Umut CANandClaude Opus 5
ac6c4075ba
engineering/mech/features.py is the nineteen typed features of spec section 5,
each answering the same four questions - is my placement legal, what do I
contribute to this view, to a cut face, and what dimension do I want - plus the
five structural hooks the view engine needs: removal_box, radial_edit,
corner_edit, outline_edit and omission. Pure arithmetic; a test asserts emitted
primitive tuples, not a screenshot.
Nothing restates a table the repository already owns: Keyway takes its width
and depth from engineering.keyway (DIN 6885-1) and is refused by name outside
that table's bore range; GearTeeth takes its outline from engineering.gear's
involute generator and is refused when its tip diameter disagrees with the
segment it sits on.
standards/threads.py transcribes ISO 261 Table 1 and Table 2 - first-choice
M1.6-M64 plus second-choice M14/M18/M22/M27/M33/M39/M45/M52/M60 - and computes
ISO 724's basic minor and pitch diameters from ISO 68-1's own formula, pinned
against the published values (M20x2.5 -> 17.294 / 18.376). The remaining
second-choice diameters, every third-choice diameter and fine pitches below M8
are not transcribed and are refused by name, never interpolated. The drawing
rules are ISO 6410: minor at 0.8 x major, a thread-length limit line across the
major, a three-quarter circle in the end view, and an internal thread whose
section hatch runs to the major diameter.
standards/{undercuts,rings,centres,orings}.py ship DIN 509, DIN 471/472,
DIN 332-1 and ISO 3601-2 with their SOURCE, their row-key contract and an
**empty** row set. That is deliberate and is the track's table rule taken at its
word: a row that could not be verified against the standard is not shipped,
because a wrong relief depth or groove diameter is a wrong workshop drawing
while a narrow table is merely narrow. Every lookup is refused by name and says
what to transcribe and where; the features accept explicit dimensions so the
geometry is fully exercised, and DIN 332 form R is refused outright rather than
approximated by the straight 60 degree cone of forms A and B. Filling any of
these tables later is a data edit with no code change, and a shape test already
fails any row that lands without a column the drawing code reads.
Three deviations from the plan text, each measured rather than assumed
(the merge agent should keep exactly one copy of the first):
1. standards/__init__.py (Task 1, on main) refused a registration with no rows
("registered no rows"), which would have made the four not-transcribed
tables impossible to register at all - and registering them is what keeps a
later transcription a data edit. register() now refuses a rows argument that
is not a dict and accepts an empty one; two tests in tests/test_mech_standards.py
pin both halves. No existing test asserted the old refusal.
2. ORingGroove's housing kind is carried by `housing`, not `kind`. A dataclass
field named `kind` overwrites the discriminator _Base.to_dict() writes:
measured, Probe(id='og').to_dict() == {'kind': 'radial', 'id': 'og'}, so
feature_from_dict would then refuse its own payload as an unknown feature
kind and no part carrying an O-ring groove could round-trip through XDATA.
A new test pins the round trip.
3. The plan's end-chamfer test asserted after == (75.0, 10.0) - the corner
itself - and before == (72.0, 8.268), a point on neither surface. The real
edit is before (72.0, 10.0) on the cylinder and after (75.0, 8.268) on the
end face, consistent with the 45-degree start chamfer the same file pins.
The test was corrected to the measured geometry; the behaviour is unchanged.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FKFStjEFzpGyLq5bMpWxTd
61 lines
2.2 KiB
Python
61 lines
2.2 KiB
Python
"""DIN 471 / DIN 472 retaining-ring groove dimensions.
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SOURCE
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------
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DIN 471:2011-04, *Retaining rings for shafts*, Table 1 (groove diameter d2 and
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groove width m) and DIN 472:2011-04, *Retaining rings for bores*, Table 1.
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COVERAGE
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--------
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**No rows are transcribed in this build**, for the reason given in
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``undercuts.py``: the groove diameter is the number a wrong drawing gets wrong,
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and it is not written here from memory. Every lookup is refused by name.
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Extending is a data edit: fill ``ROWS_471`` / ``ROWS_472`` with
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``{nominal_shaft_or_bore_mm: {"m": groove_width_mm, "d2": groove_diameter_mm}}``
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and widen the coverage. Those two keys are the contract group S's
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``std_feature_draw`` already reads.
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"""
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from __future__ import annotations
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from engineering.mech.standards import Coverage, register
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SOURCE = (
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"DIN 471:2011-04 Table 1 (shafts) and DIN 472:2011-04 Table 1 (bores) "
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"- NOT TRANSCRIBED in this build"
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)
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#: The keys every DIN 471/472 row must carry.
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RING_ROW_KEYS: tuple[str, ...] = ("m", "d2")
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ROWS_471: dict[float, dict] = {}
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ROWS_472: dict[float, dict] = {}
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COVERAGE_471 = Coverage(0.0, 0.0, "mm")
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COVERAGE_472 = Coverage(0.0, 0.0, "mm")
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register("DIN 471", ROWS_471, COVERAGE_471, SOURCE)
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register("DIN 472", ROWS_472, COVERAGE_472, SOURCE)
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_ROWS = {"DIN 471": ROWS_471, "DIN 472": ROWS_472}
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def ring_groove_dims(standard: str, d: float) -> dict:
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"""``{"m": ..., "d2": ...}`` for a nominal size, or a named refusal."""
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key = " ".join(str(standard or "").split()).upper()
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if key not in _ROWS:
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raise ValueError(f"retaining-ring groove: expected DIN 471 or DIN 472, got {standard!r}.")
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rows = _ROWS[key]
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if not rows:
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raise ValueError(
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f"{key}: no rows are transcribed in this build, so no groove can be looked up "
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f"for d = {float(d):g} mm. Pass m and d2 explicitly, or transcribe "
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f"{SOURCE.split(' - ')[0]} into engineering/mech/standards/rings.py. "
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"Nothing is interpolated."
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)
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size = float(d)
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if size in rows:
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return {name: float(rows[size][name]) for name in RING_ROW_KEYS}
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raise ValueError(f"{key}: d = {size:g} mm has no transcribed row (sizes: {sorted(rows)}).")
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