spool-bearing.scad

   1 eps = 0.01;
   2
   3 bearing_d = 32 + 0.3;
   4 spool_d = 52.5 - 0.3;
   5
   6 cyl_wall = 1.5;
   7 body_h = 8 + cyl_wall;
   8 bearing_side = 2;
   9
  10
  11 difference() {
  12         cylinder(r = bearing_d/2 + 2*cyl_wall, h = body_h, $fn = 256);
  13         difference() {
  14                 translate([0, 0, cyl_wall])
  15                         cylinder(r = bearing_d/2 + cyl_wall, h = body_h, $fn = 256);
  16                 for (a = [0:60:360]) rotate([0, 0, a])
  17                         translate([bearing_d/2 + cyl_wall, 0, 0])
  18                                 cylinder(r = cyl_wall, h = body_h, $fn = 4);
  19         }
  20         translate([0, 0, -eps])
  21                 cylinder(r = bearing_d/2 - bearing_side, h = cyl_wall+2*eps,
  22                         $fn = 256);
  23 }
  24
  25 difference() {
  26         cylinder(r = spool_d/2, h = body_h, $fn = 256);
  27         translate([0, 0, -eps])
  28                 cylinder(r = spool_d/2-cyl_wall, h = body_h + 2*eps, $fn = 256);
  29 }
  30 for (a = [0:60:360]) {
  31         rotate([0, 0, a])
  32         translate([bearing_d/2, -cyl_wall, 0])
  33                 cube([spool_d/2-bearing_d/2 - cyl_wall/2,
  34                         2*cyl_wall, cyl_wall]);
  35 }