User's Manual
MH3D
©2004 TESA Switzerland All Rights Reserved.
Page 5-17
Glossary
Positional Accuracy Deviation in readings between the CMM’s display and
those of a laser interferometer, usually taken at 1"
intervals over the length of a single axis. Not a measure
of machine accuracy, it indicates the linearity of the
scales.
Position Velocity The speed of the probe between measurements.
Post Hit Multiplier Same as multiplier. A value that pushes the target point
deeper into the part.
Prehit Distance The distance of the probe from the part when it changes
from position velocity to contact velocity. Also called
the Probe Approach Distance.
Primary Datum The datum established with at least three points of
contact between the most important functional surface
and the inspection surface.
Probe On a CMM the component that touches and measures
the part.
Probe Approach The distance to the part at which the machine traverse
Distance speed is reduced to the probe approach rate for measure-
ment.
Probe Body The cylindrical part of a probe into which the stylus is
mounted.
Probe Diameter The diameter of the probe tip whose value (radius) is
used to compensate for measurements.
Probe Head The mounting portion of a probe that attaches to the
Z Rail of the machine. The probe body is attached to the
probe head.
Probe Hysteresis The hysteresis of the mechanical or electrical elements
of a probe.
Probe Sense The inner or outer (+/-) consideration of the probe when
measuring.
Probe Tip The part of the probe that actually makes contact with
the part.
Profile A cross-section of a part, projected into some reference
plane.
Program Listing A line-by-line list on the computer screen or on a
printout showing the steps in a part program.
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