Cutting parameters calculator
Cutting speed, spindle RPM and feed for turning, milling and drilling
Calculators — FAQ
Where do these speed values come from?+
Typical mid-range values from Sandvik Coromant, ISCAR catalogs and GOST 25762. For specific tool brands and metal lots, real-world numbers may vary ±20-30%. Use the calculator as a starting point, then tune for tool life and surface finish.
How do you convert V to spindle RPM?+
n (rpm) = (V × 1000) / (π × D), where V is cutting speed in m/min and D is workpiece or tool diameter in mm. The calculator does this automatically — enter the diameter and get the RPM.
What's 'feed per tooth' for milling cutters?+
Feed per tooth (fz) is the chip thickness removed by one tooth per revolution. Table feed = fz × number of teeth × spindle RPM. Higher fz for roughing (productivity), lower for finishing (surface quality).
Why is aluminum machined so much faster than stainless?+
Aluminum has low hardness, high thermal conductivity (heat leaves the cutting zone fast) and low abrasiveness. Stainless is the opposite: high strength, low conductivity (heat goes into the tool), work-hardening — so speeds are 3-5× lower.
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