poster-tube-lid.scad

   1 // -*- C -*-
   2
   3 include <funcs.scad>
   4
   5 coarse = false;
   6
   7 main_dia = 71.2 + 0.50 - 2.26;
   8 top_thick_middle = 4;
   9 top_thick_by_oring = 3.0;
  10 top_middle_dr = 11;
  11
  12 main_cnr = 6.0;
  13
  14 min_wall = 3;
  15
  16 rivet_posn = 6.0 + 0.30;
  17 rivet_thick = 1.67;
  18 rivet_width = 4.15 + 1.0;
  19 rivet_tall = 5.51 + 1.49;
  20
  21 over_rivet_wall = 1.0;
  22 side_rivet_gap = 1.5;
  23 inside_rivet_gap = 1.5;
  24
  25 bayo_interf = 0.30;
  26 bayo_behind = 3.5;
  27 bayo_interf_width = 2.0;
  28 bayo_interf_slope = 0.5;
  29
  30 oring_thick = 5.0;
  31 oring_bore = 62.0;
  32
  33 oring_upper_embed_angle = 80;
  34 oring_compress = 0.1; // proportion
  35 oring_compress_more = 0.2;
  36
  37 oring_rm_beside = 8;
  38 oring_rm_scale = 2.0;
  39 oring_rm_angle = 20;
  40
  41 side_taper = 1.0;
  42
  43 bayo_gap = 6.0;
  44
  45 bayo_entry = bayo_behind/3;
  46
  47 bayo_slice_size = coarse ? 5 : 1;
  48
  49 brace_hole_width = 1.0;
  50 brace_above_below = 1.2;
  51 brace_end_shorter = 0.3;
  52
  53 jig_thick = 1.4;
  54 jig_hole_dia = 3.0;
  55 jig_rim = 5;
  56 jig_mark = 5;
  57
  58 strap_hoop_thick = 6;
  59 strap_hoop_inside = 10;
  60 strap_hoop_strlen = 10;
  61 strap_hoop_elevation = 45;
  62
  63 sm_inner_circum = 218 - 1.90 - 1.00 - 0.50;
  64 sm_main_thick = 2.0;
  65 sm_main_width = 20;
  66
  67 sm_bolt_dia = 3.5 + 0.1;
  68 sm_bolt_shaft = 21.9;
  69 sm_bolt_head_dia = 6.94 + 1.0;
  70 sm_bolt_head_thick = 2.14;
  71 sm_bolt_nut_width = 5.89 + 0.25;
  72 sm_bolt_nut_thick = 3.68;
  73 sm_bolt_tighten_allow = 2.0;
  74
  75 sm_bolt_y_clear = 0.75;
  76 sm_bolt_y_over = 0.5;
  77
  78 sm_closure_cnr = 3.0;
  79
  80 catch_stalk_h = 5.0;
  81 catch_stalk_len = 50;
  82 catch_tip_th = 5;
  83 catch_head_th = 3;
  84
  85 catch_pin_slop = 0.25; // each side, and above
  86 catch_pin_slop_x_extra = -0.55; // only on one side
  87 catch_stalk_above_gap = 1.5;
  88 catch_stalk_eff_bend_rad = catch_stalk_len * 0.75;
  89
  90 catch_strap_width = 12;
  91 catch_stalk_base_width = catch_stalk_h;
  92
  93 catch_knob_dia = 6;
  94 catch_knob_above_gap = 5;
  95 catch_knob_height = 3.0;
  96
  97 catch_stalk_below_gap = 1.0;
  98 catch_stalk_beside_gap = 2.0;
  99
 100 // calculated
 101
 102 TAU = PI*2;
 103
 104 bayo_entry_x = bayo_entry;
 105 bayo_entry_z = bayo_entry;
 106 bayo_inramp_x = bayo_entry;
 107 bayo_inramp_z = bayo_entry;
 108
 109 oring_mid_dia = oring_bore + oring_thick;
 110 oring_outer_dia = oring_mid_dia + oring_thick;
 111
 112 oring_oblate = (1 - oring_compress);
 113
 114 oring_y_rad = oring_thick/2 * oring_oblate;
 115 oring_x_rad = oring_thick/2 / oring_oblate;
 116
 117 by_oring_z = oring_y_rad * (1 + cos(oring_upper_embed_angle));
 118
 119 side_height = rivet_posn + bayo_behind + rivet_thick/2;
 120 side_thick = rivet_tall + over_rivet_wall;
 121
 122 top_z = top_thick_by_oring + oring_y_rad + by_oring_z;
 123
 124 middle_bot_z = top_z - top_thick_middle;
 125
 126 bayo_entry = bayo_behind / 3.0;
 127 bayo_top_z = bayo_behind + bayo_gap;
 128
 129 bayo_nom_rad = main_dia/2 + side_thick;
