From fa4f59f538d27c3b8515ca6ec962f72cff1c968d Mon Sep 17 00:00:00 2001
From: Vitaliy Filippov <vitalif@yourcmc.ru>
Date: Sat, 7 Jun 2014 12:43:33 +0000
Subject: [PATCH] fix spacings, make spacing and fixing width also parameters,
 remove B2 parameter

---
 tire/tire_81.6_50.scad | 74 +++++++++++++++++++++++++-----------------
 1 file changed, 44 insertions(+), 30 deletions(-)

diff --git a/tire/tire_81.6_50.scad b/tire/tire_81.6_50.scad
index 0876f1c..07cae3d 100644
--- a/tire/tire_81.6_50.scad
+++ b/tire/tire_81.6_50.scad
@@ -12,8 +12,8 @@ THICKNESS=2.5;
 PROT_DEPTH=1;
 PROT_L_WIDTH=2;
 PROT_A_WIDTH=2;
+FIX_WIDTH=2;
 B=2.5; // width of edge for the rim
-B2=B+2;
 B_W=1.6; // thickness of edge for the rim
 B_P=4; // position of edge for the rim
 W=50; // tire width
@@ -25,8 +25,9 @@ CUT_BASE=8;
 CUT_ANGLE=12;
 CUT_I_R=1.5;
 CUT_O_R=2;
+SPACING=0.2;
 
-/*// 6-spoke variant
+// 6-spoke variant
 N_SPOKE=6;
 CUT_ANGLE=21;
 CUT_I_R=2.5;
@@ -37,57 +38,72 @@ N_L=2;
 R=22;
 BEVEL=1;
 THICKNESS=1.5;
+FIX_WIDTH=1;
 PROT_A_WIDTH=1;
 PROT_L_WIDTH=1;
-B=1.5;
-B2=B+0.5;
+B_P=3;
+B=1;
 R_I=15;
 CUT_O_R=1;
 CUT_BASE=5;
-W=20;*/
+W=20;
 
-translate([0, 0, W]) rotate([180, 0, 0]) {
-  rim();
+difference() {
+  union() {
+    translate([0, 0, W]) rotate([180, 0, 0]) {
+      rim();
 /*
-  // Support ...
-  translate([0, 0, SPOKE_THICKNESS+(R_I-2-CUT_BASE)/2+0.4]) cylinder(r=CUT_BASE, h=W-(SPOKE_THICKNESS+(R_I-2-CUT_BASE)/2+0.4));
-  translate([0, 0, W-(B_P-2-0.2)+0.4]) cylinder(r=R_I+B+2, h=(B_P-2-0.2)-0.4);
-  translate([0, 0, W-(B_P-2-0.2)-2-B+0.5+0.4]) difference() {
-    cylinder(r=R_I+B+2, h=(B_P-2-0.2)+2+B-0.5-0.4);
-    translate([0, 0, -0.5]) cylinder(r=R_I+B+0.4, h=1+(B_P-2-0.2)+2+B-0.5-0.4);
-  }
+      // Support ...
+      translate([0, 0, SPOKE_THICKNESS+(R_I-2-CUT_BASE)/2+SPACING]) cylinder(r=CUT_BASE, h=W-(SPOKE_THICKNESS+(R_I-2-CUT_BASE)/2+SPACING));
+      translate([0, 0, W-(B_P-FIX_WIDTH-SPACING)+SPACING]) cylinder(r=R_I+B+THICKNESS, h=(B_P-FIX_WIDTH-SPACING)-SPACING);
+      translate([0, 0, W-(B_P-FIX_WIDTH-SPACING)-2-B+SPACING]) difference() {
+        cylinder(r=R_I+B+THICKNESS, h=(B_P-FIX_WIDTH-SPACING)+2+B-SPACING);
+        translate([0, 0, -0.5]) cylinder(r=R_I+B+SPACING, h=1+(B_P-2-0.2)+2+B-SPACING);
+      }
 */
+    }
+    tire();
+  }
+  // to cut and look inside :)
+  translate([0, 0, -0.5]) cube(size=[R+10, R+10, W+1]);
 }
-tire();
 
