poster-tube-lid.scad

   1 // -*- C -*-
   2
   3 // Print, for each end:
   4 //
   5 //   CoverPrint
   6 //   StrapMount
   7 //   CatchAssembly
   8
   9 include <funcs.scad>
  10 include <utils.scad>
  11
  12 coarse = false;
  13 enable_head_cups = false;
  14
  15 main_dia = 71.2 + 0.50 - 2.26;
  16 top_thick_middle = 4;
  17 top_thick_by_oring = 3.0;
  18 top_middle_dr = 11;
  19
  20 main_cnr = 6.0;
  21
  22 min_wall = 3;
  23
  24 rivet_posn = 6.0 + 0.30;
  25 rivet_thick = 1.67;
  26 rivet_width = 4.15 + 1.0;
  27 rivet_tall = 5.51 + 1.49;
  28
  29 over_rivet_wall = 1.0;
  30 side_rivet_gap = 1.5;
  31 inside_rivet_gap = 1.5;
  32
  33 bayo_interf = 0.30;
  34 bayo_behind = 8.5;
  35 bayo_interf_width = 2.0;
  36 bayo_interf_slope = 0.5;
  37
  38 oring_thick = 5.0;
  39 oring_bore = 62.0;
  40
  41 oring_upper_embed_angle = 80;
  42 oring_compress = 0.1; // proportion
  43 oring_compress_more = 0.2;
  44
  45 oring_rm_beside = 8;
  46 oring_rm_scale = 2.0;
  47 oring_rm_angle = 20;
  48
  49 side_taper = 1.0;
  50
  51 bayo_gap = 6.0;
  52
  53 bayo_entry = 1.167;
  54 bayo_inramp = 0.9;
  55
  56 bayo_slice_size = coarse ? 5 : 1;
  57
  58 brace_hole_width = 1.0;
  59 brace_above_below = 1.2;
  60 brace_end_shorter = 0.3;
  61
  62 jig_thick = 1.4;
  63 jig_hole_dia = 3.0;
  64 jig_rim = 5;
  65 jig_mark = 5;
  66
  67 strap_loop_thick = 6;
  68 strap_loop_inside = 10;
  69 strap_loop_strlen = 10;
  70 strap_loop_elevation = 45;
  71
  72 sm_inner_circum = 218 - 1.90 - 1.00 - 0.50;
  73 sm_main_thick = 2.0;
  74 sm_main_width = 20;
  75
  76 sm_bolt_dia = 3.5 + 0.1;
  77 sm_bolt_shaft = 21.0;
  78 sm_bolt_head_dia = 6.94 + 1.0;
  79 sm_bolt_head_thick = 2.14;
  80 sm_bolt_nut_width = 5.89 + 0.25;
  81 sm_bolt_nut_thick = 3.68;
  82 sm_bolt_tighten_allow = 2.0;
  83
  84 sm_bolt_y_clear = 0.75;
  85 sm_bolt_y_over = 0.5;
  86
  87 sm_closure_cnr = 3.0;
  88
  89 wm_thick = 5;
  90 wm_screw_dia = 5;
  91 wm_screw_around = 5;
  92 wm_csink = 2.5;
  93
  94 catch_stalk_h = 4.5;
  95 catch_stalk_len = 50;
  96 catch_tip_th = 4;
  97 catch_head_th = 3;
  98
  99 catch_pin_slop = 0.25; // each side, and above
 100 catch_pin_slop_x_extra = 0.0; // only on one side
 101 catch_stalk_above_gap = 1.5;
 102 catch_stalk_eff_bend_rad = catch_stalk_len * 0.75;
 103
 104 catch_strap_width = 12;
 105 catch_stalk_base_width = 15;
 106
 107 catch_knob_dia = 6;
 108 catch_knob_above_gap = 5;
 109 catch_knob_height = 3.0;
 110
 111 catch_stalk_below_gap = 1.0;
 112 catch_stalk_beside_gap = 2.0;
 113
 114 // calculated
 115
 116 TAU = PI*2;
 117
 118 bayo_entry_x = bayo_entry;
 119 bayo_entry_z = bayo_entry;
 120 bayo_inramp_x = bayo_inramp;
 121 bayo_inramp_z = bayo_inramp;
 122
 123 oring_mid_dia = oring_bore + oring_thick;
 124 oring_outer_dia = oring_mid_dia + oring_thick;
 125
 126 oring_oblate = (1 - oring_compress);
 127
 128 oring_y_rad = oring_thick/2 * oring_oblate;
 129 oring_x_rad = oring_thick/2 / oring_oblate;
 130
 131 by_oring_z = oring_y_rad * (1 + cos(oring_upper_embed_angle));
 132
 133 side_height = rivet_posn + bayo_behind + rivet_thick/2;
 134 side_thick = rivet_tall + over_rivet_wall;
 135
 136 top_z = top_thick_by_oring + oring_y_rad + by_oring_z;
 137
 138 middle_bot_z = top_z - top_thick_middle;
 139
 140 bayo_top_z = bayo_behind + bayo_gap;
