shaft, mechanical seal, bearings, pump shaft, motors, rotor, machine, vibration, alignment, radial alignment, coupling, shims, shaft coupling, equipment

How to align your shafts?

Home Registrar Newsletter Courses E-book References Shopping Seafaring About
Marine Links Glossary Skills Calculation Tools Ship

 shaft, mechanical seal, bearings, pump shaft, motors, rotor, machine, vibration, alignment, radial alignment, coupling, shims, shaft coupling, equipment

Engineering Articles

How to Align Your Shafts?

By: Thomas Yoon

In the last issue, we discuss about shaft seals and how liquid is prevented from coming out from the pump housing even though the shaft is rotating.

Some mechanical seals are made to very fine tolerances. Damage to mechanical seals and bearings can sometimes be cause by the misalignment of pump shaft with the motor shaft.

Whenever some of the motors or driven machinery is dismantled or even when the machines are not running smoothly, alignment has to be done.

The purpose of alignment is to ensure that the centerline of the motor rotor shaft coincides exactly with the centerline of the driven machinery. Alignment is essential to ensure that the machine runs smoothly with minimum vibration.

Provided the two shafts are not bent crooked, the two alignments to be checked and adjusted are: Offset alignment and Angular alignment.

Most alignments are rough alignment that can be done using straight edge ruler and feeler gages. However for precision alignment, the use of dial gauges with magnetic bases can be used.

Offset Alignment

The radial alignment is checked using a straight edge ruler. By placing the ruler across the coupling halves at the top, bottom and both sides any gaps between the 2 coupling halves will indicate that the shaft is offset slightly. The misalignment can be corrected by shifting the motor or by putting shims to raise up the motor or driven machine.

Angular alignment

By inserting a feeler gauge between the coupling faces and rotate both coupling halves simultaneously we can check whether the shafts have any angular displacement between them. The feeler gauge readings at checked at four points on the shaft coupling. Again the alignment is corrected by shimming or shifting the machinery.

The motor and the driven machine should be bolted solidly to the base after finalizing the alignment positions of the equipment.

For more information on alignment and the different tolerances

"Satisfaction Guaranteed Mind-Blowing Collection"
Looking for Quality Contractors? Experienced Responsible Companies that Produces Excellent Renovation for Homes and Offices.

Many years of working experience in Marine, Facilities, Construction has given the author material for writing e-books and articles related to engineering, and management. Subscribe to facworld ezine at

More information at and



  Training Job Leisure Skills Engrg Articles Places Links Ships  
Home Registrar Newsletter Courses E-book Articles References Shopping Seafaring About Us
Pleasure Sensations Advertise with Us E-book Design Web Design Survival Soviet Orient Travel Aids Seascape Cartoons
Marine Treasure Chest Navy Forex Trading Contact Us Link to Us Boating Safety Posters Story Telling Products
Search Flag Digital Fun 2002 - 2011 Thomas Yoon   Safety A-ware Offshore Surveys Search Colleges