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
Tapping calculator
Choose the thread and the tap type: we give you the tap drill size, spindle speed, the synchronised feed to set and the time per hole.
Thread and tap
m/min
High-speed steel taps: typically 8–20 m/min in steel; forming taps can run faster. Starting values are in the datasheet of every INNOT tap.
mm
rpm
Results
Tap drill size
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Spindle speed (n)
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Synchronised feed (Vf)
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Time per hole (in and out)
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Minor diameter D1 (min)
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Minimum tap drill depth
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Formulas: cutting tap drill = D − P · forming tap drill ≈ D − 0.5·P · n = 1000·Vc / (π·D) · Vf = n·P (in rigid tapping the feed always equals the pitch) · D1 = D − 1.0825·P · time = 2·L / Vf. The minimum drill depth allows for the tap chamfer length (about 3 extra pitches in blind holes).
