challenge-bot.com Git - ozzloy@gmail.com/3d-printables/blob - 3030-dampener-feet.scad

   1 /*
   2   GNU AGPLv3 (or later at your option)
   3    see bottom for more license info.
   4    please keep this notice.
   5 */
   6
   7 /*
   8   measurements from misumi's 3030 aluminum extrusion data sheet
   9    https://us.misumi-ec.com/pdf/fa/2012/p2_0545.pdf
  10 */
  11
  12 //$fn = 30; // use this while editing
  13 $fn = 100; // use this for generating STL
  14
  15 foot_height = 18;
  16 foot_length = 20;
  17 wall_width = 2;
  18 nub_depth = 4;
  19 desired_corner_rounding_radius = 2/2.1;
  20
  21 // rounding radius needs to be just under half the size of the wall_width
  22 maximum_corner_rounding_radius = wall_width / 2 - 0.1;
  23 corner_rounding_radius =
  24   (desired_corner_rounding_radius < maximum_corner_rounding_radius)
  25   ?
  26   desired_corner_rounding_radius
  27   :
  28   maximum_corner_rounding_radius;
  29
  30 fudge = 0.1;
  31 //fudge = 0.0;
  32
  33 // 3030 dimensions
  34 x = 30; // adding a little because printers aren't perfect
  35 y = 30; // adding a little because printers aren't perfect
  36 opening_width = 8;
  37
  38 outer_block = (30 - 16.5) / 2;
  39 wall = 2;
  40
  41 module ring(outer_radius, wall_width) {
  42   difference() {
  43     circle(outer_radius);
  44     circle(outer_radius - wall_width); } }
  45
  46 module fillet(r) {
  47    offset(-r) {
  48      offset(r) {
  49        children(); } } }
  50
  51 module round_corners(r) {
  52   fillet(r) { fillet(-r) { children(); } } }
  53
  54 module half_foot_2d() {
  55   // outer ring
  56   difference() {
  57     ring(foot_height + wall_width, wall_width);
  58     square(foot_height + wall_width);
  59     rotate(-45) {
  60       square(foot_height + wall_width); } }
  61   // upper connector, vertical 3030 holder
  62   translate([-wall_width, -wall_width]) {
  63     square([wall_width, foot_height + wall_width]); }
  64   // upper connecter, horizontal 3030 holder
  65   translate([-wall_width, -wall_width]) {
  66     square([wall_width + x / 2, wall_width]); }
  67   // bottom connector
  68   translate([cos(45) * foot_height,
  69              -(sin(45) * foot_height + wall_width)]) {
  70     square([x / 2 - cos(45) * foot_height, wall_width]); }
  71   // bottom nub, goes into bottom 3030 opening
  72   translate([(x - opening_width) / 2, 0]) {
  73     square([opening_width / 2, nub_depth]); }
  74   // side nub, goes into side 3030 openings
  75   a = opening_width;
  76   b = foot_height + wall_width - (y - opening_width) / 2;
  77   side_nub_length = (a < b) ? a : b;
  78   translate([0, (y - opening_width) / 2 + fudge]) {
  79     square([nub_depth, side_nub_length - fudge]); } }
  80
  81 module foot_2d() {
  82   round_corners(corner_rounding_radius) {
  83     translate([-x / 2, 0, 0]) {
  84       half_foot_2d(); }
  85     translate([x / 2, 0, 0]) {
  86       mirror() {
  87         half_foot_2d(); } } } }
  88
  89 module foot() {
  90   rotate(a = 0, v = [1, 0, 0]) {
  91     linear_extrude(height = foot_length) {
  92       foot_2d(); } } }
  93
  94 // half_foot_2d();
  95 // foot_2d();
  96 foot();
  97
  98 /*
  99   This file is part of 3d-printables.
 100
 101   3d-printables is free software: you can redistribute it and/or modify
 102   it under the terms of the GNU Affero General Public License as published by
 103   the Free Software Foundation, either version 3 of the License, or
 104   (at your option) any later version.
 105
 106   3d-printables is distributed in the hope that it will be useful,
 107   but WITHOUT ANY WARRANTY; without even the implied warranty of
 108   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 109   GNU Affero General Public License for more details.
 110
 111   You should have received a copy of the GNU Affero General Public License
 112   along with challenge-bot.  If not, see <http://www.gnu.org/licenses/>.
 113 */