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_cnr, right_cnr, 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_cnr, right_cnr, morevars)
  98 m4_dnl    INREFFRAME_EDGE { body; }
  99 m4_define(`INREFFRAME_EDGE',`
 100   translate([0,0, -round_edge_rad])
 101 ')
 102
 103 module RoundEdge(left_cnr, right_cnr) {
 104   INREFFRAME(left_cnr, right_cnr)
 105     INREFFRAME_EDGE {
 106     difference(){
 107       rotate([0,90,0])
 108         cylinder(r= round_edge_rad, h= length, $fn=50);
 109       translate([-1, 0, -20])
 110         cube([length+2, 20, 20]);
 111     }
 112   }
 113 }
 114
 115 module RoundLeftCorner(this_cnr, right_cnr) {
 116   INREFFRAME(this_cnr, right_cnr) INREFFRAME_EDGE {
 117     difference(){
 118       sphere(r= round_edge_rad, $fn=60);
 119       translate([0,0, -20])
 120         cube([20,20,20]);
 121     }
 122   }
 123 }
 124
 125 module InterlockCore(r, plusth, ymir) {
 126   dx = sqrt(3) * r;
 127   $fn= 80;
 128   translate([thehd[0], 0, plusth]){
 129     mirror([0,ymir,0]){
 130       mirror([0,0,1]){
 131         linear_extrude(height=tile_th+plusth*2, convexity=10){
 132           circle(r=r);
 133           difference(){
 134             translate([-dx, -0.1])
 135               square([ dx*2, r/2 + 0.1 ]);
 136             for (xi = [-1, 1]) {
 137               translate([ xi*dx, r ])
 138                 circle(r=r);
 139             }
 140           }
 141         }
 142       }
 143     }
 144   }
 145 }
 146
 147 module InterlockNegative(this_cnr, right_cnr) {
 148   INREFFRAME(this_cnr, right_cnr)
 149     InterlockCore(interlock_negative_rad, 1, 0);
 150 }
 151
 152 module Interlock(this_cnr, right_cnr) {
 153   INREFFRAME(this_cnr, right_cnr)
 154     InterlockCore(interlock_rad, 0, 1);
 155 }
 156
 157 function TestPiece_holes2corners(holes) =
 158   [ holes[0] + thehd_bl,
 159     holes[1] + thehd_br,
 160     holes[0] + thehd_tl,
 161     holes[1] + thehd_tr ];
 162
 163 module TestPiece1(){ ////toplevel
 164   holes = [ [-100, 0],
 165             [   0, 0]
 166             ];
 167   corners = TestPiece_holes2corners(holes);
 168   difference(){
 169     TileBase(corners[0], corners[3]);
 170     InterlockNegative(corners[1], corners[3]);
 171   }
 172   Posts(holes);
 173   RoundEdge(corners[0], corners[1]);
 174   RoundEdge(corners[2], corners[0]);
 175   RoundLeftCorner(corners[0], corners[1]);
 176 }
 177
 178 module TestPiece2(){ ////toplevel
 179   holes = [ [   0, 0],
 180             [  50, 0]
 181             ];
 182   corners = TestPiece_holes2corners(holes);
 183   TileBase(corners[0], corners[3]);
 184   Posts(holes);
 185   RoundEdge(corners[0], corners[1]);
 186   Interlock(corners[2], corners[0]);
 187 }
 188
 189 module Demo(){ ////toplevel
 190   translate([ -thehd[0], 0 ])
 191     color("blue")
 192     TestPiece1();
 193   translate([ +thehd[0], 0 ])
 194     TestPiece2();
 195 }
 196
 197 //TestPiece1();
 198 //TestPiece2();
 199 //Demo();