19
IMPORTANT REMARKS
FOR A PROPER MEASUREMENT
The Archimede instrument measures the circumference diameter fitted through three
points of contact identified by the instrument supports (the central one and the two
wheels at the ends of the arms). Should be taken in mind that, in case of shape error of
the object to be measured, will be obtained measurements influenced by the same error.
Shape error examples:
Ideal circumference
The solution to have a valid measurement is to use the “average” function, provided by
the instrument; thus measuring the object at several arcs in order to obtain the averaged
value of the diameters measured.
To perform a correct measurement it’s very important the way how the instrument is
used. The two arms in titanium are the most stiff solution that can be achieved: although
the load generated by the operator onto the Archimede arms while measuring, produces
a minimum deflection, that may result in a variation on the angular measurement.
To avoid and limit this influence, it is strongly recommended to hold the instrument
without pressing the arms against the object to be measured
(pressure max. of the
operator 1 ÷ 2 kg) using when possible the mechanical stops.
The measured diameter
will be
lower
then the ideal
circumference.
The measured Diameter will
be
bigger
then the ideal
circumference.
