Sensor Watch Clasp Housing

Create a parametric 3D B-Rep model of a central butterfly watch clasp housing designed to hold a smart sensor. Execute the following geometric steps sequentially: Step 1: Main Body Create a central rectangular block with heavily filleted (rounded) outer corners. The total outer bounding dimensions must be 35.5mm long, 16.36mm wide, and 1.8mm high. Step 2: Internal Cavity (Boolean Subtraction) Cut an inner cavity from the top face down. The subtracted volume must measure exactly 33.5mm long by 14.36mm wide. Do not cut all the way through; leave exactly a 0.5mm thick solid plate at the bottom. This leaves outer walls that are precisely 1.0mm thick. Step 3: Sensor Window (Boolean Subtraction) Create a cutout for skin contact by boolean subtracting a centered rectangle measuring exactly 32.76mm long by 13.77mm wide completely through the remaining 0.5mm bottom plate. Step 4: Fingernail Extraction Chamfer At the top edge of one of the short outer walls (the 16.36mm side), cut a semi-cylindrical recessed notch that is 8.0mm wide and 1.5mm deep to act as a fingernail catch for hot-swapping. Step 5: Retention Groove Cut a 0.5mm deep horizontal micro-groove spanning the inner vertical walls of the cavity to house a friction liner. Step 6: Spring Bar Lugs Extend two standard watch lug horns from both ends of the main body. The inner distance between the opposing lug horns must be exactly 18mm. Apply a 1.0mm diameter cylindrical hole into the inner face of each lug horn to accommodate standard watch spring bars. Step 7: Ergonomic Curvature Apply a 5-degree downward radial bend to the extending lug horns so the final part conforms to the natural curvature of a wrist.

Parameters

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.