carriage adapter/itty-wilson.scad

   1 /*
   2 min y = 0
   3 max y = 100
   4 min x = 1205
   5 max x = 1254
   6
   7 Makerfair X carriage plate adapter for the Wilson RepRap.
   8 Copyright (c) 2015 Clinton Ebadi <clinton@unknownlamer.org>
   9
  10     This program is free software: you can redistribute it and/or modify
  11     it under the terms of the GNU General Public License as published by
  12     the Free Software Foundation, either version 3 of the License, or
  13     (at your option) any later version.
  14
  15     This program is distributed in the hope that it will be useful,
  16     but WITHOUT ANY WARRANTY; without even the implied warranty of
  17     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18     GNU General Public License for more details.
  19
  20     You should have received a copy of the GNU General Public License
  21     along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22
  23 Measurements reverse engineered from
  24 https://github.com/RickSisco/MakerFarm-Prusa-i3v-12-Inch
  25
  26 Intended for use with the itty bitty dual extruder series.
  27
  28 Source needs a good cleanup. Evil loops that don't take advantage of
  29 the geometry of the object abound.
  30
  31 */
  32
  33 use <MCAD/nuts_and_bolts.scad>
  34
  35 carriage_height = 65;
  36 carriage_width = 50;
  37
  38 plate_width = 75; // wilson carriage is only 50mm wide!
  39 plate_depth = 6; // wilson default depth = 8, makerfarm = 6
  40
  41 hole_tolerance = 0.25; // widen holes a bit, may still need to drill out
  42
  43 plate_cut_height = 6.5;
  44 plate_cut_width = 6;
  45 plate_cut_distance = 13;
  46 plate_cut_center = 25.1;
  47 plate_cut_y_offset = 27;
  48 plate_cut_bolt = 3 + hole_tolerance;
  49 plate_cut_x_bolt_offset = 10.5 + plate_cut_bolt / 2;
  50
  51 plate_extra_height = 3; // make plate a bit taller so it is structurally sound
  52
  53 plate_height = plate_cut_height + plate_cut_y_offset + plate_extra_height;
  54
  55 lower_cut_y_offset = 5.33; // 5.325 in CAD
  56 lower_bolt_x_offset = 1.5 + plate_cut_bolt / 2;
  57 lower_bolt_y_offset = 3.275 + plate_cut_bolt / 2;
  58
  59 carriage_bolt = 4 + hole_tolerance;
  60 carriage_hole_spacing = 24;
  61 carriage_clearance = 20; // holes are 20mm from bottom of plate
  62 carriage_y_offset =  plate_cut_y_offset + plate_cut_height + carriage_clearance;
  63 carriage_nut_depth = 3.2 + 3.2/2 + 0.1; // m4 nut depth + half of an m4 nut + tolerance
  64
  65 corner_radius = 3; // round off the corners to make it look nicer
  66
  67 shelf_mount ();
  68 translate ([(plate_width - carriage_width) / 2, plate_height - plate_extra_height, 0]) carriage_mount ();
  69
  70 // mount to wilson x-carriage
  71 module carriage_mount () {
  72      difference () {
  73           linear_extrude (height = plate_depth, convexity = 8) {
  74                // outline of plate + bolt holes
  75                difference () {
  76                     translate ([corner_radius, corner_radius, 0]) {
  77                          minkowski () {
  78                               square ([carriage_width - corner_radius*2, carriage_height - corner_radius]);
  79                               circle (r = corner_radius);
  80                          }
  81                     }
  82
  83                     #translate ([(carriage_width - carriage_hole_spacing) / 2, (carriage_height - carriage_hole_spacing) /2, 0])
  84                     for (x = [0, carriage_hole_spacing], y = [0, carriage_hole_spacing]) {
  85                          translate ([x, y, 0]) circle (d = carriage_bolt, $fn = 16);
  86                     }
  87                }
  88           }
  89           // after extruding, cut out spaces for M4 hex nuts.
  90           translate ([(carriage_width - carriage_hole_spacing) / 2, (carriage_height - carriage_hole_spacing) /2, plate_depth - carriage_nut_depth]) {
  91                for (x = [0, carriage_hole_spacing], y = [0, carriage_hole_spacing]) {
  92                     translate ([x, y, 0]) linear_extrude (height = carriage_nut_depth + 0.01) nutHole (size = carriage_bolt, proj = 1);
  93                }
  94           }
  95      }
  96 }
  97
  98 // mount for makerfarm extruder shelf
  99 module shelf_mount () {
 100      linear_extrude (height = plate_depth, convexity = 8) {
 101           difference () {
 102                translate ([corner_radius, corner_radius, 0]) {
 103                     minkowski () {
 104                          square ([plate_width - corner_radius*2, plate_height - corner_radius*2]);
 105                          circle (r = corner_radius);
 106                     }
 107                }
 108
 109                // upper shelf mount
 110                translate ([0, plate_cut_y_offset, 0]) {
 111                     for (x = [-0.01, plate_cut_width + plate_cut_distance, plate_cut_width*2 + plate_cut_distance + plate_cut_center, plate_cut_width*3 + plate_cut_distance*2 + plate_cut_center + 0.01])
 112                          translate ([x, 0, 0]) square ([plate_cut_width, plate_cut_height]);
 113
 114                     // looks like the bolt is at the midpoint between the cut outs
 115                     for (x = [plate_cut_x_bolt_offset, plate_width - plate_cut_x_bolt_offset])
 116                          translate ([x, plate_cut_height / 2, 0]) circle (d = plate_cut_bolt + hole_tolerance, $fn = 16);
 117                }
 118
 119                // lower shelf mount
 120                translate ([0, lower_cut_y_offset, 0]) {
 121                     for (x = [-0.01, plate_width - plate_cut_width + 0.01]) {
 122                          // lower cut out is closer to 6mm than 6.5mm in cad drawings
 123                          translate ([x, -0.01, 0]) square ([plate_cut_width, plate_cut_height - 0.5]);
 124                     }
 125                     // I think the intention is for the screw holes to be centered over the cut out
 126                     for (x = [lower_bolt_x_offset, plate_width - lower_bolt_x_offset])
 127                          translate ([x, plate_cut_height + lower_bolt_y_offset, 0]) circle (d = plate_cut_bolt + hole_tolerance, $fn = 16);
 128                }
 129           }
 130      }
 131 }