Compound Spur Gear

compound_spur_gear() stacks a small gear on top of a standard plain_spur_gear().

Customizing compound_spur_gear with OpenSCAD parameters

compound_spur_gear builds a plain_spur_gear for the main gear, then stacks a smaller gear on top of it. The nut pocket is always included:

compound_spur_gear( size1 = 5, size2 = 1, thickness1 = 10, thickness2 = 10, axis_bore_diameter = global_default_hole_diameter, chamfer_depth = 1.5, nut_clearance = 0.1, nut_width = global_default_nut_width, nut_thickness = 2.25, nut_offset = 3.5, lock_bore_diameter = global_default_hole_diameter, hub_diameter = 17, rim_thickness = 8, spoke_count = 4, spoke_width = 7, echo_parameters = true );

size1	the main gear size in 1 cm units (default 5).
size2	the small stacked gear size in 1 cm units (default 1).
thickness1	main gear thickness in mm (default 10).
thickness2	small gear thickness in mm (default 10).
axis_bore_diameter	center bore diameter in mm (default global_default_hole_diameter, 3.2 mm, sized for m3 screws).
chamfer_depth	how deep the rim chamfer cuts in mm (default 1.5).
nut_clearance	extra clearance around the nut pocket in mm (default 0.1).
nut_width	nut width across flats in mm (default global_default_nut_width, 5.5 mm, sized for m3 nuts).
nut_thickness	nut thickness in mm (default 2.25).
nut_offset	distance from the lock bore center to the nut pocket center in mm (default 3.5).
lock_bore_diameter	diameter of the lock screw bore on the rim in mm (default global_default_hole_diameter, 3.2 mm).
hub_diameter	central hub diameter in mm (default 17).
rim_thickness	radial thickness of the rim between the teeth and the spoke cutouts in mm (default 8).
spoke_count	number of spokes (default 4).
spoke_width	spoke width in mm (default 7).
echo_parameters	when true (default), the OpenSCAD console echoes the full parameter list when you preview or render the module.

If you leave a parameter out of the module call, that parameter will just have the default value. For example, these are all valid module calls:

compound_spur_gear(); compound_spur_gear(size1=6, size2=2); compound_spur_gear(size1=5, size2=2, thickness2=5);