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How to use individual radius blades?

Shop for Radius Gauges

2 types of radius blade

Step 1 – Select blade

Choose an individual radius blade. Either a blade with 5 measuring surfaces or a multi-function ring-bound blade.

Radius gauge and holder

Step 2 – If necessary, affix gauge holder

You may wish to affix a gauge holder (only for gauge with 5 measuring surface). This could help with placement against the object you are measuring.

Checking metal shoulder with a radius gauge

Step 3 – Identify structural curves

Identify whether machined parts have a structural curve which improves the strength of an object. This is known as a ‘shoulder’. Materials with a shoulder are often measured using radius blades so the level of added strength can be worked out from the internal radius.

When a square shoulder is machined in a place where a radius should have been, the possibility that the part will fail by bending or cracking is increased.
Ring bound radius blade measuring a shoulder on a workpiece A radius blade with 5 measuring surfaces or a multi-function ring-bound blade are best suited to measuring shoulders on work pieces because of their ease in maneuverability. A radius gauge set with multi-function blades could also be used.
Checking how the radius of an object compares to a precise radius gauge

Step 4 – Measure curve radius

The visual test method still applies. (See: ‘How to use a radius gauge set to inspect an existing object’). Set up a light source behind the object you are measuring. This allows you to see how close the blade can be positioned against the object.

Choose from several cut outs The radius blade has 5 measuring surfaces which all refer to one inscribed measurement. The multiple cut-outs are for convenience and allow the gauge to be manipulated easily so it can fit various positioned radii.