Stair Climbing Rover

prusaprinters

<p>My robot from the Danish <a href="https://robocup.dtu.dk/">DTU RoboCup</a> competition. The rover was made specifically to solve the stair climbing obstacle. It is built on a rocker-bogie design, making the stair climbing quite easy. See the videos of the robot in the competition below.</p><p>It was inspired by the great design of this <a href="https://www.thingiverse.com/thing:1318414">Martian Rover</a>. It is however redrawn completely in order to make it possible to turn all wheels separately. Also, I wanted the motors to be inside the wheels, and all wires to be hidden inside the arms. The differential between the two main arms is inside the enclosure to keep the top free for future additions. The main frame has mounting holes all the way around making it easy to mount things inside the enclosure.</p><p>The design here is missing a few details, like the mount for the camera and a Raspberry Pi. I assume that if anyone want to make this, they will adopt these features for their own needs.</p><p>The robot is assembled mostly with M3 nuts and bolts. The arms are supported by a long M8 threaded rod. The top lid attaches with magnets. The fully assembled robot is about &nbsp;430x330x220 mm (LxWxH).</p><ul><li>Motors: 25GA370 DC 6V Micro Gear Motor, 130RPM, 1:46.8</li><li>Couplers: Chihai Motor 4 mm Rigid Flange Coupling</li><li>Servos: TGY-R5180MG</li><li>Tires: BS701-002T (103 mm OD, 72 mm ID, 42 mm width)</li></ul><p>Note that the servos I used may be a bit underpowered if used in rough terrain. On smooth surfaces they are sufficient.</p><p>For some accessories see this <a href="https://www.printables.com/social/266538-wildwilly/collections/167873">collection</a>.</p><h3>Printing</h3><p>Look at the filenames to determine how many times you need to print each item.&nbsp;<br>1x_1xm_ means print one time as-is and one time mirrored.</p><p>The largest part is the frame. If it is too large for your printer, you can most likely print it by putting it on the side, and placing it diagonally on the bed. Also, cut it in two, like I did in the assembly video. That way it can be printed without support.</p><h3>Outdoor Test</h3><figure class="media"><oembed url="https://www.youtube.com/watch?v=90HxqwZaWRA"></oembed></figure><h3>Assembly Instructions</h3><figure class="media"><oembed url="https://www.youtube.com/watch?v=bXdt8hng2WM"></oembed></figure><h3>The Rover in the Competition</h3><p>First version going up the stairs:</p><figure class="media"><oembed url="https://www.youtube.com/watch?v=9Od0E53R8PE"></oembed></figure><p>Second version. Unfortunately the wooden floor was slippery, so the robot couldn't go up the stairs. Instead, it took a trip to the seesaw:</p><figure class="media"><oembed url="https://www.youtube.com/watch?v=GkBlQkr3NZU"></oembed></figure>