wardrobe-hook.scad

   1 // -*- C -*-
   2
   3 include <funcs.scad>
   4 include <utils.scad>
   5
   6 tubeslop = 0.5;
   7 tubeheight = 30 + tubeslop;
   8 tubewidth = 15 + tubeslop;
   9 mainthick = 4;
  10
  11 clipthick = 2;
  12 clipang = 135;
  13
  14 stemlen = 40;
  15
  16 topwidth = 20;
  17
  18 hookinrad = 7.5;
  19 hookcurl = 60;
  20 hookwidth = 4;
  21
  22 tuberad = tubewidth/2;
  23 bend = atan(tuberad/stemlen);
  24 mainoutrad = tuberad + mainthick;
  25 hookoutrad = hookinrad + hookwidth;
  26 hookcy = -(stemlen - hookoutrad);
  27
  28 eltop = [topwidth/2, -tuberad + tubeheight + mainthick + 0.1];
  29 elmid = [topwidth/2, -tuberad];
  30 ellow = tangent_intersect_b([0,hookcy], hookinrad, elmid);
  31 ellowextra = 180 - tangent_intersect_beta([0,hookcy], hookinrad, elmid);
  32
  33 module ClipPlan(qbend, qstemleny){
  34   dy = tubeheight - tuberad*2;
  35   FArcSegment(0, dy, tuberad, mainoutrad, -1, 181);
  36   FArcSegment(0, 0,  tuberad, mainoutrad, -qbend, qbend+1);
  37   translate([tuberad, 0]) square(center=false, size=[mainthick,dy]);
  38   FArcSegment(0, 0, tuberad, tuberad + clipthick, 360-clipang, clipang+1);
  39   rotate(-qbend) translate([tuberad, 0]) mirror([0,1])
  40     square(center=false, size=[mainthick, qstemleny/cos(qbend)]);
  41 }
  42
  43 module Plan(){
  44   ClipPlan(bend,stemlen);
  45 }
  46
  47 module ElevationCore(){
  48   FArcSegment(0, hookcy, hookinrad, hookoutrad,
  49               180 - ellowextra,
  50               90 + hookcurl + ellowextra);
  51   translate([-hookoutrad*sqrt(0.5),
  52               hookcy - hookoutrad*sqrt(0.5) + 0.1])
  53     mirror([1,0])
  54     square(center=false, size=[topwidth, stemlen + tubeheight + 20]);
  55   polygon([[-hookoutrad, ellow[1]],
  56            reflect_in_y(eltop),
  57            eltop,
  58            elmid,
  59            ellow]);
  60 }
  61
  62 // after here is all 3D
  63
  64 module Primary(){
  65   intersection(){
  66     translate([0,0, -(topwidth+10)/2])
  67       linear_extrude(height=topwidth+10) Plan();
  68     translate([50,0])
  69       rotate([0,-90,0])
  70       linear_extrude(height=100)
  71       ElevationCore();
  72   }
  73 }
  74
  75 module PlaneAbove(){
  76   translate([-100,-100,0]) cube(center=false,size=[200,200,200]);
  77 }
  78
  79 taperangle = -270 + tangent_intersect_beta([-hookcy, 0],
  80                                           hookoutrad,
  81                                           [-eltop[1], -eltop[0]]);
  82 module HookL(){ ////toplevel
  83   difference(){
  84     rotate([taperangle,0,0])
  85       translate([0,-eltop[1],0])
  86       Primary();
  87     translate([0,0,topwidth/2])
  88       rotate([taperangle*2,0,0])
  89       PlaneAbove();
  90     translate([0,0,-topwidth/2])
  91       mirror([0,0,1]) PlaneAbove(0);
  92   }
  93 }
  94
  95 // straight-on version, everything prefixed with s or S
  96
  97 shookcy = -(stemlen-hookoutrad);
  98 sstemleny = -shookcy;
  99 sbend_raw = tangents_intersect_beta([0,0],tuberad,
 100                                     [0,shookcy],hookinrad);
 101 sbend = angle_map_range(360-sbend_raw, -180);
 102
 103 module SPlan(){
 104   ClipPlan(sbend, sstemleny);
 105   FArcSegment(0,shookcy, hookinrad,hookoutrad,
 106               270 - hookcurl,
 107               hookcurl + 90 - sbend);
 108 }
 109
 110 module SElevation(){
 111   boty = shookcy - hookoutrad - 1;
 112   polygon([[-1,         tubeheight],
 113            [topwidth,   tubeheight],
 114            [topwidth,   elmid[1]],
 115            [hookwidth,  shookcy],
 116            [hookwidth,  boty],
 117            [-1,         boty]]);
 118 }
 119
 120 module SElevationPlaced(){
 121   rotate([0,-90,0]) translate([0,0,-100]) linear_extrude(height=200)
 122     SElevation();
 123 }
 124
 125 module SHookL(){ ///toplevel
 126   intersection(){
 127     linear_extrude(height=topwidth) SPlan();
 128     SElevationPlaced();
 129   }
 130 }
 131
 132 // straight-on version, reversed, everything prefixed with t or T
 133
 134 tjoinrad = mainoutrad * 0.7;
 135 tstem0leny = tuberad - tjoinrad*0.5;
 136 tjoinoutrad = tjoinrad + mainthick;
 137
 138 thookcy = shookcy;
 139
 140 tjoin0c = [tuberad - tjoinrad, -tstem0leny];
 141 tjoin1c = [0,                      thookcy];
 142
 143 tbend_raw = tangents_intersect_beta(tjoin0c, tjoinrad,
 144                                     tjoin1c, -hookoutrad);
 145 tbend0 = angle_map_range(tbend_raw,       0);
 146 tbend1 = angle_map_range(tbend_raw + 180, -180);
 147
 148 tbend0p = circle_point(tjoin0c, tjoinrad, tbend_raw);
 149 tbend1p = circle_point(tjoin1c, -hookoutrad, tbend_raw);
 150
 151 module TPlan(){
 152   ClipPlan(0, tstem0leny);
 153   FArcSegment(tjoin0c[0],tjoin0c[1], tjoinrad,tjoinoutrad,
 154               tbend0, 360-tbend0);
 155   FArcSegment(0,shookcy, hookinrad,hookoutrad,
 156               tbend1, 270+hookcurl - tbend1);
 157   translate(tbend0p) {
 158     rotate(tbend_raw+180) mirror([1,0]) {
 159       translate([0,-0.1]) square(size=[mainthick, dist2d(tbend0p,tbend1p)+0.2]);
 160     }
 161   }
 162 }
 163
 164 module THookR(){ ///toplevel
 165   intersection(){
 166     linear_extrude(height=topwidth) TPlan();
 167     SElevationPlaced();
 168   }
 169 }
 170
 171 // other toplevels etc.
 172
 173 module HookR(){ ////toplevel
 174   mirror([1,0,0]) HookL();
 175 }
 176
 177 module SHookR(){ ////toplevel
 178   mirror([1,0,0]) SHookL();
 179 }
 180
 181 module THookL(){ ////toplevel
 182   mirror([1,0,0]) THookR();
 183 }
 184
 185 module Demo(){ ////toplevel
 186   translate([-30,tubeheight,0]) HookL();
 187   translate([  0,tubeheight,0]) HookR();
 188   translate([ 30,         0,0]) SHookL();
 189   translate([ 60,         0,0]) SHookR();
 190   translate([ 90,         0,0]) THookL();
 191   translate([120,         0,0]) THookR();
 192 }