English to Portuguese Tech/Engineering Engineering: Industrial Perfuração Mineração

The reason this method is ideal is that coupling surface runout does not affect the accuracy of shaft alignment.
In other words, it is possible by this method to accurately align shafts in spite of coupling surfaces that are not running true to each other.
However, in some cases, the above method is not possible.

RUNNING TRUE??

In such cases, it becomes necessary to use the method of attaching the dial indicator to one shaft or coupling half while contacting the second hub or shaft while one shaft is rotating.