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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 $fn = 20 while developing, 100 when about to print |
8 | // 20 will make previews fast |
9 | // 100 will make printing smooth |
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10 | $fn = 100; |
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11 | |
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12 | wheel_depth = 6; |
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13 | wheel_radius = 130/2; |
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14 | |
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15 | module encoder_shaft(){ |
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16 | // measured with calipers, checked against the motor shaft |
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17 | motor_shaft_big = 3.7; // radius, gets doubled in cylinder |
18 | motor_shaft_small = 4.8; // total length of box |
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19 | motor_shaft_length = wheel_depth * 3 / 4; |
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20 | |
21 | intersection(){ |
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22 | cylinder(h = motor_shaft_length, r = motor_shaft_big, center = true); |
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23 | // x direction is multiplied by 2 because the radius of the cylinder |
24 | // goes in both directions. the extra .1 is for overlap |
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25 | cube([motor_shaft_big * 2.1, motor_shaft_small, motor_shaft_length], |
26 | center = true);}} |
27 | |
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28 | module mounting_screw(){ |
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29 | cylinder(h = wheel_depth * 1.1, r = 1, center = true);} |
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30 | |
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31 | module wheel(){ |
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32 | translate([0, 0, wheel_depth / 2]){ |
33 | difference(){ |
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34 | cylinder(h = wheel_depth, r = wheel_radius, center = true); |
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35 | translate([0, 0, wheel_depth / 4]){ |
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36 | scale([1, 1, 1.1]){ |
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37 | encoder_shaft();}} |
38 | mounting_screw(); |
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39 | for(i = [1 : 5]){ |
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40 | rotate(i * 360/5, [0, 0, 1]){ |
41 | translate([0, 0, -0.6 * wheel_depth]) |
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42 | between_spokes();}} |
43 | translate([0, 0, wheel_depth / 4]){ |
44 | difference(){ |
45 | cylinder(h = wheel_depth / 1.2, |
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46 | r = wheel_radius - 3, |
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47 | center = true); |
48 | cylinder(h = wheel_depth / 1.2, |
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49 | r = 6, |
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50 | center = true);}}}}} |
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51 | |
52 | module wheel_block(){ |
53 | cube([wheel_radius, wheel_radius, wheel_depth]);} |
54 | |
55 | module pie_slice(){ |
56 | intersection(){ |
57 | translate([0, 0, wheel_depth / 2]){ |
58 | cylinder(h = wheel_depth, |
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59 | r = wheel_radius - 4, |
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60 | center = true);} |
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61 | translate([0, wheel_radius * 0.15, 0]){ |
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62 | rotate([0, 0, (360 / 5) / 2]){ |
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63 | intersection(){ |
64 | wheel_block(); |
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65 | rotate([0, 0, 90 - 360 / 5]) |
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66 | wheel_block();}}}}} |
67 | |
68 | module between_spokes(){ |
69 | minkowski(){ |
70 | pie_slice(); |
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71 | cylinder(h = wheel_depth / 2, r = 1);}} |
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72 | |
73 | wheel(); |