[family-assembly] cabinet_bar_pull_handle: cabinet/drawer bar pull

[BenchCAD]

Family

• Family: cabinet_bar_pull_handle — cat:furniture-hardware — multi-body (simple assembly, solids=3)
• Closes [family-assembly] cabinet_bar_pull_handle #26

Reference (issue #26 — Berenson 7068 / Richelieu BP305)

Datasheet drawing	Part photo

Generated — benchmark views (what the model sees)

Three-view + iso — hard example

(the side view shows the post coped around the bar — the two parts meet on a saddle surface, no fused joint)

Extremes — smallest & largest sampled instances

How it's parameterized — multi-body

Per review: the pull is modelled as the three parts it is assembled from — the
round bar and two standoff posts as separate solids in one compound. Each post
rises to the bar axis and is coped by the bar cylinder, so it seats flush on
the bar's underside in contact only (zero interpenetration); each post is tapped
from the base for the mounting screw. family.json declares "solids": 3, so
bench2 validate fails if a member vanishes or merges. 8 params, one feature
(chamfer_ends). C-C is the catalog ladder (76-638 mm); bar Ø / post Ø /
projection are constant within one line, so they're proportion.

Verification (every sampled instance — three separate solids, zero pairwise intersection)

difficulty	center_to_center	overhang	projection	bar_d	post_d	tap_d	solids	max pair overlap (mm³)	bbox (mm)
easy s0	157.15	28.32	32.12	11.03	10.63	3.57	3	0.00	214×11×32
medium s0	231.42	28.09	28.41	10.1	11.25	4.37	3	0.00	288×11×28
hard s0	433.97	29.33	25.7	9.12	11.88	4.78	3	0.00	493×12×26
hard s1	363.64	57.92	27.45	15.64	8.87	3.56	3	0.00	479×16×27
hard s2	223.03	30.54	38.84	9.64	10.6	4.32	3	0.00	284×11×39

bench2 validate cabinet_bar_pull_handle → PASS, including
solids: every instance non-degenerate, 3 solid(s) each (declares solids=3).
Pairwise intersection volumes measured directly (OCC common op) on both chamfer
variants — all 0.00 mm³.

Checklist

• bench2 validate passes locally (CI re-runs it)
• multi-body: family.json declares "solids": 3; members are contact-only (coped seat, no fusion)
• all four renders regenerated at this head, including preview_hard_zoom.png ([framework] bench2 preview emits preview_hard_zoom (three-view+iso) + CI gate (warns first) #18 standard)
• one family, only designs/cabinet_bar_pull_handle/ (package files only — refs stay in the issue)
• body has Closes #26; DCO-signed; sources cited, nothing fabricated

Sources used

• Berenson SS bar-pull series 7068-7072 (dimensioned line drawing: bar Ø12, post Ø10, projection 32.5, C-C 128-384, M4 tap).
• Richelieu BP305 per-SKU drawings (C-C 76-638, overall = C-C+80, 8-32x6 tap); bar/post/projection cross-checked constant across Amerock + Hickory.

[github-actions]

bench2 validate

cabinet_bar_pull_handle

  ✓ family.json: keys + base_plane valid
  ✓ pieces: build(8 params) + PARAM_SPEC + check present
  ✓ PARAM_SPEC: 8 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, 3 solid(s) each (declares solids=3)
PASS — designs/cabinet_bar_pull_handle

Previews: the previews artifact on this run.

[HaozheZhang6]

should change to assembly as a simple assembly example

[BenchCAD]

Done — reworked as a simple assembly: the bar and the two standoff posts are now three separate solids in one compound (family.json declares solids: 3, validate gates the count). Each post is coped by the bar cylinder so it seats on the bar in contact only; pairwise intersection volumes measure 0.00 mm³ on both chamfer variants. Renders regenerated at the new head (now including preview_hard_zoom.png), body table refreshed, and the PR + issue #26 retitled [family-assembly] per the #53/#54 convention.

[BenchCAD]

Closing per maintainer call: even as an assembly this family is too simple to earn a slot — three coped primitives on one axis. Dropping it (issue #26 closed as not planned, branch deleted).