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In a machining operation, if a cutting tool traces the workpiece such that the directrix is perpendicular to the plane of the generatrix as shown in figure, the surface generated is

In a machining operation, if a cutting tool traces the workpiece such that the directrix is perpendicular to the plane of the generatrix as shown in figure, the surface generated is Correct Answer Cylindrical

Explanation:

Mechanism and shapes formation by cutting:

  • The motion responsible for the cutting action is known as the primary motion or cutting motion.
  • The motion responsible for gradual feeding the uncut portion is termed as the secondary motion or feed motion.
  • The line generated by the cutting motion is called generatrix and the line generated from the feed motion is called the directrix.
  • Various geometries can be obtained depending on the shapes of the generatrix and the directrix and their relative directions.


Generation of various surfaces:

Generatrix (G) Directrix (D) Surface obtained Process
Straight line Straight line Plain Surface Tracing of G
Circular Straight line Cylindrical Surface Tracing of G
Circular Straight line Plain Surface (Lines) envelope of G
Plain Curve Circular Surface of revolution Tracing of G

 

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