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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 = |
19 | sqrt(2 * pow(wheel_square_spoke_size / 2, 2)) + wall_width / 2 + 1; |
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20 | |
21 | motor_shaft_radius = 3.7; |
22 | motor_shaft_flat_width = 4.8; |
23 | |
24 | tread_radius = 4 / 2; |
25 | |
26 | module mounting_screw_flat() { |
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27 | circle(1.1); } |
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28 | |
29 | module motor_shaft_flat(radius, flat_width) { |
30 | intersection() { |
31 | circle(radius); |
32 | square([flat_width, radius * 2], center = true); } } |
33 | |
34 | module motor_shaft(radius, |
35 | flat_width, |
36 | shaft_length) { |
37 | linear_extrude(height = shaft_length) { |
38 | motor_shaft_flat(radius, flat_width); } } |
39 | |
40 | module rim(radius, wall_width, wheel_width) { |
41 | linear_extrude(height = wheel_width) { |
42 | difference() { |
43 | circle(radius); |
44 | circle(radius - wall_width); } } } |
45 | |
46 | module motor_shaft_holder_flat(radius, flat_width, wall_width) { |
47 | difference() { |
48 | motor_shaft_flat(radius + wall_width, |
49 | flat_width + wall_width); |
50 | motor_shaft_flat(radius, flat_width); } } |
51 | |
52 | module motor_shaft_holder(radius, flat_width, wall_width, height) { |
53 | linear_extrude(height = height) { |
54 | motor_shaft_holder_flat(radius, flat_width, wall_width); } } |
55 | |
56 | module tread(wheel_radius, tread_radius) { |
57 | rotate_extrude(convexity = 10) { |
58 | translate([wheel_radius, 0]) { |
59 | circle(tread_radius); } } } |
60 | |
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61 | module wheel(radius, |
62 | width, |
63 | shaft_radius, |
64 | shaft_flat_width, |
65 | wall_width, |
66 | tread_radius) { |
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67 | difference() { |
68 | rim(radius, wall_width * 2, width); |
69 | translate([0, 0, width / 2]) { |
70 | tread(radius, tread_radius); } } |
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71 | linear_extrude(height = wheel_square_spoke_thickness) { |
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72 | difference() { |
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73 | square(wheel_square_spoke_size, center = true); |
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74 | mounting_screw_flat(); } } |
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75 | translate([0, 0, wheel_square_spoke_thickness]) { |
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76 | motor_shaft_holder(shaft_radius, |
77 | shaft_flat_width, |
78 | wall_width, |
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79 | width - wheel_square_spoke_thickness); } } |