trailerhubcap.scad

   1 maindia = 29.2;
   2 poleholeh = 5.0;
   3 polecovth = 0.4;
   4 poleholerad = 6;
   5
   6 mainoverlap = 1.5;
   7
   8 hookbasew = 3.5;
   9 hookfullw = 6;
  10 hookheight = 4.5;
  11 hookwidth = 5;
  12 hookbevelw = 0.75;
  13 hookbevelh = 1.5;
  14
  15 fingernaildepth = 5;
  16 fingernailheight = 2.5;
  17 fingernailbased = 0.5;
  18 fingernailwidth = 8;
  19
  20 bigrad = maindia/2 + mainoverlap;
  21 mainth = poleholeh + polecovth;
  22 hooklessdepth = hookfullw - hookbasew;
  23
  24 module base() {
  25   rotate_extrude(convexity=10)
  26     mirror([1,0,0])
  27     polygon(points=[[-bigrad, 0],
  28                     [-bigrad + mainth, -mainth],
  29                     [0, -mainth],
  30                     [0, -poleholeh],
  31                     [-poleholerad, -poleholeh],
  32                     [-poleholerad, 0]]);
  33 }
  34
  35 module fingernails() {
  36   for (ang=[60,180,300])
  37     rotate([0,0,ang])
  38       translate([bigrad - fingernaildepth,
  39                  -fingernailwidth/2,
  40                  -fingernailheight-fingernailbased])
  41       cube([fingernaildepth + 1, fingernailwidth, fingernailheight]);
  42 }
  43
  44 module hookrim() {
  45   rotate_extrude(convexity=10)
  46     mirror([1,0,0])
  47     translate([-maindia/2, 0, 0])
  48     polygon(points=[[hooklessdepth, 0],
  49                     [hookfullw, 0],
  50                     [hookfullw*0.33, hookheight],
  51                     [hookbevelw, hookheight],
  52                     [0, hookheight-hookbevelh],
  53                     [0, hooklessdepth]]);
  54 }
  55
  56 module hooktriangles() {
  57   for (ang=[0,120,240]) {
  58     rotate([0,0,ang]) {
  59       translate([0,0,-1]) {
  60         linear_extrude(height=hookheight+2) {
  61           polygon(points=[[0, 0],
  62                           [maindia/2 + 1, -hookwidth],
  63                           [maindia/2 + 1, +hookwidth]]);
  64         }
  65       }
  66     }
  67   }
  68 }
  69
  70 difference(){
  71   base();
  72   fingernails();
  73 }
  74 intersection(){
  75   hookrim();
  76   hooktriangles();
  77 }