| 摘要 |
A coordinate measuring machine having three elongated members defining X, Y and Z axes is provided wherein the Y axis is defined by a horizontal arm extendedly and retractably mounted in a housing supported on the rail defining the Z axis. The horizontal arm is provided with convex ridges on its upper and lower surfaces. The ridges preferably extend along the center line of the arm. The arm is supported by upper and lower pairs of wheels having concave surfaces located in the housing.
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