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