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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 |
13 | $fn = 60; |
14 | |
15 | /* measured with calipers */ |
16 | ball_diameter = 11 + 0.75; // extra bit added for printing imprecision |
17 | ball_radius = ball_diameter / 2; |
18 | |
19 | standoff_height = 60; // kyle eyeballed |
20 | |
21 | gap = 3; |
22 | wall_thickness = 1; |
23 | holder_floor = 3; |
24 | holder_arms_length = 20; |
25 | holder_height = |
26 | holder_floor + holder_arms_length + (11 / 16) * ball_diameter; |
27 | |
28 | holder_radius = ball_radius + wall_thickness; |
29 | holder_diameter = holder_radius * 2; |
30 | |
31 | standoff_radius = holder_radius; // 0.580 / 2 inches from spec sheet |
32 | standoff_lower_portion_height = standoff_height - holder_height; |
33 | |
34 | // eyeballed caster flange height, (0.580/5) inches, times 2 to be stronger |
35 | caster_flange_height = 5; |
36 | caster_flange_width = 20.32; // 0.800 inches |
37 | |
38 | deck_pitch = 25.4; // measured center to center on grid on pegboard |
39 | deck_flange_height = 2.9464; |
40 | deck_flange_screw_radius = 3.556 / 2; // For #6 machine screws |
41 | deck_flange_radius = (deck_pitch) / 2 + deck_flange_screw_radius + 3; |
42 | |
43 | module deck_flange() { |
44 | deck_pitch_diagonal = sqrt(2 * pow(deck_pitch, 2)); |
45 | difference() { |
46 | scale([0.35, 0.35, 1]) { |
47 | linear_extrude(height = deck_flange_height) { |
48 | oshw(); } } |
49 | for (ii = [-1, 1]) { |
50 | translate([deck_pitch_diagonal / 2 * ii, 0, -.1]) |
51 | cylinder(h = deck_flange_height * 1.1, |
52 | r = deck_flange_screw_radius); } |
53 | translate([0, deck_pitch_diagonal / 2, -.1]) |
54 | cylinder(h = deck_flange_height * 1.1, |
55 | r = deck_flange_screw_radius); } } |
56 | |
57 | module deck_flange_reinforcement() { |
58 | translate([-deck_flange_radius, |
59 | -.5 * deck_flange_height / 2, |
60 | deck_flange_height]) { |
61 | difference() { |
62 | cube([deck_flange_radius, deck_flange_height / 2, deck_flange_radius]); |
63 | translate([-.1, -.05 * deck_flange_height, 0]) { |
64 | rotate([0, -45, 0]) { |
65 | cube([deck_flange_radius * 1.5, // 1.5 is bigger than sqrt(2) |
66 | deck_flange_height * 1.1, // 1.1 is bigger than 1 |
67 | deck_flange_radius]); } } } } } |
68 | |
69 | module ball_holder() { |
70 | difference() { |
71 | union() { |
72 | cylinder(r = holder_radius, h = holder_height); |
73 | translate([0, 0, holder_arms_length]) { |
74 | cylinder(r1 = holder_radius, |
75 | r2 = holder_radius + wall_thickness, |
76 | h = wall_thickness); |
77 | translate([0, 0, wall_thickness]) { |
78 | cylinder(r = wall_thickness + holder_radius, |
79 | h = holder_height |
80 | - holder_arms_length |
81 | - wall_thickness); } } } |
82 | translate([0, 0, ball_radius + holder_floor + holder_arms_length]) { |
83 | sphere(r = ball_radius); } |
84 | translate([0, 0, holder_floor + (holder_height - holder_floor) / 2 + 0.5]) { |
85 | cube([holder_diameter + wall_thickness * 2 + 0.1, |
86 | gap, |
87 | holder_height - holder_floor + 0.1], |
88 | center = true); } } } |
89 | |
90 | module caster_standoff() { |
91 | cylinder(h = standoff_lower_portion_height, |
92 | r = standoff_radius); |
93 | deck_flange(); |
94 | for (ii = [0:3]) { |
95 | rotate([0, 0, 45 + 90 * ii]) |
96 | deck_flange_reinforcement(); } |
97 | translate([0, 0, standoff_lower_portion_height]) { |
98 | ball_holder(); } } |
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99 | |
100 | /* |
101 | This file is part of challenge-bot. |
102 | |
103 | Challenge-bot is free software: you can redistribute it and/or modify |
104 | it under the terms of the GNU Affero General Public License as published by |
105 | the Free Software Foundation, either version 3 of the License, or |
106 | (at your option) any later version. |
107 | |
108 | GNU Affero Emacs is distributed in the hope that it will be useful, |
109 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
110 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
111 | GNU Affero General Public License for more details. |
112 | |
113 | You should have received a copy of the GNU Affero General Public License |
114 | along with challenge-bot. If not, see <http://www.gnu.org/licenses/>. |
115 | */ |