The ornamental design for a part of a robotjoint having an inputflange and an outputflange, as shown and described.
FIG. 1 is a first perspective view of a robot joint having an input flange and an output flange.
FIG. 2 is a plan view of a front of the robot joint.
FIG. 3 is a plan view of a back of the robot joint.
FIG. 4 is a second perspective view of the robot joint.
FIG. 5 is a plan view of a right side of the robot joint.
FIG. 6 is a plan view of a bottom of the robot joint; and,
FIG. 7 is a third perspective view of the robot joint.
The broken or dotted lines in the figures depict portions of the robot joint having an input flange and an output flange only and form no part of the claimed design.