Abstract: A vision inspection system capable of high resolution of distanced portions of the same part is provided, allowing for dimensional calculations to be made on large parts with high resolution. A process for inspection of a part is provided, comprising the steps of: mapping a first portion of the part; mapping a second portion of the part; defining a first reference coordinate corresponding to a first reference point located on the first portion of the part; defining a second reference coordinate corresponding to a second reference point located on the second portion of the part; determining the number of coordinates between the first reference coordinate and the second reference coordinate; calculating a constant corresponding to a third portion of the part, wherein the third portion of the part is not mapped; and adding the constant to the number of coordinates between the first and the second reference coordinates.

Abstract: A power tong system for engaging or disengaging threaded pipe sections has an annular rotary member that is supported against lateral thrust and include a hinged portion that is pivotable to permit side access to a pipe. The rotary member is rotated about its central axis by a peripheral drive chain engaging the rotary member through a relatively small wrap angle. The free end of the hinged portion and the opposing end of the principal body of the rotary interlock and become more secure in self-centering fashion under the spreading forces that are exerted during operation. Structurally rigid head plates on opposite sides of the rotary member are slidable relative to the housing, and incorporate spaced apart radial bearing slots that guide oppositely disposed heads that engage the pipe with hardened die elements. Twisting moments on the heads are absorbed in the head plates, such that the heads are subjected only to uniform and symmetrical forces.

Abstract: A power tong system for engaging or disengaging threaded pipe sections has an annular rotary member that is supported against lateral thrust and include a hinged portion that is pivotable to permit side access to a pipe. The rotary member is rotated about its central axis by a peripheral drive chain engaging the rotary member through a relatively small wrap angle. The free end of the hinged portion and the opposing end of the principal body of the rotary interlock and become more secure in self-centering fashion under the spreading forces that are exerted during operation. An interlock and latching system insure against erroneous sequencing and operation without full closure of the hinged mechanisms. Structurally rigid head plates on opposite sides of the rotary member are slidable relative to the housing, and incorporate spaced apart radial bearing slots that guide oppositely disposed heads that engage the pipe with hardened die elements.