| 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 = 0.35; |
| 8 | |
| 9 | weight = "penny"; |
| 10 | // weight = "608zz"; |
| 11 | bearing = "608zz"; |
| 12 | weight_lip_overhang = 0.3; |
| 13 | bearing_lip_overhang = weight_lip_overhang; |
| 14 | wall = 3; |
| 15 | penny_thickness = 1.52; |
| 16 | penny_radius = 19.05 / 2; |
| 17 | |
| 18 | _608zz_radius = 22 / 2; |
| 19 | _608zz_inner_radius = 8.1 / 2; |
| 20 | _608zz_cover_radius = _608zz_radius; |
| 21 | _608zz_cap_footprint_radius = 12 / 2; |
| 22 | _608zz_thickness = 7; |
| 23 | |
| 24 | weight_radius = (weight == "penny") ? penny_radius : _608zz_radius; |
| 25 | weight_thickness = (weight == "penny") ? |
| 26 | penny_thickness * 5 : _608zz_thickness; |
| 27 | |
| 28 | bearing_radius = (bearing == "608zz") ? _608zz_radius : 1/0; |
| 29 | bearing_window_radius = bearing_radius - bearing_lip_overhang - 1; |
| 30 | bearing_inner_radius = (bearing == "608zz") ? _608zz_inner_radius : 1/0; |
| 31 | bearing_cover_radius = (bearing == "608zz") |
| 32 | ? _608zz_cover_radius |
| 33 | : 1/0; |
| 34 | bearing_cap_footprint_radius = |
| 35 | (bearing == "608zz") ? _608zz_cap_footprint_radius : 1/0; |
| 36 | bearing_thickness = (bearing == "608zz") ? _608zz_thickness : 1/0; |
| 37 | |
| 38 | spinner_height = penny_thickness * 5 + 2; |
| 39 | arms = 3; |
| 40 | |
| 41 | module cap(bearing_inner_radius, |
| 42 | bearing_cap_footprint_radius, |
| 43 | bearing_cover_radius, |
| 44 | bearing_thickness, |
| 45 | bearing_window_radius) { |
| 46 | footprint_height = 4.5; |
| 47 | footprint_radius_safety = 0.2; |
| 48 | cap_height = 3; |
| 49 | bearing_thickness_safety = 0.6; |
| 50 | finger_spot_height = cap_height / 10; |
| 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 |
| 58 | + footprint_height |
| 59 | - 1.05) { |
| 60 | circle(bearing_window_radius - 1); } |
| 61 | linear_extrude(height = cap_height + footprint_height) { |
| 62 | circle(bearing_cap_footprint_radius - footprint_radius_safety); } |
| 63 | linear_extrude(height = cap_height |
| 64 | + footprint_height |
| 65 | + bearing_thickness / 2 |
| 66 | - bearing_thickness_safety) { |
| 67 | circle(bearing_inner_radius); } |
| 68 | } |
| 69 | translate([0, 0, -0.01]) { |
| 70 | cylinder(r1 = bearing_inner_radius, |
| 71 | r2 = bearing_inner_radius - tan(30) * finger_spot_height, |
| 72 | h = finger_spot_height); } } } |
| 73 | |
| 74 | module donut(height, footprint_radius) { |
| 75 | bread_radius = height / 2; |
| 76 | rotate_extrude() { |
| 77 | translate([footprint_radius, 0]) { |
| 78 | circle(bread_radius); } } } |
| 79 | |
| 80 | module donut_hole(height, footprint_radius) { |
| 81 | difference() { |
| 82 | cylinder(r = footprint_radius, h = height, center = true); |
| 83 | donut(height, footprint_radius); } } |
| 84 | |
| 85 | module jelly_filled(height, footprint_radius) { |
| 86 | cylinder(r = footprint_radius, h = height, center = true); |
| 87 | donut(height, footprint_radius); } |
| 88 | |
| 89 | module fillet(r) { |
| 90 | offset(r = -r) { offset(delta = r) { children(); } } } |
| 91 | |
| 92 | module mirrored(axis) { |
| 93 | children(); |
| 94 | mirror(axis) children(); } |
| 95 | |
| 96 | module spin_slice(weight_radius, |
| 97 | bearing_radius, |
| 98 | round_extra, |
| 99 | wall, |
| 100 | arms) { |
| 101 | joiner_radius = (bearing_radius + weight_radius) / 2; |
| 102 | |
| 103 | bearing_xy = [0, 0]; |
| 104 | // a = side along x axis |
| 105 | a = bearing_radius + weight_radius + wall; |
| 106 | // b = side from center to joiner |
| 107 | b = bearing_radius + joiner_radius + round_extra; |
| 108 | // c = side between joiner and arm center |
| 109 | c = joiner_radius + weight_radius + round_extra; |
| 110 | |
| 111 | weight_xy = [a, 0]; |
| 112 | |
| 113 | cos_C = (pow(a, 2) + pow(b, 2) - pow(c, 2)) / (2 * a * b); |
| 114 | sin_C = sqrt(1 - pow(cos_C, 2)); |
| 115 | |
| 116 | joiner_xy = [cos_C, sin_C] * b; |
| 117 | |
| 118 | for(arm = [0 : arms - 1]) { |
| 119 | rotate(arm * (360 / arms)) { |
| 120 | difference() { |
| 121 | union() { |
| 122 | translate(bearing_xy) { |
| 123 | circle(bearing_radius + round_extra); } |
| 124 | translate(weight_xy) { |
| 125 | circle(weight_radius + round_extra); } |
| 126 | mirrored([0, 1]) { |
| 127 | polygon([bearing_xy, weight_xy, joiner_xy]); } } |
| 128 | mirrored([0, 1]) { |
| 129 | translate(joiner_xy) { |
| 130 | circle(joiner_radius); } } } } } } |
| 131 | |
| 132 | module spin_slices(weight_radius, |
