Tooling apparatus for modifying nuclear reactors

This patent describes support apparatus for supporting and selectively locating a tool with respect to its work piece, and the work piece having first and second dimensions. It comprises a tool carriage for receiving the tool; a support structure for supporting and guiding the tool carriage with respect to the workpiece; first drive means mounted on the support structure and coupled to the tool carriage for selectively driving the tool carriage along the first dimension; rail means mounted on the tool carriage along the second dimension; a support table mounted for movement along the rail means; second drive means mounted on the tool carriage selectively driving the tool along the second dimension, the second drive means mounted on the support table and engaging the tool carriage to drive the support table along the rail means, whereby the tool may be accurately positioned with respect to the work piece; and clamp means affixed to the support structure for engaging work piece for suspending the support structure