Accurately ground sleeves, or guide bushings, engage guide pillars for aligning the top plate with the bottom plate. Most bushings are made of tool steel although they are also available in bronze. Pillars and bushings are assembled by shrink fitting into holes bored in the top plate and the bottom plate. The pillars and bushings are subjected to deep freezing, thereby reducing there diameter. They are then inserted in the top plate and bottom plate and upon warming to room temperature, they expand to provide a tight fit between components.
Each guide bushing is provided with a fitting for lubrication.
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