Aligning electromotors and couplings using a dial indicator (clock indicator) is crucial for ensuring efficient operation and reducing wear and tear on machinery. Here are some key points and steps involved in the process:

Importance of Proper Alignment

Reduces Wear and Tear: Proper alignment minimizes bearing and shaft failures,
reduces vibration, and lowers energy consumption1.
Extends Equipment Life: It helps in extending the life of the equipment between
planned
maintenance intervals1.
Types of Misalignment
Parallel Misalignment: The shaft centerlines are parallel but not in the same line.
Angular Misalignment: The shaft centerlines intersect at an angle.
Axial Misalignment: The shafts are misaligned along the axis, often due to thermal
​​​​​​​growth or thrust forces1.
Alignment Methods Using Dial Indicators

• Rim and Face Method:

                                                                       Rim Measurement: Measures parallel misalignment by placing the dial indicator on the rim of the coupling                                                                           hub.
                                                                       Face Measurement: Measures angular misalignment by placing the dial indicator on the face of the                                                                                     coupling hub1.




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• Reverse Dial Indicator Method:

Setup: Mount dial indicators on both shafts.
Measurement: Rotate the shafts and record readings at various positions (e.g., 12:00, 3:00, 6:00, and 9:00).
Calculation: Use the readings to calculate the necessary adjustments2.

Steps for Alignment Using Dial Indicators

• Initial Setup:

Ensure the machinery is off and locked out.
Mount the dial indicator on the shaft or coupling hub.

• Zeroing the Indicator:

Rotate the shaft to the 12:00 position and zero the dial indicator.

• Taking Measurements:

Rotate the shaft to the 6:00 position and record the reading.
Repeat for the 3:00 and 9:00 positions.

• Adjustments:

Based on the readings, adjust the position of the motor or coupling to correct misalignment.
Recheck the alignment after adjustments3.

Tools and Equipment
Dial Indicators: For precise measurement of misalignment.
Straight Edges and Feeler Gauges: For initial rough alignment.
Laser Alignment Tools: For more accurate and quicker alignment (optional).\

Source(s)
1. Coupling Alignment Fundamentals - Rexnord
2. Shaft and Coupling Alignment | Rockwell Automation | US
3. Rim and face - Alignment Knowledge​​​​​​​