A high-mobility vehicle inspired by Brian Davis's LNE and the iRobot Packbot.
About this creation
This vehicle employs two pairs of treads with an articulation in the middle. The treads are in-line, such that the degree of movement of the articulated unit (unit without the NXT) is a mere 180 degrees as compared to Packbot's 360+ degree movement.
The NXT HM, however, still allows a great range of movement and easily conquers high bumps and even staircases.
A close-up of the articulated unit displays its workings. A set of gears tranfers power from the two drive motors between all four treads. To raise or lower the articulated unit, a single motor is moved. Because the weight of the rear unit is greater than that of the front articulated one, the motor raises itself and the articulated unit alongside it.
An aerial view of NXT HM showcases its aesthete.
Another view of the articulated unit's movement, and how the front treads are connected to the C motor. The rotary end of the C motor is attached to the rear unit so that the motor lifts only the articulated, front unit.
The weight of the NXT in the back helps the C motor (the articulation motor) to keep the rear end stable, such that it only moves the front unit.
A bird's-eye view of NXT HM displays its relatively compact base.
The motor which powers the articulated unit does not interfere with the drive. Because it moves the entire front unit as one whole, it is difficult to break the front articulated unit.
the NXT remote is a really neat thing, i don't tend to build fully autonomnous robots anymore because of it. cool concept, i've tried this kind of thing before, but it never really works for me. Also, check out some of my NXT creations, they may give you some ideas.
Quoting Jay O'Bee
Ya, the concept is unbeatable, but I see that you don't have any sensors hooked up to that thing. What's up with that?
The vehicle is remotely operated with Anders Soborg's bluetooth vehicle remote. I know that this essentially means it's no longer a robot, but I'm fond of the flexibility that remote control gives me. Also, employing sensors would make it difficult for the articulated concept to have any purpose; an unmanned vehicle built with NXT would be very difficult to program, if not impossible, to know when to climb over objects or when it's losing traction. Thanks for the comment!