rc-plane-wheel.scad

   1 infty = 100;
   2 eps = 0.01;
   3
   4 wheel_d = 50;
   5 wheel_h = 3;
   6 wheel_d1 = wheel_d + wheel_h/2;
   7 wheel_thick_outer = 0.5;
   8 wheel_thick_inner = 1.5;
   9 wheel_rim = 3.5;
  10
  11 min_wall = 0.5;
  12
  13 spokes = 5;
  14 spoke_w =  3.5;
  15 spoke_h = 1.5;
  16
  17 center_d = 5;
  18 center_hole = 1 + 0.5;
  19 center_h = 8;
  20
  21 module body() {
  22         // rim
  23         difference() {
  24                 hull() {
  25                         cylinder(r = wheel_d/2, h = wheel_h, $fn = 128);
  26                         translate([0, 0, wheel_h/2-eps])
  27                                 cylinder(r = wheel_d1/2, h = 2*eps, $fn = 128);
  28                 }
  29                 translate([0,0,min_wall-eps])
  30                         cylinder(r1 = wheel_d/2 - wheel_thick_inner,
  31                                 r2 = wheel_d/2 - wheel_thick_outer,
  32                                 h = wheel_h - min_wall+ 2*eps);
  33                 translate([0,0,-eps])
  34                         cylinder(r = wheel_d/2 - wheel_rim,
  35                                 h = min_wall+2*eps);
  36         }
  37
  38         // spokes
  39         for (a = [0:360/spokes:360-eps]) {
  40                 rotate([0, 0, a])
  41                 hull() {
  42                         translate([-spoke_w/2, 0, 0])
  43                                 cube([spoke_w, wheel_d/2 - min_wall/2, min_wall]);
  44                         translate([-min_wall/2, 0, spoke_h-eps])
  45                                 cube([min_wall, wheel_d/2 - min_wall/2, eps]);
  46                 }
  47         }
  48
  49         cylinder(r1 = center_d/2, r2 = center_hole/2 + 2*min_wall, h = center_h);
  50 }
  51
  52 difference() {
  53         body();
  54         // center hole
  55         translate([0, 0, -eps])
  56                 cylinder(r = center_hole/2, h = center_h + 2*eps);
  57 }