earring-stand: use FArcSegment

diff --git a/earring-stand.scad b/earring-stand.scad
index 52ad317946869a3588662580459b621df3ec7148..ace6c7a17274e84fc4743278b10bdc758c66baa9 100644 (file)
--- a/earring-stand.scad
+++ b/earring-stand.scad
@@ -6,18 +6,35 @@ eclip_prong_th = 3;
 eclip_outer_strt = 0.5;
 eclip_inner_xstrt = 0.5;
 
+eclip_ult_angle = 44;
+eclip_base_epsilon = 0.5;
+
 // calculated
 
+include <utils.scad>
+
 eclip_inner_strt = eclip_outer_strt + eclip_inner_xstrt;
 
 r0 = eclip_inner_rad;
 r1 = r0 + eclip_inner_rad;
 r2 = r1 + eclip_prong_th;
+r2e = r1 + eclip_base_epsilon;
+
+$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);
   }
 }