GB 30 and GB 10 internal clearance gauges
SKF internal clearance gauges in the GB 30 and GB 10 series are designed for use with double row cylindrical roller bearings ranging from NN 3006 K to NN 3068 K (GB 30 gauges, → product table) and for use with single row cylindrical roller bearings ranging from N 1010 K to NN 1020 K (GB 10 gauges, → product table). In general, gauges in the GB 30 series can also be used for single row bearings in the N 10 K series. GB 30 and GB 10 internal clearance gauges are able to accurately measure the outside envelope diameter of the roller set when the rollers are in contact with the inner ring raceway.
Depending on their size, GB 30 and GB 10 internal clearance gauges consist of either a two piece or a slotted gauge body that holds two diametrically opposed ground gauging zones (fig.1). The gauge body can be expanded by means of an adjustment screw. This enables the gauge to be pushed over the inner ring with roller and cage assembly, without damaging the rollers or the gauging zones. The gauging zone that is connected to one half of the gauge body transmits the diameter measured by both gauging zones to a dial indicator.
The typical gauging procedure:
- Set a bore gauge to the raceway diameter of the mounted outer ring and zero the dial indicator.
- Place the bore gauge in the centre of the gauging zone of the GB 30 or GB 10 gauge. Adjust the GB 30 or GB 10 gauge until the bore gauge indicates zero minus the correction value listed in the GB 30 or GB 10 user instructions.
- Further adjust the GB 30 or GB 10 gauge by increasing the gauge dimension by the value of the desired preload or reduce it by the desired clearance. Zero the dial indicator on the GB 30 or GB 10.
- Place the bearing inner ring and roller set assembly onto the tapered shaft seat. Place the GB 30 or GB 10 gauge over the rollers and drive the inner ring up on the tapered seat until the dial indicator on the GB 30 or GB 10 reads zero.
For additional information, refer to Mounting.
The accuracy of GB 30 and GB 10 gauges is within 1 μm for sizes ≤ 20 (GB 3006 to GB 3020 and GB 1010 to GB 1020) and within 2 μm for sizes ≥ 21 (GB 3021 to GB 3068).