Watch Case Assembly (Mid-Case, Bezel, Caseback)

Create a 3-part mechanical assembly for a watch case consisting of a Mid-Case, a Bezel, and a Caseback, keeping all three components as separate, non-merging solid bodies aligned along a shared vertical central Z-axis. First, model the Mid-Case centered at Z=0.00: The main body is a cylinder with a 36.00 mm outer diameter and a height of 7.70 mm. Add integrated lugs creating an overall lug-to-lug length of 43.80 mm, with a flat vertical strap gap measuring exactly 19.00 mm wide between the lugs. Apply a 2.50 mm fillet to the outer lug edges. Cut a blind movement pocket from the bottom face that is 29.55 mm in diameter and extends 6.50 mm deep. On the top outer rim, turn down a stepped collar measuring 31.50 mm outer diameter and 1.20 mm high. From the bottom face, cut a internal bore measuring 30.00 mm diameter and 2.00 mm deep. Cut a circular gasket groove on the flat bottom face measuring 0.80 mm wide and 0.55 mm deep. Drill a 2.50 mm crown hole at the 90.0 degree axis, a 1.75 mm pusher hole at the 57.5 degree axis, and a 1.75 mm pusher hole at the 122.5 degree axis, aligning all three side holes exactly 3.12 mm below the upper dial seat lip inside the case. Drill a 1.25 mm spring bar through-hole completely through both sets of lug flanks. Second, model the Bezel as a separate solid body, shifted vertically upward to center at Z=4.55 mm: The ring has a 36.00 mm outer diameter and a total height of 1.40 mm. Apply a smooth 1.60 mm chamfer incline to the top outer edge. Cut a central internal through-hole window with an inner diameter of 30.60 mm. From the bottom face of the ring, cut a circular press-fit pocket recess measuring 31.48 mm in diameter and 1.20 mm deep. Third, model the Caseback as a separate solid body, shifted vertically downward to center at Z=-4.60 mm: The base component is a solid circular disc measuring 31.00 mm in diameter and 1.50 mm thick. Apply a smooth 2.00 mm fillet to the bottom outer edge to create a rounded external dome profile. On the flat upper face of this disc, extrude a cylindrical plug measuring 30.00 mm in diameter and extending upward by 2.00 mm. Around the outer perimeter of the base disc, cut a corrugated pattern consisting of 60 identical vertical flutes spaced evenly around the circumference.

Parameters

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