| 133 | weight_thickness, |
| 134 | bearing_radius, |
| 135 | bearing_thickness, |
| 136 | weight_lip_overhang = 0.3, |
| 137 | bearing_lip_overhang = 0.3, |
| 138 | wall = 3, |
| 139 | arms = 3, |
| 140 | layer_height = 0.15) { |
| 141 | thicker_thickness = (bearing_thickness > weight_thickness) ? |
| 142 | bearing_thickness : weight_thickness; |
| 143 | calculated_height = thicker_thickness + 2 * wall; |
| 144 | layers = 2 * ceil(ceil(calculated_height / layer_height) / 2); |
| 145 | actual_height = layers * layer_height; |
| 146 | round_radius = actual_height / 2; |
| 147 | |
| 148 | /* rounding the outside edge of the spinner with a semi-circle leads |
| 149 | to a shape that an overhang on the second layer several times the |
| 150 | thickness of a printed extrusion width. |
| 151 | |
| 152 | rather than using a full semi-circle, this code aims to use just the |
| 153 | portion in the middle, where the overhang is less severe */ |
| 154 | old_start = 0; |
| 155 | old_end = (layers / 2) - 1; |
| 156 | |
| 157 | /* add one to have some thickness all around weight holes |
| 158 | for first layer */ |
| 159 | new_start = old_end / 16 + 1; |
| 160 | new_end = old_end; |
| 161 | |
| 162 | old_range = old_end - old_start; |
| 163 | new_range = new_end - new_start; |
| 164 | |
| 165 | factor = new_range / old_range; |
| 166 | |
| 167 | /* initial adjacent is adjusted to (new start - 1) to allow some |
| 168 | thickness all around weight holes on first layer */ |
| 169 | initial_adjacent = round_radius - ((new_start - 1) * layer_height); |
| 170 | initial_angle = acos(initial_adjacent / round_radius); |
| 171 | initial_round_extra = initial_adjacent * tan(initial_angle); |
| 172 | |
| 173 | difference() { |
| 174 | mirrored([0, 0, 1]) { |
| 175 | for(layer = [0 : (layers / 2) - 1]) { |
| 176 | translate([0, 0, layer * layer_height - actual_height / 2]) { |
| 177 | linear_extrude(height = layer_height) { |
| 178 | new_layer = (layer - old_start) * factor + new_start; |
| 179 | adjacent = round_radius - (new_layer * layer_height); |
| 180 | angle = acos(adjacent / round_radius); |
| 181 | round_extra = adjacent * tan(angle) - initial_round_extra; |
| 182 | spin_slice(weight_radius, |
| 183 | bearing_radius, |
| 184 | round_extra, |
| 185 | wall, |
| 186 | arms); } } } } |
| 187 | cylinder(h = actual_height + 0.1, |
| 188 | r = bearing_radius - bearing_lip_overhang, |
| 189 | center = true); |
| 190 | cylinder(h = bearing_thickness + 0.05, |
| 191 | r = bearing_radius + 0.15, |
| 192 | center = true); |
| 193 | for(arm = [0 : arms - 1]) { |
| 194 | rotate(arm * (360 / arms)) { |
| 195 | translate([bearing_radius + wall + weight_radius, 0]) { |
| 196 | cylinder(h = actual_height + 0.1, |
| 197 | r = weight_radius - weight_lip_overhang, |
| 198 | center = true); |
| 199 | cylinder(h = weight_thickness + 0.05, |
| 200 | r = weight_radius + 0.15, |
| 201 | center = true); } } } } } |
| 202 | |
| 203 | module spin_donut(weight_radius, |
| 204 | weight_thickness, |
| 205 | bearing_radius, |
| 206 | bearing_thickness, |
| 207 | weight_lip_overhang, |
| 208 | bearing_lip_overhang, |
| 209 | wall, |
| 210 | arms) { |
| 211 | thicker_thickness = (bearing_thickness > weight_thickness) |
| 212 | ? bearing_thickness : weight_thickness; |
| 213 | height = thicker_thickness + wall * 2; |
| 214 | |
| 215 | center_to_arm_center = bearing_radius + wall + weight_radius; |
| 216 | |
| 217 | jelly_filled(height, bearing_radius); |
| 218 | for(arm = [0 : arms]) { |
| 219 | rotate(arm * (360 / arms)) { |
| 220 | translate([center_to_arm_center, 0, 0]) { |
| 221 | jelly_filled(height, weight_radius); } } } } |
| 222 | |
| 223 | /* |
| 224 | This file is part of 3d-printables. |
| 225 | |
| 226 | 3d-printables is free software: you can redistribute it and/or modify |
| 227 | it under the terms of the GNU Affero General Public License as published by |
| 228 | the Free Software Foundation, either version 3 of the License, or |
| 229 | (at your option) any later version. |
| 230 | |
| 231 | 3d-printables is distributed in the hope that it will be useful, |
| 232 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 233 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 234 | GNU Affero General Public License for more details. |
| 235 | |
| 236 | You should have received a copy of the GNU Affero General Public License |
| 237 | along with challenge-bot. If not, see <http://www.gnu.org/licenses/>. |
| 238 | */ |