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How does a radius gauge work?

Shop for Radius Gauges

Radius Gauge A radius gauge works as a concave and convex referencing device.

It is used to clarify how close the radius in question (on a workpiece) compares to the precisely machined radii on the gauge.

Light source A light source should be placed behind the object being measured to help identify any gaps between the surfaces.
Radius gauge blade placed against radius The precisely machined radius of the gauge is pressed closely against an object with either a concave or convex radius.

The two distinct measuring processes are described below.

Testing a concave radius

Testing a concave radius A radius gauge can be used to test the size of a concave radius on an existing object.
Using the convex side of the radius gauge Here the external convex radius of the gauge is used to identify the internal concave radius of sheet metal.

Testing a convex radius

Testing a convex radius A radius gauge can be used to test the size of a convex radius on an existing object.
Using the concave side of a radius gauge to measure Here the internal concave radius of the gauge is used to identify the external convex radius of a hinge.

Both measurements correspond to the same measurement as stated on the tool.