Abstract: A machine for repetitive cutting of small identical parts from a relatively large metal plate. A scanning head is positioned on a carriage above a template which is mounted to a tracing table, and one or more metal cutting heads are also mounted on the carriage. The scanning head is operable to drive the carriage and cutting head to cut a first series of one or more identically shaped parts from the plate. A further carriage on the machine is movable between a stop and an adjustable limit switch, with the adjusted distance between the stop and switch corresponding to the pre-determined distance it is desired to shift the tracing table to position the template for controlling the cutting of a second series of one or more identical parts from the same plate. The further carriage is selectively connected to a table moving mechanism, and such connection also actuates the latter to move the table until the carriage engages the limit switch.

Abstract: A flat metal plate is first formed into a suitable segment of a large generally spherical body. It is then properly positioned on a horizontal cradle and its edges cut vertically as if from infinity, i.e. so that they are all parallel. A cutter then traverses the pre-cut edge to form the proper contour for welding. The pre-cut edge itself forms an accurate fixed reference and cooperates with guides on the face of the curved plate to keep the axis of the milling cutter tool substantially perpendicular to the surface of the plate at the point of milling contact. When all segments are so made and then joined, the resultant generally spherical body will be within substantially closer tolerances.