Many machines support a shaft at two bearing positions. The arrangement normally needs controlled axial location at one position and freedom for thermal movement at the other.
Locating or fixed position
The locating position controls axial movement of the shaft in both directions. In a split housing, suitable locating rings or the selected bearing arrangement may establish this position.
Non-locating or floating position
The non-locating position allows axial displacement caused by shaft expansion and manufacturing tolerances. The movement must occur in the intended part of the arrangement.
Why the distinction matters
Incorrectly restraining both positions can impose unintended axial load as the shaft heats. Leaving both positions uncontrolled can allow excessive axial movement.
Information needed
Identify the shaft layout, bearing designations, distance between bearing positions, operating temperature and intended locating side.
If the existing arrangement is uncertain, send an assembly drawing or photographs from both bearing positions for engineering review.