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Initial Setup
The Options Menu allows the user to
select the most suitable settings for
the
application.
The
previous
settings will be recalled when the
system is started-up.
The measurement units can be either
Metric [millimetre (mm) or micro-
metre (um)] or Imperial [inches (ins.)
or
micro-inches
(μins.)]
The
roundness chart will be shown in red
when the metric option is chosen and
in blue for the imperial option.
Normal Tracing is the usual choice
when tracing on the exterior of a
component. Inverse Tracing causes
the direction of deflection to be
reversed and is commonly used when
tracing the interior of a component.
By using a mechanical adaptor, the roundness mechanics can
usually be used to measure component Flatness and Squareness.
Changing the user selection allows the results to be displayed in the
correct format. The results are not meaningful unless a radius of
measurement is specified. This is entered by selecting Radius
from the Options menu.
The relationship between Concentricity and Eccentricity is simply
that Concentricity is twice Eccentricity. Selection between these two items allows the
user to choose whichever term is more suitable for the application.
The 'direction of rotation' refers to the direction that the trace is drawn on the chart and
it will be chosen to suit the mechanics. Note: for the type of mechanics with a fixed
stylus and a rotating component then the direction of rotation of the trace is the reverse
of the direction of rotation of the component.
When the Shape Compensation option is enabled, the system will apply a
mathematical correction to the tracing to correct for shape errors introduced by the
component being off-centre. A nominally round but substantially off-centre component
will appear to be kidney shaped (this shape is called a limaçon). After the Least
Squares centre of the limaçon is found, the system can correct the shape, as it appears
on the screen, to restore circularity. If you find that this option is not suitable for your
application, you can switch it off.
The Customised Stylus Length option allows the user to use a non-standard length of
stylus. When a length is entered, it will be retained by the system until it is changed by
the user.
Other items on this menu will be discussed later.
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