Abstract
The double ballbar(DBB) is an instrument to measure roundness error of the machine tools. Traditionally, DBB is used in the vertical machine tool which has a vertical spindle, so the DBB can be easily installed to measure without additional jigs. But the condition in the horizontal machine tool is different. Because the horizontal machine tool has no vertical spindle, additional jigs are needed for the measurement. Not only the differences in the using DBB but also in the forming circular trajectory exist. Center of the circular trajectory in the vertical machine tool is stationary, but not in the horizontal machine tool. The trajectories of two balls of the DBB are not same in the two kinds of the machine tools. The method that the DBB measurement in the horizontal machine tool has the same effect comparing with the measurement in the vertical machine tool is presented.
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