spur gear 3d model

Create a parametric 3D model of a spur gear. Specifications: - Module (m): 1 mm - Number of teeth (z): 45 - Pressure angle: 20 degrees - Face width: 10 mm - Bore diameter: 5 mm Calculate and use standard gear proportions: - Pitch diameter = m × z - Addendum = m - Dedendum = 1.25 × m - Outer diameter = pitch diameter + 2 × m - Root diameter = pitch diameter − 2.5 × m - Base circle diameter = pitch diameter × cos(pressure angle) Tooth profile: - Use an involute curve generated from the base circle - Ensure correct tooth thickness at pitch circle Model requirements: - Fully parametric and editable - Circular pattern for all teeth - Extrude to specified face width