X-Git-Url: http://challenge-bot.com/repos/?a=blobdiff_plain;f=wheel.scad;h=87ec2865c38c456da267159bce0b19b41291c92d;hb=2b2202ff20d0fc729637c5191e9481260b0e8eac;hp=2ba290a5985de42f99fe0f43595b7421b0ad2bfe;hpb=6af76e9d99aaacefde6229c1c51721763b1edfd5;p=challenge-bot

diff --git a/wheel.scad b/wheel.scad
index 2ba290a..87ec286 100644
--- a/wheel.scad
+++ b/wheel.scad
@@ -4,32 +4,34 @@
 // https://gitorious.org/ozzloy/challenge-bot
 // https://github.com/waynegramlich/challenge-bot
 
+// use $fn = 20 while developing, 100 when about to print
+//  20 will make previews fast
+//  100 will make printing smooth
+$fn = 20;
+
 wheel_depth = 6;
 wheel_radius = 68/2;
 
 module encoder_shaft(){
   // measured with calipers, checked against the motor shaft
-  motor_shaft_big = 3.7;
-  motor_shaft_small = 4.8;
+  motor_shaft_big = 3.7; // radius, gets doubled in cylinder
+  motor_shaft_small = 4.8; // total length of box
   motor_shaft_length = wheel_depth * 3 / 4;
 
   intersection(){
-    cylinder(h = motor_shaft_length,
-             r = motor_shaft_big,
-             center = true,
-             $fn = 30);
+    cylinder(h = motor_shaft_length, r = motor_shaft_big, center = true);
     // x direction is multiplied by 2 because the radius of the cylinder
     // goes in both directions.  the extra .1 is for overlap
     cube([motor_shaft_big * 2.1, motor_shaft_small, motor_shaft_length],
          center = true);}}
 
 module mounting_screw(){
-  cylinder(h = wheel_depth * 1.1, r = 1, $fn = 30, center = true);}
+  cylinder(h = wheel_depth * 1.1, r = 1, center = true);}
 
 module wheel(){
   translate([0, 0, wheel_depth / 2]){
     difference(){
-      cylinder(h = wheel_depth, r = wheel_radius, center = true, $fn = 30);
+      cylinder(h = wheel_depth, r = wheel_radius, center = true);
       translate([0, 0, wheel_depth / 4]){
         scale([1, 1, 1.1]){
           encoder_shaft();}}
@@ -66,6 +68,6 @@ module pie_slice(){
 module between_spokes(){
   minkowski(){
     pie_slice();
-    cylinder(h = wheel_depth / 2, r = 1, $fn = 30);}}
+    cylinder(h = wheel_depth / 2, r = 1);}}
 
 wheel();