poster-tube-lid.scad

   1 // -*- C -*-
   2
   3 main_dia = 71.2 + 0.50 - 2.26;
   4 top_thick = 4;
   5
   6 main_cnr = 4.0;
   7
   8 rivet_posn = 6.0;
   9 rivet_thick = 1.67;
  10 rivet_width = 4.15 + 1.0;
  11 rivet_tall = 5.51 + 0.49;
  12
  13 over_rivet_wall = 0.5;
  14 side_rivet_gap = 1.5;
  15
  16 bayo_interf = 0.75;
  17 bayo_behind = 3.5;
  18 bayo_interf_width = 2.0;
  19 bayo_interf_slope = 0.75;
  20
  21 oring_thick = 5.0;
  22 oring_bore = 62.0;
  23
  24 oring_upper_embed_angle = 45;
  25 oring_compress = 0.1; // proportion
  26
  27 side_taper = 1.0;
  28
  29 bayo_above_gap = 1.0;
  30
  31 bayo_entry = bayo_behind/3;
  32
  33 bayo_slice_size = 1;
  34
  35 brace_hole_width = 1.0;
  36 brace_above_below = 1.2;
  37
  38 jig_thick = 1.4;
  39 jig_hole_dia = 3.0;
  40 jig_rim = 5;
  41 jig_mark = 5;
  42
  43 // calculated
  44
  45 bayo_entry_x = bayo_entry;
  46 bayo_entry_z = bayo_entry;
  47 bayo_inramp_x = bayo_entry;
  48 bayo_inramp_z = bayo_entry;
  49
  50 oring_mid_dia = oring_bore + oring_thick;
  51 oring_outer_dia = oring_mid_dia + oring_thick;
  52
  53 seal_thick = (1 - oring_compress) * oring_thick/2
  54   * (1 + cos(oring_upper_embed_angle));
  55
  56 side_height = rivet_posn + bayo_behind + rivet_thick/2;
  57 side_thick = rivet_tall + over_rivet_wall;
  58
  59 top_z = top_thick + seal_thick;
  60
  61 bayo_entry = bayo_behind / 3.0;
  62 bayo_top_z = bayo_behind + rivet_thick + bayo_above_gap;
  63 bayo_entry_ramp = bayo_entry + bayo_interf;
  64
  65 rivet_entry_width = rivet_width + side_rivet_gap;
  66
  67 jig_mark_rad = jig_mark + main_dia/2 + jig_thick;
  68
  69 $fs=0.5;
  70 $fa=1;
  71
  72 // bayonet definition
  73
  74 bayo_a = [ bayo_entry_x, 0 ];
  75 bayo_p = [ 0, bayo_entry_z ];
  76 bayo_n = [ 0, bayo_behind-bayo_inramp_z ];
  77 bayo_m = [ bayo_inramp_x, bayo_behind ];
  78 bayo_l = bayo_m + bayo_interf * [ 1/bayo_interf_slope,  1 ];
  79 bayo_k = bayo_l + [ bayo_interf_width, 0 ];
  80 bayo_j = bayo_k + bayo_interf * [ 1/bayo_interf_slope, -1 ];
  81 bayo_i = bayo_j + [ rivet_width, 0 ];
  82 bayo_h = [ bayo_i[0], bayo_behind + rivet_thick + bayo_above_gap ];
  83 bayo_g = [ bayo_m[0] - rivet_width, bayo_h[1] ];
  84
  85 bayo_e = [-bayo_p[0], bayo_p[1]] - [rivet_entry_width,0];
  86 bayo_d = [-bayo_a[0], bayo_a[1]] - [rivet_entry_width,0];
  87 bayo_c = bayo_d + [0,-5];
  88 bayo_b = bayo_a + [0,-5];
  89
  90 bayo_f = [ bayo_e[0], bayo_g[1] + (bayo_e[0] - bayo_g[0]) ];
  91
  92 bayo_polygon = [ bayo_a,
  93                  bayo_b,
  94                  bayo_c,
  95                  bayo_d,
  96                  bayo_e,
  97                  bayo_f,
  98                  bayo_g,
  99                  bayo_h,
 100                  bayo_i,
 101                  bayo_j,
 102                  bayo_k,
 103                  bayo_l,
 104                  bayo_m,
 105                  bayo_n,
 106                  bayo_p ];
 107
 108 echo(bayo_polygon);
 109
 110 module MainProfile(){
 111   main_cnr_pos = [ side_thick, top_z ] - [1,1]*main_cnr;
 112   difference(){
 113     union(){
 114       translate(main_cnr_pos){
 115         intersection(){
 116           difference(){
 117             circle(r = main_cnr);
 118             circle(r = main_cnr * 0.5);
 119           }
 120           square([10,10]);
 121         }
 122       }
 123       polygon([[ -11,                   seal_thick        ],
 124                [ -11,                   top_z             ],
 125                [ main_cnr_pos[0],       top_z             ],
 126                [ side_thick,            main_cnr_pos[1]   ],
