import type { EffectiveDiameterInput, EffectiveDiameterResult } from './types.js';
/**
 * Calculate the effective cutting diameter of a ball end mill at a given depth of cut.
 *
 * @formula
 *   Deff = 2 × √(ap × (D − ap))   for ap ≤ D/2
 *   Deff = D                       for ap > D/2 (cut reaches the cylindrical shank)
 *   rpmCorrectionFactor = D / Deff
 *   effectiveRpm = (Vc × 1000) / (π × Deff)   when cuttingSpeed (Vc) is provided
 *
 * The effective diameter determines the actual cutting speed at the depth of cut,
 * which is smaller than the nominal diameter unless cutting at or beyond the equator.
 * Multiply the nominal spindle RPM by `rpmCorrectionFactor` to restore the programmed
 * surface speed at the engaged diameter.
 *
 * @reference Sandvik Coromant — Ball nose end mill effective cutting diameter.
 *
 * @units toolDiameter, axialDepthOfCut: mm; cuttingSpeed: m/min; effectiveRpm: RPM
 * @validation toolDiameter > 0; 0 < axialDepthOfCut ≤ toolDiameter; cuttingSpeed > 0 when provided
 * @throws RangeError when toolDiameter ≤ 0, axialDepthOfCut is outside (0, toolDiameter], or cuttingSpeed ≤ 0
 *
 * @param input - Effective diameter parameters
 * @returns EffectiveDiameterResult with effective diameter, RPM correction factor, and effective RPM when Vc is given
 */
export declare function effectiveDiameter(input: EffectiveDiameterInput): EffectiveDiameterResult;
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