TESA MH3D, User Manual

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©2004 TESA Switzerland All Rights Reserved.
Page 5-22
User's Manual
MH3D
Glossary
Tolerance Value An acceptable deviation from a specified dimension.
Touch Trigger A precise switching device (contact probe) that holds a
Probe (TTP) stylus. The stylus deflects slightly upon contact with a
surface causing a mechanical change in the probe that is
converted into a change of electrical voltage. Since the
system knows its location at that moment, the X,Y,Z
position of the probe is known.
Transformation Conversion of machine coordinates into part
coordinates.
Translate An alignment function used to move the part’s origin by
a specified amount in the X, Y, Z direction.
Translation The deliberate shifting of a datum to a predetermined
location through numerical input to the computer.
Travel The measuring range of a CMM.
Traverse Speed The speed of the tip of the ram of a CMM, measured
with respect to the part mounting surface, when the
machine is moved between nominal locations without
measuring.
True Position The exact location of a point line or plane with respect to
a datum or other feature.
True Position MMC Allows for an increase in positional tolerance as the size
of the feature changes.
True Position RFS Refers to the feature having a true position regardless of
a change in the size of that feature.
Unnamed Axis The axis not named in the machine’s active working
plane. For example, in the XY working plane, Z is the
unnamed axis.
U Value The value of the polar radius in the polar coordinate
system.
Variable Any value that is subject to change or revision.
Vector Referred to as I, J, K. It indicates the direction of a
feature’s centerline. In the case of a plane, the vector is
orthogonal to the measured surface, pointing in the
direction from which the plane was probed.
Vibration Amplitude Peak-to-peak amplitude of a given frequency
component.