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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 | standoff_height = 55; // eyeballed |
8 | nut_short_side = 4.7; // from calipers |
9 | nut_height = 1.6; // from calipers |
10 | standoff_radius = 14.732 / 2; // 0.580 / 2 inches from spec sheet |
11 | screw_radius = 2.286/2; // 0.090 inches |
12 | caster_flange_screw_length = 8; // eyeballed |
13 | // eyeballed caster flange height, (0.580/5) inches, times 2 to be stronger |
14 | caster_flange_height = 2.9464 * 2; |
15 | caster_flange_width = 20.32; // 0.800 inches |
16 | ziptie_width = 4.7625; // 3/16 inch |
17 | ziptie_height = 3; // i'm guessing |
18 | |
19 | module caster_flange_screws(){ |
20 | translate([standoff_radius, 0, 0]) |
21 | cylinder(h = caster_flange_screw_length, r = screw_radius, $fn = 20); |
22 | translate([-standoff_radius, 0, 0]) |
23 | cylinder(h = caster_flange_screw_length, r = screw_radius, $fn = 20);} |
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24 | |
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25 | module caster_flange(){ |
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26 | side_radius = caster_flange_width / 2 - standoff_radius; |
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27 | hull(){ |
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28 | cylinder(h = caster_flange_height, r = standoff_radius); |
29 | translate([standoff_radius, 0, 0]) |
30 | cylinder(h = caster_flange_height, r = side_radius); |
31 | translate([-standoff_radius, 0, 0]) |
32 | cylinder(h = caster_flange_height, r = side_radius);}} |
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33 | |
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34 | module nut(size, height){ |
35 | width = size/1.75; |
36 | for (r = [-60, 0, 60]) rotate([0,0,r]) cube([width, size, height], true);} |
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37 | |
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38 | module nuts(){ |
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39 | translate([standoff_radius, 0, nut_height/2]) |
40 | nut(nut_short_side, nut_height); |
41 | translate([-standoff_radius, 0, nut_height/2]) |
42 | nut(nut_short_side, nut_height);} |
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43 | |
44 | module ziptie(){ |
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45 | translate([-standoff_radius, -ziptie_width/2, 0]) |
46 | cube([standoff_radius * 2, ziptie_width, ziptie_height]);} |
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47 | |
48 | module caster_standoff(){ |
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49 | difference(){ |
50 | union(){ |
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51 | cylinder(h = standoff_height, r = standoff_radius); |
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52 | caster_flange();} |
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53 | translate([0, 0, -.1]) scale([1, 1, 1.1]) |
54 | caster_flange_screws(); |
55 | translate([0, 0, caster_flange_height]) |
56 | nuts(); |
57 | translate([0, 0, standoff_height * 3 / 4]) scale([1.1, 1, 1]) |
58 | ziptie(); |
59 | rotate([0, 0, 90]) translate([0, 0, standoff_height * 1 / 2]) |
60 | scale([1.1, 1, 1]) |
61 | ziptie();}} |
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62 | |
63 | caster_standoff(); |