 130 bayo_real_rad = main_dia/2 + rivet_tall;
 131
 132 rivet_entry_width = rivet_width + side_rivet_gap;
 133
 134 jig_mark_rad = jig_mark + main_dia/2 + jig_thick;
 135
 136 handling_dia = oring_bore + oring_thick*2 + min_wall*2;
 137 handling_angle = 45;
 138
 139 sm_inner_rad = (sm_inner_circum + sm_bolt_tighten_allow/2) / TAU;
 140 sm_outer_rad = sm_inner_rad + sm_main_thick;
 141
 142 smc_pos = [ 0, sm_inner_rad, 0 ];
 143
 144 smc_bolt_nut_dia = sm_bolt_nut_width / cos(30);
 145 smc_bolt_nut_eff_thick = sm_bolt_nut_thick + sm_bolt_tighten_allow;
 146
 147 smc_bolt_y = sm_bolt_dia/2 + sm_bolt_y_clear;
 148 smc_max_y = smc_bolt_y + sm_bolt_y_over
 149   + max(sm_bolt_head_dia/2, smc_bolt_nut_dia/2);
 150 smc_cnr_c_x = sm_bolt_shaft/2 - sm_closure_cnr
 151   + sm_bolt_head_thick/2 + smc_bolt_nut_eff_thick/2;
 152
 153 catch_cr = catch_knob_dia/2 + catch_stalk_beside_gap;
 154 catch_strap_thick = sm_main_thick;
 155
 156 echo("R ", sm_inner_rad, bayo_real_rad, bayo_nom_rad);
 157
 158 $fs= coarse ? 2.5 : 0.5;
 159 $fa= coarse ? 5 : 1;
 160
 161 include <poster-tube-lid-parametric.scad>
 162
 163 // bayonet definition
 164
 165 bayo_a = [ bayo_entry_x, 0 ];
 166 bayo_p = [ 0, bayo_entry_z ];
 167 bayo_n = [ 0, bayo_behind-bayo_inramp_z ];
 168 bayo_m = [ bayo_inramp_x, bayo_behind ];
 169 bayo_l = bayo_m + bayo_interf * [ 1/bayo_interf_slope,  1 ];
 170 bayo_k = bayo_l + [ bayo_interf_width, 0 ];
 171 bayo_j = bayo_k + bayo_interf * [ 1/bayo_interf_slope, -1 ];
 172 bayo_i = bayo_j + [ rivet_width + inside_rivet_gap, 0 ];
 173 bayo_h = [ bayo_i[0], bayo_behind + bayo_gap + bayo_interf ];
 174 bayo_g = [ bayo_m[0] - rivet_width, bayo_h[1] ];
 175
 176 bayo_e = [-bayo_p[0], bayo_p[1]] - [rivet_entry_width,0];
 177 bayo_d = [-bayo_a[0], bayo_a[1]] - [rivet_entry_width,0];
 178 bayo_c = bayo_d + [0,-5];
 179 bayo_b = bayo_a + [0,-5];
 180
 181 bayo_f = [ bayo_e[0], bayo_g[1] + (bayo_e[0] - bayo_g[0]) ];
 182
 183 bayo_polygon = [ bayo_a,
 184                  bayo_b,
 185                  bayo_c,
 186                  bayo_d,
 187                  bayo_e,
 188                  bayo_f,
 189                  bayo_g,
 190                  bayo_h,
 191                  bayo_i,
 192                  bayo_j,
 193                  bayo_k,
 194                  bayo_l,
 195                  bayo_m,
 196                  bayo_n,
 197                  bayo_p ];
 198
 199 echo(bayo_polygon);
 200
 201 // CATCH
 202
 203 cppxC = 0.41 * sm_inner_rad * TAU;
 204
 205 // catch pin
 206
 207 cpp_adj = (bayo_n[0] - bayo_f[0]) * (1 - sm_inner_rad / bayo_nom_rad);
 208 // radius scaling due to nom and actual radius difference in
 209 // bayo entry construction
 210
 211 cppa = bayo_f + [1,-1] * catch_pin_slop + [1,0] * cpp_adj;
 212 cppb = bayo_g + [1,-1] * catch_pin_slop + [1,0] * cpp_adj;
 213 cppd = [ bayo_n[0]
 214          - catch_pin_slop - catch_pin_slop_x_extra,
 215          -catch_stalk_above_gap ];
 216 cppc = [ cppd[0], cppb[1] ];
 217 cpph = cppd + [0,-1] * catch_stalk_h;
 218 cppe = cppd + [0,-1] * (catch_knob_above_gap + catch_knob_dia/2);
 219 cppf = [ cppa[0], cppe[1] ];
 220 cppg = [ cppa[0], cpph[1] ];
 221 cppB = 0.5 * (cppf + cppe);
