GEAR_56T_DP8_20DEG

Create a precise 3D CAD model of a standard external spur gear for mechanical engineering design and manufacturing. ### Gear Specifications * Gear Type: External Spur Gear * Number of Teeth: 56 * Diametral Pitch: 8 teeth/in * Pressure Angle: 20° * Tooth Profile: Standard 20° Full-Depth Involute * Face Width: 1.500 in * Pitch Diameter: 7.000 in * Outside Diameter: 7.250 in * Root Diameter: 6.6875 in * Base Circle Diameter: 6.5778 in * Addendum: 0.125 in * Dedendum: 0.15625 in * Circular Tooth Thickness at Pitch Circle: 0.19635 in * Recommended Bore Diameter: 1.250 in ### Bore and Keyway Create a centered through-bore: * Bore Diameter: 1.250 in Create a standard straight keyway in the bore: * Keyway Width: 0.250 in * Keyway Depth: 0.125 in * Keyway must extend through the complete face width. ### Geometry Requirements * Generate all 56 teeth using a mathematically accurate involute tooth profile. * Use a true 20° involute generated from the base circle. * Do NOT use simplified rectangular, triangular, or polygonal teeth. * Maintain equal tooth spacing around the complete circumference. * The tooth thickness at the pitch circle must be 0.19635 in. * The gear must be a single clean solid body. * Face width must be exactly 1.500 in. * Bore must be concentric with the gear axis. * Keyway must be centered and properly aligned with the bore. * Avoid self-intersections, invalid surfaces, gaps, or non-manifold geometry. ### Engineering Verification The generated model must satisfy: Pitch Diameter: 7.000 in Outside Diameter: 7.250 in Root Diameter: 6.6875 in Base Diameter: 6.5778 in Center bore: 1.250 in Face width: 1.500 in ### CAD Output Create a clean parametric/manufacturing-ready 3D solid model. The model should be suitable for: * PTC Creo Parametric 12.4 * SolidWorks 2025 * Autodesk Inventor * Fusion 360 Export the final model as STEP (.STEP or .STP) with accurate dimensions and geometry. Name the model: GEAR_56T_DP8_20DEG

Parameters

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