A steel tube is cold-worked so the wall is thicker at the ends — where stresses concentrate at welded joints — and thinner in the middle, where stress is lower. The reason a chromoly bicycle frame can be light without being weak. Specialty process; mostly seen in frame-builder supply.
Mandrel-controlled cold drawing varies wall thickness along the length of a tube. Single-, double-, and triple-butted profiles place material where shear and bending demand it (joint regions) and remove it from the middle. Standard product from Reynolds (UK), Columbus (Italy), True Temper, Tange.
A working library of materials and processes. Saves to this browser only — no account, no cloud.
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House vocabulary — terms ForMatter uses with intent.
Materials and processes for people who design and make things.
A local-first library of materials, processes, and applications, equal weight, citable everywhere. Part of the renato.design ecosystem — sibling of Plenum, Specimen, Ingenue, gesture, graf, and the Renato Rhino plug-ins. Form and matter, inseparable.
Half of teaching materials is teaching how the material is made into the thing. The standard subscription library was always light on that half. The wedge here isn't better samples or a prettier interface — it's treating Process as a peer entity, not a footnote.
Conway's Material World on raw materials, Lefteri's Making It on processes, Untracht and McCreight on metalsmithing, USDA Forest Products Lab on woods, GIA on gemstones, Schott / CoorsTek / Toray / Owens Corning datasheets, MakeItFrom for verifiable property numbers, ASM Handbook, ISO standards. Voice blocks: Barthes, Yanagi, Benjamin channeled within their philosophy; Lefteri verbatim. All cited.
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