 222
 223 echo("RR", sm_inner_rad / bayo_nom_rad);
 224
 225 // catch assembly depression below pin
 226
 227 cppy6 = cppB[1] - (catch_knob_dia/2
 228                    + (cppc[1] - cppd[1])
 229                    + catch_stalk_below_gap);
 230 cpp7 = [ cppB[0], cppy6 + catch_cr ];
 231 cpp11 = cpp7 + [1,0] * catch_cr;
 232 cppy9 = cppy6 + catch_strap_width * 1/3;
 233 cpp9 = [ cpp7[0] + catch_cr * 2, cppy9 ];
 234 cpp8 = cpp9 + [0,-1] * catch_cr;
 235 cpp10 = cpp8 + [-1,0] * catch_cr;
 236 cppC = [ cppxC, cpp9[1] ];
 237 cppD = cppC + [0,-1] * catch_strap_width;
 238
 239 // catch assembly stalk and so on
 240
 241 catch_cr3 = catch_cr + catch_stalk_h;
 242
 243 cppF = [ cppg[0] - catch_stalk_eff_bend_rad, cppd[1] ];
 244 cpp4 = [ cppg[0] - catch_stalk_len, cpph[1] ] + [1,-1] * catch_cr;
 245 cpp5 = [ cpp4[0], cppC[1] + catch_cr ];
 246 cpp2 = cpp5 + [-1,0] * (catch_cr * 2 + catch_stalk_base_width);
 247 cpp2r = cpp2 + [1,0] * catch_cr;
 248 cpp2d = cpp2 + [0,-1] * catch_cr;
 249 cpp3 = [ cpp2[0] + catch_cr + catch_cr3, cppd[1] - catch_cr3 ];
 250 cppA = [ -cppxC, cpp9[1] ];
 251 cppE = [ cppA[0], cppD[1] ];
 252
 253 catch_assembly_dy = -cppy9 + catch_strap_width;
 254
 255
 256 module MainProfile(){
 257   main_cnr_pos = [ side_thick, top_z ] - [1,1]*main_cnr;
 258   difference(){
 259     union(){
 260       translate(main_cnr_pos){
 261         intersection(){
 262           difference(){
 263             circle(r = main_cnr);
 264             circle(r = main_cnr * 0.5);
 265           }
 266           square([10,10]);
 267         }
 268       }
 269       polygon([[ -top_middle_dr,        middle_bot_z      ],
 270                [ -top_middle_dr,        top_z             ],
 271                [ main_cnr_pos[0],       top_z             ],
 272                [ side_thick,            main_cnr_pos[1]   ],
 273                [ side_thick,            -side_height      ],
 274                [ side_taper,            -side_height      ],
 275                [ 0,                     -rivet_posn       ],
 276                [ 0,                     by_oring_z        ],
 277                [ -oring_x_rad,          by_oring_z        ],
 278                ],
 279               convexity=10);
 280     }
 281     translate([ oring_mid_dia/2 - main_dia/2, 0 ])
 282       hull(){
 283       translate([ 0, oring_y_rad ])
 284         scale([ 1/oring_oblate * (oring_compress_more+1) , oring_oblate ])
 285         circle(oring_thick/2);
 286       translate([ 0, oring_y_rad*2 - oring_thick/2 ])
 287         circle(oring_thick/2);
 288     }
 289   }
 290 }
 291
 292 module StrapHoopProfile(){
 293   circle(r = strap_hoop_thick/2);
 294 }
 295
 296 module StrapHoop(){ ////toplevel
 297   bigrad = strap_hoop_inside/2 + strap_hoop_thick/2;
 298   extralen = strap_hoop_thick * 5;
 299
 300   intersection(){
 301     rotate([strap_hoop_elevation, 0,0]){
 302       for (x= [ -1, +1 ] * bigrad) {
 303         translate([x, -extralen, 0])
 304           rotate([-90,0,0])
 305           linear_extrude(height= extralen + strap_hoop_strlen + 0.1,
 306                          convexity=10)
 307           StrapHoopProfile();
