belt-slot-cut-jig.scad

   1 // -*- C -*-
   2
   3 crewpunch_slop = 0.3;
   4
   5 holder_min_wall = 2;
   6
   7 holder_attach_xsz = 5;
   8 holder_ctie_width = 4.0 + 0.5;
   9 holder_ctie_thick = 2.0 + 0.5;
  10 holder_attach_walls = 3;
  11 holder_attach_roof = 2.5;
  12
  13 // from careful measurement
  14
  15 crewpunch_shape =
  16   [[  6, [0.6, 6.0], [1.6, 12.3] ],
  17    [  8, [1.1, 6.2], [1.9, 12.5] ],
  18    [ 10, [1.6, 6.5], [2.1, 12.8] ],
  19    [ 12, [1.8, 6.6], [2.3, 12.7] ],
  20    [ 14, [2.1, 6.8], [2.6, 13.0] ],
  21    [ 16, [2.4, 6.9], [2.7, 13.2] ]];
  22
  23 crewpunch_shaft_max_y = 7.5;
  24
  25 crewpunch_systematic_size_error = +0.36;
  26
  27 crewpunch_min_y = 4.7 - crewpunch_systematic_size_error;
  28
  29 crewpunch_smallest_shape = crewpunch_shape[0];
  30 crewpunch_biggest_shape = crewpunch_shape[len(crewpunch_shape)-1];
  31
  32 // computed
  33
  34 attach_ysz = holder_attach_walls*2 + holder_ctie_width;
  35 holder_front_wall = crewpunch_shaft_max_y - crewpunch_biggest_shape[1][1]
  36   + attach_ysz;
  37
  38 holder_block_zsz = crewpunch_biggest_shape[0] - crewpunch_smallest_shape[0];
  39 holder_xsz = crewpunch_biggest_shape[2][0] + crewpunch_biggest_shape[2][1] +
  40   holder_min_wall*2;
  41 holder_ysz = crewpunch_biggest_shape[1][0] + crewpunch_biggest_shape[1][1] +
  42   holder_min_wall + holder_front_wall;
  43
  44 // objects
  45
  46 module CrewPunch(){
  47   ourslop = crewpunch_slop - crewpunch_systematic_size_error;
  48   hull(){
  49     for(layer=crewpunch_shape){
  50       translate([0,0, layer[0]]){
  51         for(xind=[0,1]) //translate([xind?0:1,0,0])
  52           for(yind=[0,1]) //translate([0,yind?0.5:0,0])
  53             mirror([xind?1:0,0,0]) mirror([0,yind?0:1,0]){
  54               translate([-0.1,-0.1,-0.1])
  55                 cube([0.1 + layer[2][xind] + ourslop,
  56                       0.1 + layer[1][yind] + ourslop,
  57                       0.2]);
  58             }
  59       }
  60     }
  61   }
  62 }
  63
  64 module PunchHolder(){
  65   offset = holder_attach_xsz + holder_min_wall;
  66   difference(){
  67     translate([0,offset,0])
  68       cube([holder_xsz, holder_ysz - offset, holder_block_zsz]);
  69     translate([crewpunch_biggest_shape[2][1] + holder_min_wall,
  70                crewpunch_biggest_shape[1][0] + holder_front_wall,
  71                -crewpunch_smallest_shape[0]])
  72       CrewPunch();
  73   }
  74   difference(){
  75     translate([holder_xsz/2 - holder_attach_xsz/2, 0, 0])
  76       cube([holder_attach_xsz,
  77             attach_ysz,
  78             holder_block_zsz + holder_ctie_thick + holder_attach_roof + 1]);
  79     translate([-30, holder_attach_walls, holder_block_zsz + 0.1])
  80       cube([60, holder_ctie_width, holder_ctie_thick]);
  81   }
  82 }
  83
  84 //CrewPunch();
  85 PunchHolder();