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1 | // challenge-bot |
2 | // GNU AGPLv3 (or later at your option) |
3 | // project available at these locations: |
4 | // https://gitorious.org/ozzloy/challenge-bot |
5 | // https://github.com/waynegramlich/challenge-bot |
6 | |
6b308c7a |
7 | use <oshw.scad> |
8 | |
2b2202ff |
9 | // use 10 ish for development, 60 or so for printing |
10 | $fn = 60; |
5063fec3 |
11 | |
6a7062ce |
12 | /* measured with calipers */ |
c42ac369 |
13 | ball_diameter = 12.7 + 0.80; // extra bit added for printing imprecision |
6a7062ce |
14 | ball_radius = ball_diameter / 2; |
15 | |
6b308c7a |
16 | standoff_height = 60; // kyle eyeballed |
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17 | |
6a7062ce |
18 | wall_thickness = 1; |
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19 | holder_floor = 3; |
6b308c7a |
20 | holder_arms_length = 20; |
46516c11 |
21 | holder_height = |
22 | holder_floor + holder_arms_length + (11 / 16) * ball_diameter; |
6a7062ce |
23 | |
24 | holder_radius = ball_radius + wall_thickness; |
25 | holder_diameter = holder_radius * 2; |
26 | |
27 | standoff_radius = holder_radius; // 0.580 / 2 inches from spec sheet |
aa19128c |
28 | standoff_lower_portion_height = standoff_height - holder_height; |
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29 | |
6bb05589 |
30 | // eyeballed caster flange height, (0.580/5) inches, times 2 to be stronger |
7a0bd024 |
31 | caster_flange_height = 5; |
6bb05589 |
32 | caster_flange_width = 20.32; // 0.800 inches |
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33 | caster_flange_screw_radius = 2.286 / 2; // 0.090 inches |
34 | caster_flange_screw_length = 8; // eyeballed |
35 | |
89da9d5e |
36 | deck_pitch = 25.4; // measured center to center on grid on pegboard |
969236b8 |
37 | deck_flange_height = 2.9464; |
cbc5ea88 |
38 | deck_flange_screw_radius = 3.556 / 2; // For #6 machine screws |
89da9d5e |
39 | deck_flange_radius = (deck_pitch) / 2 + deck_flange_screw_radius + 3; |
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40 | |
41 | module deck_flange(){ |
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42 | deck_pitch_diagonal = sqrt(2 * pow(deck_pitch, 2)); |
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43 | difference(){ |
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44 | scale([0.35, 0.35, 1]){ |
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45 | linear_extrude(height = deck_flange_height){ |
46 | oshw();}} |
4b158a5e |
47 | for(ii = [-1, 1]){ |
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48 | translate([deck_pitch_diagonal / 2 * ii, 0, -.1]) |
4b158a5e |
49 | cylinder(h = deck_flange_height * 1.1, |
17891d41 |
50 | r = deck_flange_screw_radius);} |
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51 | translate([0, deck_pitch_diagonal / 2, -.1]) |
17891d41 |
52 | cylinder(h = deck_flange_height * 1.1, |
53 | r = deck_flange_screw_radius);}} |
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54 | |
55 | module deck_flange_reinforcement(){ |
56 | translate([-deck_flange_radius, |
969236b8 |
57 | -.5 * deck_flange_height / 2, |
4b158a5e |
58 | deck_flange_height]){ |
59 | difference (){ |
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60 | cube([deck_flange_radius, deck_flange_height / 2, deck_flange_radius]); |
4b158a5e |
61 | translate([-.1, -.05 * deck_flange_height, 0]){ |
62 | rotate([0, -45, 0]){ |
63 | cube([deck_flange_radius * 1.5, // 1.5 is bigger than sqrt(2) |
64 | deck_flange_height * 1.1, // 1.1 is bigger than 1 |
65 | deck_flange_radius]);}}}}} |
6bb05589 |
66 | |
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67 | module ball_holder(){ |
6a7062ce |
68 | gap = wall_thickness * 4; |
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69 | difference (){ |
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70 | cylinder(r = holder_radius, h = holder_height); |
71 | translate([0, 0, ball_radius + holder_floor + holder_arms_length]){ |
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72 | sphere(r = ball_radius);} |
ea032771 |
73 | translate([0, 0, holder_floor + (holder_height - holder_floor) / 2 + 0.5]){ |
74 | cube([holder_diameter + 0.1, gap, holder_height - holder_floor + 0.1], |
5455dacb |
75 | center = true);}}} |
76 | |
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77 | module caster_standoff(){ |
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78 | cylinder(h = standoff_lower_portion_height, |
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79 | r = standoff_radius); |
80 | deck_flange(); |
81 | for(ii = [0:3]){ |
82 | rotate([0, 0, 45 + 90 * ii]) |
83 | deck_flange_reinforcement();} |
aa19128c |
84 | translate([0, 0, standoff_lower_portion_height]){ |
35552d31 |
85 | ball_holder();}} |
86 | |
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87 | caster_standoff(); |