X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=reprap-play.git;a=blobdiff_plain;f=earring-stand.scad;h=8a77ed41ad7d248632651acafd00066c1e5c074c;hp=b2c001cee167d753f08b0bb250d6a5d68b99a2dd;hb=5690477540306b436a230a55fc43c86cc51c9c13;hpb=b5f5c242142fd38f81fca080d5c85ae8902d6b5f

diff --git a/earring-stand.scad b/earring-stand.scad
index b2c001c..8a77ed4 100644
--- a/earring-stand.scad
+++ b/earring-stand.scad
@@ -5,6 +5,15 @@ include <commitid.scad>
 front_height = 80;
 front_width = 120;
 front_setback = 30;
+front_thick = 2;
+
+front_hex_stride = 20;
+front_hex_dia = 10;
+
+back_thick = 3;
+back_pillarw = 6;
+
+base_thick = 2;
 
 eclip_inner_rad = 2.5;
 eclip_gap_rad = 0.1;
@@ -16,7 +25,7 @@ eclip_ult_angle = 44;
 eclip_base_epsilon = 0.5;
 
 eclip_each_len = 6;
-eclip_each_every = 15;
+eclip_each_every = 29;
 
 test_alpha = 10;
 test_main_th = 1.5;
@@ -24,6 +33,8 @@ test_eclips = 5;
 test_base_th = 2.5;
 test_len = eclip_each_len + eclip_each_every*(test_eclips-1);
 
+num_eclips = 5;
+
 // calculated
 
 include <utils.scad>
@@ -44,6 +55,11 @@ eclip_wall_offset = -ppxl;
 
 eclip_ra_offset = r2 - 0.1;
 
+eclip_recept_height = r2;
+
+eclip_rhs_offset = ppxl + rgap + eclip_prong_th;
+// does not include main_th
+
 $fn=70;
 
 module EclipLPlanCore(alpha){
@@ -90,13 +106,13 @@ module EclipPPlan(main_th){
 
 module TestBase(){ ////toplevel
   translate([0,0, eclip_base_offset]){
-    for (i=[0 : 2: test_eclips-1]) {
+    for (i=[1 : 2: test_eclips-2]) {
       translate([0, i*eclip_each_every])
 	rotate([90,0,0])
 	linear_extrude(height=eclip_each_len)
 	EclipLPlan(test_alpha);
     }
-    for (j=[1 : 2: test_eclips-2]) {
+    for (j=[0 : 2: test_eclips-1]) {
       translate([0, j*eclip_each_every])
 	rotate([90,0,0])
 	linear_extrude(height=eclip_each_len)
@@ -143,53 +159,138 @@ module TestPlanDemo(){
 beta = asin(front_setback / front_height);
 
 uf = [-sin(beta), cos(beta)];
-ur = [-uf[0], uf[1]];
+ur = [ -uf[1], uf[0]];
 
 pp = [0, 0];
 pq = pp + uf*front_height + ur*eclip_ra_offset;
-pr = [ pq[0] - eclip_base_offset + eclip_wall_offset, 0 ];
+pr = [ pq[0] - eclip_base_offset - eclip_wall_offset,
+       0 ];
+
+echo("uf ur P Q R", uf, ur, pp, pq, pr);
 
 module Sketch(){
   polygon([pq, pp, pr]);
 }
 
-thicks = [ 2, 2, 2 ];
+thicks = [ base_thick, front_thick, back_thick ];
 
