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Alignment Procedure Introduction

Horizontal Move

Vertical Move

Thermal Movement

Alignment Tolerances

Soft Foot Check

Sag Check


Alignment Tolerances

       An alignment tolerance allows the alignment to be within an acceptable range of misalignment that does not affect the machine's ability to rotate properly. 

        Misalignment is the deviation of relative shaft position from a collinear axis of rotation, measured at the points of power transmission, when the equipment is running at normal operating conditions.

        A good rule of thumb for general purpose equipment (3600 rpms and less) is .0005" (1/2 thousandth) per inch of coupling span.

tolerance graph.JPG (125195 bytes)

        This tolerance uses only speed and coupling span.  Other factors to consider are: How critical is the equipment, mechanical stiffness, the excitation forces influencing the rotor dynamics, etc.  This is where knowing your equipment is essential.

 

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