add central rod retainer

1 files changed, 20 insertions, 0 deletions

diff --git a/con_bar_v.scad b/con_bar_v.scad
index 6ef6ec2..7e609e6 100644
--- a/con_bar_v.scad
+++ b/con_bar_v.scad
@@ -1,6 +1,9 @@
 bar_width = 4;
 bar_height = 20;
 
+rod_rad = 5;
+rod_bury = 10; // how deep the rod sticks in its retainer
+
 clamp_thick = 5;
 clamp_l1 = 10;
 clamp_l2 = 50;
@@ -12,6 +15,7 @@ angle = 30; // fake value; TODO
 
 clamp_width = 2 * clamp_thick + bar_width;
 clamp_height = bar_height + clamp_thick;
+clamp_length = clamp_l2 - clamp_l1;
 
 module strut(num, r1, r2, h) {
  a = 360 / num;
@@ -37,6 +41,21 @@ module clamp() {
  }
 }
 
+module rod_retainer(h) {
+  $fs = 0.1;
+  difference() {
+    union() {
+      cylinder(h=h, r=rod_rad + strut_thick);
+
+      translate([0, -strut_thick/2, 0])
+      cube([clamp_l1, strut_thick, h]);
+    }
+
+    translate([0, 0, max(strut_thick, h - rod_bury)])
+    cylinder(h=h, r=rod_rad);
+  }
+}
+
 module con(num) {
   for (i = [0:num-1])
     rotate(i*360/num) {
@@ -45,6 +64,7 @@ module con(num) {
       strut(num, clamp_l2, clamp_l2 - strut_height, strut_thick);
       strut(num, clamp_l2, clamp_l2 - strut_thick, strut_height);
     }
+  rod_retainer(max(clamp_thick, clamp_length * sin(angle)));
 }
 
 con(3);