 module Joins(alpha, objnum, objnum_f, objnum_m) {
-  echo("Joins",objnum, objnum_f, objnum_m);
+  pitch = (front_width - eclip_each_len) / (num_eclips-1);
+  
   thm = thicks[objnum_m];
+  stride = (front_width - eclip_each_len) / (num_eclips-1);
+
   if (objnum==objnum_f) {
-    EclipLPlan(alpha);
-    EclipRPlan(alpha, thm);
+    for (i=[ 1 : 2 : num_eclips-1 ]) {
+      translate([0, i*stride + eclip_each_len, 0]) {
+	rotate([90,0,0])
+	linear_extrude(height=eclip_each_len)
+	  EclipLPlan(alpha);
+      }
+    }
+    for (i=[ 0 : 2 : num_eclips-1 ]) {
+      translate([0, i*stride + eclip_each_len, 0]) {
+	rotate([90,0,0])
+	linear_extrude(height=eclip_each_len)
+	  EclipRPlan(alpha, thm);
+      }
+    }
   }
   if (objnum==objnum_m)
-    rotate(alpha)
+    mirror([0,1,0])
+      rotate([90,0,0])
+      linear_extrude(height=front_width)
+      rotate(alpha)
       EclipPPlan(thm);
 }
 
+function r3(pc) = [ pc[0], 0, pc[1] ];
+
 module ObjectJoins(objnum){
-  echo("Object",objnum);
-  translate(pp)                   Joins(beta, objnum, 0,1);
-  translate(pr) mirror([1,0,0])   Joins(0,    objnum, 0,2);
-  translate(pq) rotate([0,0,-90]) Joins(beta, objnum, 2,1);
+  translate(r3(pp))                   Joins(beta, objnum, 0,1);
+  translate(r3(pr)) mirror([1,0,0])   Joins(0,    objnum, 0,2);
+  translate(r3(pq)) rotate([0,90,0]) mirror([1,0,0]) Joins(-beta, objnum, 2,1);
 }
 
 module Base(){
-  ObjectJoins(0);
+  xmin = pr[0] - eclip_rhs_offset - thicks[2];
+  xmax = pp[0] + eclip_rhs_offset + thicks[1]
+    + eclip_prong_th * (1/cos(beta) - 1)
+    + eclip_base_offset * tan(beta);
+  intersection(){
+    ObjectJoins(0);
+    translate([xmin,
+	       -1,
+	       -50])
+      cube([xmax - xmin,
+	    front_width + 2,
+	    300]);
+  }
+  translate([xmin,
+	     0,
+	     -eclip_base_offset - thicks[0]])
+    cube([xmax - xmin,
+	  front_width,
+	  thicks[0]]);
+}
+
+module FrontPattern(){
+  ystride = front_hex_stride;
+  xstride = front_hex_stride * cos(30) * 2;
+  difference(){
+    square([front_width,
+	    front_height - eclip_wall_offset + thicks[1]]);
+    for (xi=[ 0 : 10 ])
+      translate([xi * xstride, 0])
+      for (yi=[ 0 : 10 ])
+	translate([0, yi * ystride])
+	for (dv=[ [0,0],
+		  [xstride/2, ystride/2]
+		  ])
+	  translate(dv)
+	    circle(r= front_hex_dia/2, $fn=6);
+  }
 }
 
 module Front(){
   ObjectJoins(1);
+  rotate([0, 90-beta, 0])
+    translate([0, 0, ppxl])
+    rotate([0,0,90]) {
+    linear_extrude(height=thicks[1])
+      FrontPattern();
+  }
 }
 
 module Back(){
   ObjectJoins(2);
+
+  zmin = pr[1];
+  zmax = pq[1] + eclip_prong_th;
+  height = zmax - zmin;
+
+  translate([pr[0] + eclip_wall_offset - thicks[2],
+	     0, 0])
+    rotate([0,90,0])
+    rotate([0,0,90]) {
+    difference(){
+      cube([front_width,
+	    height,
+	    thicks[2]]);
+      translate([back_pillarw,
+		 eclip_recept_height,
+		 -10])
+	cube([front_width - back_pillarw*2,
+	      height - eclip_recept_height*2 - eclip_prong_th,
+	      20]);
+    }
+  }
 }
 
 module Demo(){
-  Base();
-  Front();
-  Back();
+  color("red") Base();
+  color("blue") Front();
+  color("black") Back();
 }
 
 //PlanDemo();