 308       }
 309       translate([0, strap_hoop_strlen, 0]){
 310         intersection(){
 311           rotate_extrude(convexity=10)
 312             translate([bigrad, 0,0])
 313             StrapHoopProfile();
 314           translate([0,50,0])
 315             cube([100,100,100], center=true);
 316         }
 317       }
 318     }
 319     translate([0, 50, 0])
 320       cube(100, center=true);
 321   }
 322 }
 323
 324 module RotateProjectSlice(offset, slice_size, nom_rad, real_rad){
 325   // nom_rad > real_rad
 326   rotate([0,0, atan2(offset, nom_rad) ]){
 327     intersection(){
 328       translate([-offset, -10, 0])
 329         rotate([90,0,0])
 330         linear_extrude(height= nom_rad*2)
 331         children(0);
 332       translate([0,0, -25])
 333         cylinder(h=50, r= real_rad);
 334       translate([0,0, -25])
 335         linear_extrude(height= 50)
 336         polygon([ [ 0,0 ],
 337                   [ -slice_size, -real_rad*2 ],
 338                   [ +slice_size, -real_rad*2 ] ]);
 339     }
 340   }
 341 }
 342
 343 module RotateProject(x_min, x_max, slice_size, nom_rad, real_rad){
 344   offs = [ for (i=[ x_min :
 345                     slice_size :
 346                     x_max + slice_size ]) i ];
 347   echo (offs);
 348   for (off=offs)
 349     RotateProjectSlice(off, slice_size, nom_rad, real_rad)
 350     children(0);
 351 }
 352
 353 module BayonetCutout(){
 354   RotateProject(bayo_c[0], bayo_i[0], bayo_slice_size,
 355                 bayo_nom_rad,
 356                 bayo_real_rad)
 357     translate([-0.5 * (bayo_a[0] + bayo_d[0]), 0])
 358     polygon(bayo_polygon, convexity=10);
 359 }
 360
 361 module ProfilesDemo(){ ////toplevel
 362   translate([-10,0]) MainProfile();
 363   translate([+10, -side_height]) polygon(bayo_polygon, convexity=10);
 364 }
 365
 366 module LimitForHandling(){ ////toplevel
 367   hull() for (r=[0,180])
 368     rotate([0,0,r]) {
 369       for (rs=[-1,+1]) {
 370         for (xd=[0,1]) {
 371           rotate([0,0, rs * handling_angle/2]) {
 372             translate([rs * xd * main_dia/2 * tan(handling_angle/2),
 373                        main_dia/2 + side_thick - main_cnr,
 374                        top_z - main_cnr]) {
 375               mirror([0,0,1])
 376                 cylinder(r= main_cnr, h=50);
 377               sphere(main_cnr);
 378             }
 379           }
 380         }
 381       }
 382     }
 383   hull() rotate_extrude(){
 384     translate([ handling_dia/2 - main_cnr, top_z - main_cnr ]) {
 385       circle(r = main_cnr);
 386       mirror([0,1]) square([ main_cnr, 50 ]);
 387     }
 388   }
 389   //cylinder(r= handling_dia/2, h=20);
 390 }
 391
 392 module Cover(){ ////toplevel
 393   render() difference(){
 394     intersection(){
 395       union(){
 396         rotate_extrude(convexity=10)
 397           translate([main_dia/2, 0])
 398           MainProfile();
 399         translate([0,0, middle_bot_z])
 400           cylinder(h= top_thick_middle, r = main_dia/2 - top_middle_dr + 1);
 401       }
 402       LimitForHandling();
 403     }
 404     for (r=[0,180]){
 405       rotate([0,0, r])
