A transport apparatus including a frame, a drive section connected to the frame, the drive section having at least one drive axis, at least one arm having an end effector configured for holding a substrate, the at least one arm being connected to the drive section by a transmission link and having at least one degree of freedom axis effecting extension and retraction of the end effector with respect to the at least one arm, and a bearing connected to the frame and the end effector, the bearing defining a guideway that defines the at least one degree of freedom axis.