# Threaded Hole Creation Atomic Skill

## When to use

- A part needs an internal thread, tapped hole, threaded mounting hole, or screw hole with a specified metric/imperial size.
- The request mentions M3, M4, M5, M6, M8, M10, tapped hole, threaded hole, or thread depth.

## Do not use when

- The feature is an external thread on a bolt, screw, or shaft.
- The hole is only a smooth clearance hole.
- The model should avoid thread geometry and only show a simple bore unless the prompt asks for thread detail.

## Recognition features

- SolidWorks evidence such as HoleWzd threaded hole or thread parameters.
- Descriptions mention fastening, tapped holes, internal thread, or screw mounting.
- Hole is located on a planar face, boss face, or shaft end face.

## Core invariants

- Use a standard threaded hole feature or thread callout when available.
- Keep the threaded hole axis normal to the placement face unless angled threading is requested.
- Separate tap drill diameter, nominal thread size, hole depth, and thread depth.
- Keep enough wall material around the threaded hole.
- Add lead-in chamfer after the thread/hole is placed.

## Parameter roles

- `thread_size` defines nominal size such as M3/M4/M5/M6/M8/M10.
- `thread_pitch` defines fine/coarse pitch when specified.
- `thread_depth` defines threaded length.
- `hole_depth` defines blind hole depth if not through.
- `placement_point` and `face_normal` define location and direction.
- `lead_in_chamfer` defines assembly entry.

## Construction sequence

1. Select the planar face or end face for the threaded hole.
2. Place the hole center from datums, centerlines, or axis references.
3. Create the hole using a threaded HoleWzd/hole feature with size and depth.
4. If the backend cannot model threads, create the correct pilot bore and preserve thread intent in naming/comments.
5. Pattern or mirror the threaded hole feature when repeated.
6. Add a small lead-in chamfer after the threaded feature is stable.

## Common failures

- Modeling a threaded hole as a plain through cylinder.
- Creating external thread geometry on an internal hole.
- Placing threaded holes too close to edges, slots, or pockets.
- Forgetting blind depth or thread depth.
- Adding visual helical threads that make the model heavy or fragile when a callout is enough.

## Evidence summary

- Latest run evidence: 87 accepted atomic insights matched threaded/tapped hole creation.
- Strong repeated names include `create_threaded_hole_with_hole_wizard`, `create_threaded_hole`, `threaded_hole_placement`, and `use_hole_wizard_for_threaded_holes`.
- Frequent operations in the latest run: HoleWzd, Cut, RevCut, Chamfer, Pattern.
- Source model examples: 000924, 011524, 017151, 047238, 077661, 080683, 095520, 105855, 145389, 160434, 174675, 200790, 206894, 211326, 225767.
- Source: CAD-SkillX offline review of SCAD58 descriptions, STEP summaries, and SolidWorks feature evidence.

## Retrieval metadata

Triggers:
- `threaded hole`
- `tapped hole`
- `internal thread`
- `M3`
- `M4`
- `M5`
- `M6`
- `M8`
- `M10`

Secondary triggers:
- `thread depth`
- `tap drill`
- `screw mounting`
- `threaded boss`
- `end threaded hole`

Operation triggers:
- `hole wizard threaded hole`
- `create tapped hole`
- `add thread callout`
- `lead in chamfer`

Exclusions:
- `external thread`
- `bolt`
- `screw`
- `clearance hole only`
- `decorative helix`