©2004 TESA Switzerland All Rights Reserved.
Page 5-4
User's Manual
MH3D
Glossary
Approach Vector The vector that the measurement software takes to
calculate a pre-measurement position and approach the
surface point on the part.
Array An allocation of memory to be used in a program.
Axial Length The deviation from the known length of a standard
Accuracy placed parallel to the axis measured. Includes probe
error.
Axis A reference line from which distances or angles are
measured in a coordinate system.
Axis Direction The direction of any line parallel to the motion direction
of a linear moving component.
Axis Feature The centerline of a cone, cylinder or step cylinder.
B89.1.12 The American Standard (ANSI/ASME) for determining
Coordinate Measuring Machine accuracy and
performance.
Backoff Distance The distance the probe backs off the part after a touch.
Backup Copy A duplicate of a part program.
Ball Bar A three-dimensional gage consisting of two precision
balls of the same diameter, separated by a bar and used
for determining volumetric accuracy. The bar must be
sufficiently rigid that its length is constant during a set of
measurements.
Ball Bar (Socketed) A ball bar held by a socket which allows repeatable
relocation at one or both ends.
Ball Probe A type of rigid probe used for measuring curves, lines
and holes.
Bandwidth The total bidirectional deviation from a nominal value
(Maximum-Minimum range).
Best-Fit Feature A feature constructed through the measurement points
that most approximate a perfect feature.
Bilateral Tolerancing A tolerancing method where the feature dimension is
allowed to vary in both the positive and negative direc-
tions from the nominal.
Bolt Circle A measurement routine which constructs a circle
through previously measured circle center points.
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