leg-sbnr.JPG (24832 bytes)
An unofficial Lego® Web Site

Three Legged Robot

  In my first attempt at a walker I tried to imitate a small bug. I planned for six to eight legs, that set the feet on the ground, and pushed them back backwards. The result was very complex. So much so that most of my free gears (those not used in other models) were used up with only two legs. The design changed to only include three legs.


  To move, first the legs are rotated forward. The hinge to do this is about 10 knobs from the end of the legs. As they are rotated forward, the legs lower to the ground. At the forward most point they lift the walker off the ground.
  Next the legs are rotated toward the rear, which propels the robot forward. At the rear most point they legs put the robot on the ground, and the cycle is repeated.



  The major accomplishment behind this model was the transfer of the rotary power from one Lego motor to the motion of four different hinges. The motor had to drive the two legs backwards and forwards, and the feet up and down, at the correct speed for the robot to function at all. This proved to be quite a challenge.

  In the end, the complexity of the gearing proved to be his down fall. Getting all the gears to work at the correct time, could prove to be almost impossible, and sometimes more time was spent tweaking his legs that watching him walk.


Home ] Large Scale Models ] Misc ] Robotics ] Space ] Trains ] Parables ] Other Lego Sites ]

All images are property of Lewis Valentine and can not be duplicated without consent.
Copyright Lewis Valentine ©2000

Lego® is a trademark of the Lego® Group of companies which does not sponsor, authorize or endorse this site. Any Ideas or views expressed in this page are not the views of Lego®, and are not directly or indirectly supported by INTERLEGO AG.