box_frame/z-axis.scad

   1 // PRUSA iteration3
   2 // Z axis
   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/prusajr/PrusaMendel
   8
   9 include <configuration.scad>
  10
  11 module zmotorholder(thickness=23, bottom_thickness=5){
  12     difference(){
  13         union(){
  14             // Motor holding part
  15             difference(){
  16                 union(){
  17                     zrodholder(thickness=thickness, xlen=45, ylen=45, zdelta=((i_want_to_use_single_plate_dxf_and_make_my_z_weaker == 0) ? 0 : 5));
  18                     translate([board_to_xz_distance, board_to_xz_distance, 0]) {
  19                         nema17(places=[0, 1, 1, 1], h=bottom_thickness + layer_height, $fn=23, shadow=layer_height + 2);
  20                     }
  21                 }
  22
  23                 // motor screw holes
  24                 translate([board_to_xz_distance, board_to_xz_distance, thickness]) {
  25                     mirror([0, 0, 1]) translate([0, 0, thickness-8])
  26                         nema17(places=[0, 1, 1, 1], holes=true, h=bottom_thickness + 1);
  27                         //shadow=-6 + layer_height);
  28                 }
  29             }
  30         }
  31     }
  32 }
  33
  34
  35 module zrodholder(thickness=15, bottom_thickness=5, ylen=42, xlen=34, zdelta=0){
  36     holder_inner_r = 9;
  37     difference(){
  38         union(){
  39             difference(){
  40                 union(){
  41                     //piece along the flat side of a board
  42                     cube_fillet([14, ylen, bottom_thickness], vertical=[8, 3, 0, 0]);
  43                     cube_fillet([5, ylen, thickness], vertical=[3, 3, 0, 0], top = [thickness/2, 0, 0, 5]);
  44                     //hole for Z axis is thru this
  45                     cube_fillet([xlen, 14, bottom_thickness], vertical=[3, 0, 0, 3]);
  46                     translate([14,14,0]) {
  47                         //large fillet that makes it stiffer by lot. Thanks to Marcus Wolschon
  48                         difference(){
  49                             cube([holder_inner_r,holder_inner_r,bottom_thickness]);
  50                             translate([holder_inner_r, holder_inner_r, -0.5])
  51                                 cylinder(r=holder_inner_r, h=bottom_thickness + 1);
  52                         }
  53                     }
  54                     //piece along cut side of the board
  55                     if (i_am_box == 1) {
  56                         translate([-board_thickness, 0, 0])
  57                             cube_fillet([board_thickness + board_to_xz_distance + bushing_z[0], 5, thickness], radius=2, top = [0, 0, 0, thickness]);
  58                     } else {
  59                         translate([-board_thickness/2, 0, 0])
  60                             cube_fillet([board_thickness/2 + board_to_xz_distance + bushing_z[0], 5, thickness], radius=2, top = [0, 0, 0, thickness]);
  61                     }
  62                     //smooth rod insert
  63                     translate([board_to_xz_distance - z_delta, 9, 0])
  64                         cylinder(h=bottom_thickness / 2, r=(bushing_z[0] + 5 * single_wall_width));
  65                 }
  66                 //smooth rod hole
  67                 translate([board_to_xz_distance - z_delta, 9, -1]) cylinder_poly(h=board_thickness+20, r=bushing_z[0] + single_wall_width / 4);
  68                 //inside rouned corner
  69                 translate([0, 5, -1]) cylinder(r=1.2, h=100, $fn=8);
  70                 //side screw
  71                 //translate([-board_thickness/2, 0, thickness/2-1.5]) rotate([-90, 0, 0]) screw(h=30, r_head=4);
  72                 //front screws
  73                 if (i_am_box != 1) {
  74                     //single plate has both screws on front
  75                     translate([16, 35, bottom_thickness + 4.5 + zdelta]) rotate([0, -90, 0]) {
  76                         screw(head_drop=14, h=122, r_head=4.5);
  77                     }
  78                     translate([16, 15, bottom_thickness + 4.5 + zdelta]) rotate([0, -90, 0]) {
  79                         screw(head_drop=14, h=122, r_head=4.5);
  80                     }
  81                 } else {
  82                     translate([16, 30, bottom_thickness+4]) rotate([0, -90, 0]) {
  83                         screw(head_drop=12, h=122, r_head=4);
  84                     }
  85                     //side screw
  86                     translate([-board_thickness/2, 0, thickness/2]) rotate([-90, 0, 0]) screw(h=30, r_head=4.5, head_drop=1);
  87                 }
  88             }
  89         }
  90     }
  91 }
  92 translate([0, -2, 0]) mirror([0, 1, 0]) zmotorholder();
  93 translate([0, 2, 0]) zmotorholder();
  94 translate([23, -64, 0]) zrodholder();
  95 translate([23, 64, 0]) mirror([0, 1, 0]) zrodholder();