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An internal radii will return a value for which compensation must be made.
gap
1.7 Measuring an External Radius with K-METRON.
It is straight forward to measure external radii down to 5mm. Place the sensor head on the
surface of the part located at external radius to be measured. Ensure that the sensor head is
perpendicular to the tangent of the radius to make an accurate reading.
1.8 Measuring an Internal Radius with K-METRON.
It is straight forward to measure external radius down to 5mm. At radii less than this the
main difficulty is with access to the surface. When measuring thickness of internal radii, the
correct measurement often requires compensation for the gap distance as shown below.
5 |
P a g e
K-METRON Radio User Instructions (Firmware 2.3.4; Doc v3.0.0)
Thickness displayed on the meter
will be the thickness of the
measured part plus the gap
between the sensor head and the
part.
minimum external
radius
minimum external
radius
gap
A minimum external radius of 5mm
(3/16") can be measured using the
supplied 10mm diameter magnetic
sphere.
A minimum external radius of 3.3mm
(0.1229") can be measured using a 6.6mm
diameter magnetic sphere (contact for
supply).
A minimum internal radius of
25mm (1") can be measured before
it becomes impractical and difficult
to compensate for gap distances.
Radii less than 25mm also tend to
allow the magnetic force to pull
the magnet to the side of the part.
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