[family] single_row_deep_groove_ball_bearing: ISO 15 6000-series open bearing

[a1423150775-dotcom]

Family

• Family: single_row_deep_groove_ball_bearing — cat:machine-elements / rolling-bearings
• Closes [family-assembly] single_row_deep_groove_ball_bearing #41

Reference (issue #41 — ISO 15 / SKF 6000 open single-row deep groove ball bearing)

Reference drawings, SKF dimension page screenshots, TraceParts 6000 CAD reference views, and the 6000–6005 boundary-dimension table are documented in the family issue: #41.

Generated — benchmark views (what the model sees)

Difficulty overview — easy / medium / hard

Extremes — smallest & largest sampled instances

How it's parameterized

An open single-row deep groove ball bearing with distinct multi-body geometry:

• continuous outer ring with revolved radial-axial profile, OD wall, shoulders, chamfered ends, and a central deep-groove raceway;
• continuous inner ring with revolved radial-axial profile, bore wall, shoulders, chamfered ends, and a central deep-groove raceway;
• one row of equally spaced rolling balls;
• independent upper and lower stamped-cage-style halves with rounded annular bands and open spherical pockets.

designation selects the coupled real catalog row for 6000–6005. The standard boundary dimensions bore_d, outer_d, and width are locked together and are not independently randomized.

For 6000, the internal ball layout is calibrated from the provided TraceParts 6000 reference PNG geometry:

• ball_count = 7
• ball_d ≈ 4.83 mm
• pitch_d ≈ 18.04 mm

For 6001–6005, the real d/D/B boundary dimensions are preserved, but internal ball, pitch, groove, and cage dimensions are explicitly marked as proportion, not SKF/TraceParts internal measurements.

Difficulty separation:

• easy covers 6000–6001 with 7 balls and compact open-bearing proportions;
• medium covers 6002–6003 with 8 balls and larger catalog rows;
• hard covers 6004–6005 with the largest catalog rows and 8–9 ball layouts.

First version scope:

• open bearing only;
• no 2Z/ZZ metal shields;
• no 2RS rubber seals;
• no materials, lubrication, clearance class, or load-rating-only geometry variants.

Notes for review

NOTES.md is included because REVIEWING.md asks equation-heavy / standard-table-derived families to map datasheet symbols to code parameters and formulas. It documents:

• ISO/catalog d, D, B mapping to bore_d, outer_d, width;
• the 6000 PNG circle-fit calculation for ball_d and pitch_d;
• the hand recomputation ball_d = 26 x 228.31 / 1228 ~= 4.83 mm and pitch_d = 2 x 26 x 426.10 / 1228 ~= 18.04 mm;
• shoulder, raceway, and cage derived formulas;
• the source boundary between standard, reference-image calibrated, proportion, and benchmark perturbation values;
• limitations, including that no reliable DWG parser or true CAD section-measurement chain was available locally.

Verification

uv run bench2 validate single_row_deep_groove_ball_bearing --seeds 4 → PASS

Summary from local validation:

• 10 params complete;
• easy/medium/hard each passed 4/4 seeds;
• coverage reaches all 6 designation values and all declared d/D/B table values;
• difficulties produce distinct programs;
• geometry novelty: 12/12 unique shapes;
• solids: every sampled instance non-degenerate, with [11, 12, 13] solids depending on ball count.

Nominal configuration collision / solid checks

designation	balls	total solids	outer	inner	lower cage	upper cage	combined cage	max ball∩inner	max ball∩outer	max ball∩cage	cage∩inner	cage∩outer	cage∩raceway envelopes
6000	7	11	1	1	1	1	2	0	0	0	0	0	0
6001	7	11	1	1	1	1	2	0	0	0	0	0	0
6002	8	12	1	1	1	1	2	0	0	0	0	0	0
6003	8	12	1	1	1	1	2	0	0	0	0	0	0
6004	8	12	1	1	1	1	2	0	0	0	0	0	0
6005	9	13	1	1	1	1	2	0	0	0	0	0	0

The collision checks distinguish non-intended solid overlap from the simplified raceway clearance model. The model keeps a small positive geometric clearance at the rolling contacts rather than simulating elastic contact.

Checklist

• bench2 validate passes locally with --seeds 4 (CI re-runs it)
• all three required renders committed: preview.png, preview_views.png, preview_extremes.png
• NOTES.md documents formulas/source boundaries for equation-heavy review
• real 6000–6005 d/D/B table coupling preserved
• inner/outer rings use complete revolved profiles with shoulders, chamfers, and deep-groove raceways
• cage remains two independent halves, with no closed hoop around the rolling balls
• one family, only designs/single_row_deep_groove_ball_bearing/, body has Closes #41
• DCO-signed; every source/check() cites a real rule or honest proportion — nothing fabricated

Sources used

• ISO 15:2017 — radial rolling bearing boundary-dimension family anchor.
• Provided 6000-series table — real 6000–6005 d/D/B boundary dimensions.
• SKF 6000 open bearing dimension/installation page — 6000 d/D/B, r reference, and shoulder/profile anchors.
• TraceParts SKF 6000 reference PNG views — visual structure and 6000 baseline calibration for ball count / ball diameter / pitch diameter.
• SolidWorks-style section screenshot supplied in review — used as structural topology reference for continuous rings, shoulders, and deep-groove profile only; no editable feature tree or exact fillet/raceway dimensions were available locally.
• proportion — raceway depth/profile, cage dimensions, and internal geometry for 6001–6005 where model-specific ball/groove/cage dimensions were not verified.

Caveats

• ISO 15 defines boundary dimensions, not internal ball, groove, or cage geometry.
• Only 6000 internal ball_count, ball_d, and pitch_d are calibrated from the supplied TraceParts reference PNG views.
• 6001–6005 internal values are proportion estimates and should not be treated as SKF/TraceParts internal measurements.
• Raceway depth/profile is simplified proportion geometry constrained by ring-wall continuity and ball-envelope clearance, not image-derived raceway data.
• Small benchmark perturbations represent dataset variation, not a measurement-error model or product tolerance claim.
• The known 6000 load-rating discrepancy between the provided catalog table and TraceParts/SKF metadata is recorded in the issue but not used as a geometry parameter.
• da, Da, and ra are mounting/abutment recommendations and are not modeled as bearing-body geometry.

[github-actions]

Welcome, and thanks for the family PR! Three things that answer most questions:

• No checks running? A maintainer must click Approve workflows once for your first PR — pending, not ignored.
• Red gate? The message tells you the fix: click Details, or read the bench2 validate report comment posted after each run. Reproduce locally with uv sync && uv run bench2 validate <family> (debug help).
• Scope: designs/<family>/ holds only the package files (reference drawings/photos go in the family issue), and the PR checklist must be fully ticked. Not done yet? Mark the PR as a Draft.

中文:红 ✗ 点 Details 或看 validate 报告评论;本地 uv run bench2 validate <family> 复现;参考图放 issue 不放 PR;没做完用 Draft。入门 → GETTING_STARTED.zh

[github-actions]

bench2 validate

single_row_deep_groove_ball_bearing

  ✓ 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: 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 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
PASS — designs/single_row_deep_groove_ball_bearing

Previews: the previews artifact on this run.

[HaozheZhang6]

please add the render img for each part