 141
 142 bayo_nom_rad = main_dia/2 + side_thick;
 143 bayo_real_rad = main_dia/2 + rivet_tall;
 144
 145 rivet_entry_width = rivet_width + side_rivet_gap;
 146
 147 jig_mark_rad = jig_mark + main_dia/2 + jig_thick;
 148
 149 handling_dia = oring_bore + oring_thick*2 + min_wall*2;
 150 handling_angle = 45;
 151
 152 sm_inner_rad = (sm_inner_circum + sm_bolt_tighten_allow/2) / TAU;
 153 sm_outer_rad = sm_inner_rad + sm_main_thick;
 154
 155 wm_main_width = sm_main_width;
 156 wm_y_min = sqrt( pow(sm_inner_rad, 2) -
 157                  pow(sm_inner_rad - (wm_thick - sm_main_thick), 2) );
 158
 159 smc_pos = [ 0, sm_inner_rad, 0 ];
 160
 161 smc_bolt_nut_dia = sm_bolt_nut_width / cos(30);
 162 smc_bolt_nut_eff_thick = sm_bolt_nut_thick + sm_bolt_tighten_allow;
 163
 164 smc_bolt_y = sm_bolt_dia/2 + sm_bolt_y_clear;
 165 smc_max_y = smc_bolt_y + sm_bolt_y_over
 166   + max(sm_bolt_head_dia/2, smc_bolt_nut_dia/2);
 167 smc_cnr_c_x = sm_bolt_shaft/2 - sm_closure_cnr
 168   + sm_bolt_head_thick/2 + smc_bolt_nut_eff_thick/2;
 169
 170 catch_cr = catch_knob_dia/2 + catch_stalk_beside_gap;
 171 catch_strap_thick = sm_main_thick;
 172
 173 echo("R ", sm_inner_rad, bayo_real_rad, bayo_nom_rad);
 174
 175 $fs= coarse ? 2.5 : 0.5;
 176 $fa= coarse ? 5 : 1;
 177
 178 include <poster-tube-lid-parametric.scad>
 179
 180 // bayonet definition
 181
 182 bayo_a = [ bayo_entry_x, 0 ];
 183 bayo_p = [ 0, bayo_entry_z ];
 184 bayo_n = [ 0, bayo_behind-bayo_inramp_z ];
 185 bayo_m = [ bayo_inramp_x, bayo_behind ];
 186 bayo_l = bayo_m + bayo_interf * [ 1/bayo_interf_slope,  1 ];
 187 bayo_k = bayo_l + [ bayo_interf_width, 0 ];
 188 bayo_j = bayo_k + bayo_interf * [ 1/bayo_interf_slope, -1 ];
 189 bayo_i = bayo_j + [ rivet_width + inside_rivet_gap, 0 ];
 190 bayo_h = [ bayo_i[0], bayo_behind + bayo_gap + bayo_interf ];
 191 bayo_g = [ bayo_m[0] - rivet_width, bayo_h[1] ];
 192
 193 bayo_e = [-bayo_p[0], bayo_p[1]] - [rivet_entry_width,0];
 194 bayo_d = [-bayo_a[0], bayo_a[1]] - [rivet_entry_width,0];
 195 bayo_c = bayo_d + [0,-5];
 196 bayo_b = bayo_a + [0,-5];
 197
 198 bayo_f = [ bayo_e[0], bayo_g[1] + (bayo_e[0] - bayo_g[0]) ];
 199
 200 bayo_polygon = [ bayo_a,
 201                  bayo_b,
 202                  bayo_c,
 203                  bayo_d,
 204                  bayo_e,
 205                  bayo_f,
 206                  bayo_g,
 207                  bayo_h,
 208                  bayo_i,
 209                  bayo_j,
 210                  bayo_k,
 211                  bayo_l,
 212                  bayo_m,
 213                  bayo_n,
 214                  bayo_p ];
 215
 216 echo(bayo_polygon);
 217
 218 // CATCH
 219
 220 cppxC = 0.41 * sm_inner_rad * TAU;
 221
 222 // catch pin
 223
 224 cpp_adj = (bayo_n[0] - bayo_f[0]) * (1 - sm_inner_rad / bayo_nom_rad);
 225 // radius scaling due to nom and actual radius difference in
 226 // bayo entry construction
 227
 228 cppa = bayo_f + [1,-1] * catch_pin_slop + [1,0] * cpp_adj;
 229 cppb = bayo_g + [1,-1] * catch_pin_slop + [1,0] * cpp_adj;
 230 cppd = [ bayo_n[0]
 231          - catch_pin_slop - catch_pin_slop_x_extra,
 232          -catch_stalk_above_gap ];
 233 cppi = [ cppa[0], cppd[1] ];
 234 cppc = [ cppd[0], cppb[1] ];
 235 cpph = cppd + [0,-1] * catch_stalk_h;
 236 cppe = cppd + [0,-1] * (catch_knob_above_gap + catch_knob_dia/2);
