enveloping circle gauge for roller bearing

The MG121 enveloping circle gauge by Schaeffler Germany provides high accuracy in calculating enveloping circle interiors, as well as cage assembly. This is achieved by the device's two dedicated hardened and accurate ground surfaces wherein one is conveyable. Before any calibration or calculation can be done, the the gauge must first be positioned to the interior enveloping circle. The enveloping circle calculation is utilized to calibrate narrow bore bearing positions. These said bearings are then directed to the designated position. However, in situations wherein bearings feature a cylindrical bore, unique pre-ground internal rings are utilized to accomplish the required results, pertaining to the necessary bearing diameters.