Back to docsPlain Spur Gear
plain_spur_gear() is the standard prpol spur gear, with a spoked body, chamfered rim, lock bore, and nut pocket.
Customizing plain_spur_gear with OpenSCAD parameters
plain_spur_gear is the base gear everything else builds on:
plain_spur_gear(
size = 5,
thickness = 10,
axis_bore_diameter = global_default_hole_diameter,
chamfer_depth = 2,
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,
do_nut_pocket = true,
echo_parameters = true
);
| size | the nominal gear size in 1 cm units. The pitch diameter is size * 10 mm and the tooth count is size * 10 (default 5). |
| thickness | 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 2). |
| 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). |
| do_nut_pocket | when true (default), a nut pocket is cut under the lock bore so an m3 nut sits flush. |
| 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:
plain_spur_gear();
plain_spur_gear(size=4);
plain_spur_gear(size=6, thickness=12, spoke_count=6);