Enveloping circle gauges, can be used to set the radial internal clearance or preload of cylindrical roller bearings.
Bearings with separable inner rings
The enveloping circle gauge MGI21 is used to measure, by means of two hardened and precision ground surfaces, the internal enveloping circle of a roller and cage assembly. One measurement surface is movable.
Before measurement, the gauge is set to the internal enveloping circle of the roller and cage assembly. This setting operation requires a snap gauge such as SNAP-GAUGE.
After mounting of the outer ring together with the roller and cage assembly, the enveloping circle diameter is then determined using the gauge MGI in a comparative measurement.
In the case of a bearing with a tapered bore, the enveloping circle measurement is used to calculate its position on the tapered seat of the shaft. During mounting, the bearing is driven to this position. This results in the internal clearance or the preload.
In the case of bearings with a cylindrical bore, preground inner rings (suffix F12) are used and finish ground to the required bearing diameter.
Bearings with separable outer rings
The enveloping circle gauge MGA31 is used to measure by means of two hardened and precision ground surfaces, the external enveloping circle of the roller and cage assembly.
The gauge is set to the raceway diameter of the mounted outer ring. This dimension is determined using conventional internal gauge.
The tapered shaft with the premounted inner ring and roller and cage assembly is then inserted in the gauge. The shaft is driven axially by the hydraulic method until the required radial internal clearance or preload is achieved.