CLASSIFICATION OF AXES OF ROTATION IN ENGINEERING GRAPHICS
Keywords:
engineering graphics; rotation axes; classification of axes; fixed axis; moving axis; instantaneous axis; central axis; screw axis; principal axes; projection axis; view transformation; rigid body rotation; kinematics; geometric modeling; CAD visualization.Abstract
In engineering graphics, the notion of rotation about axes plays a fundamental role in modeling, visualizing, and transforming objects in space. This paper provides a systematic classification of axes of rotation as used in engineering graphics and technical drawing. After an introductory discussion of the geometric and kinematic basis of rotation, we define and categorize the axes of rotation (fixed axes, moving axes, instantaneous axes, central axes, principal axes, etc.). We analyze their properties, interrelationships, and relevance in 2D/3D engineering drawing and CAD modeling. Finally, we summarize the main categories and highlight implications for drawing transformations and visualization.
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