sewing-table.scad.m4

   1 // -*- C -*-
   2
   3 include <funcs.scad>
   4 include <commitid.scad>
   5
   6 ply_th = 18;
   7 ply_hole_dia = 15;
   8 ply_edge_min = 10;
   9
  10 tile_th = 3;
  11 post_dia = 8;
  12
  13 post_shorter = 1;
  14
  15 screw_dia = 2.2;
  16 screw_big_dia = 3.6;
  17 screw_big_len = 4.0;
  18
  19 round_edge_rad = 2.0;
  20
  21 interlock_dia = 10;
  22
  23 // calculated
  24
  25 ply_edge_hole_dist = ply_edge_min + ply_hole_dia/2;
  26
  27 echo(str("HOLES IN PLY ctr dist from PLY edge = ", ply_edge_hole_dist));
  28
  29 hole_slop = (ply_hole_dia - post_dia)/2;
  30 tile_hard_edge_hole_dist = ply_edge_hole_dist + hole_slop;
  31
  32 echo(str("HOLES IN PLY ctr dist from TILE HARD edge = ",
  33          tile_hard_edge_hole_dist));
  34
  35 echo(str("HOLES IN PLY ctr dist from TILE ROUND edge = ",
  36          tile_hard_edge_hole_dist + round_edge_rad));
  37
  38 thehd = [ tile_hard_edge_hole_dist, tile_hard_edge_hole_dist ];
  39 thehd_tr = thehd;
  40 thehd_tl = [ -thehd_tr[0], thehd_tr[1] ];
  41 thehd_bl = -thehd_tr;
  42 thehd_br = -thehd_tl;
  43
  44 interlock_rad = interlock_dia/2;
  45 interlock_negative_rad = interlock_rad + 0.125;
  46
  47 module Post(){
  48   mirror([0,0,1]) {
  49     difference(){
  50       cylinder(r= post_dia/2, h= tile_th + ply_th - post_shorter);
  51       translate([0,0, tile_th]) {
  52         cylinder(r= screw_big_dia/2, h= screw_big_len);
  53         cylinder(r= screw_dia/2, h= ply_th, $fn=20);
  54       }
  55     }
  56   }
  57 }
  58
  59 module Posts(posts) {
  60   for (p= posts) {
  61     translate(concat(p, [0]))
  62       Post();
  63   }
  64 }
  65
  66 module TileBase(botleft, topright){
  67   size = topright - botleft;
  68   botleft_post = botleft + thehd_tr;
  69   topright_post = topright - thehd_bl;
  70   echo(botleft_post, topright_post);
  71   difference(){
  72     mirror([0,0,1])
  73       translate(concat(botleft, [0]))
  74       cube(concat(size, [tile_th]));
  75     translate( concat(botleft_post, [-tile_th])
  76                + 0.5 * [ post_dia, post_dia, 0 ] )
  77       Commitid_BestCount_M( topright_post-botleft_post
  78                             + [0, thehd[1] ]
  79                             + [-post_dia,-post_dia] );
  80   }
  81 }
  82
  83 m4_dnl  INREFFRAME(left_post, right_post, morevars) { body; }
  84 m4_define(`INREFFRAME',`
  85   length_vec = ($2) - ($1);
  86   length = dist2d([0,0], length_vec);
  87   length_uvec = length_vec / length;
  88   ortho_uvec = [ -length_uvec[1], length_uvec[0] ];
  89   m = [ [ length_uvec[0],  ortho_uvec[0], 0, ($1)[0], ],
  90         [ length_uvec[1],  ortho_uvec[1], 0, ($1)[1], ],
  91         [ 0,              0,              1,            0, ],
  92         [ 0,              0,              0,            1, ] ];
  93   $3
  94   multmatrix(m)
  95 ')
  96
  97 m4_dnl  INREFFRAME(left_post, right_post, morevars)
  98 m4_dnl    INREFFRAME_EDGE { body; }
  99 m4_define(`INREFFRAME_EDGE',`
 100   translate(concat(-thehd, [-round_edge_rad]))
 101 ')
 102
 103 module RoundEdge(left_post, right_post) {
 104   INREFFRAME(left_post, right_post,
 105               `tlength = length + thehd[0] * 2;') m4_dnl '
 106     INREFFRAME_EDGE {
 107     difference(){
 108       rotate([0,90,0])
 109         cylinder(r= round_edge_rad, h= tlength, $fn=50);
 110       translate([-1, 0, -20])
 111         cube([tlength+2, 20, 20]);
 112     }
 113   }
 114 }
 115
 116 module RoundLeftCorner(this_post, right_post) {
 117   INREFFRAME(this_post, right_post) INREFFRAME_EDGE {
 118     difference(){
 119       sphere(r= round_edge_rad, $fn=60);
 120       translate([0,0, -20])
 121         cube([20,20,20]);
 122     }
 123   }
 124 }
 125
 126 module InterlockCore(r, plusth, ymir) {
 127   dx = sqrt(3) * r;
 128   $fn= 80;
 129   translate([0, -thehd[1], plusth]){
 130     mirror([0,ymir,0]){
 131       mirror([0,0,1]){
 132         linear_extrude(height=tile_th+plusth*2, convexity=10){
 133           circle(r=r);
 134           difference(){
 135             translate([-dx, -0.1])
 136               square([ dx*2, r/2 + 0.1 ]);
 137             for (xi = [-1, 1]) {
 138               translate([ xi*dx, r ])
 139                 circle(r=r);
 140             }
 141           }
 142         }
 143       }
 144     }
 145   }
 146 }
 147
 148 module InterlockNegative(this_post, right_post) {
 149   INREFFRAME(this_post, right_post)
 150     InterlockCore(interlock_negative_rad, 1, 0);
 151 }
 152
 153 module Interlock(this_post, right_post) {
 154   INREFFRAME(this_post, right_post)
 155     InterlockCore(interlock_rad, 0, 1);
 156 }
 157
 158 function TestPiece_holes2corners(holes) =
 159   [ holes[0] + thehd_bl,
 160     holes[1] + thehd_br,
 161     holes[0] + thehd_tl,
 162     holes[1] + thehd_tr ];
 163
 164 module TestPiece1(){ ////toplevel
 165   holes = [ [-100, 0],
 166             [   0, 0]
 167             ];
 168   corners = TestPiece_holes2corners(holes);
 169   difference(){
 170     TileBase(corners[0], corners[3]);
 171     InterlockNegative(holes[1], holes[1] + [0,1]);
 172   }
 173   Posts(holes);
 174   RoundEdge(holes[0], holes[1]);
 175   RoundEdge(holes[0] + [ 0, 0.1 ], holes[0]);
 176   RoundLeftCorner(holes[0], holes[1]);
 177 }
 178
 179 module TestPiece2(){ ////toplevel
 180   holes = [ [   0, 0],
 181             [  50, 0]
 182             ];
 183   corners = TestPiece_holes2corners(holes);
 184   TileBase(corners[0], corners[3]);
 185   Posts(holes);
 186   RoundEdge(holes[0], holes[1]);
 187   Interlock(holes[0], holes[0] + [0, -1]);
 188 }
 189
 190 module Demo(){ ////toplevel
 191   translate([ -thehd[0], 0 ])
 192     color("blue")
 193     TestPiece1();
 194   translate([ +thehd[0], 0 ])
 195     TestPiece2();
 196 }
 197
 198 //TestPiece1();
 199 //TestPiece2();
 200 //Demo();