belt-slot-cut-jig.scad

   1 // -*- C -*-
   2
   3 // todo
   4 //  attachment point move up so clears when inserted
   5 //  onejig must be deep enough for strap plus motion plus holder
   6 //  even deeper for side rails
   7 //  what about existing slot locator ? maybe not
   8
   9 crewpunch_slop = 0.3;
  10
  11 holder_min_wall = 2;
  12
  13 holder_attach_xsz = 5;
  14 holder_ctie_width = 4.0 + 0.5;
  15 holder_ctie_thick = 2.0 + 0.5;
  16 holder_attach_walls = 3;
  17 holder_attach_roof = 2.5;
  18
  19 jig_interval = 25;
  20 strap_width = 25;
  21 edgewall_width = 3;
  22
  23 main_slop = 0.5;
  24
  25 // from careful measurement
  26
  27 crewpunch_shape =
  28   [[  6, [0.6, 6.0], [1.6, 12.3] ],
  29    [  8, [1.1, 6.2], [1.9, 12.5] ],
  30    [ 10, [1.6, 6.5], [2.1, 12.8] ],
  31    [ 12, [1.8, 6.6], [2.3, 12.7] ],
  32    [ 14, [2.1, 6.8], [2.6, 13.0] ],
  33    [ 16, [2.4, 6.9], [2.7, 13.2] ]];
  34
  35 crewpunch_shaft_max_y = 7.5;
  36
  37 crewpunch_systematic_size_error = +0.36;
  38
  39 crewpunch_min_y = 4.7 - crewpunch_systematic_size_error;
  40
  41 crewpunch_smallest_shape = crewpunch_shape[0];
  42 crewpunch_biggest_shape = crewpunch_shape[len(crewpunch_shape)-1];
  43
  44 // computed
  45
  46 attach_ysz = holder_attach_walls*2 + holder_ctie_width;
  47 holder_front_wall = crewpunch_shaft_max_y - crewpunch_biggest_shape[1][1]
  48   + attach_ysz;
  49
  50 holder_block_zsz = crewpunch_biggest_shape[0] - crewpunch_smallest_shape[0];
  51 holder_xsz = crewpunch_biggest_shape[2][0] + crewpunch_biggest_shape[2][1] +
  52   holder_min_wall*2;
  53 crewpunch_biggest_y =
  54   crewpunch_biggest_shape[1][0] + crewpunch_biggest_shape[1][1];
  55 holder_ysz = crewpunch_biggest_y + holder_min_wall + holder_front_wall;
  56
  57 attach_offset = holder_attach_xsz + holder_min_wall;
  58
  59 // objects
  60
  61 module CrewPunch(){
  62   ourslop = crewpunch_slop - crewpunch_systematic_size_error;
  63   hull(){
  64     for(layer=crewpunch_shape){
  65       translate([0,0, layer[0]]){
  66         for(xind=[0,1]) //translate([xind?0:1,0,0])
  67           for(yind=[0,1]) //translate([0,yind?0.5:0,0])
  68             mirror([xind?1:0,0,0]) mirror([0,yind?0:1,0]){
  69               translate([-0.1,-0.1,-0.1])
  70                 cube([0.1 + layer[2][xind] + ourslop,
  71                       0.1 + layer[1][yind] + ourslop,
  72                       0.2]);
  73             }
  74       }
  75     }
  76   }
  77 }
  78
  79 module PunchHolder(cutouts=true){
  80   translate([-holder_xsz/2,
  81              -holder_ysz + holder_min_wall + crewpunch_biggest_y/2,
  82              0]){
  83     difference(){
  84       translate([0,attach_offset,0])
  85         cube([holder_xsz, holder_ysz - attach_offset, holder_block_zsz]);
  86       if (cutouts)
  87         translate([crewpunch_biggest_shape[2][1] + holder_min_wall,
  88                    crewpunch_biggest_shape[1][0] + holder_front_wall,
  89                    -crewpunch_smallest_shape[0]])
  90           CrewPunch();
  91     }
  92     difference(){
  93       translate([holder_xsz/2 - holder_attach_xsz/2, 0, 0])
  94         cube([holder_attach_xsz,
  95               attach_ysz,
  96               holder_block_zsz + holder_ctie_thick + holder_attach_roof + 1]);
  97       if (cutouts)
  98         translate([-30, holder_attach_walls, holder_block_zsz + 0.1])
  99           cube([60, holder_ctie_width, holder_ctie_thick]);
 100     }
 101   }
 102 }
 103
 104 module OneJig(){
 105   difference(){
 106     translate([-(jig_interval/2 + 1),
 107                -(strap_width/2 + edgewall_width) - attach_offset,
 108                0])
 109       cube([jig_interval + 2,
 110             strap_width + edgewall_width*2 + attach_offset,
 111             holder_ysz]);
 112     minkowski(){
 113       cube([main_slop*2, main_slop*2, 50], center=true);
 114       PunchHolder(false);
 115     }
 116   }
 117 }
 118
 119 //CrewPunch();
 120 //PunchHolder();
 121 //PunchHolder(false);
 122 OneJig();