Manual for High Voltage Process Performance Motors
Installation and Alignment - 27
3BFP 000 063 R0101 REV D
3.6.5.2 Run-out of the coupling halves
The alignment procedure is started by measuring the run-out of the coupling halves. This
measurement will show any inaccuracy of the shaft and/ or coupling halves.
The run-out of the coupling half in respect to the bearing housing of the machine is measured.
Place the gauges according to Figure 3-6 Measuring the run-out at the coupling half. Similarly
check the run-out of the coupling half of the driven machine in respect to its bearing housing.
A simple lever arm is needed to turn a rotor of a sleeve-bearing machine.
The admissible run-out error is less than 0.02 mm (0.8 mil).
Figure 3-6 Measuring the run-out at the coupling half
3.6.5.3 Parallel, angular and axial alignment
After the machine has been roughly positioned, as described in Chapter 3.6.2 Rough levelling
and Chapter 3.6.3 Rough adjustment, the final alignment can start. This step must be performed
with great caution. Failure to do so can result in serious vibrations and damage to both driving
and driven machine.
The alignment is done in accordance with the recommendations given by the coupling
manufacturer. Parallel, angular and axial alignment of the machine is required. Some standard
publications give recommendations for coupling alignment, e.g. BS 3170:1972 "Flexible
couplings for power transmission".
In accordance with common practice, parallel and angular misalignment should not exceed
0.05-0.10 mm and axial misalignment should not exceed 0.10 mm, see Figure 3-7 Definition of
misalignment The corresponding run-out is 0.10-0.20 mm for parallel and angular
misalignment.
