box_frame/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 // Also includes code from Wilson and Wilson2, (c) Marty Rice
   9 // https://github.com/mjrice/wilson
  10
  11 // todo: make x-end height global and make anything relying implicitly
  12 // on the height of the x-end use that for positioning.
  13
  14 // bearing height, strain relief (&& maybe make dependent upon the bearing diameter)
  15
  16 // major issues with rev 3
  17
  18 // - motor side screw hole conflicts with switch / other rear mount is
  19 //   inaccessible without removing the leadscrew from the nut
  20
  21 // - New idler anti-pitching ribs are too big (new idler I wasn't
  22 //   using is larger so the existing ones worked fine for that one...)
  23 //   NOTE: new idler is meant for integrated toothed idler...
  24
  25 use <bushing.scad>
  26 include <configuration.scad>
  27
  28 pushfit_d = bushing_xy[0] * 2 + 0.25; //smooth_rod_d + 0.25;
  29 rod_distance = 50;
  30 x_box_height = 5 + rod_distance + bushing_xy[0] * 2 + 0.25;
  31 hex_nut_r = 4.75;
  32 thinwall = 3;
  33
  34 module vertical_bushing_base(bushing){
  35      bushing_size = bushing[1]*2 + 2 * thinwall;
  36      translate(v=[-2-bushing_size/4,0,x_box_height/2]) cube(size = [4+bushing_size/2,bushing_size,x_box_height], center = true);
  37      cylinder(h = x_box_height, r=bushing_size/2, $fn = 90);
  38 }
  39
  40 module vertical_bushing_holes(bushing){
  41      bushing_cut_extra = 0.2; // padding so it's not too tight
  42   translate(v=[0,0,-4]) cylinder(h = x_box_height + 3, r=bushing[1] + bushing_cut_extra, $fn = 60);
  43   translate(v=[0,0,x_box_height-4]) cylinder(h=x_box_height,r=bushing[1]-1,$fn=60);
  44   // TODO: make translate(z) use x_box_height to correctly position slit
  45   #rotate(a=[0,0,-50]) translate(v=[8,0,24/*was 31.5 mjr*/]) cube(size = [10,2 /*was 1 mjr*/ ,x_box_height+13], center = true);
  46   translate([0,0,-1]) cylinder(h=9,r1=bushing[1]+thinwall/2+1,r2=4,$fn=60);
  47   //#translate([0,0,49]) cylinder(h=9,r2=bushing[1]+thinwall/2,r1=4,$fn=60);
  48 }
  49
  50
  51 module nut_trap_base () {
  52      cube(size=[16,21,8],center=true);
  53      translate ([2,0,0]) cylinder(h=8,r=12.5,$fn=50,center=true);
  54 }
  55
  56 module nut_trap () {
  57      union() {
  58                // center post of brass nut
  59                    cylinder(h=12,r=5.45,$fn=50,center=true);
  60                    // holes for m3 screws in brass nut
  61                    translate(v=[8,0,0]) cylinder(h=12,r=1.8,$fn=20,center=true);
  62                    #rotate([0,0,90]) translate(v=[8,0,0]) cylinder(h=12,r=1.8,$fn=20,center=true);
  63                    rotate([0,0,180]) translate(v=[8,0,0]) cylinder(h=12,r=1.8,$fn=20,center=true);
  64                    #rotate([0,0,270]) translate(v=[8,0,0]) cylinder(h=12,r=1.8,$fn=20,center=true);
  65      }
  66 }
  67
  68 module x_end_base(){
  69 // Main block
  70 height = x_box_height;
  71 // TODO: calculate correct translate(y) + cube(y) using size of bearing
  72 translate(v=[-15,-10,height/2]) cube(size = [17,45,height], center = true);
  73 // Bearing holder
  74  vertical_bushing_base(bushing_z);
  75 //Nut trap
  76  translate(v=[-4+zmotor_delta_x,-17-zmotor_delta_y,4]) nut_trap_base ();
  77  // Cube
  78 // #translate(v=[-2-2,-17,4]) cube(size = [8,16,8], center = true);
  79  // Hexagon
  80 // #translate(v=[0,-17,0]) rotate([0,0,30]) cylinder(h = 8, r=8, $fn = 6);
  81 }
  82
  83 module x_end_holes(){
  84  vertical_bushing_holes(bushing_z);
  85  // Belt hole
  86  translate(v=[-1,0,0]){
  87  // Stress relief
  88  translate(v=[-5.5-10+1.5,-bushing_z[1]-4,30]) cube(size = [20,1,28], center = true);
  89  // Cut out for belt (this is NOT centered because the motor isn't centered)
  90  difference(){
  91         translate(v=[-5.5-10+1.5,-10,30]) cube(size = [10,46,28], center = true);
  92
  93         // Nice edges
  94         translate(v=[-5.5-10+1.5,-10,30+23]) rotate([0,45,0]) cube(size = [10,46,28], center = true);
  95         translate(v=[-5.5-10+1.5,-10,30+23]) rotate([0,-45,0]) cube(size = [10,46,28], center = true);
  96         translate(v=[-5.5-10+1.5,-10,30-23]) rotate([0,45,0]) cube(size = [10,46,28], center = true);
  97         translate(v=[-5.5-10+1.5,-10,30-23]) rotate([0,-45,0]) cube(size = [10,46,28], center = true);
  98
  99 }
 100 }
 101
 102
 103  pushrod_extra_z = 2.5;
 104 // Bottom pushfit rod
 105 #translate(v=[-15,-41.5,bushing_xy[0]+pushrod_extra_z]) rotate(a=[-90,0,0]) pushfit_rod(pushfit_d,50);
 106 // Top pushfit rod
 107 translate(v=[-15,-41.5,rod_distance+bushing_xy[0]+pushrod_extra_z]) rotate(a=[-90,0,0]) pushfit_rod(pushfit_d,50);
 108 // Nut trap
 109 translate(v=[zmotor_delta_x,-17-zmotor_delta_y,3]) rotate ([0, 0, 45]) nut_trap ();
 110 // #translate(v=[0,-17,-0.5]) cylinder(h = 4, r1=3.4, r2=2.9, $fn=25);
 111 // translate(v=[0,-17,3]) rotate([0,0,30]) cylinder(h = 10, r=hex_nut_r, $fn = 6);
 112 }
 113
 114
 115 // Final prototype
 116 module x_end_plain(){
 117  difference(){
 118   x_end_base();
 119   x_end_holes();
 120  }
 121 }
 122
 123 x_end_plain();
 124
 125
 126 module pushfit_rod(diameter,length){
 127  translate([0,-0.3,0])  cylinder(h = length, r=diameter/2, $fn=30);
 128  translate([0,0.3,0])  cylinder(h = length, r=diameter/2, $fn=30);
 129 // difference(){
 130 //      translate(v=[0,-diameter/2.85,length/2]) rotate([0,0,45]) cube(size = [diameter/2,diameter/2,length], center = true);
 131 //      translate(v=[0,-diameter/4-diameter/2-0.4,length/2]) rotate([0,0,0]) cube(size = [diameter,diameter/2,length], center = true);
 132 // }
 133
 134 }
 135