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Pins project from the tools to centralize the workpiece bore in relation to the electrodes.

It is essential that the spindle is centralized (or centred) while adjusting the alignment.

The centralizer serves to align the gauge within the bore.

The frame of the sight is aligned with the fore and aft axis of the airplane.

Источник: Русско-английский научно-технический словарь на Gufo.me