CHIP SURFER & ROUND LINE GENERAL FORMULA FOR MILLING OPERATIONS Value Unit Formula Calculation example shoulder milling RPM min-1 n = v––c–×––––1–0––0––0– Workpiece material: 4340 D·p D·p·n Cutter type: HPC Cutting speed ft/min vc = ––1––0–0––0––– Cutter designation: 47D-3707R8RC02 Feed rate inch/min vf = fz · Zeff · n Cutter diameter: .375 Feed per tooth inch fz = ––––v–f–––Zeff · n Effective no. of teeth: 4 Chip removal rate cm3/min Q = a––e––1·–a0––p0––·0–v–f– Cutting depth ap: .125 Average chip thickness mm hm = fz · CDae/D Cutting width ae: .10 Cutting speed vc: 450 SFM Feed per tooth fz: .004 Calculation ofno. of revolutions:n =––4––5––0––·–1––2–– = 4584 min-1.375 · p Calculation of feed rate: vf = .004 · 4 · 4584 = 73.3 ipm Calculation ofchip removal rate:Q = 4584 x .125 x .10 x .004 x 4 = .91 in3/min Calculation ofaverage chip thickness:hm = .004 · CD.10/.375 = .002 in 453