 237 cppf = [ cppa[0], cppe[1] ];
 238 cppg = [ cppa[0], cpph[1] ];
 239 cppB = 0.5 * (cppf + cppe);
 240
 241 echo("RR", sm_inner_rad / bayo_nom_rad);
 242
 243 // catch assembly depression below pin
 244
 245 cppy6 = cppB[1] - (catch_knob_dia/2
 246                    + (cppc[1] - cppd[1])
 247                    + catch_stalk_below_gap);
 248 cpp7 = [ cppB[0], cppy6 + catch_cr ];
 249 cpp11 = cpp7 + [1,0] * catch_cr;
 250 cppy9 = cppy6 + catch_strap_width * 1/3;
 251 cpp9 = [ cpp7[0] + catch_cr * 2, cppy9 ];
 252 cpp8 = cpp9 + [0,-1] * catch_cr;
 253 cpp10 = cpp8 + [-1,0] * catch_cr;
 254 cppC = [ cppxC, cpp9[1] ];
 255 cppD = cppC + [0,-1] * catch_strap_width;
 256
 257 // catch assembly stalk and so on
 258
 259 catch_cr3 = catch_cr + catch_stalk_h;
 260
 261 cppF = [ cppg[0] - catch_stalk_eff_bend_rad, cppd[1] ];
 262 cpp4 = [ cppg[0] - catch_stalk_len, cpph[1] ] + [1,-1] * catch_cr;
 263 cpp5 = [ cpp4[0], cppC[1] + catch_cr ];
 264 cpp2 = cpp5 + [-1,0] * (catch_cr * 2 + catch_stalk_base_width);
 265 cpp2r = cpp2 + [1,0] * catch_cr;
 266 cpp2d = cpp2 + [0,-1] * catch_cr;
 267 cpp3 = [ cpp2[0] + catch_cr + catch_cr3, cppd[1] - catch_cr3 ];
 268 cppA = [ -cppxC, cpp9[1] ];
 269 cppE = [ cppA[0], cppD[1] ];
 270
 271 catch_assembly_dy = -cppy9 + catch_strap_width;
 272
 273
 274 module MainProfile(){
 275   main_cnr_pos = [ side_thick, top_z ] - [1,1]*main_cnr;
 276   difference(){
 277     union(){
 278       translate(main_cnr_pos){
 279         intersection(){
 280           difference(){
 281             circle(r = main_cnr);
 282             circle(r = main_cnr * 0.5);
 283           }
 284           square([10,10]);
 285         }
 286       }
 287       polygon([[ -top_middle_dr,        middle_bot_z      ],
 288                [ -top_middle_dr,        top_z             ],
 289                [ main_cnr_pos[0],       top_z             ],
 290                [ side_thick,            main_cnr_pos[1]   ],
 291                [ side_thick,            -side_height      ],
 292                [ side_taper,            -side_height      ],
 293                [ 0,                     -rivet_posn       ],
 294                [ 0,                     by_oring_z        ],
 295                [ -oring_x_rad,          by_oring_z        ],
 296                ],
 297               convexity=10);
 298     }
 299     translate([ oring_mid_dia/2 - main_dia/2, 0 ])
 300       hull(){
 301       translate([ 0, oring_y_rad ])
 302         scale([ 1/oring_oblate * (oring_compress_more+1) , oring_oblate ])
 303         circle(oring_thick/2);
 304       translate([ 0, oring_y_rad*2 - oring_thick/2 ])
 305         circle(oring_thick/2);
 306     }
 307   }
 308 }
 309
 310 module StrapLoopProfile(){
 311   circle(r = strap_loop_thick/2);
 312 }
 313
 314 module StrapLoop(){ ////toplevel
 315   bigrad = strap_loop_inside/2 + strap_loop_thick/2;
 316   extralen = strap_loop_thick * 5;
 317
 318   intersection(){
 319     rotate([strap_loop_elevation, 0,0]){
 320       for (x= [ -1, +1 ] * bigrad) {
 321         translate([x, -extralen, 0])
 322           rotate([-90,0,0])
 323           linear_extrude(height= extralen + strap_loop_strlen + 0.1,
 324                          convexity=10)
 325           StrapLoopProfile();
 326       }
