Watch Case and Caseback

# Watch Case and Caseback CAD Description ## Main Case Design a round watch case with a 38 mm diameter and 45.5 mm lug-to-lug length. It should have a smooth, slightly raised circular bezel with gently curved edges. Include four integrated, tapered lugs that curve downwards towards the wrist. The distance between the inner faces of the lugs must be 20 mm. Use blind spring-bar holes drilled from the inside-facing surfaces of the lugs. These holes must not pass through the outside surfaces, which should remain completely smooth. At the 3 o'clock position, include an approximately 3.65 mm plain hole for the crown tube, left untapped for an M4 × 0.35 thread to be added later. The front should have a recessed seat for a flat 32 mm diameter, 1.5 mm thick sapphire crystal, including suitable retaining and gasket arrangements. Do not include the crystal. The interior must accommodate a Miyota 9039 movement, dial and hands, with sufficient clearance and a removable movement mounting arrangement. The underside must have an internal M34 × 0.75 thread for the separate caseback. ## Separate Caseback Design a circular screw-down caseback approximately 36 mm in diameter and 2.8–3.0 mm thick, with a matching external M34 × 0.75 thread. Include a central recessed seat for a 25.8 mm diameter, 1.2 mm thick sapphire exhibition crystal, with suitable retention and sealing. Do not include the crystal. Add a gasket groove and four evenly spaced tool notches around the outside edge. All dimensions, threads, crystal seats and clearances must be checked and finalised together to ensure both components fit correctly.

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