To see videos use this links:

http://www.brickshelf.com/gallery/zblj/Crane/Videos/balancing.mov
http://www.brickshelf.com/gallery/zblj/Crane/Videos/drive_rotate.mov
http://www.brickshelf.com/gallery/zblj/Crane/Videos/lifitng_parrot.mov
http://www.brickshelf.com/gallery/zblj/Crane/Videos/moving_load.mov