box_frame/y-axis-bracket.scad

   1 // PRUSA iteration3
   2 // Y frame brackets
   3 // GNU GPL v3
   4 // Josef Průša <josefprusa@me.com>
   5 // Václav 'ax' Hůla <axtheb@gmail.com>
   6 // http://www.reprap.org/wiki/Prusa_Mendel
   7 // http://github.com/josefprusa/Prusa3
   8
   9 // ThingDoc entry
  10 /**
  11  * @id yFrameBracket
  12  * @name Y Axis Frame Bracket
  13  * @category Printed
  14  */
  15
  16 include <configuration.scad>
  17
  18 module bolt_track(width, length, height) {
  19     hwidth = width / 2;
  20     hdiff = hwidth - height;
  21     union() {
  22         difference() {
  23             rotate([90, 0, 0])
  24                 translate([hwidth, height, -length])
  25                 cylinder(h=length, r=hwidth, $fn=$fn);
  26
  27             if (height < hwidth) {
  28                 translate([0, -1, height - hwidth - 1])
  29                     cube([width, length + 2, hdiff + 1]);
  30             }
  31         }
  32         cube([width, length, height]);
  33     }
  34 }
  35
  36 function bracket_width(screw_area) = screw_area * 2 + y_threaded_rod_long_r * 2;
  37 function bracket_depth(lip_thickness, screw_area) = screw_area * 2 + lip_thickness;
  38 function bracket_height(lip_length=0) = y_threaded_rod_long_r * 2 + 6 * layer_height  + lip_length;
  39
  40 module yrodbracket(screw_area, lip_thickness, lip_length, bevel_size=2.0) {
  41     inner_radius = threaded_rod_diameter / 2;
  42     screw_center = screw_area / 2;
  43
  44     width = bracket_width(screw_area);
  45     depth = bracket_depth(lip_thickness, screw_area);
  46     height = bracket_height(lip_length);
  47
  48     difference() {
  49         translate([0, 0, -lip_length])
  50             cube_fillet([width, depth, height], bevel_size, top=[2, 2, 2, 2]);
  51         translate([screw_area, -1, -lip_length - lip_thickness])
  52             bolt_track(y_threaded_rod_long_r * 2, depth + 2, lip_length + lip_thickness + inner_radius);
  53
  54         translate([-1, lip_thickness, -lip_length - 1])
  55             cube([width + 2, depth, lip_length + 1]);
  56
  57         // screw holes
  58         for (x = [screw_center, width - screw_center]) {
  59             for (y = [lip_thickness + screw_center, screw_area + lip_thickness + screw_center]) {
  60                 translate([x, y, bracket_height() + 0.1])
  61                     rotate([180, 0, 0])
  62                     screw(head_drop=3, r_head=4.5);
  63             }
  64         }
  65     }
  66 }
  67
  68 rotate([90, 0, 0]) {
  69     for (x = [0, bracket_width(12) + 5]) {
  70         for (y = [0, bracket_height(3) + 5]) {
  71             translate([x, 0, y])
  72                 yrodbracket(12, 3, 3);
  73         }
  74     }
  75 }