rc-landing-gear.scad

   1 eps = 0.01;
   2 infty = 300;
   3
   4 base_d = 70;
   5 base_y_scale = 0.7;
   6 base_wall = 1.25;
   7
   8 base_l = 80;
   9 base_w = 30;
  10
  11 rear_angle = 75;
  12
  13 wheel_base = 70;
  14 wheel_h = 50;
  15 wheel_axle_cube = 5;
  16
  17 axle_hole = 2;
  18
  19 beam_w = 1.5;
  20 beam_h = 5;
  21 top_beam_h = 12;
  22
  23 spring_clip_l = 3.5;
  24 spring_clip_w = base_w - 5;
  25 spring_dist = 10;
  26
  27 module rear_cyl() {
  28         translate([0, 0, -beam_w*sin(rear_angle)/2])
  29         rotate([rear_angle-90, 0, 0])
  30                 cylinder(r = beam_w/2, h = beam_h/sin(rear_angle), $fn = 32);
  31 }
  32
  33 module front_cyl() {
  34         rotate([rear_angle-90, 0, 0])
  35                 cylinder(r = beam_w/2, h = beam_h, $fn = 32);
  36 }
  37
  38 module top_cyl() {
  39         rotate([rear_angle-90, 0, 0])
  40                 cylinder(r = beam_w/2, h = top_beam_h, $fn = 32);
  41 }
  42
  43 module body() {
  44         rotate([rear_angle-90, 0, 0])
  45         translate([0, -sqrt(pow(base_d*base_y_scale/2,2) - pow(base_w*base_y_scale/2,2)), 0])
  46         difference() {
  47                 // outer cylinder
  48                 scale([1, base_y_scale, 1])
  49                         cylinder(r = base_d/2, h = base_l);
  50                 // cut the sides
  51                 for (i = [-1, 1]) scale ([i, 1, 1])
  52                         translate([base_w/2, -infty/2, -infty/2])
  53                                 cube(infty);
  54                 // cut the rear
  55                 translate([-infty/2, -infty, -infty/2]) cube(infty);
  56         }
  57
  58         // wheel axle cubes
  59         for (i = [-1, 1]) scale([i, 1, 1])
  60                 translate([wheel_base/2 - wheel_axle_cube, wheel_h - wheel_axle_cube/2, 0])
  61                         cube(wheel_axle_cube);
  62
  63         // rear beams
  64         for (i = [-1, 1]) scale([i,1,1])
  65                 hull() {
  66                         translate([-(base_w/2-beam_w/2), spring_dist, 0])
  67                                 rear_cyl();
  68                         translate([wheel_base/2-beam_w/2, wheel_h, 0])
  69                                 rear_cyl();
  70                 }
  71
  72         // spring top
  73         hull() {
  74                 for (j = [-1, 1])
  75                         translate([j*(base_w/2-beam_w/2), spring_dist, 0])
  76                                 rear_cyl();
  77         }
  78
  79         // spring sides
  80         for (i = [-1, 1]) scale([i,1,1])
  81                 hull() {
  82                         translate([(base_w/2+beam_w), 0, 0])
  83                                 rear_cyl();
  84                         translate([(base_w/2-beam_w/2), spring_dist, 0])
  85                                 rear_cyl();
  86                 }
  87
  88         // front beams
  89         for (i = [-1, 1]) scale([i,1,1])
  90                 for (j = [-1, 1]) hull() {
  91                         translate([j*(base_w/2-beam_w/2), (base_l-top_beam_h)*cos(rear_angle), (base_l-top_beam_h)*sin(rear_angle)])
  92                                 top_cyl();
  93                         translate([wheel_base/2-beam_w/2, wheel_h, 0])
  94                                 front_cyl();
  95                 }
  96
  97         // spring rear clip
  98         translate([-spring_clip_w/2, 0, 0])
  99                 cube([spring_clip_w, spring_clip_l, base_wall]);
 100
 101         // spring clip sides
 102         for (i = [-1, 1]) scale([i,1,1])
 103                 hull() {
 104                         translate([(base_w/2-beam_w/2), 0, 0])
 105                                 rear_cyl();
 106                         translate([(base_w/2-beam_w/2), spring_clip_l - 1.5*beam_w, 0])
 107                                 rear_cyl();
 108                 }
 109 }
 110
 111 difference() {
 112         body();
 113
 114         // inner cylinder hole
 115         rotate([+rear_angle-90, 0, 0])
 116         translate([0, -sqrt(pow(base_d*base_y_scale/2,2) - pow(base_w*base_y_scale/2,2)), -infty/2])
 117                 scale([1, 1*base_y_scale, 1])
 118                         cylinder(r = base_d/2 - base_wall, h = infty);
 119         // cut the bottom
 120         translate([-infty/2, -infty/2, -infty]) cube(infty);
 121         // wheel axle hole
 122         translate([-infty/2, wheel_h, wheel_axle_cube/2])
 123                 rotate([0, 90, 0])
 124                         cylinder(r = axle_hole/2, h = infty);
 125 }
 126