Which instrument would you use to verify a corner radius on a machined part?

Which instrument would you use to verify a corner radius on a machined part?

• A. Radius gauge
• B. Caliper
• C. Micrometer
• D. Height gauge

Answer: (A)

To verify a corner radius, you need a tool that directly checks curved profiles. A radius gauge provides a set of arcs that match common radii, so you can test the part’s corner by fitting the appropriate arc into it. The go/no-go check with the gauge confirms the radius is correct within tolerance: if the chosen arc sits flush, the radius matches; if it doesn’t, you know the radius is off. Other tools are designed for straight dimensions or height, not curvature. A caliper measures linear distances and can’t reliably verify a curved corner. A micrometer is for precise thickness or diameter of small features, not the radius. A height gauge checks vertical height or depth, not the arc of a corner. So the radius gauge is the best choice for checking a corner radius.

To verify a corner radius, you need a tool that directly checks curved profiles. A radius gauge provides a set of arcs that match common radii, so you can test the part’s corner by fitting the appropriate arc into it. The go/no-go check with the gauge confirms the radius is correct within tolerance: if the chosen arc sits flush, the radius matches; if it doesn’t, you know the radius is off.

Other tools are designed for straight dimensions or height, not curvature. A caliper measures linear distances and can’t reliably verify a curved corner. A micrometer is for precise thickness or diameter of small features, not the radius. A height gauge checks vertical height or depth, not the arc of a corner. So the radius gauge is the best choice for checking a corner radius.