X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=earring-stand.scad;h=1a5f204e49a6dd92e1994dca419bb55696190419;hb=fbda336643dfb1929a1298531d3d096dfad7a50d;hp=4c64e84c3df40d93ffb677f7d536b44a71eb27bb;hpb=d6399277d616e47a400337c0224e1fa96592a03f;p=reprap-play.git

diff --git a/earring-stand.scad b/earring-stand.scad
index 4c64e84..1a5f204 100644
--- a/earring-stand.scad
+++ b/earring-stand.scad
@@ -7,8 +7,8 @@ front_width = 120;
 front_setback = 30;
 
 eclip_inner_rad = 2.5;
-eclip_gap_rad = 0.5;
-eclip_prong_th = 3;
+eclip_gap_rad = 0.1;
+eclip_prong_th = 2.25;
 eclip_outer_strt = 0.5;
 eclip_inner_xstrt = 0.5;
 
@@ -16,7 +16,7 @@ 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 +24,8 @@ 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 +46,9 @@ eclip_wall_offset = -ppxl;
 
 eclip_ra_offset = r2 - 0.1;
 
+eclip_rhs_offset = ppxl + rgap + eclip_prong_th;
+// does not include main_th
+
 $fn=70;
 
 module EclipLPlanCore(alpha){
@@ -90,13 +95,13 @@ 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)
@@ -143,47 +148,96 @@ 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 ];
 
+echo("uf ur P Q R", uf, ur, pp, pq, pr);
+
 module Sketch(){
   polygon([pq, pp, pr]);
 }
 
 thicks = [ 2, 2, 2 ];
 
-//side_origins = [ pp, 
-
 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);
 }
 
-module Object(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);
+function r3(pc) = [ pc[0], 0, pc[1] ];
+
+module ObjectJoins(objnum){
+  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(){
+  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 Base(){ Object(0); }
-module Front(){ Object(1); }
-module Back(){ Object(2); }
+module Front(){
+  %ObjectJoins(1);
+  rotate([0, 90-beta, 0])
+    translate([0, 0, ppxl])
+    rotate([0,0,90])
+    cube([front_width, front_height, thicks[1]]);
+}
+
+module Back(){
+  ObjectJoins(2);
+}
 
 module Demo(){
-  Base();
-  Front();
-  Back();
+  color("red") Base();
+  color("blue") Front();
+  color("black") Back();
 }
 
 //PlanDemo();