X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=reprap-play.git;a=blobdiff_plain;f=earring-stand.scad;h=1a5f204e49a6dd92e1994dca419bb55696190419;hp=53c98406970b67e9f4454cbfd1ead68877585546;hb=fbda336643dfb1929a1298531d3d096dfad7a50d;hpb=1764fe36d6e96b8274b63eaa0911fcde9b1bb7e1

diff --git a/earring-stand.scad b/earring-stand.scad
index 53c9840..1a5f204 100644
--- a/earring-stand.scad
+++ b/earring-stand.scad
@@ -1,16 +1,30 @@
 // -*- C -*-
 
+include <commitid.scad>
+
+front_height = 80;
+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;
 
 eclip_ult_angle = 44;
 eclip_base_epsilon = 0.5;
 
+eclip_each_len = 6;
+eclip_each_every = 29;
+
 test_alpha = 10;
 test_main_th = 1.5;
+test_eclips = 5;
+test_base_th = 2.5;
+test_len = eclip_each_len + eclip_each_every*(test_eclips-1);
+
+num_eclips = 5;
 
 // calculated
 
@@ -27,6 +41,14 @@ ppxl = -(r0 / sqrt(2)) + (eclip_inner_strt / sqrt(2));
 
 rgap = eclip_gap_rad;
 
+eclip_base_offset = r1;
+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){
@@ -46,9 +68,13 @@ module EclipLPlanCore(alpha){
 }
 
 module EclipRPlan(alpha, main_th){
-  rotate(alpha)
-    translate([ppxl + main_th + rgap, -r2*2])
-    square([eclip_prong_th, r2*(2 + 1/sqrt(2))]);
+  intersection(){
+    rotate(alpha)
+      translate([ppxl + main_th + rgap, -r2*2])
+      square([eclip_prong_th, r2*(2 + 1/sqrt(2))]);
+    translate([-r2, -r2e])
+      square([r2*3, eclip_base_epsilon + r2*4]);
+  }
 }
 
 module EclipLPlan(alpha){
@@ -67,8 +93,156 @@ module EclipPPlan(main_th){
   translate([ppxl, 0]) square([main_th, r2]);
 }
 
-rotate(-test_alpha){
-color("red") EclipLPlan(test_alpha);
-color("blue") rotate(test_alpha) EclipPPlan(test_main_th);
-color("green") EclipRPlan(test_alpha, test_main_th);
+module TestBase(){ ////toplevel
+  translate([0,0, eclip_base_offset]){
+    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=[0 : 2: test_eclips-1]) {
+      translate([0, j*eclip_each_every])
+	rotate([90,0,0])
+	linear_extrude(height=eclip_each_len)
+	EclipRPlan(test_alpha, test_main_th);
+    }
+  }
+  translate([-r2, -eclip_each_len, -test_base_th]){
+    difference(){
+      cube([r2*2,
+	    test_len,
+	    test_base_th]);
+      mirror([0,0,1]) Commitid_BestCount_M([r2*2, test_len]);
+    }
+  }
+}
+
+module TestProtr(){ ////toplevel
+  difference(){
+    translate([0,0, test_main_th - eclip_wall_offset])
+      rotate([0,90,0])
+      linear_extrude(height=test_len)
+      EclipPPlan(test_main_th);
+    mirror([0,0,1]) Commitid_BestCount_M([test_len, r2]);
+  }
+}
+
+module TestRAProtr(){ ////toplevel
+  rotate([-90,0,0]) TestProtr();
+  mirror([1,0,0])
+    translate([-test_len,
+	       -r2,
+	       -(eclip_ra_offset + test_base_th)])
+    cube([test_len,
+	  r2*2,
+	  test_base_th]);
+}
+
+module TestPlanDemo(){
+  color("red") EclipLPlan(test_alpha);
+  color("blue") rotate(test_alpha) EclipPPlan(test_main_th);
+  color("green") EclipRPlan(test_alpha, test_main_th);
 }
+
+beta = asin(front_setback / front_height);
+
+uf = [-sin(beta), cos(beta)];
+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 ];
+
+module Joins(alpha, 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) {
+    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)
+    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){
+  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 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(){
+  color("red") Base();
+  color("blue") Front();
+  color("black") Back();
+}
+
+//PlanDemo();
+//TestBase();
+//TestProtr();
+//TestRAProtr();
+//Sketch();
+Demo();