 327       translate([0, strap_loop_strlen, 0]){
 328         intersection(){
 329           rotate_extrude(convexity=10)
 330             translate([bigrad, 0,0])
 331             StrapLoopProfile();
 332           translate([0,50,0])
 333             cube([100,100,100], center=true);
 334         }
 335       }
 336     }
 337     translate([0, 50, 0])
 338       cube(100, center=true);
 339   }
 340 }
 341
 342 module RotateProjectSlice(offset, slice_size, nom_rad, real_rad){
 343   // nom_rad > real_rad
 344   rotate([0,0, atan2(offset, nom_rad) ]){
 345     intersection(){
 346       translate([-offset, -10, 0])
 347         rotate([90,0,0])
 348         linear_extrude(height= nom_rad*2, convexity=50)
 349         children(0);
 350       translate([0,0, -25])
 351         cylinder(h=50, r= real_rad);
 352       translate([0,0, -25])
 353         linear_extrude(height= 50, convexity=50)
 354         polygon([ [ 0,0 ],
 355                   [ -slice_size, -real_rad*2 ],
 356                   [ +slice_size, -real_rad*2 ] ]);
 357     }
 358   }
 359 }
 360
 361 module RotateProject(x_min, x_max, slice_size, nom_rad, real_rad){
 362   offs = [ for (i=[ x_min :
 363                     slice_size :
 364                     x_max + slice_size ]) i ];
 365   echo (offs);
 366   for (off=offs)
 367     RotateProjectSlice(off, slice_size, nom_rad, real_rad)
 368     children(0);
 369 }
 370
 371 module BayonetCutout(){
 372   RotateProject(bayo_c[0], bayo_i[0], bayo_slice_size,
 373                 bayo_nom_rad,
 374                 bayo_real_rad)
 375     translate([-0.5 * (bayo_a[0] + bayo_d[0]), 0])
 376     polygon(bayo_polygon, convexity=10);
 377 }
 378
 379 module ProfilesDemo(){ ////toplevel
 380   translate([-10,0]) MainProfile();
 381   translate([+10, -side_height]) polygon(bayo_polygon, convexity=10);
 382 }
 383
 384 module LimitForHandling(){ ////toplevel
 385   hull() for (r=[0,180])
 386     rotate([0,0,r]) {
 387       for (rs=[-1,+1]) {
 388         for (xd=[0,1]) {
 389           rotate([0,0, rs * handling_angle/2]) {
 390             translate([rs * xd * main_dia/2 * tan(handling_angle/2),
 391                        main_dia/2 + side_thick - main_cnr,
 392                        top_z - main_cnr]) {
 393               mirror([0,0,1])
 394                 cylinder(r= main_cnr, h=50);
 395               sphere(main_cnr);
 396             }
 397           }
 398         }
 399       }
 400     }
 401   hull() rotate_extrude(convexity=10){
 402     translate([ handling_dia/2 - main_cnr, top_z - main_cnr ]) {
 403       circle(r = main_cnr);
 404       mirror([0,1]) square([ main_cnr, 50 ]);
 405     }
 406   }
 407   //cylinder(r= handling_dia/2, h=20);
 408 }
 409
 410 module Cover(){ ////toplevel
 411   render() difference(){
 412     intersection(){
 413       union(){
 414         rotate_extrude(convexity=10)
 415           translate([main_dia/2, 0])
 416           MainProfile();
 417         translate([0,0, middle_bot_z])
 418           cylinder(h= top_thick_middle, r = main_dia/2 - top_middle_dr + 1);
 419       }
 420       LimitForHandling();
 421     }
 422     for (r=[0,180]){
 423       rotate([0,0, r])
 424         translate([0,0, -side_height])
 425         BayonetCutout();
 426       rotate([0,0, r + asin((-oring_rm_beside) / (main_dia/2))])
