Many object have edges with an imperfect radius. Imperfections are often unknown ntil checked correctly with a radius gauge.
Step 1 – Select gauge
To check a machined surface, such as an inner bearing (pictured), use any gauge with a concave measuring capability. The gauge shown has a 2mm radius (5/64 inch).
Step 2 – Assess surface radius
Move the gauge along the curvature of the surface, making sure it remains in contact with no visual gap in between. Look out for any loss of contact between the surfaces, or any irregular movement of the gauge around the radius.
Step 3 – If necessary, correct radius
Loss of surface contact or interrupted gauge movement is an indication that the radius may require grinding or polishing, to match the required shape. Radii on bearings are often required to meet specifications that allow for safe operating procedure.