scad/bearing.scad

   1 // PRUSA iteration3
   2 // Bearing holders
   3 // GNU GPL v3
   4 // Josef Průša <iam@josefprusa.cz> and contributors
   5 // http://www.reprap.org/wiki/Prusa_Mendel
   6 // http://prusamendel.org
   7 // Alterations for Wilson by MRice <mrice411@gmail.com>
   8
   9 bearing_diameter = 15;
  10
  11 module horizontal_bearing_base(bearings=1){
  12  translate(v=[0,0,6]) cube(size = [24,8+bearings*25,12], center = true);
  13 }
  14 module horizontal_bearing_holes(bearings=1){
  15  cutter_lenght = 10+bearings*25;
  16  one_holder_lenght = 8+25;
  17  holder_lenght = 8+bearings*25;
  18
  19  // Main bearing cut
  20  difference(){
  21   translate(v=[0,0,12]) rotate(a=[90,0,0]) translate(v=[0,0,-cutter_lenght/2]) cylinder(h = cutter_lenght, r=bearing_diameter/2, $fn=50);
  22   // Bearing retainers
  23   translate(v=[0,1-holder_lenght/2,3]) cube(size = [24,6,8], center = true);
  24   translate(v=[0,-1+holder_lenght/2,3]) cube(size = [24,6,8], center = true);
  25  }
  26
  27  // Ziptie cutouts
  28  ziptie_cut_ofset = 0;
  29  for ( i = [0 : bearings-1] ){
  30   // For easier positioning I move them by half of one
  31   // bearing holder then add each bearign lenght and then center again
  32   translate(v=[0,-holder_lenght/2,0]) translate(v=[0,one_holder_lenght/2+i*25,0]) difference(){
  33    union(){
  34     translate(v=[0,2-6,12]) rotate(a=[90,0,0]) translate(v=[0,0,0]) cylinder(h = 4, r=12.5, $fn=50);
  35     translate(v=[0,2+6,12]) rotate(a=[90,0,0]) translate(v=[0,0,0]) cylinder(h = 4, r=12.5, $fn=50);
  36    }
  37    translate(v=[0,10,12]) rotate(a=[90,0,0]) translate(v=[0,0,0]) cylinder(h = 24, r=10, $fn=50);
  38   }
  39  }
  40
  41 }
  42
  43 module horizontal_bearing_test(){
  44  difference(){
  45   horizontal_bearing_base(1);
  46   horizontal_bearing_holes(1);
  47  }
  48  translate(v=[30,0,0]) difference(){
  49   horizontal_bearing_base(2);
  50   horizontal_bearing_holes(2);
  51  }
  52  translate(v=[60,0,0]) difference(){
  53   horizontal_bearing_base(3);
  54   horizontal_bearing_holes(3);
  55  }
  56 }
  57
  58
  59
  60 thinwall = 3;
  61 bearing_size = bearing_diameter + 2 * thinwall;
  62
  63 module vertical_bearing_base(){
  64  translate(v=[-2-bearing_size/4,0,29]) cube(size = [4+bearing_size/2,bearing_size,58], center = true);
  65  cylinder(h = 58, r=bearing_size/2, $fn = 90);
  66 }
  67
  68 module vertical_bearing_holes(){
  69   translate(v=[0,0,-1]) cylinder(h = 62, r=bearing_diameter/2, $fn = 60);
  70   #rotate(a=[0,0,-70]) translate(v=[8,0,30/*was 31.5 mjr*/]) cube(size = [5,2 /*was 1 mjr*/ ,62], center = true);
  71 }
  72
  73 difference(){
  74 vertical_bearing_base();
  75 vertical_bearing_holes();
  76 }