AC Motor Laser Shaft Alignment

When rotating machinery are used in an industry, a Laser shaft alignment is the best way to ensure that the perfect rotation is maintained. A proper laser shaft alignment is done when the centre lines of the rotation machinery shafts are in line with each other. When the machinery is properly aligned, it works more efficiently.

A laser shaft alignment measurement is done by the machine operator. When a machine is aligned appropriately, it makes the machinery to not only work well but also last longer. The shaft alignment should undergo inspections, especially when producing vital products, at least once in a year. This inspection is recommended by the U.S. Department of Energy’s Industrial Technologies Program (ITP). Misalignment will definitely lead to damages.


In the alignment of large electric motors, the couplings are aligned directly and rigidly. . The ITP recommends that parallel offset alignment tolerances not exceed 2 mils at 1200 rpm, to 0.75 mils at 3600 rpm. With excessive misalignment, even flexible couplings can contribute to premature bearing, seal, or coupling failures. The Industrial Technologies Program recommends this balance alignment of the coupling of the motor. If the machinery is misaligned, other damages may also emerge such as loosening of the foundation bolts and coupling bolts but if the technician is qualified he can quickly detect such problems on time.

Proper Laser shaft alignment prevents angular misalignment, when the electric motor drive shaft is set at an angle to the driven machine. Therefore ensure that you employ a qualified technician for the job. This is  because it is the responsibility of the technician to find out if the equipment is properly aligned. As the shaft is running in speed it heats up and expands, so proper monitoring should be in place to ensure the machine is running as expected

Laser Shaft alignment ensures the right coupling of the machine and as such prevents further damage. It also ensures the machine work more effectively hence laser alignment is a basic requirement to avoid malfunctioning. This procedure is very reliable because it has been modified and it is cheap to carry out.

There are two type of misalignment namely;

  1. Angular misalignment – in this category of misalignment, the shafts line are at a vertical or horizontal whether on the same plane or on a different plane.
  2. Parallel misalignment – unlike the angular misalignment, this type of misalignment is when the lines of shafts are parallel but separated vertically or horizontally.