Spur Pinion 12T m=1.4286 TT-Motor Shaft

Create a precise parametric 3D CAD model of an external spur pinion gear for a rotating platform mechanism. PURPOSE: The pinion drives an internal ring gear in a rotating platform mechanism. The pinion must mesh correctly with the internal ring gear. GEAR SPECIFICATIONS: - Gear type: External spur gear. - Number of teeth: Exactly 12. - Standard involute tooth profile. - Pressure angle: 20 degrees. - Calculate the module based on compatibility with the internal ring gear. - Target module: approximately 1.4286 mm. - Target outside diameter: approximately 20 mm. - Calculate all pitch, root, and outside diameters mathematically. - Gear thickness: 10 mm. - Straight, evenly spaced teeth. - Use a standard metric involute gear profile. INTERNAL RING GEAR COMPATIBILITY: - Internal ring gear outside diameter: 180 mm. - Internal tooth tip diameter: 160 mm. - Internal ring gear thickness: 10 mm. - Internal ring gear tooth count: approximately 114 teeth. - Both gears must use the same module and pressure angle. - Calculate the correct tooth geometry and center distance for internal meshing. - Verify that the pinion and ring gear are mathematically compatible. - Do not force incompatible dimensions. - Prioritize correct mechanical meshing over maintaining an exact 20 mm pinion diameter. MOTOR SHAFT BORE: - Designed for a standard TT gear motor double-flat shaft. - Shaft external diameter: 5.3 mm. - Distance between opposite parallel flat faces: 3.6 mm. - Create a central bore with two opposite parallel flat sides. - Bore must pass completely through the 10 mm gear thickness. - Use approximately 0.2 mm clearance for FDM 3D printing. - Target bore circular diameter: 5.5 mm. - Target flat-to-flat distance: 3.8 mm. - Keep the bore centered on the gear axis. - Ensure a secure mechanical fit and prevent rotational slipping. CENTRAL HUB: - Include a reinforced central hub around the motor shaft bore. - Maintain sufficient material thickness between the bore and tooth roots. - Create one single solid part. - Ensure concentricity between the bore and the gear teeth. 3D PRINTING REQUIREMENTS: - Optimize for FDM 3D printing. - Include appropriate backlash for printed gears. - Avoid self-intersecting geometry. - Ensure all teeth are solid and properly connected. - Use millimeters as the unit. - All dimensions must be parametric and editable. - Generate a valid solid CAD model. - Exportable as STL. VALIDATION: - Verify the involute tooth profile. - Verify the module and pitch diameters. - Verify internal gear compatibility. - Verify the motor shaft bore dimensions. - Ensure the final model is suitable for functional rotation and torque transmission.

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.