Enclosures and housings
2-Piece Watch Case (Mid-case + Case Back)
- Bounding box
- 38.0 × 44.5 × 5.2 mm
- Engine
- Precision B-rep
- Parameters
- 20
- Published
- November 2, 2026
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The prompt
Create a 3D CAD model (.step / .stp format) of a 2-piece watch case (Mid-case + Snap-on Case Back) ready for 5-axis CNC machining. Material & Finish Intent (For reference): 316L Stainless Steel, fully polished, with Rose Gold PVD coating. (Note: Snap-fit lip must be dimensioned to allow for masking during PVD). Base Architecture: Movement: ETA 7001 (H3 Pinion upgrade) Dial: 1.00 mm thick Minankari (Enamel) Total Height Target: 4.50 mm (metal only, excluding domed crystal) Critical Dimensions (Refer to attached 2D SVG): Outer Diameter: 38.00 mm Lug Width (Strap): 22.00 mm Lug-to-Lug Distance: ~44.50 mm (Lugs should curve downward for wrist comfort) Upper Crystal Rebate: Ø 33.80 mm (+0.02/-0.00) x 1.20 mm deep Dial Aperture: Ø 33.00 mm Movement Pocket: Ø 23.50 mm x 2.50 mm deep Crown Tube Bore: Ø 2.00 mm H7, with the central axis located exactly 1.25 mm below the dial seating flange (Datum A). Case Back Fitting: Solid 0.80 mm thick snap-on case back. Require an interference snap-fit lip (Ø 32.50 mm) with a small pry-notch at the 9 o'clock position for case knife access. Deliverables Required: .stp / .step file of the Mid-case assembly. .stp / .step file of the Case Back.
Parameters
| Name | Value | Range |
|---|---|---|
| Part (0=Mid-case, 1=Case Back) | 0 | 0 – 1 |
| Total Metal Height | 4.5 mm | 3.5 – 6 |
| Case Back Thickness | 0.8 mm | 0.5 – 2 |
| Outer Diameter | 38 mm | 30 – 50 |
| Lug-to-Lug Distance | 44.5 mm | 38 – 55 |
| Lug Gap (Strap Width) | 22 mm | 16 – 30 |
| Lug Arm Width | 8 mm | 3 – 12 |
| Lug Downward Droop | 1.5 mm | 0 – 4 |
| Crystal Rebate Diameter | 33.8 mm | 30 – 36 |
| Crystal Rebate Depth | 1.2 mm | 0.5 – 2.5 |
| Dial Aperture Diameter | 33 mm | 29 – 35 |
| Dial Aperture Depth | 1 mm | 0.5 – 2 |
| Movement Pocket Diameter | 23.5 mm | 18 – 30 |
| Movement Pocket Depth | 2.5 mm | 1.5 – 3.5 |
| Crown Tube Bore Diameter | 2 mm | 1.5 – 3 |
| Crown Axis Below Dial Seating Flange | 1.25 mm | 0.5 – 2 |
| Snap-Fit Lip Diameter | 32.5 mm | 28 – 36 |
| Snap Lip Recess Depth | 0.5 mm | 0.2 – 1.5 |
| Pry Notch Width | 6 mm | 2 – 10 |
| Pry Notch Depth | 1 mm | 0.3 – 3 |
Every value above is a live dimension. Open a model like this in the editor and each one becomes a slider you can drag before exporting.
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