poster-tube-lid.scad

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