
CHIP SURFER & ROUND LINE GENERAL FORMULA FOR MILLING OPERATIONS Value Unit Formula Calculation example shoulder milling vc × 1000 Workpiece material: 4340 RPM min-1 n = ––––––––––––– D·p D·p·n Cutter type: HPC Cutting speed ft/min vc = –––––––––– 1000 Cutter designation: 47D-3707R8RC02 Feed rate inch/min vf = fz · Zeff · n Cutter diameter: .375 v Feed per tooth inch fz = –––––f––– Zeff · n Effective no. of teeth: 4 ae · a p · v f Chip removal rate cm3/min Q = –––––––––––– Cutting depth ap: .125 1000 Cutting width ae: .10 Average chip thickness mm hm = fz · CD ae/D Cutting speed vc: 450 SFM Feed per tooth fz: .004 Calculation of 450 · 12 n = –––––––––––––– = 4584 min-1 no. of revolutions: .375 · p Calculation of feed rate: vf = .004 · 4 · 4584 = 73.3 ipm Calculation of Q = 4584 x .125 x .10 x .004 x 4 = .91 in3/min chip removal rate: Calculation of hm = .004 · CD .10/.375 = .002 in average chip thickness: 453