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1 | /* |
2 | Copyright (C) 2015 Daniel Watson |
3 | See the end of the file for license conditions. |
4 | */ |
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5 | // challenge-bot |
6 | // GNU AGPLv3 (or later at your option) |
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7 | // project available here: |
8 | // https://challenge-bot.com/ |
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9 | |
10 | use <oshw.scad> |
11 | |
12 | // use 10 ish for development, 60 or so for printing |
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13 | $fn = 100; |
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14 | |
15 | /* measured with calipers */ |
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16 | ball_diameter = 11 + 0.85; // extra bit added for printing imprecision |
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17 | ball_radius = ball_diameter / 2; |
18 | |
19 | standoff_height = 60; // kyle eyeballed |
20 | |
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21 | /* |
22 | notes on printing: |
23 | * slow down just before top solid infill of deck flange |
24 | * slow down just before switching from solid to forked portion of standoff |
25 | */ |
26 | |
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27 | gap = 3; |
28 | wall_thickness = 1; |
29 | holder_floor = 3; |
30 | holder_arms_length = 20; |
31 | holder_height = |
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32 | holder_floor + holder_arms_length + (3 / 4) * ball_diameter; |
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33 | |
34 | holder_radius = ball_radius + wall_thickness; |
35 | holder_diameter = holder_radius * 2; |
36 | |
37 | standoff_radius = holder_radius; // 0.580 / 2 inches from spec sheet |
38 | standoff_lower_portion_height = standoff_height - holder_height; |
39 | |
40 | // eyeballed caster flange height, (0.580/5) inches, times 2 to be stronger |
41 | caster_flange_height = 5; |
42 | caster_flange_width = 20.32; // 0.800 inches |
43 | |
44 | deck_pitch = 25.4; // measured center to center on grid on pegboard |
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45 | deck_pitch_diagonal = sqrt(2 * pow(deck_pitch, 2)); |
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46 | deck_flange_height = 2.9464; |
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47 | deck_flange_screw_radius = 3.556 / 2 + 0.4; // For #6 machine screws |
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48 | deck_flange_radius = (deck_pitch) / 2 + deck_flange_screw_radius + 3; |
49 | |
50 | module deck_flange() { |
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51 | cylinder(h = deck_flange_height, r = holder_radius + 2); |
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52 | difference() { |
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53 | scale([0.40, 0.40, 1]) { |
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54 | linear_extrude(height = deck_flange_height) { |
55 | oshw(); } } |
56 | for (ii = [-1, 1]) { |
57 | translate([deck_pitch_diagonal / 2 * ii, 0, -.1]) |
58 | cylinder(h = deck_flange_height * 1.1, |
59 | r = deck_flange_screw_radius); } |
60 | translate([0, deck_pitch_diagonal / 2, -.1]) |
61 | cylinder(h = deck_flange_height * 1.1, |
62 | r = deck_flange_screw_radius); } } |
63 | |
64 | module deck_flange_reinforcement() { |
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65 | translate([0, 0, deck_flange_height]) { |
66 | rotate([90, 0, 0]) { |
67 | translate([holder_radius - 0.5, 0, -deck_flange_height / 2]) { |
68 | linear_extrude(height = deck_flange_height) { |
69 | polygon([[0, 0], |
70 | [0, standoff_lower_portion_height], |
71 | [(deck_pitch_diagonal / 2 - holder_radius), |
72 | 0]]); } } } } } |
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73 | |
74 | module ball_holder() { |
75 | difference() { |
76 | union() { |
77 | cylinder(r = holder_radius, h = holder_height); |
78 | translate([0, 0, holder_arms_length]) { |
79 | cylinder(r1 = holder_radius, |
80 | r2 = holder_radius + wall_thickness, |
81 | h = wall_thickness); |
82 | translate([0, 0, wall_thickness]) { |
83 | cylinder(r = wall_thickness + holder_radius, |
84 | h = holder_height |
85 | - holder_arms_length |
86 | - wall_thickness); } } } |
87 | translate([0, 0, ball_radius + holder_floor + holder_arms_length]) { |
88 | sphere(r = ball_radius); } |
89 | translate([0, 0, holder_floor + (holder_height - holder_floor) / 2 + 0.5]) { |
90 | cube([holder_diameter + wall_thickness * 2 + 0.1, |
91 | gap, |
92 | holder_height - holder_floor + 0.1], |
93 | center = true); } } } |
94 | |
95 | module caster_standoff() { |
96 | cylinder(h = standoff_lower_portion_height, |
97 | r = standoff_radius); |
98 | deck_flange(); |
99 | for (ii = [0:3]) { |
100 | rotate([0, 0, 45 + 90 * ii]) |
101 | deck_flange_reinforcement(); } |
102 | translate([0, 0, standoff_lower_portion_height]) { |
103 | ball_holder(); } } |
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104 | |
105 | /* |
106 | This file is part of challenge-bot. |
107 | |
108 | Challenge-bot is free software: you can redistribute it and/or modify |
109 | it under the terms of the GNU Affero General Public License as published by |
110 | the Free Software Foundation, either version 3 of the License, or |
111 | (at your option) any later version. |
112 | |
113 | GNU Affero Emacs is distributed in the hope that it will be useful, |
114 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
115 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
116 | GNU Affero General Public License for more details. |
117 | |
118 | You should have received a copy of the GNU Affero General Public License |
119 | along with challenge-bot. If not, see <http://www.gnu.org/licenses/>. |
120 | */ |