X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=earring-stand.scad;h=e3df5ac49ac68db3046ff23e5d56cbc2fce4224f;hb=f69e678e2d115bd4bbcc1018096bd83d79ce2245;hp=52ad317946869a3588662580459b621df3ec7148;hpb=c017d3a74554c3c40676c8d7d139b68f30a1f7c3;p=reprap-play.git

diff --git a/earring-stand.scad b/earring-stand.scad
index 52ad317..e3df5ac 100644
--- a/earring-stand.scad
+++ b/earring-stand.scad
@@ -1,24 +1,201 @@
 // -*- 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);
+echo("test_len",test_len);
+
 // calculated
 
+include <utils.scad>
+
 eclip_inner_strt = eclip_outer_strt + eclip_inner_xstrt;
 
 r0 = eclip_inner_rad;
-r1 = r0 + eclip_inner_rad;
+r1 = r0 + eclip_gap_rad;
 r2 = r1 + eclip_prong_th;
+r2e = r1 + eclip_base_epsilon;
+
+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;
+
+$fn=70;
 
 module EclipLPlanCore(alpha){
+  FArcSegment(0,0, r1,r2,
+	      180-eclip_ult_angle, eclip_ult_angle-alpha +1);
+
   difference(){
-    circle(r = r2);
-    circle(r = r1);
+    hull(){
+      intersection(){
+	circle(r2);
+	rotate(-alpha) mirror([1,1]) square([r2e, 50]);
+     }
+      rotate(-alpha) mirror([1,1]) square([r2e, r2]);
+    }
+    circle(r1);
+  }
+}
+
+module EclipRPlan(alpha, main_th){
+  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){
+  rotate(alpha) EclipLPlanCore(alpha);
+}
+
+module EclipPPlan(main_th){
+  intersection(){
+    hull(){
+      circle(r0);
+      rotate(90-eclip_ult_angle) square([r0,r0]);
+    }
+    translate([-(r0+.1), -(r0+.1)])
+      square([(r0+.1) + main_th + ppxl, r2*2]);
   }
+  translate([ppxl, 0]) square([main_th, r2]);
+}
+
+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[0], uf[1]];
+
+pp = [0, 0];
+pq = pp + uf*front_height + ur*eclip_ra_offset;
+pr = [ pq[0] - eclip_base_offset + eclip_wall_offset, 0 ];
+
+module Sketch(){
+  polygon([pq, pp, pr]);
+}
+
+thicks = [ 2, 2, 2 ];
+
+module Joins(alpha, objnum, objnum_f, objnum_m) {
+  echo("Joins",objnum, objnum_f, objnum_m);
+  thm = thicks[objnum_m];
+  if (objnum==objnum_f) {
+    EclipLPlan(alpha);
+    EclipRPlan(alpha, thm);
+  }
+  if (objnum==objnum_m)
+    rotate(alpha)
+      EclipPPlan(thm);
+}
+
+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);
+}
+
+module Base(){
+  ObjectJoins(0);
+}
+
+module Front(){
+  ObjectJoins(1);
+}
+
+module Back(){
+  ObjectJoins(2);
+}
+
+module Demo(){
+  Base();
+  Front();
+  Back();
 }
 
-EclipLPlanCore(10);
+//PlanDemo();
+//TestBase();
+//TestProtr();
+//TestRAProtr();
+//Sketch();
+//Demo();