move motor shaft z-size into its module

diff --git a/wheel.scad b/wheel.scad
index a3bb53aac8d6b9923d3f5a96bbebd73324679043..2ba290a5985de42f99fe0f43595b7421b0ad2bfe 100644 (file)
--- a/wheel.scad
+++ b/wheel.scad
@@ -8,15 +8,18 @@ wheel_depth = 6;
 wheel_radius = 68/2;
 
 module encoder_shaft(){
 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;
   motor_shaft_small = 4.8;

-  motor_shaft_length = wheel_depth / 2;
+  motor_shaft_length = wheel_depth * 3 / 4;

 
   intersection(){
     cylinder(h = motor_shaft_length,
              r = motor_shaft_big,
              center = true,
 
   intersection(){
     cylinder(h = motor_shaft_length,
              r = motor_shaft_big,
              center = true,

-             $fn=30);
+             $fn = 30);
+    // 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);}}
 
     cube([motor_shaft_big * 2.1, motor_shaft_small, motor_shaft_length],
          center = true);}}
 


@@ -28,7 +31,7 @@ module wheel(){
     difference(){
       cylinder(h = wheel_depth, r = wheel_radius, center = true, $fn = 30);
       translate([0, 0, wheel_depth / 4]){
     difference(){
       cylinder(h = wheel_depth, r = wheel_radius, center = true, $fn = 30);
       translate([0, 0, wheel_depth / 4]){

-        scale([1, 1, 2]){
+        scale([1, 1, 1.1]){

           encoder_shaft();}}
       mounting_screw();
       for(i = [1 : 5]){
           encoder_shaft();}}
       mounting_screw();
       for(i = [1 : 5]){