Abstract: A mobile mechanism, which is configured with pedrails or wheels on the top bottom and two sides of an snakelike ophidian robot, is presented . The mobile mechanism can keep the robot moving on the condition of turning over , touching obstacle on one side or going on the “V” form surface of the road. The mechanism can also applied to other mobile robots.

Key words: Mechanism, New mobile, Robot, 3D-printing, Design of sand mold, Molding sand thickness, Sand casting