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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 | standoff_radius = 14.732 / 2; // 0.580 / 2 inches from spec sheet |
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11 | standoff_height = 48; // eyeballed |
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12 | |
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13 | nut_short_side = 4.7; // from calipers |
14 | nut_height = 1.6; // from calipers |
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15 | |
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16 | // eyeballed caster flange height, (0.580/5) inches, times 2 to be stronger |
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17 | caster_flange_height = 5; |
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18 | caster_flange_width = 20.32; // 0.800 inches |
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19 | caster_flange_screw_radius = 2.286 / 2; // 0.090 inches |
20 | caster_flange_screw_length = 8; // eyeballed |
21 | |
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22 | deck_grid_width = 25.4; // measured center to center on grid on pegboard |
23 | deck_flange_height = 2.9464; |
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24 | deck_flange_screw_radius = 3.556 / 2; // For #6 machine screws |
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25 | deck_flange_radius = (deck_grid_width) / 2 + deck_flange_screw_radius + 3; |
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26 | |
27 | module deck_flange(){ |
28 | difference(){ |
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29 | cylinder(h = deck_flange_height, r = deck_flange_radius); |
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30 | for(ii = [-1, 1]){ |
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31 | translate([deck_grid_width / 2 * ii, 0, -.1]) |
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32 | cylinder(h = deck_flange_height * 1.1, |
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33 | r = deck_flange_screw_radius); |
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34 | translate([0, deck_grid_width / 2 * ii, -.1]) |
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35 | cylinder(h = deck_flange_height * 1.1, |
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36 | r = deck_flange_screw_radius);}}} |
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37 | |
38 | module deck_flange_reinforcement(){ |
39 | translate([-deck_flange_radius, |
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40 | -.5 * deck_flange_height / 2, |
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41 | deck_flange_height]){ |
42 | difference (){ |
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43 | cube([deck_flange_radius, deck_flange_height / 2, deck_flange_radius]); |
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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, |
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53 | r = caster_flange_screw_radius); |
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54 | translate([-standoff_radius, 0, 0]) |
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55 | cylinder(h = caster_flange_screw_length, |
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56 | r = caster_flange_screw_radius);} |
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57 | |
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58 | module caster_flange(){ |
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59 | side_radius = caster_flange_width / 2 - standoff_radius; |
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60 | hull(){ |
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61 | cylinder(h = caster_flange_height, r = standoff_radius); |
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62 | translate([standoff_radius, 0, 0]) |
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63 | cylinder(h = caster_flange_height, r = side_radius); |
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64 | translate([-standoff_radius, 0, 0]) |
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65 | cylinder(h = caster_flange_height, r = side_radius);}} |
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66 | |
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67 | module nut(size, height){ |
68 | width = size/1.75; |
69 | for (r = [-60, 0, 60]) rotate([0,0,r]) cube([width, size, height], true);} |
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70 | |
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71 | module nuts(){ |
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72 | translate([standoff_radius, 0, nut_height/2]) |
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73 | nut(nut_short_side, nut_height + .1); |
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74 | translate([-standoff_radius, 0, nut_height/2]) |
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75 | nut(nut_short_side, nut_height + .1);} |
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76 | |
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77 | module _2_screw(){ |
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78 | //measured with calipers |
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79 | screw_length = 8; |
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80 | thread_radius = 2.17 / 2 - 0.1; // subtract 0.1 to make squeeze fit |
81 | head_height = 1.8; |
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82 | head_radius = 4.1 / 2 + 0.2; // add 0.2 to allow head to fit |
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83 | cylinder(r = thread_radius, h = screw_length); |
84 | cylinder(r = head_radius, h = head_height);} |
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85 | |
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86 | module caster_deck_interlock_solid(){ |
87 | translate([-1, standoff_radius - 2.1, 0]){ |
88 | cube([2, 2, standoff_height]);} |
89 | translate([-1, -standoff_radius + 0.1, 0]){ |
90 | cube([2, 2, standoff_height]);}} |
91 | |
92 | module caster_deck_interlock_hole(){ |
93 | translate([0, standoff_radius - 1, -0.1]){ |
94 | cube([2.5, 2.5, standoff_height], center = true);} |
95 | translate([0, -standoff_radius + 1, -0.1]){ |
96 | cube([2.5, 2.5, standoff_height], center = true);}} |
97 | |
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98 | module caster_standoff_deck_side(){ |
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99 | difference(){ |
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100 | cylinder(h = standoff_height - caster_flange_height, |
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101 | r = standoff_radius); |
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102 | translate([0, 0, standoff_height - caster_flange_screw_length * 1.1 + 0.1]) |
103 | scale([1, 1, 1.1]) |
104 | caster_flange_screws(); |
105 | translate([0, 0, standoff_height - (caster_flange_height + nut_height)]) |
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106 | nuts(); |
107 | translate([0, 0, standoff_height]){ |
108 | // make hole to get to screw head depth |
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109 | cylinder(r = 4.1 / 2 + 0.2, h = 3, center = true); |
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110 | translate([0, 0, -0.7]) |
111 | rotate([180, 0, 0]) |
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112 | _2_screw(r = 0.5, h = 5);}} |
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113 | deck_flange(); |
114 | for(ii = [0:3]){ |
115 | rotate([0, 0, 45 + 90 * ii]) |
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116 | deck_flange_reinforcement();} |
117 | caster_deck_interlock_solid();} |
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118 | |
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119 | module caster_standoff_caster_side(){ |
120 | difference(){ |
121 | caster_flange(); |
122 | translate([0, 0, caster_flange_height - 0.7]){ |
123 | rotate([180, 0, 0]){ |
124 | _2_screw();}} |
125 | // make hole to get to screw head |
126 | translate([0, 0, caster_flange_height - 0.8]){ |
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127 | cylinder(r = 4.1 / 2 + 0.2, h = 10);} |
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128 | translate([0, 0, -.1]){ |
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129 | caster_flange_screws();} |
130 | caster_deck_interlock_hole();}} |
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131 | |
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132 | caster_standoff_deck_side(); |
133 | translate([caster_flange_width / 2 + deck_flange_radius + 1, 0, 0]){ |
134 | caster_standoff_caster_side();} |