[BenchCAD]

Supersedes #208, keeping its author: this branch is #208's commits by @jiashunwu1030 plus two maintainer commits. The contributor's fork does not accept maintainer pushes, so the fix lands here.

What changed: build() returned the eight bodies as one cq.Compound with only "solids": 8 in family.json, which the task4 pipeline cannot use. Now family.json declares components (casing 1, sleeve 1, anchoring_ring 2, d_bar_left 1, d_bar_right 1, lock_bolt 2) and build() returns a named cq.Assembly, with repeats named <component>_NN. The geometry and placement of every body are unchanged. preview_parts.png is regenerated for the named components. The two D bars are a left/right mirror pair (the bolt bores run along Y, oblique to each bar's ±105° cant; reflection in XZ matches exactly, no rotation does), so they are two components. bench2 validate: PASS (5 component types summing to solids=8; all 12 seeds build).

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Family

• Family: straub_grip_axial_restraint_pipe_coupling - family-assembly
• Closes [family-assembly] straub_grip_axial_restraint_pipe_coupling #207
• An eight-body Dixon / STRAUB GRIP-L axial-restraint pipe coupling with a hollow rolled casing, EPDM sealing sleeve, two anchoring rings, two hollow D-section closure bars, and two transverse lock bolts.

Reference - official manufacturer images (from Family Issue #207)

Official product photograph	Official orthographic / section drawing

Generated - benchmark views (what the model sees)

Generated - easy / medium / hard samples

Easy samples are the top row, medium samples the middle row, and hard samples the bottom row.

Extremes - smallest & largest sampled instances

Modeled component instances - medium seed 0

catalog_index 1 - STR20900. The panel separates all eight actual CadQuery bodies: casing, EPDM sleeve, left/right anchoring rings, left/right D-section closure bars, and two transverse lock bolts.

Schematic exploded view

Schematic exploded view of the eight modeled bodies; not an authoritative manufacturer assembly procedure.

How it is parameterized

• catalog_index maps strictly to one complete Dixon catalog row (0-3); dimensions are not freely recombined.
• fitted_pipe_od is refined within the selected row's published min/max pipe O.D. range.
• Every sampled instance contains the same eight non-degenerate solids.

Verification (every sampled instance - eight non-degenerate solids)

catalog_index	designation	nominal size	pipe O.D.	published O.D. range	working pressure	B	C	DV	R	solids
0	STR20650	3 in	3.50 in	3.46-3.54 in	377 PSI	3.9 in	1.5 in	4.4 in	0.2 in	8
1	STR20900	4 in	4.50 in	4.46-4.54 in	319 PSI	3.9 in	1.5 in	5.5 in	0.4 in	8
2	STR21350	6 in	6.63 in	6.56-6.69 in	232 PSI	4.5 in	2.1 in	7.6 in	0.4 in	8
3	STR21400	8 in	8.63 in	8.54-8.71 in	232 PSI	5.6 in	3.1 in	9.8 in	0.4 in	8

bench2 validate straub_grip_axial_restraint_pipe_coupling ? PASS.

• Catalog coverage: 4/4
• Unique sampled shapes: 12/12
• Solid count: 8 for every sampled instance

Modeling simplifications and constraints

• Published B, C, DV, R, pipe O.D. values and min/max ranges are mapped directly from Dixon DPL424 p.965.
• Individual sheet thicknesses, seal-lip profile, stamped-tooth pitch, D-bar cross-section, bolt-head detail, local pressed bolt-clearance windows, and thread forms are honest proportion-based simplifications because the sources do not dimension them.
• The casing, sleeve and two anchoring rings retain a genuine continuous central bore; connected pipes are not product bodies and are omitted.
• The optional strip insert and hidden internal details are not modeled.

