the arm that is hidden from view in fig1 also has a transversely extending pin detachable connectors comprising ball and socket joints as at 60 couple the upper ends of the forearm members to the pins still with reference to fig1 disposed at the lower ends of the six forearm members is a triangular shaped base plate 62 more particularly detachable connectors that again may comprise ball and socket joints located proximate the vertices of the triangular base plate 62 are used to couple the base plate to the lower ends of the three pairs of forearm members the detachable ball and socket joints at the lower ends of the forearm members are identified by reference numeral 64 the pins 56 58 etc are equal in length to the sides of the triangular base plate 62 such that the individual pairs of forearm members have their components in parallel spaced apart relationship projecting downwardly from the underside of the base plate 62 is an end effector assembly 66 a shaft 68 is journaled for rotation between the main casting 12 and the center of the triangular base plate 62 this shaft is adapted to be driven by a servo motor 70 mounted on the main casting through a suitable gear drive the shaft 68 has a pulley not shown disposed beneath the base plate 62 and it is coupled by.