The stretching and lateral movement of the robot arm all belong to linear motion. There are many kinds of mechanism to realize the reciprocating and linear motion of arm, such as piston oil (gas) cylinder, gear rack mechanism, screw nut mechanism and connecting rod mechanism. Because the piston oil (gas) cylinder is small in size and light in weight, it is widely used in the robot arm structure.
There are many kinds of mechanisms to realize the rotary motion of robot arm, such as vane rotary cylinder, gear drive mechanism, sprocket drive mechanism, piston cylinder and connecting rod mechanism. The most suitable bearing for robot arm is cross roller bearing. Why do you say that?
