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Examining the Trace
You can test the roundness of the traced
components against any (or all) of the
reference standards.
The software will
calculate the centre of the trace according to
the standard chosen and redraw the trace on
the new centre. This causes any undulations
or irregularities to appear slightly differently
but angles and amplitudes are maintained. If
you wish to review the trace as it was taken
then you can select Raw Data. In this case
no results will be shown.
You can choose to show or not show the Reference Circle and/or Peak & Valley
Circles. The system will remember the chosen setting after the software is closed down.
The View menu also provides the facility for showing or not showing the Toolbar
(which contains the icon buttons), the Status Bar (which is at the bottom of the screen)
and the Digital Meter which only appears within the Setup dialog underneath the
deviation pointer.
Other items in the View menu will be discussed later.
Examining the Results
The results box is displayed whenever the trace is tested against one of the reference
standards.
O
The
symbol represents roundness and is the calculated as the
deviation between peak and valley for the measured trace.
E
The
symbol represents eccentricity and is the displacement
between the centre of the reference circle and the datum axis
[which is the spindle unless another datum reference has been
E
chosen (see later)]. The
symbol will be replaced by two
concentric circles representing concentricity if that option has
been chosen (see Initial setup).
The angle symbol represents the value of the angle of a line
drawn from Datum to the centre of the reference figure (often
referred to as "the angle of eccentricity").
The arrow symbol represents the run-out which is the total
deviation of the gauge as measured from the datum axis. This is
independent of the reference standard chosen and will be
affected by the accuracy of the component centring as well as
the shape or roundness error of the component.
The roundness error at any point on the component can
be selected and displayed by moving the mouse pointer
to a point of interest and clicking the mouse.
Alternatively, you can use the left and right cursor keys
to move the pointer around the trace. The system takes
1024 measurements around the trace and the pointer will
move to the next measurement sample with each
depression of the key.
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