sewing-table: Interlock: tongue/groove wip (nfc)

[reprap-play.git] / sewing-table.scad.m4

diff --git a/sewing-table.scad.m4 b/sewing-table.scad.m4
index 9880e2bae0dc6fabbb5554b9da67ced22880121a..b09d59a53d0a615d63453e7c245081fb62c294a5 100644 (file)
--- a/sewing-table.scad.m4
+++ b/sewing-table.scad.m4
@@ -19,6 +19,12 @@ screw_big_len = 4.0;
 round_edge_rad = 2.0;
 
 interlock_dia = 10;
+interlock_fine = 0.66;
+
+interlock_fine_slope = 1.0;
+interlock_fine_lenslop = 1.0;
+
+demo_slop = 0.1;
 
 // calculated
 
@@ -44,6 +50,8 @@ thehd_br = -thehd_tl;
 interlock_rad = interlock_dia/2;
 interlock_negative_rad = interlock_rad + 0.125;
 
+interlock_sq_adj = 0.2; // arbitrary
+
 module Post(){
   mirror([0,0,1]) {
     difference(){
@@ -121,11 +129,14 @@ module RoundLeftCorner(this_cnr, right_cnr) {
   }
 }
 
-module InterlockLobePlan(r, ymir) {
+module InterlockLobePlan(negative) {
+  r = negative ? interlock_negative_rad : interlock_rad;
+  ymir = negative ? 0 : 1;
+
   dx = sqrt(3) * r;
   $fn= 80;
   translate([thehd[0], 0]){
-    mirror([0,ymir,0]){
+    mirror([0,ymir]){
       circle(r=r);
       difference(){
        translate([-dx, -0.1])
@@ -139,25 +150,47 @@ module InterlockLobePlan(r, ymir) {
   }
 }
 
-module InterlockLobeCore(negative=0) {
-  r = negative ? interlock_negative_rad : interlock_rad;
-  plusth = negative * 1.0;
-  ymir = negative ? 0 : 1;
-  translate([0, 0, plusth]){
-    mirror([0,0,1]){
-      linear_extrude(height=tile_th+plusth*2, convexity=10){
-       InterlockLobePlan(r, ymir);
-      }
+module InterlockEdgePlan(negative, nlobes, length) {
+  for (lobei = [ 0 : nlobes-1 ]) {
+    lobex = (length - thehd[0]*2) * (lobei ? lobei / (nlobes-1) : 0);
+    translate([lobex, 0, 0]) {
+      InterlockLobePlan(negative);
     }
   }
+
+  iadj = interlock_sq_adj;
+  slotshorter = negative ? 0 : interlock_fine_lenslop;
+  mirror([0, negative])
+    translate([slotshorter, iadj])
+    square([length - slotshorter*2, interlock_fine + iadj*2]);
 }
 
 module InterlockEdge(left_cnr, right_cnr, negative=0, nlobes=2) {
+  plusth = negative * 1.0;
+  protr = interlock_fine + interlock_sq_adj;
+
+  z2 = -tile_th/2;
+  z1 = -tile_th/2 - protr / interlock_fine_slope;
+  z3 = -tile_th/2 + protr / interlock_fine_slope;
+
   INREFFRAME(left_cnr, right_cnr) {
-    for (lobei = [ 0 : nlobes-1 ]) {
-      lobex = (length - thehd[0]*2) * (lobei ? lobei / (nlobes-1) : 0);
-      translate([lobex, 0, 0])
-       InterlockLobeCore(negative);
+    for (vsect = [ // zs0            zs1      ys0,            ys1
+                 [ -tile_th-plusth, plusth,  0,              0],
+                 [ z1,              z2,      0, protr],
+                 [ z2,              z3,      protr, 0],
+                 ]) {
+      zs0 = vsect[0];
+      zs1 = vsect[1];
+      zsd = zs1-zs0;
+      ys0 = vsect[2];
+      ys1 = vsect[2];
+      ysd = ys1-ys0;
+      multmatrix([ [ 1,0,0,0 ],
+                  [ 0,1,0,0 ],
+                  [ 0,0,1,zs0 ],
+                  [ 0,0,0,1 ] ])
+       linear_extrude(height=zsd, convexity=10)
+       InterlockEdgePlan(negative, nlobes, length);
     }
   }
 }
@@ -198,7 +231,7 @@ module TestDemo(){ ////toplevel
   translate([ -thehd[0], 0 ])
     color("blue")
     TestPiece1();
-  translate([ +thehd[0], 0 ])
+  translate([ +thehd[0] + demo_slop, 0 ])
     TestPiece2();
 }
   
@@ -221,12 +254,13 @@ module Tile02(){ ////toplevel
   posts = Rectangle_corners2posts(c);
   difference(){
     TileBase(c[0], c[2]);
+    InterlockEdge(c[1], c[2], 1);
   }
   Posts(posts);
   RoundEdge(c[0], c[1]);
   RoundEdge(c[3], c[0]);
   RoundLeftCorner(c[0], c[1]);
-  InterlockEdge(c[2], c[3], 0, 2);
+  InterlockEdge(c[2], c[3], 0);
 }
 
 module Tile12(){ ////toplevel
@@ -236,6 +270,7 @@ module Tile12(){ ////toplevel
   posts = Rectangle_corners2posts(c);
   difference(){
     TileBase(c[0], c[2]);
+    InterlockEdge(c[0], c[1], 1);
   }
   Posts(posts);
   RoundEdge(c[2], c[3]);
@@ -244,8 +279,8 @@ module Tile12(){ ////toplevel
 }
 
 module Demo(){ ////toplevel
-  color("blue") Tile12();
-  color("red")  Tile02();
+  translate(demo_slop*[-2,1]) color("blue") Tile12();
+  translate(demo_slop*[-2,0]) color("red")  Tile02();
 }
   
 //TestPiece1();