Glossary of terms used on this site

There are 38 entries in this glossary.
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Term Definition
ARC SECOND

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

AXIAL

Located on, around, or moving along an axis.

AXIS OF ROTATION

A straight line about which a body or geometric object rotates. The axis of rotation of a spindle is the line around which the chuck or tool holder rotates.

BCE - BORE CENTER ERROR

A measure of the offset of a bore's center from a reference bore's center.

BUCK-IN

Adjusting a laser plane or line to be parallel to the surface being measured (a table top, a surface plate, or a way surface). Three points are required to buck-in a laser plane to a reference surface. Two points are needed to buck-in a straight-line laser to a reference line (i.e., centerline).

bucked in

Adjusting a laser plane or line to be parallel to the surface being measured (a table top, a surface plate, or a way surface). Three points are required to buck-in a laser plane to a reference surface. Two points are needed to buck-in a straight-line laser to a reference line (i.e., centerline).

bucked-in

See Buck-In.

BUCKING-IN

See Buck-In.

BUTTOCK LINE

An aerospace term used to describe a reference line that runs along the length or the longitudinal axis of the aircraft. An aircraft contains several buttock-line sections.

CATENARY SAG

The curve theoretically formed by a perfectly flexible, uniformly dense cable that is not capable of being stretched and is suspended from its endpoints. It is a measure of how much the elevation of a cable drops between its 2 endpoints.

COLINEAR

Lying on or passing through a single straight line.

CONCENTRIC

Having a common center.

CONTINUOUSLY ROTATING LASER PLANES

Laser planes that are generated by an automatically rotating spindle containing a pentaprism.

DATUM

A reference used as a basis for calculating or measuring.

FLASHING

A quality problem in plastic parts that occurs when the molds do not meet exactly parallel, which cause excess plastic to build up on the part.

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