jyviko
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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
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Metric thread designations
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.
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.
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 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.