inc/mendel_misc.inc

   1 /*
   2  *  Miscellaneous constants and standard objects used in Mendel
   3  *  by Vik Olliver 29-03-2010. Uses components of the
   4  *  OpenSCAD Shapes Library (www.openscad.at)
   5  *  Copyright (C) 2009  Catarina Mota <clifford@clifford.at>
   6  *
   7  * 5-Apr-2010 vik@diamondage.co.nz
   8  * Different clearances are being implemented for vertical and
   9  * horizontal holes, as rudimentary extruders cannot relaibly
  10  * control extrusions around corners.
  11  *
  12  * 5-Apr-2010 vik@diamondage.co.nz
  13  * Added vertex separation and adapted for Y motor bracket.
  14  *
  15  *  This program is free software; you can redistribute it and/or modify
  16  *  it under the terms of the GNU General Public License as published by
  17  *  the Free Software Foundation; either version 2 of the License, or
  18  *  (at your option) any later version.
  19  *
  20  *  This program is distributed in the hope that it will be useful,
  21  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  *  GNU General Public License for more details.
  24  *
  25  *  You should have received a copy of the GNU General Public License
  26  *  along with this program; if not, write to the Free Software
  27  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  28  *
  29 */
  30
  31
  32 // Useful constants etc.
  33 nema17_side=45;
  34 m3_clearance_rad=1.9;
  35 m4_clearance_rad_v=2.8; // Vertical clearance
  36 m4_clearance_rad_h=2.2; // Horizontal clearance
  37 m6_clearance_rad=3.7;
  38 m8_tight_rad=4.6;
  39 m8_clearance_rad=4.9;
  40 bearing_608_rad_v=11.8;
  41
  42
  43
  44 // Stuff relevant to the construction of various interconnecting bits of Mendel.
  45 //
  46 // Vertex and Y motor mount stuff.
  47 vertex_m8_sep=58;
  48 // X carriage design
  49 x_car_top_axle_offset=32;
  50 x_car_bottom_axle_offset=22.5;
  51 x_car_length= 98;       // Length of the X carriage
  52 x_car_wing_offset=7.8;  // Offset of X Carriage wings from centre line
  53 x_car_top_knob_width=13;        // Width of knobbly bit at each end of the X carriage top section.
  54 x_belt_spacing=20;
  55
  56 // Extruder size etc.
  57 extruder_mount_hole_spacing=50;
  58 extruder_thick=20;
  59 extruder_height=44;
  60
  61 // Axis leadscrew holder
  62 leadscrew_base_height=17;
  63 z_guide_bar_rad=4.3;    // Radius of the Z guide bars
  64 z_motor_rail_sep=63;
  65 z_motor_rail_height=12;
  66
  67 module box(w,h,d) {
  68         scale ([w,h,d]) cube(1, true);
  69 }
  70
  71 module hexagon(height, depth) {
  72         boxWidth=height/1.75;
  73                 union(){
  74                         box(boxWidth, height, depth);
  75                         rotate([0,0,60]) box(boxWidth, height, depth);
  76                         rotate([0,0,-60]) box(boxWidth, height, depth);
  77                 }
  78 }
  79
  80 module m8_hole_horiz(l) {
  81         cylinder(l,m8_clearance_rad,m8_clearance_rad,center=true);
  82         translate ([m8_clearance_rad*0.6,0,0]) rotate ([0,0,45])
  83                 cube([m8_clearance_rad,m8_clearance_rad,l],center=true);
  84 }
  85
  86 module m8_hole_vert(l) {
  87         cylinder(l,m8_clearance_rad,m8_clearance_rad,center=true);
  88 }
  89
  90 // For nut cavities, "height" is the max distance between two points on the hex.
  91 module m4_nut_cavity(l) {
  92         hexagon(height=7.5,depth=l);
  93 }
  94
  95 module m8_nut_cavity(l) {
  96         hexagon(height=14,depth=l);
  97 }
  98
  99 module m3_slot(l) {
 100         cube([7.149,l,3.4],center=true);
 101 }
 102
 103 module m4_hole_horiz(l) {
 104         cylinder(l,m4_clearance_rad_h,m4_clearance_rad_h,center=true);
 105         translate ([m4_clearance_rad_h*0.6,0,0]) rotate ([0,0,45])
 106                 cube([m4_clearance_rad_h,m4_clearance_rad_h,l],center=true);
 107 }
 108
 109 module m4_hole_vert(l) {
 110         cylinder(l,m4_clearance_rad_v,m4_clearance_rad_v,center=true);
 111 }
 112
 113 module m4_hole_vert_with_hex(l) {
 114         union () {
 115                 m4_hole_vert(l);
 116                 translate ([0,0,-l/4]) rotate ([0,0,30]) scale ([1.1,1.1,1]) m4_nut_cavity(l/2);
 117         }
 118 }
 119
 120 module m4_hole_horiz_with_hex(l) {
 121         union () {
 122                 m4_hole_horiz(l);
 123                 translate ([0,0,-l/4]) rotate ([0,0,0]) m4_nut_cavity(l/2);
 124         }
 125 }
 126
 127 module m8_hole_vert_with_hex(l) {
 128         union () {
 129                 m8_hole_vert(l);
 130                 translate ([0,0,-l/4]) rotate ([0,0,30]) m8_nut_cavity(l/2);
 131         }
 132 }
 133
 134
 135 // Hole for a NEMA17 with one sloped side so that the wires can dangle
 136 // out of it...
 137 module nema_17() {
 138         union () {
 139                 translate ([0,0,nema17_side/2]) box(nema17_side,nema17_side,nema17_side);
 140                 cylinder (h=nema17_side*1.5,r=24/2,center=true);
 141                 // Flip-out bit needed when building with X vertical
 142                 translate ([nema17_side/2,0,0])  rotate ([0,-45,0]) translate ([nema17_side/2,0,nema17_side/2])
 143                         box(nema17_side,nema17_side,nema17_side);
 144                 // 8mm * M3 clearance slots, 4 of.
 145                 rotate ([0,0,45]) translate([20,0,0]) box(8,m3_clearance_rad*2, 60);
 146                 rotate ([0,0,-45]) translate([20,0,0]) box(8,m3_clearance_rad*2, 60);
 147                 rotate ([0,0,135]) translate([20,0,0]) box(8,m3_clearance_rad*2, 60);
 148                 rotate ([0,0,-135]) translate([20,0,0]) box(8,m3_clearance_rad*2, 60);
 149         }
 150 }
 151
 152 // Set of 3 holes at each end of an X carriage by which the two halves are joined and balanced.
 153 module x_carriage_common_holes() {
 154         union() {
 155                 translate ([(x_car_length-x_car_top_knob_width)/2,0,0]) m4_hole_vert(60);
 156                 translate ([(x_car_length-x_car_top_knob_width)/2,16.5,0]) m4_hole_vert(60);
 157                 translate ([(x_car_length-x_car_top_knob_width)/2,-15,0])  m4_hole_vert(60);
 158                 translate ([(x_car_length-x_car_top_knob_width)/-2,0,0]) m4_hole_vert(60);
 159                 translate ([(x_car_length-x_car_top_knob_width)/-2,16.5,0]) m4_hole_vert(60);
 160                 translate ([(x_car_length-x_car_top_knob_width)/-2,-15,0])  m4_hole_vert(60);
 161         }
 162 }
 163