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 = 10;
  31
  32 // calculated
  33
  34 bayo_entry_x = bayo_entry;
  35 bayo_entry_z = bayo_entry;
  36 bayo_inramp_x = bayo_entry;
  37 bayo_inramp_z = bayo_entry;
  38
  39 side_height = rivet_posn + bayo_behind + rivet_thick/2;
  40 side_thick = rivet_tall + over_rivet_wall;
  41
  42 top_z = top_thick + seal_thick;
  43
  44 bayo_entry = bayo_behind / 3.0;
  45 bayo_top_z = bayo_behind + rivet_thick + bayo_above_gap;
  46 bayo_entry_ramp = bayo_entry + bayo_interf;
  47
  48 rivet_entry_width = rivet_width + side_rivet_gap;
  49
  50 $fs=0.5;
  51 $fa=1;
  52
  53 // bayonet definition
  54
  55 bayo_a = [ bayo_entry_x, 0 ];
  56 bayo_p = [ 0, bayo_entry_z ];
  57 bayo_n = [ 0, bayo_behind-bayo_inramp_z ];
  58 bayo_m = [ bayo_inramp_x, bayo_behind ];
  59 bayo_l = bayo_m + bayo_interf * [ 1/bayo_interf_slope,  1 ];
  60 bayo_k = bayo_l + [ bayo_interf_width, 0 ];
  61 bayo_j = bayo_k + bayo_interf * [ 1/bayo_interf_slope, -1 ];
  62 bayo_i = bayo_j + [ rivet_width, 0 ];
  63 bayo_h = [ bayo_i[0], bayo_behind + rivet_thick + bayo_above_gap ];
  64 bayo_g = [ bayo_m[0] - rivet_width, bayo_h[1] ];
  65
  66 bayo_e = [-bayo_p[0], bayo_p[1]] - [rivet_entry_width,0];
  67 bayo_d = [-bayo_a[0], bayo_a[1]] - [rivet_entry_width,0];
  68 bayo_c = bayo_d + [0,-5];
  69 bayo_b = bayo_a + [0,-5];
  70
  71 bayo_f = [ bayo_e[0], bayo_g[1] + (bayo_e[0] - bayo_g[0]) ];
  72
  73 bayo_polygon = [ bayo_a,
  74                  bayo_b,
  75                  bayo_c,
  76                  bayo_d,
  77                  bayo_e,
  78                  bayo_f,
  79                  bayo_g,
  80                  bayo_h,
  81                  bayo_i,
  82                  bayo_j,
  83                  bayo_k,
  84                  bayo_l,
  85                  bayo_m,
  86                  bayo_n,
  87                  bayo_p ];
  88
  89 echo(bayo_polygon);
  90
  91 module MainProfile(){
  92   main_cnr_pos = [ side_thick, top_z ] - [1,1]*main_cnr;
  93   translate(main_cnr_pos){
  94     intersection(){
  95       difference(){
  96         circle(r = main_cnr);
  97         circle(r = main_cnr * 0.5);
  98       }
  99       square([10,10]);
 100     }
 101   }
 102   polygon([[ -1,                    seal_thick        ],
 103            [ -1,                    top_z             ],
 104            [ main_cnr_pos[0],       top_z             ],
 105            [ side_thick,            main_cnr_pos[1]   ],
 106            [ side_thick,            -side_height      ],
 107            [ side_taper,            -side_height      ],
 108            [ 0,                     -rivet_posn       ],
 109            [ 0,                     -(seal_recess[0] + seal_recess[1]) ],
 110            [ seal_recess[0],        -(seal_recess[0]) ],
 111            [ seal_recess[0],        seal_thick        ],
 112            ]);
 113 }
 114
 115 module BayonetCutoutSlice(offset){
 116   rotate([0,0, atan2(offset, main_dia/2 + side_thick) ]){
 117     intersection(){
 118       translate([-offset, -10, 0])
 119         rotate([90,0,0])
 120         linear_extrude(height= main_dia*2)
 121         polygon(bayo_polygon);
 122       translate([0,0, -25])
 123         cylinder(h=50, r= main_dia/2 + rivet_tall);
 124       #translate([0,0, -25])
 125         linear_extrude(height= 50)
 126         polygon([ [ 0,0 ],
 127                   [ -bayo_slice_size, -main_dia ],
 128                   [ +bayo_slice_size, -main_dia ] ]);
 129     }
 130   }
 131 }
 132
 133 module BayonetCutout(){
 134   offs = [ for (i=[-5 : +5]) i ] * bayo_slice_size;
 135   echo (offs);
 136 *    BayonetCutoutSlice(5);
 137   for (off =offs
 138
 139          //[ -20 : bayo_slice_size : 20 ]
 140        ){
 141     translate([ off * 5, 0,0 ])
 142     echo(off);
 143     BayonetCutoutSlice(off);
 144   }
 145 }
 146
 147 module ProfilesDemo(){
 148   translate([-20,0]) MainProfile();
 149   polygon(bayo_polygon);
 150 }
 151
 152 //ProfilesDemo();
 153 BayonetCutout();