Robb Hudson, CEO, Mitsui Seiki USA Inc.
Machine tool accuracy is not linear. It is volumetric. Traditionally, manufacturers have ensured accuracy of parts by calibrating just the linear motion of their machine tools. The problem: When making three-dimensional parts, knowing a machine’s one-dimensional accuracy ignores squareness, straightness, angular, and non-rigid body errors, which are the largest contributors to positioning inaccuracies. Part quality is at risk if a machining center cannot hold tolerances uniformly throughout its entire working envelope. This makes volumetric accuracy a key indicator of a machine’s capability in high precision applications. This presentation will detail the machine tool design and construction characteristics required to ensure optimum volumetric accuracy, and the instruments used to verify and measure volumetric accuracy.