©2004 TESA Switzerland All Rights Reserved.
Page 5-16
User's Manual
MH3D
Glossary
Perpendicularity The condition of a feature forming a 90 degree angle
with another feature one of which is a datum feature. An
alignment routine where the origin for the part’s coordi-
nate system is located at the intersection of the major
and minor axes.
Perpendicular An alignment routine where the origin for the part’s
Intersect coordinate system is located at the intersection of
perpendicular lines formed by the major and minor axes.
Pitch Vertical deviation from a level plane, as applied to the
travel of a CMM component along a given axis. The
angular motion of a carriage, designed for linear motion,
about an axis perpendicular to the motion direction and
perpendicular to the yaw axis.
Pixel The smallest element into which an image is divided,
such as the dots on a television screen.
Plane The surface of a part defined by at least three points. It is
always straight in two directions.
Plus Tolerance The positive amount that a measurement can deviate
from the nominal value.
Point A measurement routine consisting of one element
(CMM input) which yields an X, Y, Z location.
A point is the simplest geometric element.
Point Distance A measurement routine used to compute the straight line
distance between two X, Y, Z locations.
Point of Origin The zero point or datum point.
Polar Feature output expressed as a radius and an angle.
Polar Angle In a polar coordinate system, the angle between the polar
radius and the fixed reference line.
Polar Coordinates Points in space that are described in terms of radius and
angle (r, phi, z) in relation to some fixed origin. Another
type of coordinate system.
Polar Coordinate A method of locating a point by its distance from
System zero along a measurement line and by the angle between
the measurement line and a reference line.
Polar Radius The line that measures the distance from zero point to
the located point in polar coordinates.
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