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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 | |
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7 | // use 10 ish for development, 60 or so for printing |
8 | $fn = 60; |
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9 | |
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10 | /* measured with calipers */ |
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11 | ball_diameter = 12.7 + 0.80; // extra bit added for printing imprecision |
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12 | ball_radius = ball_diameter / 2; |
13 | |
14 | wall_thickness = 1; |
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15 | holder_floor = 3; |
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16 | holder_arms_length = 10; |
17 | holder_height = holder_floor + holder_arms_length + (3 / 4) * ball_diameter; |
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18 | |
19 | holder_radius = ball_radius + wall_thickness; |
20 | holder_diameter = holder_radius * 2; |
21 | |
22 | standoff_radius = holder_radius; // 0.580 / 2 inches from spec sheet |
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23 | standoff_height = 48 - holder_height; // eyeballed |
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24 | |
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25 | // eyeballed caster flange height, (0.580/5) inches, times 2 to be stronger |
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26 | caster_flange_height = 5; |
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27 | caster_flange_width = 20.32; // 0.800 inches |
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28 | caster_flange_screw_radius = 2.286 / 2; // 0.090 inches |
29 | caster_flange_screw_length = 8; // eyeballed |
30 | |
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31 | deck_grid_width = 25.4; // measured center to center on grid on pegboard |
32 | deck_flange_height = 2.9464; |
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33 | deck_flange_screw_radius = 3.556 / 2; // For #6 machine screws |
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34 | deck_flange_radius = (deck_grid_width) / 2 + deck_flange_screw_radius + 3; |
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35 | |
36 | module deck_flange(){ |
37 | difference(){ |
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38 | cylinder(h = deck_flange_height, r = deck_flange_radius); |
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39 | for(ii = [-1, 1]){ |
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40 | translate([deck_grid_width / 2 * ii, 0, -.1]) |
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41 | cylinder(h = deck_flange_height * 1.1, |
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42 | r = deck_flange_screw_radius); |
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43 | translate([0, deck_grid_width / 2 * ii, -.1]) |
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44 | cylinder(h = deck_flange_height * 1.1, |
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45 | r = deck_flange_screw_radius);}}} |
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46 | |
47 | module deck_flange_reinforcement(){ |
48 | translate([-deck_flange_radius, |
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49 | -.5 * deck_flange_height / 2, |
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50 | deck_flange_height]){ |
51 | difference (){ |
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52 | cube([deck_flange_radius, deck_flange_height / 2, deck_flange_radius]); |
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53 | translate([-.1, -.05 * deck_flange_height, 0]){ |
54 | rotate([0, -45, 0]){ |
55 | cube([deck_flange_radius * 1.5, // 1.5 is bigger than sqrt(2) |
56 | deck_flange_height * 1.1, // 1.1 is bigger than 1 |
57 | deck_flange_radius]);}}}}} |
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58 | |
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59 | module ball_holder(){ |
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60 | gap = wall_thickness * 4; |
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61 | difference (){ |
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62 | cylinder(r = holder_radius, h = holder_height); |
63 | translate([0, 0, ball_radius + holder_floor + holder_arms_length]){ |
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64 | sphere(r = ball_radius);} |
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65 | translate([0, 0, holder_floor + (holder_height - holder_floor) / 2 + 0.5]){ |
66 | cube([holder_diameter + 0.1, gap, holder_height - holder_floor + 0.1], |
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67 | center = true);}}} |
68 | |
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69 | module caster_standoff(){ |
70 | cylinder(h = standoff_height, |
71 | r = standoff_radius); |
72 | deck_flange(); |
73 | for(ii = [0:3]){ |
74 | rotate([0, 0, 45 + 90 * ii]) |
75 | deck_flange_reinforcement();} |
76 | translate([0, 0, standoff_height]){ |
77 | ball_holder();}} |
78 | |
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79 | //caster_standoff(); |
80 | ball_holder(); |