 127                [ side_thick,            -side_height      ],
 128                [ side_taper,            -side_height      ],
 129                [ 0,                     -rivet_posn       ],
 130                [ 0,                     seal_thick        ],
 131                ],
 132               convexity=10);
 133     }
 134   }
 135 }
 136
 137 module RotateProjectSlice(offset, slice_size, nom_rad, real_rad){
 138   // nom_rad > real_rad
 139   rotate([0,0, atan2(offset, nom_rad) ]){
 140     intersection(){
 141       translate([-offset, -10, 0])
 142         rotate([90,0,0])
 143         linear_extrude(height= nom_rad*2)
 144         children(0);
 145       translate([0,0, -25])
 146         cylinder(h=50, r= real_rad);
 147       translate([0,0, -25])
 148         linear_extrude(height= 50)
 149         polygon([ [ 0,0 ],
 150                   [ -slice_size, -real_rad*2 ],
 151                   [ +slice_size, -real_rad*2 ] ]);
 152     }
 153   }
 154 }
 155
 156 module RotateProject(x_min, x_max, slice_size, nom_rad, real_rad){
 157   offs = [ for (i=[ x_min :
 158                     slice_size :
 159                     x_max + slice_size ]) i ];
 160   echo (offs);
 161   for (off=offs)
 162     RotateProjectSlice(off, slice_size, nom_rad, real_rad)
 163     children(0);
 164 }
 165
 166 module BayonetCutout(){
 167   RotateProject(bayo_c[0], bayo_i[0], bayo_slice_size,
 168                 main_dia/2 + side_thick,
 169                 main_dia/2 + rivet_tall)
 170     polygon(bayo_polygon, convexity=10);
 171 }
 172
 173 module ProfilesDemo(){ ////toplevel
 174   translate([-20,0]) MainProfile();
 175   polygon(bayo_polygon, convexity=10);
 176 }
 177
 178 module Cover(){ ////toplevel
 179   render() difference(){
 180     union(){
 181       rotate_extrude(convexity=10)
 182         translate([main_dia/2, 0])
 183         MainProfile();
 184       translate([0,0, seal_thick])
 185         cylinder(h= top_thick, r = main_dia/2 - 10);
 186     }
 187     for (r=[0,180])
 188       rotate([0,0, r])
 189         translate([0,0, -side_height])
 190         BayonetCutout();
 191     for (r=[0 : 60 : 179]) {
 192       rotate([0,0, r]) {
 193         height = top_thick - brace_above_below*2;
 194         translate([0,0, seal_thick + brace_above_below + height/2 ])
 195         cube(center=true, [ main_dia, brace_hole_width, height ]);
 196       }
 197     }
 198   }
 199 }
 200
 201 module SavingHole(){
 202   translate([0,0, -10])
 203     cylinder(r= main_dia/2 - jig_rim, h=20);
 204 }
 205
 206 module Jig(){ ////toplevel
 207   difference(){
 208     union(){
 209       translate([0,0, -side_height]){
 210         cylinder(r= main_dia/2 + jig_thick, h= side_height + jig_thick);
 211       }
 212       translate([-jig_mark_rad, 0, jig_thick - jig_mark])
 213         cube([jig_mark_rad*2, jig_mark, jig_mark]);
 214     }
 215     translate([0,0, -side_height-1])
 216       cylinder(r= main_dia/2, h= side_height + 1);
 217     SavingHole();
 218     translate([0,0, -rivet_posn])
 219       rotate([90, 0,0])
 220       translate([0,0, -100])
 221       cylinder(r= jig_hole_dia/2, h = 200);
 222   }
 223 }
 224
 225 module CoverTest2(){ ////toplevel
 226   difference(){
 227     Cover();
 228     SavingHole();
 229   }
 230 }
 231
 232 module CoverTest1(){ ////toplevel
 233   difference(){
 234     CoverTest2();
 235     translate([0,0, -10])
 236       cube([ main_dia*3, main_dia * .85, 20], center=true);
 237   }
 238 }
 239
 240 //ProfilesDemo();
 241 //BayonetCutout();
 242 //MainProfile();
 243 //Cover();
 244 //Jig();
 245 //CoverTest();