 module rim() {
   color([0.5, 0.5, 1]) {
     difference() {
       union() {
-        cylinder(r=R_I-0.2, h=W-(B_P-2-0.2));
-        cylinder(r=R_I+B-0.5, h=2+(B_P-2-0.2));
-        translate([0, 0, W-(B_P-2-0.2)-2]) cylinder(r=R_I+B-0.5, h=2);
-        hull() {
-          translate([0, 0, (B_P-2-0.2)+B_P]) cylinder(r=R_I+B2, h=2);
-          translate([0, 0, (B_P-2-0.2)+B_P+B2+0.2]) cylinder(r=R_I-0.2, h=2);
+        cylinder(r=R_I-SPACING, h=W-(B_P-FIX_WIDTH-SPACING));
+        // outer fixing edges
+        cylinder(r=R_I+B-SPACING, h=FIX_WIDTH+(B_P-FIX_WIDTH-SPACING));
+        translate([0, 0, W-(B_P-FIX_WIDTH-SPACING)-FIX_WIDTH]) cylinder(r=R_I+B-SPACING, h=FIX_WIDTH);
+        // inner fixing edges, 45 degree slope for easier printing
+        translate([0, 0, FIX_WIDTH+(B_P-FIX_WIDTH-SPACING)+(B_W+SPACING)+SPACING]) hull() {
+          cylinder(r=R_I+B+THICKNESS, h=FIX_WIDTH);
+          translate([0, 0, B+THICKNESS+SPACING]) cylinder(r=R_I-SPACING, h=FIX_WIDTH);
         }
-        hull() {
-          translate([0, 0, W-(B_P-2-0.2)-6]) cylinder(r=R_I+B2, h=2);
-          translate([0, 0, W-(B_P-2-0.2)-6-B2-0.2]) cylinder(r=R_I-0.2, h=2);
+        translate([0, 0, W-(FIX_WIDTH+(B_P-FIX_WIDTH-SPACING)+(B_W+SPACING))-FIX_WIDTH-SPACING]) hull() {
+          cylinder(r=R_I+B+THICKNESS, h=FIX_WIDTH);
+          translate([0, 0, -(B+THICKNESS+SPACING)]) cylinder(r=R_I-SPACING, h=FIX_WIDTH);
         }
       }
+      // make spokes by cutting space between them
       for (i = [1 : N_SPOKE])
         rotate([0, 0, i*360/N_SPOKE]) rim_cut();
+      // cut spokes toroidally inside the rim
       translate([0, 0, SPOKE_THICKNESS+(R_I-2-CUT_BASE)/2])
         rotate_extrude(convexity = 10)
         translate([(R_I-2-CUT_BASE)/2+CUT_BASE, 0, 0]) circle(r = (R_I-2-CUT_BASE)/2);
+      // remove the rest of spokes
       translate([0, 0, SPOKE_THICKNESS+(R_I-2-CUT_BASE)/2]) cylinder(r=R_I-2, h=W);
+      // add axle hole at the center
       translate([0, 0, -0.5]) linear_extrude(height=W+1) axle();
-      translate([0, 0, -1]) cylinder(r=CUT_BASE-2, h=5+(B_P-2-0.2));
+      // add center cut around axle hole
+      translate([0, 0, -1]) cylinder(r=CUT_BASE-2, h=5+(B_P-FIX_WIDTH-SPACING));
+      // make spokes convex using another toroidal cut
       difference() {
-        translate([0, 0, -1]) cylinder(r=1+R_I+B-0.5/*R_I-2*/, h=1+(B_P-2-0.2));
-        translate([0, 0, (B_P-2-0.2)])
-          scale([1, 1, (B_P-2-0.2)/((R_I-2-CUT_BASE+2)/2)])
+        translate([0, 0, -1]) cylinder(r=1+R_I+B-0.5/*R_I-2*/, h=1+(B_P-FIX_WIDTH-SPACING));
+        translate([0, 0, (B_P-FIX_WIDTH-SPACING)])
+          scale([1, 1, (B_P-FIX_WIDTH-SPACING)/((R_I-2-CUT_BASE+2)/2)])
           rotate_extrude(convexity = 10)
           translate([(R_I-2-CUT_BASE+2)/2+CUT_BASE-2, 0, 0]) circle(r = (R_I-2-CUT_BASE+2)/2);
       }
@@ -149,8 +165,6 @@ difference() {
   // angular protector
   for (i = [1 : N_A])
     rotate([0, 0, 360/N_A*i]) protector_single();
-  // to cut and look inside :)
-  translate([0, 0, -0.5]) cube(size=[R+10, R+10, W+1]);
 }
 }