[family] tilting_speaker_wall_bracket: tilt-adjustable speaker wall mount

[BenchCAD]

Family

• Family: tilting_speaker_wall_bracket — cat:av-rigging
• Closes [family] tilting_speaker_wall_bracket #7

Reference (issue #7 — B-Tech BT77 Ultragrip Pro)

Datasheet drawing	Part photo

Generated — benchmark views (what the model sees)

Three-view + iso — hard example

Extremes — smallest & largest sampled instances

How it's parameterized

A tilt-adjustable speaker wall mount: wall plate (bolt pattern) + standoff arm +
tilt-pivot knuckle + speaker-side plate held at a set tilt angle (with fixing
holes), plus an optional arm gusset. 10 params, one feature (gusset). Shown at
a fixed tilt; the pivot knuckle keeps it one connected body at any tilt.

Verification (every sampled instance — one non-degenerate solid)

difficulty	wall_w	wall_h	plate_t	arm_len	arm_w	tilt_angle	solids	valid	bbox (mm)
easy s0	69.55	133.21	3.08	73.04	28.13	9.13	1	yes	92×98×138
medium s0	75.48	121.58	3.12	74.12	35.89	13.69	1	yes	97×109×145
hard s0	81.12	109.45	2.68	75.6	39.4	18.26	1	yes	107×117×149
hard s1	74.61	193.86	3.15	278.81	24.35	8.47	1	yes	295×141×194
hard s2	61.6	113.01	6.16	92.04	33.0	14.57	1	yes	116×71×113

bench2 validate tilting_speaker_wall_bracket --seeds 5 → PASS (10 params, difficulties distinct, 15/15 unique shapes).

Checklist

• bench2 validate passes locally (CI re-runs it)
• all four renders committed; matches the BT77 across tiers + extremes
• one family, only designs/tilting_speaker_wall_bracket/, body has Closes #7
• DCO-signed; sources cited, nothing fabricated

Sources used

• B-Tech BT77 (Ultragrip Pro) spec sheet — wall-plate holes Ø6.5/8.5 mm at 76/127/145 mm spacing; arm reach 135-280 mm; tilt ±10°.
• BT1/BT15/BT332 line — reach 72-290 mm, tilt ±10 to ±20°, loads 5-25 kg.

Note: modelled as one connected bracket at a set tilt; the clamp jaws, swivel,
and the ball-and-socket detail of the pivot are simplified to a knuckle.

[github-actions]

bench2 validate

tilting_speaker_wall_bracket

  ✓ family.json: keys + base_plane valid
  ✓ pieces: build(10 params) + PARAM_SPEC + check present
  ✓ PARAM_SPEC: 10 params, all entries complete
  ✓ easy: 4/4 seeds sample+check+build+execute clean
  ✓ medium: 4/4 seeds sample+check+build+execute clean
  ✓ hard: 4/4 seeds sample+check+build+execute clean
  ✓ difficulty separation: difficulties produce distinct programs
  ✓ geometry novelty: 12/12 unique shapes (0% duplicate)
  ✓ solids: every instance non-degenerate, 1 solid(s) each
PASS — designs/tilting_speaker_wall_bracket

Previews: see the previews artifact on this run.

[HaozheZhang6]

Validate passes; dimensions anchored to the B-Tech BT-series (reach 72–290 mm, wall holes Ø6.5/8.5, tilt ≤20°). The build reads correctly across tiers: wall plate + 4-hole pattern, standoff arm, a pivot hub that keeps the tilted speaker plate connected as one body, the optional gusset, and the tilt baked at the sampled angle. Modelling the speaker side as a flat plate rather than the BT77's two clamp hooks is a fair abstraction.

Minor, non-blocking: the pivot hub sits offset to +Y of the arm centreline rather than centred on it, and the arm is a plain square bar. I checked the tilt geometry and the plate↔hub connectivity; I did not pin the wall-hole spacings to the exact BT77 76/127/145 pattern — they're sampled proportions here, not the catalog values.