Checklist

• Local validation passes.
• preview.png, preview_views.png, and preview_extremes.png were generated and manually checked.
• family.json declares solids: 8; every body is non-degenerate.
• The four catalog rows remain complete sourced combinations.
• PR touches only designs/straub_grip_axial_restraint_pipe_coupling/ and contains the seven required assembly files.
• Extra component and exploded images are GitHub user attachments, not repository files.
• Commit is DCO-signed.
• AI-assisted; contributor manually reviewed the model, constraints, and previews.

Sources used

• Dixon DPL424 catalogue, p.965
• STRAUB GRIP-L datasheet
• STRAUB fitting instruction ST00152_0820

[github-actions]

bench2 validate

clevis_fork_head

  ✓ 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
  ✓ coverage: d1 reaches all 8 declared values (standard table fully covered)
  ✓ coverage: is_long reaches all 2 declared values (standard table fully covered)
  ✓ difficulty separation: difficulties produce distinct programs
  ✓ geometry novelty: 9/12 unique shapes (25% duplicate)
  ✓ solids: every instance non-degenerate, 1 solid(s) each
PASS — designs/clevis_fork_head

gn866_pneumatic_power_clamp

  ✓ family.json: keys + base_plane valid
  ✓ family.json components: 3 component type(s), quantities sum to solids=3
  ✓ pieces: build(29 params) + PARAM_SPEC + check present
  ✓ PARAM_SPEC: 29 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
  ✓ coverage: size reaches all 3 declared values (standard table fully covered)
  ✓ difficulty separation: difficulties produce distinct programs
  ✓ geometry novelty: 8/12 unique shapes (33% duplicate)
  ✓ solids: every instance non-degenerate, 3 solid(s) each (declares solids=3)
PASS — designs/gn866_pneumatic_power_clamp

metric_plastic_cable_gland

  ✓ 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
  ✓ coverage: size_index reaches all 8 declared values (standard table fully covered)
  ✓ difficulty separation: difficulties produce distinct programs
  ✓ geometry novelty: 8/12 unique shapes (33% duplicate)
  ✓ solids: every instance non-degenerate, 1 solid(s) each
PASS — designs/metric_plastic_cable_gland

minifix_cam_housing

  ✓ family.json: keys + base_plane valid
  ✓ pieces: build(9 params) + PARAM_SPEC + check present
  ✓ PARAM_SPEC: 12 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
  ✓ coverage: variant reaches all 8 declared values (standard table fully covered)
  ✓ coverage: min_wood_thickness reaches all 8 declared values (standard table fully covered)
  ✓ coverage: housing_height reaches all 8 declared values (standard table fully covered)
  ✓ coverage: bolt_axis_height reaches all 8 declared values (standard table fully covered)
  ✓ coverage: has_rim reaches all 2 declared values (standard table fully covered)
  ✓ coverage: has_markings reaches all 2 declared values (standard table fully covered)
  ✓ 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/minifix_cam_housing

set_screw_shaft_collar

  ✓ family.json: keys + base_plane valid
  ✓ pieces: build(6 params) + PARAM_SPEC + check present
  ✓ PARAM_SPEC: 6 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
  ✓ coverage: bore_d reaches all 15 declared values (standard table fully covered)
  ✓ difficulty separation: difficulties produce distinct programs
  ✓ geometry novelty: 7/12 unique shapes (42% duplicate)
  ✓ solids: every instance non-degenerate, 1 solid(s) each
PASS — designs/set_screw_shaft_collar

single_friction_bearing_universal_joint

  ✓ family.json: keys + base_plane valid
  ✓ family.json components: 5 component type(s), quantities sum to solids=5
  ✓ pieces: build(11 params) + PARAM_SPEC + check present
  ✓ PARAM_SPEC: 11 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: 9/12 unique shapes (25% duplicate)
  ✓ solids: every instance non-degenerate, 5 solid(s) each (declares solids=5)
PASS — designs/single_friction_bearing_universal_joint