 406         translate([0,0, -side_height])
 407         BayonetCutout();
 408       rotate([0,0, r + asin((-oring_rm_beside) / (main_dia/2))])
 409         translate([0,
 410                    oring_mid_dia/2 + oring_thick/4 * oring_rm_scale,
 411                    oring_y_rad * 1.5])
 412         rotate([-oring_rm_angle, 0, 0])
 413         mirror([0,0,1])
 414         cylinder(r = oring_thick/4 * oring_rm_scale, h=20);
 415     }
 416     for (r=[0 : 60 : 179]) {
 417       rotate([0,0, r]) {
 418         height = top_thick_middle - brace_above_below*2;
 419         translate([0,0, middle_bot_z + brace_above_below + height/2 ])
 420         cube(center=true, [ oring_bore - brace_end_shorter,
 421                             brace_hole_width, height ]);
 422       }
 423     }
 424   }
 425   for (r=[0,180])
 426     rotate([0,0,r])
 427       translate([-implheadcup_large_dia * .5 - implheadcup_thick/2,
 428                  -implheadcup_large_dia * .0,
 429                  middle_bot_z + 0.1])
 430       ImplHeadCup();
 431 //  translate(strap_hoop_thick * [-0.5, 0, +1])
 432 //    translate([handling_dia/2, 0, -side_height])
 433 //    rotate([0,180,0]) rotate([0,0,90])
 434 //    StrapHoop();
 435 }
 436
 437 module SavingHole(){
 438   translate([0,0, -10])
 439     cylinder(r= main_dia/2 - jig_rim, h=20);
 440 }
 441
 442 module Jig(){ ////toplevel
 443   difference(){
 444     union(){
 445       translate([0,0, -side_height]){
 446         cylinder(r= main_dia/2 + jig_thick, h= side_height + jig_thick);
 447       }
 448       translate([-jig_mark_rad, 0, jig_thick - jig_mark])
 449         cube([jig_mark_rad*2, jig_mark, jig_mark]);
 450     }
 451     translate([0,0, -side_height-1])
 452       cylinder(r= main_dia/2, h= side_height + 1);
 453     SavingHole();
 454     translate([0,0, -rivet_posn])
 455       rotate([90, 0,0])
 456       translate([0,0, -100])
 457       cylinder(r= jig_hole_dia/2, h = 200);
 458   }
 459 }
 460
 461 module CoverTest2(){ ////toplevel
 462   difference(){
 463     Cover();
 464     SavingHole();
 465   }
 466 }
 467
 468 module CoverTest1(){ ////toplevel
 469   difference(){
 470     CoverTest2();
 471     difference(){
 472       for (r= [ 40, 147 ]){
 473         rotate([0,0, r]){
 474           translate([0,0, -10]) {
 475             cube([ main_dia*3, main_dia * .53, 18], center=true);
 476           }
 477         }
 478       }
 479 //      translate([ 50, 0, 0 ])
 480 //      cube([ 100,
 481 //             strap_hoop_inside + strap_hoop_thick*2 + 1,
 482 //             100 ],
 483 //           center=true);
 484     }
 485   }
 486 }
 487
 488 module ImplHeadCupTest(){ ////toplevel
 489   for (r=[0,180])
 490     rotate([0,0,r])
 491       translate([-17,0,0])
 492       ImplHeadCup();
 493 }
 494
 495 module SomeStrap(width){
 496   // children(0) is to add, (1) subtract
 497   difference(){
 498     union(){
 499       cylinder(r=sm_outer_rad, h=width);
 500       StrapMountProtrusion(smc_cnr_c_x + sm_closure_cnr,
 501                            smc_max_y,
 502                            sm_closure_cnr,
 503                            width);
