From 8356c42ef4e8816a43c0a74097ef600a8f60c21a Mon Sep 17 00:00:00 2001
From: Vitaliy Filippov <vitalif@yourcmc.ru>
Date: Thu, 5 Jun 2014 09:56:39 +0000
Subject: [PATCH] add rim base

---
 tire/tire_81.6_50.scad | 38 ++++++++++++++++++++++++++++----------
 1 file changed, 28 insertions(+), 10 deletions(-)

diff --git a/tire/tire_81.6_50.scad b/tire/tire_81.6_50.scad
index 6b6b7f9..a4e0009 100644
--- a/tire/tire_81.6_50.scad
+++ b/tire/tire_81.6_50.scad
@@ -3,34 +3,51 @@
 
 $fn=60;
 R=42; // outer radius
+R_I=26.5; // innermost radius
+B=2.5; // width of edge for the rim
+B_W=1.6; // thickness of edge for the rim
+B_P=4; // position of edge for the rim
 W=50; // tire width
 N_L=4; // number of lateral protectors
-N_A=20; // number of angular 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);
+  }
+}
+
+tire();
+
+module tire() {
 difference() {
   hull() {
     translate([0, 0, 2]) cylinder(r=R, h=W-4);
     cylinder(r=R-2, h=W);
   }
   // center hole through all piece
-  translate([0, 0, -0.5]) cylinder(r=26.5, h=W+1);
+  translate([0, 0, -0.5]) cylinder(r=R_I, h=W+1);
   // top hole
-  translate([0, 0, W-4]) cylinder(r=29, h=5);
+  translate([0, 0, W-B_P]) cylinder(r=R_I+B, h=B_P+1);
   hull() {
-    translate([0, 0, W-1.5]) cylinder(r=29, h=1.5);
-    translate([0, 0, W]) cylinder(r=30.5, h=1);
+    translate([0, 0, W-1.5]) cylinder(r=R_I+B, h=1.5);
+    translate([0, 0, W]) cylinder(r=R_I+B+1.5, h=1);
   }
   // bottom hole
-  translate([0, 0, -1]) cylinder(r=29, h=5);
+  translate([0, 0, -1]) cylinder(r=R_I+B, h=B_P+1);
   hull() {
-    translate([0, 0, 0]) cylinder(r=29, h=1.5);
-    translate([0, 0, -1]) cylinder(r=30.5, h=1);
+    translate([0, 0, 0]) cylinder(r=R_I+B, h=1.5);
+    translate([0, 0, -1]) cylinder(r=R_I+B+1.5, h=1);
   }
   // inside cut
-  translate([0, 0, 4+1.5]) cylinder(r=R-3, h=W-(4+1.5)*2);
+  translate([0, 0, B_P+B_W]) cylinder(r=R-3, h=W-(B_P+B_W)*2);
   difference() {
     translate([0, 0, 2.5]) cylinder(r=R-3, h=W-2.5*2);
-    cylinder(r=31, h=W);
+    cylinder(r=R_I+B+2, h=W);
   }
   // lateral protector
   for (i = [1 : N_L])
@@ -44,6 +61,7 @@ difference() {
   // to cut and look inside :)
   //translate([0, 0, -0.1]) cube(size=[100, 100,100]);
 }
+}
 
 module protector_single() {
   difference() {