Abstract: The present invention crimping machine has mounted to each end of a C-shaped frame a sub-frame to which is fixedly coupled one half of a master die. The two halves of the master die are positioned opposed to each other so that when they come together, a concentric aperture is formed. Each half of the master die is made up of a number of master die segments. To some of these segments there are removably attached a corresponding crimp die segment. Thus, one set of crimp dies is positioned opposed to another set of crimp dies. When in an opened position, the opposed sets of the crimp dies are separated by a channel which distance can be selectively controlled. When moved to the closed position, the crimp die segments each would exert the same force against the workpiece to thereby effect an even pressing of the workpiece, be it a crimping, forming or some other pressing operation.