worm gear 3d model

Create a fully parametric 3D worm gear assembly, dimensions in mm. WORM WHEEL: 48 teeth, module m=2, pressure angle 20°, pitch Ø96, outside Ø100, root Ø91, width 18, hub Ø30 x 22, central through bore Ø12. Use 4 curved spokes at 90° with large openings, like the reference image. WORM: single-start, m=2, q=10, pitch Ø20, outside Ø24, root Ø15, threaded length 50, total shaft length 75. Axial pitch=6.283, lead=6.283, lead angle=5.71°. Center distance exactly 58 mm. Gear ratio 48:1. Model real helical worm teeth and real worm-wheel teeth, not cosmetic threads. Add 0.15 mm backlash for 3D printing. Keep all geometry concentric, symmetric, closed and manufacturable. Worm axis perpendicular to wheel axis. Expose Z1,Z2,m,q, diameters, bore and center distance as editable parameters.