Established in 1952

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FOR IMMEDIATE RELEASE: This giant Ball Bar (Dumbbell) is a calibration artifact that is built very rigid to resist deflection induced by the force of the measuring probe. It is built in a modular design from tubular Invar and a series of bulkheads so the overall length can be varied from one meter (40 inches) to over four meters (16 feet), by substituting tubes of different lengths.

The Invar construction of this giant calibration device lowers the temperature sensitivity to one tenth that of steel and one twentieth of aluminum. The tubular construction yields a lightweight product that can be handled by a single technician.

This high precision physical artifact provides mechanical contact with the measuring probe tip that is required to properly evaluate a Coordinate Measuring Machine under actual operating conditions.

A Ball Bar (Dumbbell) is the ANSI specified artifact that will evaluate the entire geometry of a C.M.M. under actual operating conditions. It consists of two very round spheres of exactly the same diameter that are attached to the ends of a rather long rigid structure. The spheres used on the Giant Ball Bar (Dumbbell) are round and exactly the same diameter within less than five micro inches (.13 micrometers).

We supply a matched pair of large, one and one half-inch (38mm) diameter spheres as the standard; and even larger two-inch (51mm) diameter hollow spheres can be supplied on special order. These extra large two-inch diameter spheres make it even easier to probe from the long distances separating the operator from the test artifact on giant coordinate measuring machines.