turtle_leg.scad

   1 eps = 0.01;
   2 infty = 100;
   3
   4
   5 beam_len = 36;
   6 beam_w = 8;
   7 beam_h = 4.5;
   8
   9 leg_h = 8;
  10 leg_d = 10;
  11 leg_asym = 1.5;
  12 leg_wall = 1.5;
  13
  14 tail_w1 = 4;
  15 tail_w2 = 2;
  16 tail_h = 2;
  17 tail_len = 11;
  18
  19 screw_d = 4;
  20 screw_head_d = 6;
  21 screw_head_h = 3;
  22
  23 screw_bot_d = 5;
  24 screw_bot_h = 2;
  25
  26 lever_hole_d = 5;
  27 lever_hole_x = 6;
  28 lever_space_d = 6.5;
  29 lever_space_d2 = 8;
  30 lever_h = 1;
  31
  32 module body() {
  33         // main beam
  34         translate([-beam_len/2, -beam_w/2, 0])
  35                 cube([beam_len, beam_w, beam_h]);
  36         // legs
  37         for (x = [-1, 1]) {
  38                 scale([x, 1, 1]) translate([beam_len/2, 0, 0]) scale([1, leg_asym, 1])
  39                         cylinder(r1 = beam_w/(2*leg_asym), r2 = leg_d/(2*leg_asym), h = leg_h);
  40         }
  41
  42         // reinforcement for the screw hole
  43         cylinder(r = screw_bot_d/2 + 2, h = beam_h);
  44
  45         // reinforcement for the lever hole
  46         intersection() {
  47                 translate([lever_hole_x, 0, 0])
  48                         cylinder(r = lever_space_d/2 + 2, h = beam_h);
  49                 translate([-infty/2, -infty, 0]) cube(infty);
  50         }
  51
  52 /*
  53         // tail
  54         hull() {
  55                 translate([-tail_w1/2, -beam_w/2, 0])
  56                         cube([tail_w1, eps, tail_h]);
  57                 translate([-tail_w2/2, -beam_w/2-tail_len, 0])
  58                         cube([tail_w2, eps, tail_h]);
  59         }
  60 */
  61 }
  62
  63 module leg() {
  64         difference() {
  65                 body();
  66
  67                 // legs hole
  68                 hull() for (x = [-1, 1])
  69                         scale([x, leg_asym, 1])
  70                                 translate([beam_len/2, 0, beam_h+eps])
  71                                 cylinder(r1 = (beam_w-2*leg_wall)/(2*leg_asym),
  72                                          r2 = (leg_d-2*leg_wall)/(2*leg_asym),
  73                                         h = leg_h - beam_h + eps);
  74                 // legs side cut
  75                 for (x = [-1, 1]) scale([x, 1 ,1])
  76                         translate([beam_len/2, 0, 0])
  77                         rotate([0, 45, 0])
  78                         translate([0, -infty/2, -infty/2])
  79                                 cube(infty);
  80
  81                 // screw hole
  82                 rotate([0, 0, 45])
  83                 cylinder(r = screw_d/2, h = infty, $fn = 4);
  84                 // screw head
  85
  86                 translate([0, 0, screw_head_h])
  87                         cylinder(r = screw_head_d/2, h = infty);
  88
  89                 // screw bottom
  90                 difference() {
  91                         translate([0, 0, -eps])
  92                                 cylinder(r = screw_bot_d/2, h = screw_bot_h+eps);
  93                         translate([screw_d/2, -infty/2, -infty/2])
  94                                 cube(infty);
  95                 }
  96
  97                 // lever hole
  98                 translate([lever_hole_x, 0, -eps])
  99                         rotate([0, 0, 45])
 100                         cylinder(r = lever_hole_d/2, h = infty, $fn = 4);
 101
 102                 // lever space
 103                 hull() {
 104                         translate([lever_hole_x, 0, -eps])
 105                                 cylinder(r = lever_space_d/2, h=beam_h-lever_h+eps);
 106                         translate([lever_hole_x - lever_space_d2/2, beam_w/2, -eps])
 107                                 cube([lever_space_d2, infty, beam_h-lever_h+eps]);
 108                 }
 109         }
 110 }
 111
 112 leg();
 113