wing-tube-support.scad

   1 eps = 0.01;
   2 infty = 100;
   3
   4 wall = 1.2;
   5 thin_wall = 0.6;
   6
   7 tube_d = 6 + 0.1;
   8 tube_zoff = 3;
   9
  10 base_front = 15;
  11 base_rear  = 25;
  12 base_w = base_front + base_rear;
  13 base_l = 15;
  14
  15 tube_l = base_l/2;
  16 base_overhang = 0.9; // factor of base_front, base_r, base_l
  17
  18 module body(tube_zoff) {
  19         // base
  20         // scale([1, base_l/base_w, 1])
  21         // cylinder(r = base_w/2, h = thin_wall);
  22         translate([-base_rear, -base_l/2, 0]) cube([base_w, base_l, thin_wall]);
  23
  24         // front diagonal supports
  25         for (y = [-1,1])
  26         scale([1, y, 1])  hull() {
  27                 translate([base_overhang*base_front-thin_wall/2, base_overhang*base_l/2-thin_wall/2, 0])
  28                         cylinder(r = thin_wall/2, h = thin_wall, $fn = 16);
  29                 translate([0, tube_l/3-thin_wall/2, 0])
  30                         cylinder(r = thin_wall/2, h = tube_zoff + tube_d, $fn = 16);
  31         }
  32
  33         // rear diagonal supports
  34         for (y = [-1,1])
  35         scale([1, y, 1])  hull() {
  36                 translate([-base_overhang*base_rear+thin_wall/2, base_overhang*base_l/2-thin_wall/2, 0])
  37                         cylinder(r = thin_wall/2, h = thin_wall, $fn = 16);
  38                 translate([0, tube_l/3-thin_wall/2, 0])
  39                         cylinder(r = thin_wall/2, h = tube_zoff + tube_d, $fn = 16);
  40         }
  41
  42         // under the tube supports
  43         for (y = [-1,1])
  44         scale([1, y, 1])  hull() {
  45                 translate([0, base_overhang*base_l/2, 0])
  46                         cylinder(r = thin_wall/2, h = thin_wall, $fn = 16);
  47                 translate([-thin_wall/2, 0, 0])
  48                         cube([thin_wall, tube_l/2, tube_zoff]);
  49         }
  50
  51         // side bottom tube supports
  52         for (x = [-1,1])
  53         scale([x, 1, 1]) {
  54                 translate([tube_d/2, -tube_l/2, 0])
  55                         cube([wall, tube_l, tube_zoff + tube_d/2]);
  56                 translate([tube_d/2+wall, -wall, 0])
  57                         cube([wall, 2*wall, tube_zoff + tube_d/2]);
  58         }
  59
  60         // upper cylinder clip
  61         translate([0, -tube_l/2, tube_d/2 + tube_zoff])
  62         intersection() {
  63                 rotate([-90, 0, 0]) union() {
  64                         cylinder(r = tube_d/2 + wall, h = tube_l);
  65                         translate([0, 0, tube_l/2 - wall])
  66                                 cylinder(r = tube_d/2 + 2*wall,
  67                                         h = 2*wall);
  68                 }
  69                 translate([-tube_d/2-2*wall, 0, 0])
  70                         cube([tube_d + 4*wall, tube_l, tube_d]);
  71         }
  72 }
  73
  74 module wing_tube_support(tube_zoff) {
  75         difference() {
  76                 body(tube_zoff);
  77                 // main tube
  78                 translate([0, -base_l/2-eps, tube_d/2+tube_zoff])
  79                 rotate([-90, 0, 0])
  80                         cylinder(r = tube_d/2, h = base_l + 2*eps, $fn = 32);
  81                 // upper clip
  82                 translate([-infty/2, -infty/2, tube_zoff + 5*tube_d/6])
  83                         cube(infty);
  84
  85                 // front-side hole
  86                 translate([0.7*base_front, 0, -eps])
  87                         scale([1, base_l/base_front, 1])
  88                         cylinder(r = base_front/5, h = thin_wall + 2*eps);
  89                 // rear-side hole
  90                 translate([-0.6*base_rear, 0, -eps])
  91                         scale([1, base_l/base_rear, 1])
  92                         cylinder(r = base_rear/4, h = thin_wall + 2*eps);
  93         }
  94 }
  95
  96 for (q = [-1,1]) {
  97         scale([q, 1, 1]) translate([-base_front - 5, 0, 0]) {
  98                         wing_tube_support(1.7);
  99                 translate([0, -base_l -5, 0])
 100                         wing_tube_support(2.8);
 101                 translate([0, base_l + 5, 0])
 102                         wing_tube_support(0.6);
 103         }
 104 }