single_row_deep_groove_ball_bearing

  ✓ family.json: keys + base_plane valid
  ✓ family.json components: 5 component type(s), param-valued quantities (ball_count) resolve per instance
  ✓ 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
  ✓ coverage: designation reaches all 6 declared values (standard table fully covered)
  ✓ coverage: bore_d reaches all 6 declared values (standard table fully covered)
  ✓ coverage: outer_d reaches all 6 declared values (standard table fully covered)
  ✓ coverage: width_B reaches all 4 declared values (standard table fully covered)
  ✓ difficulty separation: difficulties produce distinct programs
  ✓ geometry novelty: 12/12 unique shapes (0% duplicate)
  ✓ solids: every instance non-degenerate, [11, 12, 13] solid(s) each (components quantities resolved per instance)
PASS — designs/single_row_deep_groove_ball_bearing

slotted_din_rail

  ✓ family.json: keys + base_plane valid
  ✓ pieces: build(10 params) + PARAM_SPEC + check present
  ✓ PARAM_SPEC: 11 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: 6/12 unique shapes (50% duplicate)
  ✓ solids: every instance non-degenerate, 1 solid(s) each
PASS — designs/slotted_din_rail

speaker_pole_mount_socket

  ✓ 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
  ✓ coverage: bore_d reaches all 2 declared values (standard table fully covered)
  ✓ coverage: flange_od reaches all 2 declared values (standard table fully covered)
  ✓ coverage: flange_t reaches all 2 declared values (standard table fully covered)
  ✓ coverage: depth reaches all 6 declared values (standard table fully covered)
  ✓ difficulty separation: difficulties produce distinct programs
  ✓ geometry novelty: 9/12 unique shapes (25% duplicate)
  ✓ solids: every instance non-degenerate, 1 solid(s) each
PASS — designs/speaker_pole_mount_socket

stop_bar_tailpiece

  ✓ family.json: keys + base_plane valid
  ✓ pieces: build(11 params) + PARAM_SPEC + check present
  ✓ PARAM_SPEC: 11 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/stop_bar_tailpiece

straub_grip_axial_restraint_pipe_coupling

  ✓ family.json: keys + base_plane valid
  ✓ family.json components: 6 component type(s), quantities sum to solids=8
  ✓ pieces: build(2 params) + PARAM_SPEC + check present
  ✓ PARAM_SPEC: 2 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
  ✓ coverage: catalog_index reaches all 4 declared values (standard table fully covered)
  ✓ difficulty separation: difficulties produce distinct programs
  ✓ geometry novelty: 12/12 unique shapes (0% duplicate)
  ✓ solids: every instance non-degenerate, 8 solid(s) each (declares solids=8)
PASS — designs/straub_grip_axial_restraint_pipe_coupling

t_handle_ball_lock_pin

  ✓ family.json: keys + base_plane valid
  ✓ family.json components: 4 component type(s), quantities sum to solids=5
  ✓ pieces: build(9 params) + PARAM_SPEC + check present
  ✓ PARAM_SPEC: 9 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
  ✓ coverage: catalog_index reaches all 30 declared values (standard table fully covered)
  ✓ difficulty separation: difficulties produce distinct programs
  ✓ geometry novelty: 6/12 unique shapes (50% duplicate)
  ✓ solids: every instance non-degenerate, 5 solid(s) each (declares solids=5)
PASS — designs/t_handle_ball_lock_pin

three_jaw_scroll_chuck

  ✓ family.json: keys + base_plane valid
  ✓ family.json components: 7 component type(s), quantities sum to solids=9
  ✓ pieces: build(24 params) + PARAM_SPEC + check present
  ✓ PARAM_SPEC: 24 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
  ✓ coverage: catalog_index reaches all 12 declared values (standard table fully covered)
  ✓ difficulty separation: difficulties produce distinct programs
  ✓ geometry novelty: 12/12 unique shapes (0% duplicate)
  ✓ solids: every instance non-degenerate, 9 solid(s) each (declares solids=9)
PASS — designs/three_jaw_scroll_chuck

Previews: the previews artifact on this run.