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Machine Drawing Lab Lab Experiments

Drafting of knuckle joint

Drafting of knuckle joint



To draft a knuckle joint using auto cad 2016 Software used: auto cad 2016

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 the required knuckle joint by taking suitable dimensions
  7. Select part 1 fork end and draw 2D object and use CAD feature on it
  8. Select part 2 eye and draw 2D object and dimensions and use CAD feature on it Select part 4
  9. cotter draw 2D object and use CAD feature on it
  10. Select the parts tapper pin it should be in tapered position Assemble all parts by using command join
  11. Give the dimensions on knuckle joint and change the require dimensions style


The required knuckle joint is drafted by using auto cad 2016