3in Square Cross-Island Milled Plate

Create a 3D CAD model of a machined aluminum part with an overall finished size of 3.00 inches × 3.00 inches × 1.00 inch. Use the center of the top face as the X-Y origin. The part is a square block with four-way symmetry. On the top face, machine a large circular recessed slot/pocket centered on the origin. The circular feature is made using a 1/4-inch diameter end mill, so the slot width must be 0.250 inches. The circular slot follows a constant-radius circular toolpath and remains concentric with the center of the part. Inside the large circular feature, create a four-arm cross-shaped central feature. The four arms are oriented along the +X, -X, +Y, and -Y axes. The feature is symmetric about both the X and Y axes, with rounded outer ends. Create four circular holes, one positioned near the outer end of each arm of the central cross. The four holes must be equally spaced at 90-degree intervals around the center and must have identical diameters. Maintain the 3.00 × 3.00-inch square footprint and 1.00-inch overall thickness. All features on the top surface must be centered and symmetrical about the origin. Model the geometry as a machinable solid suitable for CNC milling with a 1/4-inch end mill. Do not add decorative features or geometry that is not described. Use inch units. The exact dimensions of the circular slot, cross feature, holes, and feature depths will be provided separately and must be treated as driving dimensions rather than guessed dimensions.

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.