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Chapter 1 Planning Your Measurements
Measurement Planning Guidelines
Note that the detection unit for the error correction table may be
different from the least programmable unit. If it is, you must enter a
correction factor in the Machine Units box on the Compensation Table
screen. Refer to the Agilent 5530 Getting Started Guide and the
Agilent 10747F Metrology Software's online help system for more
information on using this screen. Also, be aware that you may get
round-off errors if you try to check a diagonal and disregard the
resolution of the X-axis, Y-axis, or Z-axis.
•
Determine which format the Agilent 10747F Metrology Software
should use for its output. Examples are ISO, NMTBA, VDI, and BSI.
Note that the metrology software can easily switch between formats;
however, it is easier to compare calibrations if you choose one format
for all calibrations.
•
Plan for as many data points as time allows; the more data points you
collect the better.
The data points create a statistical and graphic illustration of machine
tool performance. More data points provide a more detailed report of
the machine tool's movement (including, for example, its sweet spot
and problem areas). Also, the accuracy of the statistical data increases
as you include more points.
However, there is a level at which the data can appear overwhelming
on the graph. Use the data analysis features of the metrology software
and your experience to determine how many points and runs to
include in your measurement. The industrial standard or
compensation scheme you use may provide additional requirements.
•
In determining the measurement interval, choose an interval that is
not a multiple of the pitch of the lead screw.
Measurements Reference Guide
1-3
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