Transcription of Common Drilling Formulas - Guhring, Inc.
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Common Drilling Formulas - Guhring, Inc.
Common Drilling FormulasRPMRPM = vc x 12 x D or RPM = ( / D) x SFM(rev/minute)Cutting Speedvc = RPM x x D 12 or SFM = x D x RPM(ft/min)Feed Ratevf = IPR x RPM(inch/min)Cross-sectionarea of holeAT = x R2(in2)Material Removal RateQ = vf x AT(inch3/min)PowerRequirementPc = D/4 x f x vc x kc 33,000 x (Hp)TorqueMc = Hp x 5252 RPM(ft/lbs)Feed Force (approx.)Ff = .7 x D/2 x f x kc(lbs)Machining TimeTc = L + H vf or Tc (seconds) = (60 x feed minus stroke) IPM(Min/piece)f = Feed per revolution (IPR) (inch/rev)h = Distance from drill point to workpiece before feeding (inch)kc = Specific cutting force (Lbf/inch2)L = Depth of hole (inch) = Machine efficiency (%)D = Tool diameter (inch)
Common Drilling Formulas RPM RPM = vc x 12 3.14 x D or RPM = (3.8197 / D) x SFM (rev/minute) Cutting Speed vc = RPM x 3.14 x D 12 or SFM = 0.2618 x D x RPM
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