Measurement points are recorded at three fixed clock positions: 9, 12, and 3 o’clock. This is the classic three-point method which can be used in most cases. Below are some applications where this mode is preferred:
- When performing an alignment on a vertical machine the automatic inclinometer used to determine the shaft’s rotational angle no longer works, because it is gravity operated. Therefore, use the 9-12-3 method so that you can manually set the angles or in this case clock positions.
Horizontal machines which are installed at an angle due to specific industry or plant requirements. See examples below:
- Where the machine are at an angle axially and the sensor can’t determine true zero position. See Figure 1 below:
- Where the machines are installed at a rotational angle and the sensor true zero position does not coincide with the actual zero position. See Figure 2 below:
Download our 5-Step Shaft Alignment Procedure for a simple and effective procedure for shaft alignment of rotating equipment!
Alignment by Carlos Bienes CRL