A portable coordinate measurement machine comprises an articulated arm having jointed arm segments. The jointed arm segments include a rotatable shaft, at least two spaced bearings and a housing surrounding the bearings and shaft wherein races for the bearings are formed by at least one of the following: (1) the shaft constitutes the inner race of at least one of the two bearings and (2) the housing constitutes the outer race of at least one of the two bearings.