Radial Chip Thinning Feed Compensation
The feed correction the speeds-and-feeds tile never makes: at a radial width of cut below half the cutter diameter, the chip is thinner than the programmed feed per tooth, so RCTF = 1/(2 sqrt((ae/D) - (ae/D)^2)) raises the feed to restore the intended chip load. At 10% radial engagement RCTF 1.667 (feed two-thirds higher); at half immersion RCTF 1.0, the crossover where compensation stops. The basis of high-feed and trochoidal milling, and the difference between a light pass that rubs and one that cuts. Radial thinning only. A shop aid; the tool maker's chip load governs.
Formula and source
r = ae/D; RCTF = (r < 0.5) ? 1/(2 sqrt(r - r^2)) : 1.0; fz_prog = fz_target x RCTF.
The radial-chip-thinning geometry - the chip thinning factor RCTF = 1/(2 sqrt((ae/D) - (ae/D)^2)) for ae below half the cutter diameter and the compensated feed - as compiled in the modern milling and Machinery's Handbook references, by name.
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