cable-splice-clamp: a thing to print

[reprap-play.git] / cable-splice-clamp.scad

diff --git a/cable-splice-clamp.scad b/cable-splice-clamp.scad
index c561fcaa6d6dc124ee19c319c9f4d4abe811bf79..7533bcdf9ff4626741427e26bd6349948963a355 100644 (file)
--- a/cable-splice-clamp.scad
+++ b/cable-splice-clamp.scad
@@ -2,31 +2,90 @@
 
 cable_maxdia = 12;
 cable_mindia = 6;
+strap_width = 4 + 0.5;
+total_len = 70;
 
-wallmin = 1;
-wall = 2;
+wallmin = 1.5;
 
-delta_ellipse = 0.5;
+strap_count = 2;
+
+strap_wall_h = 1.5;
+strap_wall_l = 2.0;
+
+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;
+
 module CrossSection(plus=0) {
   difference(){
-    circle(r= outerdia/2 + plus, $fn=6);
+    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
+  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);
+       }
+    }
+  }
+}
+
+module HalfPrint(){ ////toplevel
+  intersection(){
+    rotate([-90,0,-90])
+      CompleteClamp();
+    translate([-100,-100,0]) cube([1000,200,200]);
+  }
+}
 
-linear_extrude(height=1)
-  CrossSection(2);
+//CrossSectionDemo();
+//CompleteClamp();
+HalfPrint();