Spindle

A main shaft is a shaft that receives power from an engine or electric motor and transmits it to other parts. The spindle is also called the "optical axis" and is the abbreviation of "main optical axis": the diameter of the symmetry in the optical group. For example, the main axis of the spherical mirror is a straight line perpendicular to the mirror surface through the center of the mirror. The main axis of the lens or optical axis optical set is the line connecting the centers of the respective lens faces. Concept A spindle is a shaft that receives power from an engine or electric motor and transmits it to other parts. The spindle is also called the "optical axis" and is the abbreviation of "main optical axis": the diameter of the symmetry in the optical group. For example, the main axis of the spherical mirror is a straight line perpendicular to the mirror surface through the center of the mirror. The main axis of the lens or optical axis optical set is the line connecting the centers of the respective lens faces.
Mechanical engineering
1.[principal axis]

2. Through any three mutually perpendicular axes of a given point of a rigid body, the moment of inertia or maximum or minimum relative to these axes

3. A spherical mirror or lens system is symmetrical about it, passing both the center of their surface and the center of their curvature

4. A line passing through the focal point of the conical plane perpendicular to the alignment line

5.[main shaft]: [such as in the machinery factory or on the car] main drive shaft

6. [caudex]: a spindle of a plant including stems and roots

7. The stem of a palm or tree fern, wrapped in a permanent leaf base or with significant leaf marks

8. A wooden base of perennial plants

9. Can also be used for article clues, described around a main line, this main line is called the main axis
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