mm width and 300mm length surface of a cast iron (JIS FC200) block when the cutter diameter is 0200mm the number of inserts is 16 the cutting speed is 125m/min and feed per tooth is 0.25mm. (spindle speed is 200min"1) (Answer) Calculate table feed per min vf0.25x16x200800mm/min Calculate total table feed length. L300+200500mm Substitute the above answers into the formula. 500 Tc 800 0.625 (min) 0.625x6037.5 (sec). The answer is 37.5 sec. Q016 TECHNICAL DATA TECHNICAL DATA (vc) wDC n . vc rrrr (m/min) 1000 vc (m/min) Cutting Speed n (3.14) Pi DC (mm) Cutter Diameter n (min-1) Main Axis Spindle Speed Divide by 1000 to change to m from mm. . . (Problem) What is the cutting speed when main axis spindle speed is 350min'1 and the cutter diameter is oil 25 (Answer) Substitute 7r3.14 DC125 n350 into the formula. C n VC - jr-DC-n 3.14x125x350 DC 1000 1000 The cutting speed is 137.4m/min. 137.4m/min FEED PER TOOTH (fz) fz (mm tooth) z Insert Number vf (mm/min) Table Feed per Min. n (min-1) Main Axis Spindle Speed (Feed per Revolution f z x fz) (Problem) What is the feed per tooth when the main axis spindle speed is 500min'1 number of insert is 10 and table feed is 500mm/min (Answer) Substitute the above figures into the formula vf 500 fz z n 10x500 The answer is 0.1 mm tooth. 0.1 mm tooth TABLE FEED (vf) vf (mm/min) Table Feed per Min. z Insert Number vf fz z n (mm/min) fz (mm tooth) Feed per Tooth n (min-1) Main Axis Spindle Speed (Problem) What is the table feed when feed per tooth is 0.1 mm tooth number of insert is 10 and main axis spindle speed is 500min"1 (Answer) Substitute the above figures into the formula vf fzxzxn 0.1x10 500 500mm/min The table feed is 500mm/min. CUTTING TIME (Tc) Tc (min)