top of page

Thermal Movement

When machinery is operating the moving parts cause friction that in turn creates heat buildup causing the machinery to expand.  This expansion in the machinery is called Thermal Growth.   The amount of movement can be predicted when you know the machinery's material, temperature change, and the distance between shims and shaft centerline.

Calculating Thermal Movement

thermal_movement.jpeg

Graphing Thermal Movement
Most machinery must be misaligned cold so that the shafts will be collinear during normal operating conditions.  Graphing the move above shows us that the pump does not move (no change in temperature) and the motor rises an estimated .004" (3.53 mils)

therma1.jpeg

Pump stays the same 
Motor rises .004" at both feet

bottom of page