Why Zhouzhong hole hole are matched with each other's accuracy than the low shaft
A mechanical part of a torque or bending moment. Generally round metal rods, each segment may have different diameters. A revolving part of a machine is mounted on a shaft.
Hole in the tolerance and measurement basis, the hole mainly refers to the cylindrical internal surface, also includes the non cylindrical inner surface (by two parallel planes or sections of the inclusion surface). In the mechanical principle and other disciplines, the size and deviation of the hole have been well defined.
The shaft (shaft) is a cylindrical object that is worn between the middle of the bearing or the middle of the wheel or the gear, but a few are square. The shaft supports the rotating parts and rotates with them to convey motion
