Abstract: An apparatus for performing a work function on a tubular workpiece includes a support frame movable along an X-axis, a bracket on the frame movable toward and away from the workpiece along a Z-axis, a support arm mounted on the bracket for movement about a swival axis lying in the Z-direction, a carriage mounted on the arm for movement therealong in a Y-direction, a workpiece implement mounted on the carriage for movement together therewith and about a tilting axis lying in the X-direction, and the workpiece implement being capable of adjustment along its central axis, the support arm lying in a plane containing the swivel axis and perpendicular to the tilting axis.