Machining Speed & Feed Calculator

Calculate spindle speed and table feed for milling.

Live concept view — geometry scales with the entered design condition.

PRELIMINARY RESULT

Spindle speed2,387 RPM

Table feed: 763.94 mm/min

Calculation detail

Formula: N = 1000Vc / (πD); Vf = fz × z × N

Spindle speed follows cutting speed and tool diameter; table feed uses feed per tooth and tooth count.

Machining Speed & Feed Calculator: operating questions

Is the result a guaranteed cutting condition?

No. It is a starting spindle speed and table feed derived from selected cutting data. Tool engagement, material condition, rigidity, runout, coolant and machine power still govern the released setup.

What happens when spindle RPM is capped?

Recalculate table feed from the achievable RPM while preserving a justified chip load. Do not retain the original feed if doing so would increase feed per tooth beyond the tool recommendation.

Why can a correct feed still chatter?

Chatter is a dynamic stability problem influenced by tool overhang, radial engagement, structural modes and fixturing. The scalar speed-and-feed relation does not predict stability lobes.

Illustrative input values and units
Parameter	Unit	Example
Cutting speed	m/min	120
Tool diameter	mm	16
Feed per tooth	mm/tooth	0.08
Number of teeth	count	4

Technical verification

Equation checked: 2026-09-15 · Units checked: 2026-09-15 · Independent numerical case: Pass

Source basis: MANUFACTURER DATA — Sandvik Coromant, metric milling formulas and definitions

Unit basis: vc m/min; D mm; fz mm/tooth; n rpm; vf mm/min

Independent example: 120 m/min, 16 mm, 0.08 mm/tooth, 4 teeth: 2387.324 rpm; 763.944 mm/min.

Scope: Starting cutting data only; spindle power, tool life, runout, rigidity, chatter, engagement, coolant and material condition are not validated.

Technical verification is not professional engineering certification and does not approve a specific real-world design.