| 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 fillet(r) { |
| 70 | offset(r = -r) { offset(delta = r) { children(); } } } |
| 71 | |
| 72 | module spin_footprint(weight_radius, |
| 73 | bearing_radius, |
| 74 | round_extra, |
| 75 | wall, |
| 76 | arms) { |
| 77 | thinner_radius = (bearing_radius < weight_radius)? |
| 78 | bearing_radius : weight_radius; |
| 79 | fillet(thinner_radius) { |
| 80 | for(arm = [0 : arms - 1]) { |
| 81 | hull() { |
| 82 | circle(bearing_radius + round_extra); |
| 83 | rotate( (arm / arms) * 360 ) { |
| 84 | translate([bearing_radius + wall + weight_radius, 0]) { |
| 85 | circle(weight_radius + round_extra); } } } } } } |
| 86 | |
| 87 | module mirrored(axis) { |
| 88 | children(); |
| 89 | mirror(axis) children(); } |
| 90 | |
| 91 | module spin(weight_radius, |
| 92 | weight_thickness, |
| 93 | bearing_radius, |
| 94 | bearing_thickness, |
| 95 | weight_lip_overhang = 0.3, |
| 96 | bearing_lip_overhang = 0.3, |
| 97 | wall = 3, |
| 98 | arms = 3) { |
| 99 | layer_height = 0.15; |
| 100 | thicker_thickness = (bearing_thickness > weight_thickness) ? |
| 101 | bearing_thickness : weight_thickness; |
| 102 | calculated_height = thicker_thickness + 2 * wall; |
| 103 | layers = 2 * ceil(ceil(calculated_height / layer_height) / 2); |
| 104 | actual_height = layers * layer_height; |
| 105 | round_radius = actual_height / 2; |
| 106 | |
| 107 | mirrored([0, 0, 1]) { |
| 108 | for(layer = [0 : (layers / 2) - 1]) { |
| 109 | translate([0, 0, layer * layer_height - actual_height / 2]) { |
| 110 | linear_extrude(height = layer_height) { |
| 111 | adjacent = round_radius - (layer * layer_height); |
| 112 | angle = acos(adjacent / round_radius); |
| 113 | round_extra = adjacent * tan(angle); |
| 114 | spin_footprint(weight_radius, |
| 115 | bearing_radius, |
| 116 | round_extra, |
| 117 | wall, |
| 118 | arms); } } } } } |
| 119 | |
| 120 | /* |
| 121 | This file is part of 3d-printables. |
| 122 | |
| 123 | 3d-printables is free software: you can redistribute it and/or modify |
| 124 | it under the terms of the GNU Affero General Public License as published by |
| 125 | the Free Software Foundation, either version 3 of the License, or |
| 126 | (at your option) any later version. |
| 127 | |
| 128 | 3d-printables is distributed in the hope that it will be useful, |
| 129 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 130 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 131 | GNU Affero General Public License for more details. |
| 132 | |
| 133 | You should have received a copy of the GNU Affero General Public License |
| 134 | along with challenge-bot. If not, see <http://www.gnu.org/licenses/>. |
| 135 | */ |