scad/x-end.scad

   1 // PRUSA iteration3
   2 // X end prototype
   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
   8 use <bearing.scad>
   9
  10 rod_distance = 45;
  11 pushfit_d = 8.15;
  12 hex_nut_r = 4.75;
  13
  14 module nut_trap_base () {
  15      cube(size=[7.8,20,8],center=true);
  16      translate ([2,0,0]) cylinder(h=8,r=12.5,$fn=50,center=true);
  17 }
  18
  19 module nut_trap () {
  20      union() {
  21                // center post of brass nut
  22                    cylinder(h=12,r=5.45,$fn=50,center=true);
  23                    // holes for m3 screws in brass nut
  24                    #translate(v=[8,0,0]) cylinder(h=12,r=1.8,$fn=20,center=true);
  25                    // screw hole would interfere with the linear bearings
  26 //                   #rotate([0,0,90]) translate(v=[8,0,0]) cylinder(h=12,r=1.8,$fn=20,center=true);
  27                    rotate([0,0,180]) {
  28                         translate(v=[8,0,0]) cylinder(h=12,r=1.8,$fn=20,center=true);
  29                         // add a trap for an m3 nylock nut since this part
  30                         // goes inside of the x-end body
  31                         translate(v=[8,0,7.25]) rotate ([0,0,180/12])
  32                              // $fn = 12 makes it easier to insert the nut
  33                              cylinder(h=4.5, r=5.5 / 2 / cos(180 / 6) + 0.1, center=true, $fn=12);
  34                    }
  35                    #rotate([0,0,270]) translate(v=[8,0,0]) cylinder(h=12,r=1.8,$fn=20,center=true);
  36      }
  37 }
  38
  39 module x_end_base(){
  40 // Main block
  41 height = 58;
  42 translate(v=[-15,-9,height/2]) cube(size = [17,39,height], center = true);
  43 // Bearing holder
  44  vertical_bearing_base();
  45 //Nut trap
  46  translate(v=[-2-2,-17,4]) nut_trap_base ();
  47  // Cube
  48 // #translate(v=[-2-2,-17,4]) cube(size = [8,16,8], center = true);
  49  // Hexagon
  50 // #translate(v=[0,-17,0]) rotate([0,0,30]) cylinder(h = 8, r=8, $fn = 6);
  51 }
  52
  53 module x_end_holes(){
  54  vertical_bearing_holes();
  55  // Belt hole
  56  translate(v=[-1,0,0]){
  57  // Stress relief
  58  translate(v=[-5.5-10+1.5,-10-1,30]) cube(size = [20,1,28], center = true);
  59  difference(){
  60         translate(v=[-5.5-10+1.5,-10,30]) cube(size = [10,46,28], center = true);
  61
  62         // Nice edges
  63         translate(v=[-5.5-10+1.5,-10,30+23]) rotate([0,45,0]) cube(size = [10,46,28], center = true);
  64         translate(v=[-5.5-10+1.5,-10,30+23]) rotate([0,-45,0]) cube(size = [10,46,28], center = true);
  65         translate(v=[-5.5-10+1.5,-10,30-23]) rotate([0,45,0]) cube(size = [10,46,28], center = true);
  66         translate(v=[-5.5-10+1.5,-10,30-23]) rotate([0,-45,0]) cube(size = [10,46,28], center = true);
  67
  68 }
  69 }
  70
  71
  72
  73 // Bottom pushfit rod
  74 translate(v=[-15,-41.5,6]) rotate(a=[-90,0,0]) pushfit_rod(pushfit_d,50);
  75 // Top pushfit rod
  76 translate(v=[-15,-41.5,rod_distance+6]) rotate(a=[-90,0,0]) pushfit_rod(pushfit_d,50);
  77 // Nut trap
  78 translate(v=[0,-17,3]) nut_trap ();
  79 // #translate(v=[0,-17,-0.5]) cylinder(h = 4, r1=3.4, r2=2.9, $fn=25);
  80 // translate(v=[0,-17,3]) rotate([0,0,30]) cylinder(h = 10, r=hex_nut_r, $fn = 6);
  81 }
  82
  83
  84 // Final prototype
  85 module x_end_plain(){
  86  difference(){
  87   x_end_base();
  88   x_end_holes();
  89  }
  90 }
  91
  92 x_end_plain();
  93
  94
  95 module pushfit_rod(diameter,length){
  96  translate([0,-0.3,0])  cylinder(h = length, r=diameter/2, $fn=30);
  97  translate([0,0.3,0])  cylinder(h = length, r=diameter/2, $fn=30);
  98 // difference(){
  99 //      translate(v=[0,-diameter/2.85,length/2]) rotate([0,0,45]) cube(size = [diameter/2,diameter/2,length], center = true);
 100 //      translate(v=[0,-diameter/4-diameter/2-0.4,length/2]) rotate([0,0,0]) cube(size = [diameter,diameter/2,length], center = true);
 101 // }
 102
 103 }
 104