Ladder 06/008 had no way to ask for one: "solid.thread has no start count". `starts: n` (1 to
8) cuts n grooves of lead n x P, the j-th a j/n turn round from the first (the same helix j
pitches along), in one boolean with their union. A designation that gives the lead
(M16xPh3P1.5, Tr40x14(P7)) gives the starts, and a `starts` that disagrees is refused. The
helix's self-clearance check and the turn limit use the lead.
Over the same length n grooves of lead nP take the volume of one start of pitch P: engine test
(2 and 3 starts, M10xPh3P1.5) within 1e-4 of the closed form, ladder 06/008 graded as 001
(measured 3.5e-7 off).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
jyvikoandClaude Opus 5.5
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