What Is Shaft Alignment?
Shaft alignment is the process of positioning two coupled shafts so their rotation centerlines are precisely collinear. Misalignment -- either angular (axes intersect at an angle) or parallel offset (axes are parallel but displaced) -- is the second leading cause of bearing failure after lubrication problems.
Methods
Straightedge/feeler gauge: Rough alignment. Dial indicators: Rim-and-face method, accurate to 0.02mm. Laser alignment: Fastest and most accurate method. See the Pillow Block Installation Guide for alignment procedures.
Frequently Asked Questions
Why is shaft alignment important for bearings?
Misalignment forces bearings to carry loads they weren't designed for: angular misalignment causes axial loads on radial bearings, and parallel offset creates cyclic load variations. Studies show that 50% of bearing failures are related to misalignment. Proper alignment can double or triple bearing life.