How to Perform Shaft Alignment Using Dial Indicators

Shaft alignment is an essential task in rotating equipment maintenance. Misaligned shafts can cause premature bearing failure, vibration, and excessive wear, leading to equipment damage and downtime. Dial indicators are a common tool used for shaft alignment, and the following steps can guide you on how to perform shaft alignment using dial indicators:

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1. Prepare the Equipment: Before beginning shaft alignment, ensure that the equipment is secure and has been shut down safely. Remove any obstructions or guards that may hinder access to the shafts or coupling.
2. Mount Dial Indicators: Mount the dial indicators on each shaft's coupling as close to the shaft as possible. The dial indicator's tip should rest on the shaft or coupling's surface, and it should be positioned to detect movement in the horizontal and vertical planes.
3. Establish the Initial Reading: Set the dial indicators to zero or record the initial readings, which represent the initial position of the shafts. The readings can be taken in multiple locations, and the average reading can be used as a reference.

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1. Adjust the Alignment: Use shims or other adjustment devices to adjust the position of the equipment's base, ensuring that the shafts are correctly aligned. Record the new readings and make any necessary adjustments until the readings are within the recommended tolerances.
2. Check Angular Alignment: After achieving proper horizontal and vertical alignment, check the angular alignment of the shafts. Angular misalignment occurs when the shafts are not in the same plane, which can cause excessive wear and vibration. Correct any angular misalignment by adjusting the equipment's base or using a coupling alignment tool.
3. Record the Final Readings: Once you have completed the adjustments, record the final readings for future reference. This will also serve as a reference for future maintenance or troubleshooting activities.

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In conclusion, shaft alignment is crucial in rotating equipment maintenance, and dial indicators are a useful tool in achieving proper alignment. However, it is essential to follow the manufacturer's guidelines and consult with industry experts to ensure that the alignment is performed correctly and safely.