 427         translate([0,
 428                    oring_mid_dia/2 + oring_thick/4 * oring_rm_scale,
 429                    oring_y_rad * 1.5])
 430         rotate([-oring_rm_angle, 0, 0])
 431         mirror([0,0,1])
 432         cylinder(r = oring_thick/4 * oring_rm_scale, h=20);
 433     }
 434     for (r=[0 : 60 : 179]) {
 435       rotate([0,0, r]) {
 436         height = top_thick_middle - brace_above_below*2;
 437         translate([0,0, middle_bot_z + brace_above_below + height/2 ])
 438         cube(center=true, [ oring_bore - brace_end_shorter,
 439                             brace_hole_width, height ]);
 440       }
 441     }
 442   }
 443   if (enable_head_cups)
 444     for (r=[0,180])
 445       rotate([0,0,r])
 446         translate([-implheadcup_large_dia * .5 - implheadcup_thick/2,
 447                    -implheadcup_large_dia * .0,
 448                    middle_bot_z + 0.1])
 449         ImplHeadCup();
 450
 451 //  translate(strap_loop_thick * [-0.5, 0, +1])
 452 //    translate([handling_dia/2, 0, -side_height])
 453 //    rotate([0,180,0]) rotate([0,0,90])
 454 //    StrapLoop();
 455 }
 456
 457 module SavingHole(){
 458   translate([0,0, -10])
 459     cylinder(r= main_dia/2 - jig_rim, h=20);
 460 }
 461
 462 module Jig(){ ////toplevel
 463   difference(){
 464     union(){
 465       translate([0,0, -side_height]){
 466         cylinder(r= main_dia/2 + jig_thick, h= side_height + jig_thick);
 467       }
 468       translate([-jig_mark_rad, 0, jig_thick - jig_mark])
 469         cube([jig_mark_rad*2, jig_mark, jig_mark]);
 470     }
 471     translate([0,0, -side_height-1])
 472       cylinder(r= main_dia/2, h= side_height + 1);
 473     SavingHole();
 474     translate([0,0, -rivet_posn])
 475       rotate([90, 0,0])
 476       translate([0,0, -100])
 477       cylinder(r= jig_hole_dia/2, h = 200);
 478   }
 479 }
 480
 481 module CoverPrint(){ ////toplevel
 482   rotate([0,180,0]) Cover();
 483 }
 484
 485 module CoverTest2(){ ////toplevel
 486   difference(){
 487     Cover();
 488     SavingHole();
 489   }
 490 }
 491
 492 module CoverTest1(){ ////toplevel
 493   difference(){
 494     CoverTest2();
 495     difference(){
 496       for (r= [ 40, 147 ]){
 497         rotate([0,0, r]){
 498           translate([0,0, -10]) {
 499             cube([ main_dia*3, main_dia * .53, 18], center=true);
 500           }
 501         }
 502       }
 503 //      translate([ 50, 0, 0 ])
 504 //      cube([ 100,
 505 //             strap_loop_inside + strap_loop_thick*2 + 1,
 506 //             100 ],
 507 //           center=true);
 508     }
 509   }
 510 }
 511
 512 module ImplHeadCupTest(){ ////toplevel
 513   for (r=[0,180])
 514     rotate([0,0,r])
 515       translate([-17,0,0])
 516       ImplHeadCup();
 517 }
 518
 519 module SomeStrap(width){
 520   // children(0) is to add, (1) subtract
 521   difference(){
 522     union(){
 523       cylinder(r=sm_outer_rad, h=width);
 524       StrapMountProtrusion(smc_cnr_c_x + sm_closure_cnr,
 525                            smc_max_y,
 526                            sm_closure_cnr,
 527                            width);
 528       children(0);
 529     }
 530     translate([0,0,-1])
 531       cylinder(r=sm_inner_rad, h=width+2);
 532     translate(smc_pos)
 533       StrapMountBolt(10, width);
