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Machine Drawing Lab Lab Experiments

To draw conventional machine Components and materials

Conventional representation of materials and machine components


As a variety of materials are used for machine components in engineering applications, it is preferable to have different conventions of section lining to differentiate between various materials. The recommended conventions in use are shown in Fig.


Conventional Representation of Materials

Machine Components:When the drawing of a component in its true projection involves a lot of time, its convention may be used to represent the actual component. Figure shows typical examples of conventional representation of various machine components used in engineering drawing.


Conventional Representation of Machine Components


Conventional Representation of Machine Components


Experiment Aim: To draw conventional machine Components and materials.

Software used:

Auto cad 2016

Commands used:

Draw commands:Line, Rectangle, Poly line, Polygon, Circle, Construction line, Arc, Spline, Ray, Hatch.

Modify commands:Erase,Copy,Mirror,Array,Move,Rotate,Trim,Extend,Stretch,Fillet,Join, Chamfer.

Dimension command:

  • Radius dimension
  • Linear dimension
  • Diameter dimension
  • Angular dimension


  1. Specify units by using units command unit change the insertsents by given and click on OK button
  2. Now you have to specify drawing size using LI enter command First enter 0, 0 and enter 420,297 and click enter
  3. Reset model space limits
  4. Specify lower left corner or [on/off] <0, 0>0, 0
  5. Specify upper right corner <12, 9> 420,297 Refit the screen by using zoom command
  6. Draw required convention by taking suitable dimension
  7. Draw convention representation of metal Specify convention by hatch command Save the drawn diagram at a specified folder


The required conventional machine and materials is drafted in auto cad 2016 software.