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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 | |
7 | // use $fn = 20 while developing, 100 when about to print |
8 | // 20 will make previews fast |
9 | // 100 will make printing smooth |
10 | $fn = 100; |
11 | |
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12 | wheel_square_spoke_size = 45; |
13 | wheel_square_spoke_thickness = 2; |
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14 | |
15 | wall_width = 3; |
16 | |
17 | wheel_width = 9; |
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18 | wheel_radius = sqrt(2 * pow(wheel_square_spoke_size / 2, 2)) + wall_width / 2; |
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19 | |
20 | motor_shaft_radius = 3.7; |
21 | motor_shaft_flat_width = 4.8; |
22 | |
23 | tread_radius = 4 / 2; |
24 | |
25 | module mounting_screw_flat() { |
26 | circle(0.9); } |
27 | |
28 | module motor_shaft_flat(radius, flat_width) { |
29 | intersection() { |
30 | circle(radius); |
31 | square([flat_width, radius * 2], center = true); } } |
32 | |
33 | module motor_shaft(radius, |
34 | flat_width, |
35 | shaft_length) { |
36 | linear_extrude(height = shaft_length) { |
37 | motor_shaft_flat(radius, flat_width); } } |
38 | |
39 | module rim(radius, wall_width, wheel_width) { |
40 | linear_extrude(height = wheel_width) { |
41 | difference() { |
42 | circle(radius); |
43 | circle(radius - wall_width); } } } |
44 | |
45 | module motor_shaft_holder_flat(radius, flat_width, wall_width) { |
46 | difference() { |
47 | motor_shaft_flat(radius + wall_width, |
48 | flat_width + wall_width); |
49 | motor_shaft_flat(radius, flat_width); } } |
50 | |
51 | module motor_shaft_holder(radius, flat_width, wall_width, height) { |
52 | linear_extrude(height = height) { |
53 | motor_shaft_holder_flat(radius, flat_width, wall_width); } } |
54 | |
55 | module tread(wheel_radius, tread_radius) { |
56 | rotate_extrude(convexity = 10) { |
57 | translate([wheel_radius, 0]) { |
58 | circle(tread_radius); } } } |
59 | |
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60 | module wheel(radius, |
61 | width, |
62 | shaft_radius, |
63 | shaft_flat_width, |
64 | wall_width, |
65 | tread_radius) { |
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66 | difference() { |
67 | rim(radius, wall_width * 2, width); |
68 | translate([0, 0, width / 2]) { |
69 | tread(radius, tread_radius); } } |
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70 | linear_extrude(height = wheel_square_spoke_thickness) { |
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71 | difference() { |
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72 | square(wheel_square_spoke_size, center = true); |
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73 | mounting_screw_flat(); } } |
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74 | translate([0, 0, wheel_square_spoke_thickness]) { |
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75 | motor_shaft_holder(shaft_radius, |
76 | shaft_flat_width, |
77 | wall_width, |
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78 | width - wheel_square_spoke_thickness); } } |