challenge-bot.com Git - ozzloy@gmail.com/3d-printables/blob - spin-data.scad

   1 /* GNU AGPLv3 (or later at your option)
   2    see bottom for more license info */
   3
   4 /* spin thing that erin likes */
   5 $fn = 50;
   6
   7 layer_height = 0.15;
   8
   9 weight = "penny";
  10 // weight = "608zz";
  11 bearing = "608zz";
  12 weight_lip_overhang = 0.3;
  13 bearing_lip_overhang = weight_lip_overhang;
  14 // TODO: switch wall_thickness -> wall
  15 wall_thickness = 3;
  16 wall = 3;
  17 penny_thickness = 1.52;
  18 penny_radius = 19.05 / 2;
  19
  20 _608zz_radius = 22 / 2;
  21 _608zz_inner_radius = 8.1 / 2;
  22 _608zz_cover_radius = 19.4 / 2;
  23 _608zz_cap_footprint_radius = 12 / 2;
  24 _608zz_thickness = 7;
  25
  26 weight_radius = (weight == "penny") ? penny_radius : _608zz_radius;
  27 weight_thickness = (weight == "penny") ?
  28      penny_thickness * 5 : _608zz_thickness;
  29
  30 bearing_radius = (bearing == "608zz") ? _608zz_radius : 1/0;
  31 bearing_inner_radius = (bearing == "608zz") ? _608zz_inner_radius : 1/0;
  32 bearing_cover_radius = (bearing == "608zz")
  33                        ? _608zz_cover_radius + wall
  34                        : 1/0;
  35 bearing_cap_footprint_radius =
  36      (bearing == "608zz") ? _608zz_cap_footprint_radius : 1/0;
  37 bearing_thickness = (bearing == "608zz") ? _608zz_thickness : 1/0;
  38
  39 spinner_height = penny_thickness * 5 + 2;
  40 arms = 3;
  41
  42 module cap(bearing_inner_radius,
  43            bearing_cap_footprint_radius,
  44            bearing_cover_radius,
  45            bearing_thickness) {
  46   footprint_height = 1.6;
  47   footprint_radius_safety = 0.25;
  48   cap_height = 3;
  49   bearing_cover_radius_safety = 0.75;
  50   bearing_thickness_safety = 0.2;
  51
  52   difference() {
  53     union() {
  54       cylinder(r1 = bearing_cover_radius - tan(30) * cap_height,
  55                r2 = bearing_cover_radius,
  56                h = cap_height);
  57       linear_extrude(height = cap_height + footprint_height) {
  58         circle(bearing_cap_footprint_radius - footprint_radius_safety); }
  59       linear_extrude(height = cap_height
  60                               + footprint_height
  61                               + bearing_thickness / 2
  62                               - bearing_thickness_safety) {
  63         circle(bearing_inner_radius); } }
  64     translate([0, 0, -0.01]) {
  65       cylinder(r1 = bearing_inner_radius + tan(30) * (cap_height - 1),
  66                r2 = bearing_inner_radius,
  67                h = cap_height - 1); } } }
  68
  69 module ring(outer_radius, inner_radius) {
  70   difference() {
  71     circle(outer_radius);
  72     circle(inner_radius); } }
  73
  74 module fillet(r) {
  75   offset(r = -r) { offset(delta = r) { children(); } } }
  76
  77 module spin_footprint(weight_radius,
  78                       bearing_radius,
  79                       round_extra,
  80                       wall,
  81                       arms) {
  82   thinner_radius = (bearing_radius < weight_radius)?
  83     bearing_radius : weight_radius;
  84   fillet(thinner_radius) {
  85     for(arm = [0 : arms - 1]) {
  86       hull() {
  87         circle(bearing_radius + round_extra);
  88         rotate( (arm / arms) * 360 ) {
  89           translate([bearing_radius + wall + weight_radius, 0]) {
  90             circle(weight_radius + round_extra); } } } } } }
  91
  92 module mirrored(axis) {
  93   children();
  94   mirror(axis) children(); }
  95
  96 module spin(weight_radius,
  97             weight_thickness,
  98             bearing_radius,
  99             bearing_thickness,
 100             weight_lip_overhang = 0.3,
 101             bearing_lip_overhang = 0.3,
 102             wall = 3,
 103             arms = 3) {
 104   layer_height = 0.15;
 105   thicker_thickness = (bearing_thickness > weight_thickness) ?
 106     bearing_thickness : weight_thickness;
 107   calculated_height = thicker_thickness + 2 * wall;
 108   layers = 2 * ceil(ceil(calculated_height / layer_height) / 2);
 109   actual_height = layers * layer_height;
 110   round_radius = actual_height / 2;
 111
 112   mirrored([0, 0, 1]) {
 113     for(layer = [0 : (layers / 2) - 1]) {
 114       translate([0, 0, layer * layer_height - actual_height / 2]) {
 115         linear_extrude(height = layer_height) {
 116           adjacent = round_radius - (layer * layer_height);
 117           angle = acos(adjacent / round_radius);
 118           round_extra = adjacent * tan(angle);
 119           spin_footprint(weight_radius,
 120                          bearing_radius,
 121                          round_extra,
 122                          wall,
 123                          arms); } } } } }
 124
 125 /*
 126   This file is part of 3d-printables.
 127
 128   3d-printables is free software: you can redistribute it and/or modify
 129   it under the terms of the GNU Affero General Public License as published by
 130   the Free Software Foundation, either version 3 of the License, or
 131   (at your option) any later version.
 132
 133   3d-printables is distributed in the hope that it will be useful,
 134   but WITHOUT ANY WARRANTY; without even the implied warranty of
 135   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 136   GNU Affero General Public License for more details.
 137
 138   You should have received a copy of the GNU Affero General Public License
 139   along with challenge-bot.  If not, see <http://www.gnu.org/licenses/>.
 140 */