cadSet/text-to-cad/skills/cad/references/cad-skillx/functional/bearing-bore-seat.functional.md

Bearing Bore Seat Functional Skill

When to use

• A part must locate a bearing, bushing, sleeve, or shaft using a coaxial bore, counterbore, pocket, shoulder, or retaining seat.
• The requested model is a housing/seat component, bracketed bearing support, bushing support, or bearing retainer.

Do not use when

• The part only has generic decorative holes or a simple washer hole.
• The task is to create a full bearing assembly with rolling elements.
• The central hole is only a screw clearance hole and not a shaft/bearing datum.

Recognition features

• Through bore for shaft clearance.
• Larger coaxial pocket for bearing outside diameter.
• Shoulder or depth stop for axial location.
• Optional retaining groove, cover recess, set-screw hole, lubrication hole, or mounting base.
• Bore entry chamfers for assembly.

Core invariants

• Shaft clearance bore and bearing seat remain coaxial.
• Seat diameter is larger than shaft clearance diameter when a bearing pocket is present.
• Seat depth must be represented; a bearing seat is not just a surface ring.
• Shoulder geometry should remain after the pocket cut.
• Mounting holes must not break into the bearing seat unless explicitly designed.

Parameter roles

• axis defines the bore centerline.
• shaft_clearance_diameter defines the through hole.
• bearing_outer_diameter defines the pocket/seat diameter.
• seat_depth defines bearing insertion depth.
• shoulder_diameter and shoulder_height define axial stop.
• retaining_groove_width and retaining_groove_depth define optional retention.

Construction sequence

1. Create or select the main housing body.
2. Establish a construction axis through the intended shaft centerline.
3. Cut the shaft clearance bore through all relevant material.
4. Cut the bearing seat/counterbore to controlled depth from the assembly side.
5. Preserve or create the shoulder that stops the bearing.
6. Add retaining grooves, set-screw holes, lubrication holes, and mounting holes only after the bore/seat is correct.
7. Apply bore lead-in chamfers and small external fillets last.

Common failures

• Making the seat blind depth ambiguous.
• Losing the shoulder by cutting the same diameter through the whole body.
• Off-axis bearing pocket relative to shaft bore.
• Treating bearing housing as complete bearing assembly.
• Adding mounting holes before the seat and accidentally breaking the pocket wall.

Evidence summary

• Current library evidence: 24 reviewed SCAD58 bearing housing/seat models.
• Latest run evidence: accepted insights for central bore alignment, coaxial cylindrical features, counterbore/seat construction, and bore chamfering.
• Frequent operations in the latest run: Cut, RevCut, Revolution, HoleWzd, Chamfer, Fillet.
• Source: CAD-SkillX offline review of SCAD58 descriptions, STEP summaries, and SolidWorks feature evidence.

Retrieval metadata

Triggers:

• bearing bore seat
• bearing pocket
• bearing seat
• bushing bore
• shaft clearance bore

Secondary triggers:

• coaxial bore
• counterbore
• shoulder
• retaining groove
• bearing housing

Operation triggers:

• cut through bore
• counterbore to depth
• preserve shoulder
• chamfer bore

Exclusions:

• flange only
• plain washer
• decorative circular hole
• complete rolling bearing