| 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 | |
| 12 | use <qr.scad> |
| 13 | |
| 14 | qr_size = 45; |
| 15 | qr_height = 2; |
| 16 | |
| 17 | wall_width = 3; |
| 18 | |
| 19 | wheel_width = 9; |
| 20 | wheel_radius = sqrt(2 * pow(qr_size / 2, 2)) + wall_width / 2; |
| 21 | |
| 22 | motor_shaft_radius = 3.7; |
| 23 | motor_shaft_flat_width = 4.8; |
| 24 | |
| 25 | tread_radius = 4 / 2; |
| 26 | |
| 27 | module mounting_screw_flat(){ |
| 28 | circle(0.9);} |
| 29 | |
| 30 | module motor_shaft_flat(radius, flat_width){ |
| 31 | intersection(){ |
| 32 | circle(radius); |
| 33 | square([flat_width, radius * 2], center = true);}} |
| 34 | |
| 35 | module motor_shaft(radius, |
| 36 | flat_width, |
| 37 | shaft_length){ |
| 38 | linear_extrude(height = shaft_length){ |
| 39 | motor_shaft_flat(radius, flat_width);}} |
| 40 | |
| 41 | module rim(radius, wall_width, wheel_width){ |
| 42 | linear_extrude(height = wheel_width){ |
| 43 | difference(){ |
| 44 | circle(radius); |
| 45 | circle(radius - wall_width);}}} |
| 46 | |
| 47 | module motor_shaft_holder_flat(radius, flat_width, wall_width){ |
| 48 | difference(){ |
| 49 | motor_shaft_flat(radius + wall_width, |
| 50 | flat_width + wall_width); |
| 51 | motor_shaft_flat(radius, flat_width);}} |
| 52 | |
| 53 | module motor_shaft_holder(radius, flat_width, wall_width, height){ |
| 54 | linear_extrude(height = height){ |
| 55 | motor_shaft_holder_flat(radius, flat_width, wall_width);}} |
| 56 | |
| 57 | module tread(wheel_radius, tread_radius){ |
| 58 | rotate_extrude(convexity = 10){ |
| 59 | translate([wheel_radius, 0]){ |
| 60 | circle(tread_radius);}}} |
| 61 | |
| 62 | module wheel_black(radius, |
| 63 | width, |
| 64 | shaft_radius, |
| 65 | shaft_flat_width, |
| 66 | wall_width, |
| 67 | tread_radius){ |
| 68 | color("black"){ |
| 69 | difference(){ |
| 70 | rim(radius, wall_width, width); |
| 71 | translate([0, 0, width / 2]){ |
| 72 | tread(radius, tread_radius);}} |
| 73 | linear_extrude(height = qr_height){ |
| 74 | difference(){ |
| 75 | qr_black_flat(); |
| 76 | mounting_screw_flat();}} |
| 77 | translate([0, 0, qr_height]){ |
| 78 | motor_shaft_holder(shaft_radius, |
| 79 | shaft_flat_width, |
| 80 | wall_width, |
| 81 | width - qr_height);}}} |
| 82 | |
| 83 | module wheel_white(){ |
| 84 | color("white"){ |
| 85 | linear_extrude(height = qr_height){ |
| 86 | difference(){ |
| 87 | qr_white_flat(); |
| 88 | mounting_screw_flat();}}}} |
| 89 | |
| 90 | module wheel(radius, |
| 91 | width, |
| 92 | shaft_radius, |
| 93 | shaft_flat_width, |
| 94 | wall_width, |
| 95 | tread_radius){ |
| 96 | wheel_black(radius, |
| 97 | width, |
| 98 | shaft_radius, |
| 99 | shaft_flat_width, |
| 100 | wall_width, |
| 101 | tread_radius); |
| 102 | wheel_white();} |
| 103 | |
| 104 | module wheel_solid(radius, |
| 105 | width, |
| 106 | shaft_radius, |
| 107 | shaft_flat_width, |
| 108 | wall_width, |
| 109 | tread_radius){ |
| 110 | difference(){ |
| 111 | rim(radius, wall_width * 2, width); |
| 112 | translate([0, 0, width / 2]){ |
| 113 | tread(radius, tread_radius);}} |
| 114 | linear_extrude(height = qr_height){ |
| 115 | difference (){ |
| 116 | square(qr_size, center = true); |
| 117 | mounting_screw_flat(); } } |
| 118 | translate([0, 0, qr_height]){ |
| 119 | motor_shaft_holder(shaft_radius, |
| 120 | shaft_flat_width, |
| 121 | wall_width, |
| 122 | width - qr_height);}} |
| 123 | |
| 124 | /* |
| 125 | wheel(wheel_radius, |
| 126 | wheel_width, |
| 127 | motor_shaft_radius, |
| 128 | motor_shaft_flat_width, |
| 129 | wall_width, |
| 130 | tread_radius); |
| 131 | */ |
| 132 | |
| 133 | wheel_solid(wheel_radius, |
| 134 | wheel_width, |
| 135 | motor_shaft_radius, |
| 136 | motor_shaft_flat_width, |
| 137 | wall_width, |
| 138 | tread_radius); |