 504       children(0);
 505     }
 506     translate([0,0,-1])
 507       cylinder(r=sm_inner_rad, h=width+2);
 508     translate(smc_pos)
 509       StrapMountBolt(10, width);
 510     translate(smc_pos)
 511       cube([ sm_bolt_tighten_allow, 40,100 ], center=true);
 512     children(1);
 513   }
 514 }
 515
 516 module StrapMountBolt(l_delta, strap_width){ ///toplevel
 517   // positioned relative to smc_pos
 518   translate([(smc_bolt_nut_eff_thick - sm_bolt_head_thick)/2,
 519              smc_bolt_y,
 520              strap_width/2]){
 521     translate([ -sm_bolt_shaft/2-1, 0,0 ]){
 522       rotate([0,90,0]) cylinder(r= sm_bolt_dia/2, h= sm_bolt_shaft+2);
 523     }
 524     translate([ -sm_bolt_shaft/2, 0,0 ])
 525       rotate([0,-90,0])
 526       cylinder($fn=6, r=smc_bolt_nut_dia/2,
 527                h=smc_bolt_nut_eff_thick + l_delta);
 528     translate([ sm_bolt_shaft/2, 0,0 ])
 529       rotate([0,90,0])
 530       cylinder(r=sm_bolt_head_dia/2, h=sm_bolt_head_thick + l_delta);
 531   }
 532 }
 533
 534 module StrapMountProtrusion(half_x, max_y, cnr, width){
 535   translate(smc_pos){
 536     linear_extrude(height=width, convexity=10){
 537       hull(){
 538         for (m = [0,1]) mirror([m,0,0]) {
 539           translate([-(half_x - cnr), max_y - cnr])
 540             circle(r=cnr);
 541           translate([-half_x, -sm_inner_rad])
 542             square([1,1]);
 543         }
 544       }
 545     }
 546   }
 547 }
 548
 549 module StrapMount(){ ////toplevel
 550   SomeStrap(sm_main_width){
 551     rotate([0,0,180]){
 552       StrapMountProtrusion(strap_hoop_inside/2 + strap_hoop_thick,
 553                            strap_hoop_thick,
 554                            sm_closure_cnr);
 555       translate(smc_pos +
 556                 [0,0, sm_main_width] +
 557                 strap_hoop_thick * [ 0, 0.5, -1.0 ])
 558         StrapHoop();
 559     }
 560     union(){ };
 561   }
 562 }
 563
 564 module CatchAssemblyCoreProfile(){
 565   difference(){
 566     union(){
 567       hull(){
 568         translate(cpp3) circle(r= catch_cr3);
 569         polygon([ cpp3,
 570                   cpp2r,
 571                   cpp5,
 572                   cpph,
 573                   cppd
 574                   ]);
 575       }
 576       polygon([cppD,
 577                cppC,
 578                cpp9,
 579                cpp10,
 580                cpp11,
 581                cpp4,
 582                cpp2r,
 583                cpp2d,
 584                cppA,
 585                cppE
 586                ]);
 587       translate(cpp8) circle(r= catch_cr);
 588     }
 589     hull(){
 590       translate(cpp4) circle(r= catch_cr);
 591       translate(cpp5) circle(r= catch_cr);
 592       translate(cpp7) circle(r= catch_cr);
 593       polygon([cpp4,
 594                cppg,
 595                cpph,
 596                cpp10,
 597                cpp11,
 598                ]);
 599     }
 600     translate(cpp2) circle(r= catch_cr);
 601   }
 602   // if cpp11 is above cpp10, the subtracted hull above
 603   // can go down too far.  Ensure we do not cut off below cppy6.
