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jyviko
05f1c6b9ac
Every tapped hole now drills the tap maker's tabulated drill. ISO metric takes Yamawa YEU23's drill size column for cutting taps (printed p.704, M coarse; pp.704 to 706, MF fine): M8 drills 6.8 mm and M12 10.3 mm, where the major less the pitch gave 6.75 and 10.25. A custom metric size the table lacks keeps the major less the pitch. UNC/UNF (Guhring), G, Rp, Rc and NPT (Yamawa) were tabulated already. The Thread command's suggested hole for a metric size follows. The Hole dialog's Tap drill diameter is now a field, the tap maker's drill by default, and the command's `diameter` with a thread is checked the same way: a drill is accepted from the internal thread's standard minor diameter (or the tap maker's drill where that lies below it: Rp, Rc, NPT) to 5% over the tap maker's drill. Outside that the command names the range and why. The field's tooltip gives the drill, the minor diameter and the range. Presets keep a chosen drill. A saved design keeps the diameter it stored, so it builds as before, and editing such a hole keeps its drill: no preference and no format change. Scripts that give a thread without a diameter drill the new default; ladder 05/007, 11/003 and rig case threads/2115 follow analytically, and their golden entries are re-measured from runs (tier 05 re-sorted by time). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01LUXeKMoxpM7Vuv8Rb6E3K2
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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