Is there vertical difference in tapered bearing raceway?

Tapered bearing raceway has vertical difference. According to relevant data, the perpendicularity between raceway and end face of tapered bearing is required and generally meets the requirements. However, in the existing processing technology, the whole end face is perpendicular to the raceway, but the axial height of the end face is different at different positions inside and outside, which is commonly known as gradient difference in the industry. The gradient of several microns has a great influence on the angle, ranging from tens of seconds to several minutes. The raceway angle is adjusted by this single position reference. The influence is very great (even if the perpendicularity between the end face and the bearing axis is very good, there is a gradient difference between the end face at a single position, and the angle error caused by the gradient of 2-3 microns is very large), which further leads to the influence of incorrect crown value, shape and symmetry.