 534     translate(smc_pos)
 535       cube([ sm_bolt_tighten_allow, 40,100 ], center=true);
 536     children(1);
 537   }
 538 }
 539
 540 module StrapMountBolt(l_delta, strap_width){ ///toplevel
 541   // positioned relative to smc_pos
 542   translate([(smc_bolt_nut_eff_thick - sm_bolt_head_thick)/2,
 543              smc_bolt_y,
 544              strap_width/2]){
 545     translate([ -sm_bolt_shaft/2-1, 0,0 ]){
 546       rotate([0,90,0]) cylinder(r= sm_bolt_dia/2, h= sm_bolt_shaft+2);
 547     }
 548     translate([ -sm_bolt_shaft/2, 0,0 ])
 549       rotate([0,-90,0])
 550       cylinder($fn=6, r=smc_bolt_nut_dia/2,
 551                h=smc_bolt_nut_eff_thick + l_delta);
 552     translate([ sm_bolt_shaft/2, 0,0 ])
 553       rotate([0,90,0])
 554       cylinder(r=sm_bolt_head_dia/2, h=sm_bolt_head_thick + l_delta);
 555   }
 556 }
 557
 558 module StrapMountProtrusion(half_x, max_y, cnr, width){
 559   translate(smc_pos){
 560     linear_extrude(height=width, convexity=10){
 561       hull(){
 562         for (m = [0,1]) mirror([m,0,0]) {
 563           translate([-(half_x - cnr), max_y - cnr])
 564             circle(r=cnr);
 565           translate([-half_x, -sm_inner_rad])
 566             square([1,1]);
 567         }
 568       }
 569     }
 570   }
 571 }
 572
 573 module StrapMount(){ ////toplevel
 574   SomeStrap(sm_main_width){
 575     rotate([0,0,180]){
 576       StrapMountProtrusion(strap_loop_inside/2 + strap_loop_thick,
 577                            strap_loop_thick,
 578                            sm_closure_cnr,
 579                            sm_main_width);
 580       translate(smc_pos +
 581                 [0,0, sm_main_width] +
 582                 strap_loop_thick * [ 0, 0.5, -1.0 ])
 583         StrapLoop();
 584     }
 585     union(){ };
 586   }
 587 }
 588
 589 module WallMount(){ ////toplevel
 590   SomeStrap(sm_main_width){
 591     union(){
 592       linextr(0, sm_main_width){
 593         translate([ -sm_outer_rad, wm_y_min ])
 594           square([ wm_thick, 20 ]);
 595       }
 596     }
 597     union(){ }
 598   }
 599 }
 600
 601 module CatchAssemblyCoreProfile(){
 602   difference(){
 603     union(){
 604       hull(){
 605         translate(cpp3) circle(r= catch_cr3);
 606         polygon([ cpp3,
 607                   cpp2r,
 608                   cpp5,
 609                   cpph,
 610                   cppd
 611                   ]);
 612       }
 613       polygon([cppD,
 614                cppC,
 615                cpp9,
 616                cpp10,
 617                cpp11,
 618                cpp4,
 619                cpp2r,
 620                cpp2d,
 621                cppA,
 622                cppE
 623                ]);
 624       translate(cpp8) circle(r= catch_cr);
 625     }
 626     hull(){
 627       translate(cpp4) circle(r= catch_cr);
 628       translate(cpp5) circle(r= catch_cr);
 629       translate(cpp7) circle(r= catch_cr);
 630       polygon([cpp4,
 631                cppg,
 632                cpph,
 633                cpp10,
 634                cpp11,
 635                ]);
 636     }
 637     translate(cpp2) circle(r= catch_cr);
 638   }
 639   // if cpp11 is above cpp10, the subtracted hull above
 640   // can go down too far.  Ensure we do not cut off below cppy6.