 604   polygon([ cppE,
 605             cppD,
 606             cpp9,
 607             [ cpp9[0],            cppy6 ],
 608             [ cpp7[0] - catch_cr, cppy6 ],
 609             cpp2d
 610             ]);
 611 }
 612
 613 module CatchTipProfile(){
 614   intersection(){
 615     translate(cppF){
 616       difference(){
 617         circle(r = dist2d(cppF, cppd));
 618         //circle(r = dist2d(cppF, cppa));
 619       }
 620     }
 621     polygon([ cppa,
 622               cppg,
 623               cpph,
 624               cppd,
 625               cppc,
 626               cppb ]);
 627   }
 628 }
 629
 630 module CatchHeadProfile(){
 631   polygon([ cppd,
 632             cppg,
 633             cppf,
 634             cppe,
 635             cpph ]);
 636 }
 637
 638
 639 module CatchCore(){ /////toplevel
 640   linear_extrude(height=catch_strap_thick, convexity=10)
 641     CatchAssemblyCoreProfile();
 642
 643   linear_extrude(height=catch_tip_th, convexity=10)
 644     CatchTipProfile();
 645
 646   linear_extrude(height=catch_head_th, convexity=10)
 647     CatchHeadProfile();
 648
 649   translate(concat(cppB,[0])) hull(){
 650     translate([0,0, catch_knob_height + catch_head_th - catch_knob_dia/2])
 651       sphere(r = catch_knob_dia/2);
 652     cylinder(r = catch_knob_dia/2, h = 0.1);
 653   }
 654 }
 655
 656 module CatchPreDistort(){ /////toplevel
 657   scale(100 / sm_inner_rad)
 658     rotate([90,0,0])
 659     CatchCore();
 660 }
 661
 662 module CatchAssembly(){ /////toplevel
 663   rotate([0,0, -(cppe[0] + cppB[0] + catch_pin_slop) / sm_inner_rad * 360/TAU])
 664     translate([0,0, catch_assembly_dy])
 665     scale(sm_inner_rad / 100)
 666     import(str("poster-tube-lid,CatchPostDistort-fa",
 667                (coarse ? 20 : 3),
 668                ".stl"),
 669            convexity=20);
 670
 671   SomeStrap(catch_strap_width){
 672     union(){ }
 673     union(){
 674       translate([-200, -200, -200])
 675         cube([400, 200, 400]);
 676     }
 677   }
 678 }
 679
 680 module CatchDemo(){ /////toplevel
 681   color("blue") translate([0,0,
 682                            -catch_assembly_dy
 683              ])
 684     CatchAssembly();
 685   translate([0,0,+side_height
 686              ])
 687     Cover();
 688 }
 689
 690 module CatchDemoS(){ /////toplevel
 691   color("blue") translate([0,0,
 692              -catch_assembly_dy
 693              ])
 694     CatchAssembly();
 695   intersection(){
 696     translate([0,0,+side_height
 697                ])
 698       Cover();
 699     mirror([0,1,0]) translate([-250,33,0]) cube([500,500,500]);
 700   }
 701   color("black")
 702     translate([0,-33,0])
 703     cube([6.15, 2,2], center=true);
 704 }
 705
 706 module CatchPinProfileDemo(){ /////toplevel
 707   echo("G ",
 708        cpp2[0] - cpp1[0],
 709        bayo_n[0] - bayo_e[0]);
 710   color("blue") translate([0,0,
 711                            +1,
 712              ]) {
 713     CatchAssemblyCoreProfile();
 714     CatchHeadProfile();
 715   }
 716   polygon(bayo_polygon, convexity=10);
 717 }
 718
 719 //ProfilesDemo();
 720 //BayonetCutout();
 721 //MainProfile();
 722 //Cover();
 723 //Jig();
 724 //CoverTest();