Dial indicator shaft alignment procedure

Shaft alignment using a dial indicator is a crucial procedure to ensure the smooth operation and longevity of rotating machinery, such as pumps, motors, compressors, and turbines. Here is a step-by-step guide for performing shaft alignment using a dial indicator:

Training manual of shaft alignment

Tools Required:

- Dial indicator with magnetic base

- Straightedge or ruler

- Feeler gauges

- Spanner wrenches or alignment tools (if needed)

- Soft mallet or hammer (for adjustments)

Shaft alignment pdf document

Procedure:

1. Prepare the Equipment:

- Ensure that the machines to be aligned are clean and free from any obstructions.

- Mount the dial indicator on a stable magnetic base and position it securely on the machine frame or base.

2. Setup Dial Indicator:

- Attach the dial indicator’s magnetic base firmly onto one machine component (e.g., motor shaft) so that the indicator tip can reach the other component (e.g., pump shaft).

3. Establish Rough Alignment:

- Bring the two shafts roughly into alignment by adjusting the shims or base bolts. Use a straightedge or ruler to visually check the alignment. Ensure that the coupling faces are clean and free from any debris.

Handbook of laser shaft alignment

4. Position Dial Indicator:

- Position the dial indicator’s tip against a flat, clean surface on the first shaft (e.g., motor shaft). Set the dial indicator to zero at this position.

5. Measure Alignment:

- Rotate the shaft and observe the maximum and minimum readings on the dial indicator as it moves across the surface of the second shaft (e.g., pump shaft).

- Note the radial and axial misalignment values indicated by the dial indicator.

6. Make Adjustments:

- Based on the readings from the dial indicator, make necessary adjustments to correct misalignment.

- Use shims or adjust the machine base bolts to move the machinery into proper alignment. Adjust in small increments and re-check alignment frequently.

Shaft alignment handbook

7. Check Angular Alignment:

- Measure angular misalignment by positioning the dial indicator at 90 degrees to the initial measurement direction.

- Rotate the shaft and observe the readings. Adjust the machines to minimize angular misalignment.

8. Verify Final Alignment:

- After making adjustments, re-measure the alignment using the dial indicator.

- Continue adjusting until the misalignment values are within acceptable tolerances specified by the equipment manufacturer.

9. Tighten Fasteners:

- Once alignment is achieved, tighten all mounting bolts and fasteners to secure the machinery in place.

For more information follow Mechanical World

10. Final Checks:

- Conduct a final run-out check to ensure that the shafts are aligned both radially and angularly.

- Use feeler gauges to verify the coupling gap uniformity.

11. Document Alignment:

- Record the final alignment measurements and any adjustments made for future reference and maintenance.

Tips for Effective Shaft Alignment:

- Perform alignment when the equipment is at ambient temperature and under normal operating conditions.

- Use proper safety precautions, such as wearing appropriate PPE (Personal Protective Equipment) and ensuring the machinery is locked out and tagged out as per safety protocols.

- Follow the specific alignment procedures recommended by the equipment manufacturer for optimal performance and reliability.

By following these steps and guidelines, you can perform shaft alignment using a dial indicator effectively, ensuring the efficient operation and longevity of rotating machinery. Regular alignment checks and maintenance contribute to reduced downtime and increased equipment reliability.