Shaft Alignment Basics: Controlling Backlash

Backlash is unintended movement that occurs when rotating shafts during an alignment. It is most often caused by looseness in the coupling. On misaligned machines, backlash can cause measurement errors. This 1-minute, 43-second video explains the two guidelines that have been established for controlling backlash and the techniques that should be followed even when there are no obvious signs of backlash.