From 30a44d4eb3d19ff4e96652e7a15cd312ad15e549 Mon Sep 17 00:00:00 2001
From: Vitaliy Filippov <vitalif@yourcmc.ru>
Date: Thu, 5 Jun 2014 16:03:44 +0000
Subject: [PATCH] rim cuts

---
 tire/tire_81.6_50.scad | 38 ++++++++++++++++++++++++++++++--------
 1 file changed, 30 insertions(+), 8 deletions(-)

diff --git a/tire/tire_81.6_50.scad b/tire/tire_81.6_50.scad
index a4e0009..67cca1a 100644
--- a/tire/tire_81.6_50.scad
+++ b/tire/tire_81.6_50.scad
@@ -11,17 +11,39 @@ W=50; // tire width
 N_L=4; // number of lateral protectors
 N_A=10; // number of angular protectors
 
-translate([0, 0, B_P-2-0.2]) color([0.5, 0.5, 1]) {
-  union() {
-    cylinder(r=R_I-0.2, h=W-2*(B_P-2-0.2));
-    cylinder(r=R_I+B-0.5, h=2);
-    translate([0, 0, W-2*(B_P-2-0.2)-2]) cylinder(r=R_I+B-0.5, h=2);
-    translate([0, 0, B_P]) cylinder(r=R_I+B+2, h=2);
-    translate([0, 0, W-2*(B_P-2-0.2)-6]) cylinder(r=R_I+B+2, h=2);
+rim();
+tire();
+
+module rim() {
+  translate([0, 0, B_P-2-0.2]) color([0.5, 0.5, 1]) {
+    difference() {
+      union() {
+        cylinder(r=R_I-0.2, h=W-2*(B_P-2-0.2));
+        cylinder(r=R_I+B-0.5, h=2);
+        translate([0, 0, W-2*(B_P-2-0.2)-2]) cylinder(r=R_I+B-0.5, h=2);
+        translate([0, 0, B_P]) cylinder(r=R_I+B+2, h=2);
+        translate([0, 0, W-2*(B_P-2-0.2)-6]) cylinder(r=R_I+B+2, h=2);
+      }
+      for (i = [1 : 8]) rotate([0, 0, i*45]) rim_cut();
+      translate([0, 0, -0.5]) cylinder(r=2.5, h=W+1);
+    }
   }
 }
 
-tire();
+module rim_cut() {
+  translate([5, 0, -0.5]) linear_extrude(height=W+1) {
+    hull() {
+      circle(r=1);
+      rotate([0, 0, 15]) translate([R_I-2-5-3, 0, 0]) circle(r=3);
+      rotate([0, 0, -15]) translate([R_I-2-5-3, 0, 0]) circle(r=3);
+    }
+    difference() {
+      circle(r=R_I-2-5);
+      rotate([0, 0, 15]) translate([-50, 0]) square(size=[100, 30]);
+      rotate([0, 0, -15]) translate([-50, -30]) square(size=[100, 30]);
+    }
+  }
+}
 
 module tire() {
 difference() {