rpmThe spindle only reaches {max} rpm: the actual cutting speed is {vc} m/min.With this radial engagement the chip gets thinner: to keep the maximum chip thickness equal to fz you can raise the feed up to {fz} mm/tooth.The required power exceeds the spindle power entered: reduce ap, ae or the feed.Deep hole: beyond 5×D use a long drill with internal coolant and a pilot hole.Above 45 HRC you are in ISO group H (hardened steels): dedicated end mills and grades are needed.Value outside the conversion table.steelshardened steelsInserts and end mills for steelEnd mills for hardened steels
INNOT tools
Drilling calculator
Enter the drill diameter, cutting speed and feed per revolution: you get spindle speed, feed, time per hole, power, torque and thrust force to check against your machine.
Cutting data
mm
m/min
Solid carbide drills in steel: typically 70–120 m/min. The exact value is in the drill datasheet.
mm/rev
mm
Used to estimate specific cutting force (kc), power and torque.
rpm
n°
Results
Spindle speed (n)
–
Feed rate (Vf)
–
Drilling time
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Metal removal rate (Q)
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Cutting power (Pc)
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Torque (Mc)
–
Thrust force (Ff)
–
Depth in diameters
–
Formulas: n = 1000·Vc / (π·D) · Vf = n·fn · time = (L + 0.3·D) / Vf per hole (with a 140° point) · Q = π·D²/4 · Vf / 1000 · Pc = fn·Vc·D·kc / 240000 · Ff ≈ 0.5·kc·(D/2)·fn·sin 70°. Indicative values for two-flute solid drills.
