The optical shaft is a very common shaft component in mechanical products. It is mainly used to support the transmission components and play the role of transmission torque and load bearing. However, since the shaft components have relatively high requirements on their accuracy, does the optical axis also have requirements on the accuracy? The answer is yes, because the optical axis is one of the shaft components, so it also has certain requirements for accuracy. However, its accuracy requirements are generally determined according to the industry or working conditions required by the optical axis. The specific requirements generally include the following three items:

1. Dimensional accuracy

In order to determine the position of the shaft, the supporting journals usually have higher dimensional accuracy (IT 5~IT7), but the dimensional accuracy of the journals for assembling transmission components is generally lower (IT6~IT9).

2. Geometric accuracy

In the geometric shape accuracy of the optical axis, the requirements for the surface accuracy of the inner and outer circles are relatively high, so the allowable deviation should be marked on the drawing. Of course, in addition to the inner and outer circular surfaces, the roundness and cylindricity of its journal, outer cone surface, Morse taper hole, etc. also belong to the range of geometric accuracy.

3. Mutual position accuracy

For the ordinary precision optical axis in the linear guide, the radial runout of the support journal and the shaft segment is generally 0.01~0.03mm. For high-precision shafts (such as spindles), the radial runout of the support journal is usually 0.001~0.005mm. During this process, the journals for assembling the transmission components usually need to support the coaxiality of the journals, otherwise the transmission accuracy of the transmission components may be affected or noise may be generated.

In addition, it is worth noting that the mutual position accuracy of the optical axis is generally determined according to the position and function of the mechanical center axis.