Walking machines have been attempted since the beginning of the technology of transportation machinery with the aim to overpass the limits of wheeled systems by looking at legged solutions in nature. But only since the last part of the 20-th century very efficient walking machines have been conceived, designed, and built with good performances that are suitable for practical appli-cations carrying significant payload with relevant flexibility and versatility. In this chapter we have presented a survey of the variety of current solutions and prototypes of walking machines and we have illustrated fundamental characteristics and problems for their design and operation. The worldwide feasibility of walking machines is presented by discussing the activity at LARM: Laboratory of Robotics and Mechatronics in Cassino (Italy) as concerning with low-cost easy-operation solutions that can really make the walking machines available to non expert users for many applications.

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