 641   polygon([ cppE,
 642             cppD,
 643             cpp9,
 644             [ cpp9[0],            cppy6 ],
 645             [ cpp7[0] - catch_cr, cppy6 ],
 646             cpp2d
 647             ]);
 648 }
 649
 650 module CatchTipProfile(dy){
 651   ddy = [0,dy];
 652   intersection(){
 653     translate(cppF){
 654       difference(){
 655 //      circle(r = dist2d(cppF, cppd));
 656         //circle(r = dist2d(cppF, cppa));
 657       }
 658     }
 659     polygon([ cppa,
 660               cppi + ddy,
 661               cppd + ddy,
 662               cppc,
 663               cppb ]);
 664   }
 665 }
 666
 667 module CatchHeadProfile(){
 668   polygon([ cppd,
 669             cppd,
 670             cppi,
 671             cppf,
 672             cppe,
 673             cpph ]);
 674 }
 675
 676
 677 module CatchCore(){ /////toplevel
 678   linear_extrude(height=catch_strap_thick, convexity=10)
 679     CatchAssemblyCoreProfile();
 680
 681   hull(){
 682     linear_extrude(height=catch_head_th, convexity=10)
 683       CatchTipProfile(0);
 684     linear_extrude(height=catch_tip_th, convexity=10)
 685       CatchTipProfile(catch_tip_th - catch_head_th);
 686   }
 687
 688   linear_extrude(height=catch_head_th, convexity=10)
 689     CatchHeadProfile();
 690
 691   translate(concat(cppB,[0])) hull(){
 692     translate([0,0, catch_knob_height + catch_head_th - catch_knob_dia/2])
 693       sphere(r = catch_knob_dia/2);
 694     cylinder(r = catch_knob_dia/2, h = 0.1);
 695   }
 696 }
 697
 698 module CatchPreDistort(){ /////toplevel
 699   scale(100 / sm_inner_rad)
 700     rotate([90,0,0])
 701     CatchCore();
 702 }
 703
 704 module CatchAssembly(){ /////toplevel
 705   rotate([0,0, -(cppe[0] + cppB[0] + catch_pin_slop) / sm_inner_rad * 360/TAU])
 706     translate([0,0, catch_assembly_dy])
 707     scale(sm_inner_rad / 100)
 708     import(str("poster-tube-lid,CatchPostDistort-fa",
 709                (coarse ? 20 : 3),
 710                ".stl"),
 711            convexity=20);
 712
 713   SomeStrap(catch_strap_width){
 714     union(){ }
 715     union(){
 716       translate([-200, -200, -200])
 717         cube([400, 200, 400]);
 718     }
 719   }
 720 }
 721
 722 module CatchDemo(){ /////toplevel
 723   color("blue") translate([0,0,
 724                            -catch_assembly_dy
 725              ])
 726     CatchAssembly();
 727   translate([0,0,+side_height
 728              ])
 729     Cover();
 730 }
 731
 732 module CatchDemoS(){ /////toplevel
 733   color("blue") translate([0,0,
 734              -catch_assembly_dy
 735              ])
 736     CatchAssembly();
 737   intersection(){
 738     translate([0,0,+side_height
 739                ])
 740       Cover();
 741     mirror([0,1,0]) translate([-250,33,0]) cube([500,500,500]);
 742   }
 743   color("black")
 744     translate([0,-33,0])
 745     cube([6.15, 2,2], center=true);
 746 }
 747
 748 module CatchPinProfileDemo(){ /////toplevel
 749   translate([0, 0 * -bayo_behind,0]) {
 750     echo("G ",
 751          bayo_n[0] - bayo_e[0]);
 752     color("blue") translate([0,0,
 753                              +1,
 754                ]) {
 755       CatchAssemblyCoreProfile();
 756       CatchHeadProfile();
 757     }
 758     translate([0,0,10])
 759       color("red")
 760       CatchTipProfile(0);
 761
 762     polygon(bayo_polygon, convexity=10);
 763
 764     // adhoc show a position
 765     color("purple")
 766     translate(concat(
 767                      cppa,
 768                      10
 769                      )) difference(){ circle(2.5); circle(2.0); }
 770
 771  }
 772 }
 773
 774 //ProfilesDemo();
 775 //BayonetCutout();
 776 //MainProfile();
 777 //Cover();
 778 //Jig();
 779 //CoverTest();