Glossary of terms used on this site

There are 38 entries in this glossary.
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Term Definition
FLATNESS

The state of having a smooth, even, level horizontal surface without slope, tilt, or curvature.

He-Ne LASER

Helium Neon laser usually used in interferometry. Usually requires 1 hour warm up and is not as spatially stable as diode lasers.

INTERFEROMETER

An instrument that measures changes in the linear position of an machine's axis. This is accomplished by counting or displaying interference fringes created by a light source of known wavelength.

LEVEL

Having a flat, smooth surface as characterized by using gravity as a reference. Being on a horizontal plane.

LIVE/DYNAMIC DATA

Target readings displayed on a computer or readout that update automatically as adjustments are made to the point on a machine that is being measured and aligned. This allows the user to watch the machine move into alignment.

NORMIN

The NORMIN method was developed by Hamar Laser to compensate for laser and/or target mounting errors in bore or spindle work. The word is a contraction of "NORMal and INverted".

To qualify a laser, the NORMIN procedure is used to make the laser parallel to an axis of rotation in spindle applications or to calculate laser centering errors in bore applications. For spindle applications, it works like this: a laser or fixture holding the laser is placed in a spindle in the normal position (12 o'clock). The laser is turned on and the readings are recorded. Next, the laser is rotated 180

NORMIN Method

The NORMIN method was developed by Hamar Laser to compensate for laser and/or target mounting errors in bore or spindle work. The word is a contraction of "NORMal and INverted".

To qualify a laser, the NORMIN procedure is used to make the laser parallel to an axis of rotation in spindle applications or to calculate laser centering errors in bore applications. For spindle applications, it works like this: a laser or fixture holding the laser is placed in a spindle in the normal position (12 o'clock). The laser is turned on and the readings are recorded. Next, the laser is rotated 180

OFFSET CENTERLINE

Usually used in roll alignment applications. An offset centerline is a line established to the side of a process mill that is parallel to the machine's centerline. It is used as a reference to measure roll parallelism.

ONE ARC SECOND

A measure of angle equal to 1/3600th of a degree or 0.00006"/ft (0.005 mm/M).

OPTICS

Theodolites, transits, optical borescopes or any other measuring instrument using optical instruments to measure levelness and straightness.

PARALLELISM

2 or more lines or planes, extending in the same direction and everywhere equidistant from each other. Planes and lines are said to be parallel to each other if they never meet when projected out into infinity.

PDA Display

Used as a target readout in the R-1355-2.4ZB

PENTAPRISM

A 5-sided prism that accepts a laser beam in one side and projects it at a precise 90

POINT-AND-SHOOT LASERS

A type of laser alignment system that do NOT automatically rotate. To take measurements the user has to precisely move the laser beam to a target location.

PSD -POSITION SENSING DETECTOR

A piece of silicon that detects the center of energy of the laser beam.

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