/
rear_wheel.scad
46 lines (39 loc) · 1.37 KB
/
rear_wheel.scad
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// Schwalbe Big Apple 20"
// https://www.schwalbe.com/de/tour-reader/big-apple.html
module rear_wheel (tire_width = 55,
rim_width = 25,
rim_diameter = 406,
rim_depth = 15,
rim_depth_extrusion = 10,
spokes = 20,
spoke_diameter = 5,
hub_width = 100,
hub_diameter = 60,
hub_axle_diameter = 12) {
// tire
rotate_extrude(convexity=2, $fn=100) {
translate([rim_diameter/2 + tire_width/2, 0, 0]) circle(r=tire_width/2, $fn=30);
}
// rim
rotate_extrude(convexity=2, $fn=100) {
translate([rim_diameter/2 - rim_depth/2 + rim_depth_extrusion/2, 0, 0]) square(size = [rim_depth+rim_depth_extrusion, rim_width], center=true);
}
// hub
difference() {
cylinder(h=hub_width, r=hub_diameter/2, center=true, $fn=50);
cylinder(h=hub_width + 10, r=hub_axle_diameter/2, center=true, $fn=25);
}
// spokes
for (i=[0:spokes]) {
rotate([0, 0, 360/spokes * i])
translate([0, rim_diameter/2/2, -hub_width/2/2])
rotate([ asin((hub_width/2)/(rim_diameter/2))+90, 0, 0])
cylinder(h=sqrt(pow(hub_width/2,2)+pow(rim_diameter/2-hub_diameter/2,2)), r=spoke_diameter/2, $fn=5, center=true);
}
for (i=[0:spokes]) {
rotate([0, 0, 360/spokes * i + 360/spokes/2])
translate([0, rim_diameter/2/2, +hub_width/2/2])
rotate([ -asin((hub_width/2)/(rim_diameter/2))+90, 0, 0])
cylinder(h=sqrt(pow(hub_width/2,2)+pow(rim_diameter/2-hub_diameter/2,2)), r=spoke_diameter/2, $fn=5, center=true);
}
}