User's Manual
MH3D
©2004 TESA Switzerland All Rights Reserved.
Page 5-7
Glossary
Cylindrical Expressing a point in space by its (r, phi, z) in relation to
Coordinates some fixed origin. The same as Polar Coordinates.
Cylindricity When all points of a cylinder surface are an equal
distance from a common axis.
Data Information that a computer understands and stores.
Database An area of computer storage holding the part programs.
Data Fit Coordinate points in space that are put together by a
computer to form geometric features such as planes,
circles, lines, spheres, etc.
Datum An origin or starting point for measurement, usually a
major feature or surface. A reference point, line or plane
to which the location or geometric characteristic of a
feature is related.
Datum Feature An actual, physical part feature on which a reference
point is established.
Datum Reference The perpendicular intersection of the primary, secondary
Frame and tertiary datum planes
Default The preset value that a computer will assign to a variable
if the operator does not enter a value.
Deviation The difference between the actual measured dimension
and the nominal dimension. Deviation is positive if the
actual dimension is larger than the nominal. Deviation is
negative if the actual dimension is smaller than the
nominal.
Device An auxiliary storage unit, such as a disk drive.
Diameter of a The maximum diameter of a rotary table supplied with a
Rotary Axis measuring machine. This is the maximum diamter on
which a part can be fixtured.
Direction Cosine One of three trignometric directional values (I, J and K)
used to identify a feature’s orientation in space.
Directory A storage area for programs located in the database.
Disk A storage device used to store part programs and other
data collected by the computer.
Disk Drive A device used to read and write information from the
computer to a disk.
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