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Chapter 11 Diagonal Measurements
Background — Why Diagonal Measurements?
Background — Why Diagonal Measurements?
The goal in calibrating a machine tool or coordinate measuring machine
(CMM) is to determine its volumetric accuracy — that is, its ability to
position accurately anywhere in the work zone. This cannot be done
directly, but can be inferred by measuring the six degrees of freedom for
each axis and the squareness of X, Y, and Z to each other. This can be a
time-consuming process, and in many cases the time spent is not justified.
Thus, there is a need for a quick assessment of volumetric performance.
Measurement of work zone diagonals provides just such an assessment.
As the spindle is traversed along a body diagonal of the work zone, all axes
must move in concert in order to position accurately along the line.
Diagonal measurements are useful in machine tool acceptance testing or
in a periodic maintenance program to quickly assess the condition of a
machine.
Agilent 10768A Diagonal Measurement Kit
The Agilent 10768A Diagonal Measurement Kit, shown in
Figure 11-2A/B, is an optical accessory to the Agilent 5530 Dynamic
Calibrator. It enables precise alignment of the laser beam to the body
diagonals of the work zone of a milling machine or CMM. It also simplifies
calibration of slant-bed lathes. The optics can be repeatedly aligned to the
same machine diagonals at future calibrations. The Agilent 10768A
enables implementation of ANSI/ASME standards B89 and B.5 for CMMs
and machine tools, respectively.
The Agilent 10768A Diagonal Measurement Kit provides hardware that
allows you to use Agilent Technologies linear measurement optics (see
Figure 11-3) in an Agilent 5530 Dynamic Calibrator to make distance
measurements along any linear machine travel path.
11-4
Measurements Reference Guide
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