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jyviko
01be42ef41
2 commits, squashed; the originals stay reachable from tag archive/merge-main-develop. -05f1c6b9ajyviko: Tapped holes: the tap maker's drill for every form, and a drill of the user's within 5% -87e7fe472jyviko: Tapped holes: a preference keeps metric's major-less-pitch drill Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01DtL5M41G8Nua7HvuFPZkmJ
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 drill is the tap maker's for the size (M8 gives 6.8 mm, M8x1 7 mm), and nominal diameter minus pitch for a custom size the table lacks. 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 Thread command's forms are in [Threads](threads.md).
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