Abstract: A fabrication assembly (10, 18, 24, 30, 38, 44, etc.) for the manufacture of prosthetic and orthotic devices allows various components of these devices to be aligned on a common mast with respect to height, distance, flexion/extension, abduction/adduction and rotation alignment criteria, and each of these criteria can be adjusted apart from the other criteria. There are planar translation components (62, 62') that permit true planar, medial-lateral movement relative to a mast (10) without imposing rotation or angular deflection to a component mounted thereon. Accordingly, the assembly of a prosthetic or orthotic device according to physiological alignment criteria is an efficient step-by-step process, whereas prior art devices required that at least two criteria be adjusted and checked simultaneously. Among the features of the fabricating system are an angular/rotational fixture (38) that allows for separate settings of angular and rotational orientations for a given component.