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
The thread dialog offers the pipe threads: G (ISO 228-1), Rp (ISO 7-1), R and Rc (ISO 7-1) and
NPT (ASME B1.20.1). Their sizes are listed by designation without a pitch, one start and a hand
of right or left; a size picked for a hole the dialog sized Rc stays Rc.
Rp, ISO 7-1's parallel internal thread an R screws into, is a form of its own (`rp`): the
parallel profile (H = 0.960491 P) at ISO 7-1's gauge diameters, refused on a shaft. Its cut
meets the analytic material of its profile within 1e-5, as G does.
A taper thread takes a chamfered tip: each end's cone is measured from the major diameter the
taper has at that end. Pipe threads are not ISO metric, so they give chamfer_depth.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
A thread's start runs off its free end, plain or chamfered; only its inner end fades out
(ease_out) or stops square. The `ease_in` field, the command parameter (refused now, naming
ease_out), the dialog's Ease In row and their docs are removed; `pending/thread-ends.rs`
drops a saved `ease_in` as the design opens. The runout test covers the short, standard and a
sub-turn fade at the inner end.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Three forms: `bspp` (G, ISO 228-1, 55° parallel), `bspt` (R external, Rc internal, ISO 7-1,
55° taper 1 in 16) and `npt` (ASME B1.20.1, 60° taper 1 in 16). Their sizes are tabulated
from the public sources: ISO 7-1:1978 Table 1 (its gauge-plane diameters are the G sizes)
and NBS Handbook H28 (1957) Table VII.2; tests check every row against the standards' own
relations.
A taper thread starts at its free end with its standard diameter there (external: the gauge
diameter its gauge length in, internal: at the face). Its groove is the screw sweep with the
section moved 1/32 of the axial travel off the axis (the radial law the runouts use, added to
it), its section reaching just past the crest, and the material beyond the major cone (or
inside the minor cone) is cut with it, as a die or tap cuts the crests. An external one runs
its standard length by default.
The volumes are checked against the profile's material fraction integrated over the tapered
radii: G 1/2 to 2e-6, R 1/2, Rc 1/2 and 1/2-14 NPT within 0.2 % of the cut.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
`tip` was none|chamfer, chamfer cutting every free end. It is now none|start|both: `start`
chamfers the end the thread starts from, refused when that end is not free (a shoulder, or a
stop inside the face), and `both` every free end as `chamfer` did. The dialog's Tip pick offers
None, Start and Both; `tip: chamfer` in a command names its replacements.
The thread's end options (runouts, tip, chamfer angle and depth) came without a format
change file; `pending/thread-ends.rs` records them and rewrites a saved `tip: chamfer` to
`both`.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
ISO 4753's chamfered end bounds the end's diameter by the minor diameter. The default took the
modelled root (the basic d1) for it, so the cone's small circle lay on the root cylinder and
the chamfer ring pinched to nothing wherever the groove reached the end. The default is now
the external minor diameter d3 = d - 1.226869 P of ISO 724, below d1: the cone crosses the
root, each end is a whole disk of d3 inside a whole conical ring. ISO 4753 is for ISO metric
threads; the other forms, whose root is already their design minor, give chamfer_depth.
Ladder 06/017's analytic volume follows (1945.354522563); its golden entry re-measured.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Ladder 06/009 had no way to ask for one: "solid.thread has no runout (vanishing thread)
length". With SMLib's smlib_screw_sweep_radial (replay e7acea1):
- smlib: the FFI binding and Brep::screw_sweep_radial, the profile moved off the axis by a
piecewise linear law of the turn; crate test: a tooth moved out 1 mm over three turns has
A 2π (c turns + ∫ offset dt).
- kernel: sweep_helix_radial, sharing sweep_helix's checks (helix_profile).
- doc: `ease_in`, `ease_out` (a length, or ISO 3508's standard 2.5 P or short 1.25 P) fade the
groove over that length, its section moving out of the material as it turns (outward for a
shaft, inward for a nut). ease_in is at the end the thread starts from. The runout lies past
the full-form length: beyond a square stop, before a shoulder up to its clearance; at a free
end inside the face. Runouts longer than the thread are refused. No end gets one by default,
so saved threads keep their geometry.
The cut is the integral over the turn of the clipped section's 2π∫ r dA: engine test (2.5 P
and 1.25 P between two collars) within the sweep's wall tolerance times the runouts' wall area
(0.029 against a 0.036 mm³ bound), ladder 06/009 (004's shaft, a 2 P runout before the
shoulder) graded in closed form (measured 1.7e-6 off).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Only the ISO metric 60° thread existed. Forms now (crates/doc/src/thread_forms.rs, values and
sources in docs/threads.md): ISO metric (ISO 68-1), trapezoidal (ISO 2904 design profile, ISO
2902 sizes), general purpose Acme (ASME B1.5), metric buttress 3°/30° (DIN 513), buttress inch
7°/45° (ASME B1.9 basic profile). Each has its groove as a straight-flanked polygon, its standard
sizes (none for ASME buttress), its designations (M10, M16xPh3P1.5, Tr40x14(P7), S20x4,
1/2-10 ACME, 2.5-8 BUTT) and the size that fits a face. The square thread is refused: no current
standard defines it.
`hand: right | left | both`: a left-handed groove is the screw motion about the reversed axis
rising along it; both cuts the two grooves, crossing, in one boolean. `steep_flank` turns a
buttress. The design diameters are checked against the published tables (ISO 2904/DIN 103,
DIN 513 via IS 4696-3); every form's cut against 2π∫ r w(r) dr per turn to 1e-4 in engine tests
and to 1e-4 in ladder 06/011 to 016 (they measure within 5e-7).
FeatureKind::Thread holds every option the command has (form, hand, starts, ease_in, ease_out,
tip, chamfer_angle, chamfer_depth, steep_flank, all defaulted so saved threads load unchanged);
starts, runouts and the chamfered tip are refused as not built yet. suggested_thread_in takes the
form.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
jyviko