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amolinari-autotex
19db763899
* feat: expand tapped-hole catalogue with metric fine and Unified sizes * docs: distinguish metric designations from expanded tapped catalogue * feat: add internal pipe catalogue and checked Rc profile data * Connect parallel G and Rp catalogues to cylindrical tapped holes * fix(i18n): register tapped thread catalogue labels * fix(i18n): complete thread labels in required locales
8 lines
1.1 KiB
Markdown
8 lines
1.1 KiB
Markdown
# Metric thread designations
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Generated size choices use the shared metric catalogue. Its coarse pitch is omitted from the designation: **M8** means diameter 8 mm and coarse pitch 1.25 mm. A fine or custom pitch remains explicit, for example **M8x1**. Hole catalogue choices and generated Thread size/pitch choices follow the same rule.
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This changes generated UI text, not the resolved numerical pitch or geometry. Existing authored designation text, including explicit legacy coarse pitches, is retained when a dialog is merely displayed. Custom and fine designations remain editable. Catalogue dimensions are millimetres regardless of the design's display units.
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For ISO metric tapped holes, the existing tap-drill estimate remains nominal diameter minus pitch: M8 gives 6.75 mm, while M8x1 gives 7 mm. Saving and reopening retains the resolved pitch. See the [tapped-hole catalogue](thread-catalogue.md) for the additional metric fine choices and finite UNC/UNF and parallel G/Rp catalogues with their tabulated pilot recommendations. The separate Thread command remains ISO metric only.
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