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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_radius = 14.732 / 2; // 0.580 / 2 inches from spec sheet |
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8 | standoff_height = 55; // eyeballed |
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9 | |
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10 | nut_short_side = 4.7; // from calipers |
11 | nut_height = 1.6; // from calipers |
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12 | |
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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 |
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16 | caster_flange_screw_radius = 2.286 / 2; // 0.090 inches |
17 | caster_flange_screw_length = 8; // eyeballed |
18 | |
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19 | deck_grid_width = 17.4; // guessing |
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20 | deck_flange_height = 2.9464 * 2; |
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21 | deck_flange_screw_radius = 3.556 / 2; // For #6 machine screws |
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22 | deck_flange_radius = deck_grid_width * 1.5; |
23 | |
24 | module deck_flange(){ |
25 | difference(){ |
26 | cylinder(h = deck_flange_height, r = deck_flange_radius); |
27 | for(ii = [-1, 1]){ |
28 | translate([deck_grid_width * ii, 0, -.1]) |
29 | cylinder(h = deck_flange_height * 1.1, |
30 | r = deck_flange_screw_radius, |
31 | $fn = 20);} |
32 | for(ii = [-1, 1]){ |
33 | translate([0, deck_grid_width * ii, -.1]) |
34 | cylinder(h = deck_flange_height * 1.1, |
35 | r = deck_flange_screw_radius, |
36 | $fn = 20);}}} |
37 | |
38 | module deck_flange_reinforcement(){ |
39 | translate([-deck_flange_radius, |
40 | -.5 * deck_flange_height, |
41 | deck_flange_height]){ |
42 | difference (){ |
43 | cube([deck_flange_radius, deck_flange_height, deck_flange_radius]); |
44 | translate([-.1, -.05 * deck_flange_height, 0]){ |
45 | rotate([0, -45, 0]){ |
46 | cube([deck_flange_radius * 1.5, // 1.5 is bigger than sqrt(2) |
47 | deck_flange_height * 1.1, // 1.1 is bigger than 1 |
48 | deck_flange_radius]);}}}}} |
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49 | |
50 | module caster_flange_screws(){ |
51 | translate([standoff_radius, 0, 0]) |
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52 | cylinder(h = caster_flange_screw_length, |
53 | r = caster_flange_screw_radius, |
54 | $fn = 20); |
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55 | translate([-standoff_radius, 0, 0]) |
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56 | cylinder(h = caster_flange_screw_length, |
57 | r = caster_flange_screw_radius, |
58 | $fn = 20);} |
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59 | |
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60 | module caster_flange(){ |
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61 | side_radius = caster_flange_width / 2 - standoff_radius; |
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62 | hull(){ |
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63 | cylinder(h = caster_flange_height, r = standoff_radius); |
64 | translate([standoff_radius, 0, 0]) |
65 | cylinder(h = caster_flange_height, r = side_radius); |
66 | translate([-standoff_radius, 0, 0]) |
67 | cylinder(h = caster_flange_height, r = side_radius);}} |
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68 | |
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69 | module nut(size, height){ |
70 | width = size/1.75; |
71 | for (r = [-60, 0, 60]) rotate([0,0,r]) cube([width, size, height], true);} |
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72 | |
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73 | module nuts(){ |
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74 | translate([standoff_radius, 0, nut_height/2]) |
75 | nut(nut_short_side, nut_height); |
76 | translate([-standoff_radius, 0, nut_height/2]) |
77 | nut(nut_short_side, nut_height);} |
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78 | |
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79 | module caster_standoff(){ |
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80 | difference(){ |
81 | union(){ |
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82 | cylinder(h = standoff_height, r = standoff_radius); |
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83 | translate([0, 0, standoff_height - caster_flange_height]) |
84 | caster_flange();} |
85 | translate([0, 0, standoff_height - caster_flange_screw_length * 1.1 + 0.1]) |
86 | scale([1, 1, 1.1]) |
87 | caster_flange_screws(); |
88 | translate([0, 0, standoff_height - (caster_flange_height + nut_height)]) |
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89 | nuts();} |
90 | deck_flange(); |
91 | for(ii = [0:3]){ |
92 | rotate([0, 0, 45 + 90 * ii]) |
93 | deck_flange_reinforcement();}} |
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94 | |
95 | caster_standoff(); |