Formulae for drilling Cutting speed Feed of the main spindle (vf) What is the drilling time required for drilling a 30mm length hole in alloy steel

Formulae for drilling Cutting speed Feed of the main spindle (vf) What is the drilling time required for drilling a 30mm length hole in alloy steel

Formulae for drilling Cutting speed Feed of the main spindle (vf) What is the drilling time required for drilling a 30mm length hole in alloy steel (JIS SCM440) at a cutting speed of 50m/min and a feed 0.15mm/rev 50x1000 (Answer) Spindle Speed n 15x3.14 11061.57min'1 Tc 30x1 1061.57x0.15 0.188x6011.3 sec 0.188 Q027 TECHNICAL DATA (vc) vc 7T PC n 1000 (m/min) vc (m/min) Cutting Speed DC (mm) 7t(3.14) Pi n (min-1) Drill Diameter 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 1350min'1 and drill diameter is 12mm (Answer) Substitute 7T3.14 DC12 n1350 into the formula vc - jr DC n 3.14x12x1350 1000 1000 The cutting speed is 50.9m/min. 50.9m/min vf (mm/min) Feed Speed of the Main Spindle (Z axis) vf f-n (mm/min) f (mm/rev) Feed per Revolution n (min-1) Main Axis Spindle Speed (Problem) What is the spindle feed (vf) when the feed per revolution is 0.2mm/rev and main axis spindle speed is 1350min'1 (Answer) Substitute f0.2 n1350 into the formula vf fxn 0.2x1350 270mm/min The spindle feed is 270mm/min. i Drilling time (Tc) Tc (min) Drilling Time ld i n (min'1) Spindle Speed Tc Id (mm) Hole Depth n f f (mm/rev) Feed per Revolution i Number of Holes (Problem)