kerfmaster pin list · Big capabilities
intentWhat we want to build. Never claimed the present, so it cannot be stale — and must never be read as a description of the code.
Content last changed 2026-08-06 — computed from the item itself, not typed.
Contract — Bridges stage
This contract describes a stage we intend to build — it is NOT a description of the code.
takes stack-up
makes bridged-part
fails if Added metal that shows up in the visible-composite diff.
Contract last changed 2026-08-06 — computed, not typed. Dated separately from the text above, so neither date can speak for the other.
The capability. Given a stack-up — which plate sits above which, at what standoff — compute each lower plate's concealed area: the region a viewer cannot see because something in front of it covers it. Any structural metal we have to invent is then routed inside that envelope, and the problem is solved at its boundary, because the constraint is an inequality: stay under the cover, and use as much of it as you need.
The acceptance test is a diff of the rendered visible composite, not of the geometry. Preserve what is visible, not what is drawn. Two plates whose geometry differs by tens of square inches can be visually identical, and that is the whole point of the envelope; a geometry diff would reject the correct answer.
Derived from Aristide's MVT fix, which is the worked example: he added 4.30 in² of metal, reaching radius 41.7 against the ring's outer 41.8 — every bit of it inside the envelope, nothing protruding — and got a 1.029 inch neck out of it. The alternative that was proposed instead (a hidden rib) was worse on area, on weight and on neck width. Solving at the boundary is what made the difference.
src — MVT icon, 2026-08-06;
cadmaster/LESSONS_MVT_ASSEMBLY.md,
cadmaster/MVT_MODIFIED_MEASURED.md. Typed intent: none of it
is built.