X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=reprap-play.git;a=blobdiff_plain;f=cable-splice-clamp.scad;h=35d8be143ade70e29e1ca07c08de9a16c46c3124;hp=b1f6876979f7afd2fd6256a722e05a4c2fac545a;hb=d66c83a90d5552cad6773fff5b755f53aa4fd36d;hpb=2e81016db65692fd06fd31351ea8df75c2e51c72

diff --git a/cable-splice-clamp.scad b/cable-splice-clamp.scad
index b1f6876..35d8be1 100644
--- a/cable-splice-clamp.scad
+++ b/cable-splice-clamp.scad
@@ -1,34 +1,111 @@
 // -*- C -*-
 
+include <commitid.scad>
+
 cable_maxdia = 12;
 cable_mindia = 6;
+strap_width = 4 + 0.5;
+total_len = 70;
+
+wallmin = 1.5;
+
+strap_count = 2;
 
-wallmin = 1;
-wall = 2;
+strap_wall_h = 1.5;
+strap_wall_l = 2.0;
 
-delta_ellipse = 0.5;
+delta_ellipse = 0.45;
 
 // calculated
 
-outerdia = cable_maxdia / cos(30) + wall*2;
 delta_shift = 1 - delta_ellipse;
 
+roundoff_rad = cable_maxdia/2 * sqrt(delta_shift)
+	      + cable_mindia/2 * (1-sqrt(delta_shift));
+
+outerdia = 2*(roundoff_rad / cos(30) + wallmin);
+
+delta_shift_gap = (cable_maxdia-cable_mindia) * delta_shift;
+
+writing_dx = outerdia * sin(30);
+writing_dz = total_len / 3;
+
 module CrossSection(plus=0) {
   difference(){
     for (dx = [-plus, 0, plus])
       translate([dx, 0])
       circle(r= outerdia/2, $fn=6);
 
-    scale([cable_maxdia,
-	   cable_maxdia * delta_shift + cable_mindia * delta_ellipse])
-      circle(r= 0.5, $fn=30);
+    intersection(){
+      scale([cable_maxdia,
+	     cable_maxdia * delta_shift + cable_mindia * delta_ellipse])
+	circle(r= sqrt(0.5) * delta_shift + 0.5 * delta_ellipse, $fn=4);
+      circle(r= roundoff_rad, $fn=20);
+    }
 
-    square(center=true, [40, (cable_maxdia-cable_mindia) * delta_shift]);
+    square(center=true, [40, delta_shift_gap]);
   }
 }
 
-linear_extrude(height=20)
-  CrossSection(0);
+module CrossSectionDemo(){ ////toplevel
+  color("blue"){
+    translate([0, delta_shift_gap/2, 0]){
+      difference(){
+        circle(r = cable_maxdia/2, $fn=20);
+	circle(r = cable_mindia/2, $fn=20);
+      }
+    }
+  }
+  
+  linear_extrude(height=20)
+    CrossSection(0);
+
+  color("red")
+    linear_extrude(height=1)
+    CrossSection(2);
+}
+
+module CompleteClamp(){ ////toplevel
+  difference(){
+    union(){
+      linear_extrude(height=total_len)
+	CrossSection();
+
+      for (i=[0 : strap_count]){
+	if (i*2 != strap_count) {
+	  translate([0, 0,
+		     total_len * (i + 0.5) / (strap_count + 1)])
+	    for (m=[0,1]){
+	      mirror([0,0,m])
+		translate([0,0, strap_width/2])
+		linear_extrude(height=strap_wall_l)
+		CrossSection(strap_wall_h);
+	    }
+	}
+      }
+    }
+
+    for (my = [0,1]) {
+      mirror([0,my,0])
+	translate([-writing_dx/2,
+		   cos(30) * outerdia/2,
+		   (total_len - writing_dz)/2])
+	rotate([90,0,0])
+	Commitid_BestCount([writing_dx, writing_dz]);
+    }
+  }
+}
+
+module HalfPrint(){ ////toplevel
+  rotate([0,180,0]){
+    intersection(){
+      rotate([-90,0,-90])
+	CompleteClamp();
+      translate([-100,-100,0]) cube([1000,200,200]);
+    }
+  }
+}
 
-linear_extrude(height=1)
-  CrossSection(2);
+//CrossSectionDemo();
+//CompleteClamp();
+HalfPrint();