CAD/CAM Concepts Mechanical Basics

Design Procedure for Knuckle Joint & Cotter Joint-Formulas, Specifications

Design Procedure for Knuckle Joint: When there is a requirement of a small amount of flexibility or angular moment, Knuckle joint is used.

A knuckle joint is used to connect two rods which are under a tensile load. In this article, I am going to publish the detailed design procedure for KNUCKLE JOINT.

What is the Design Procedure for KNUCKLE JOINT

The design procedure for KNUCKLE JOINT is made to calculate:

  • The outside diameter of eye or fork(mm)
  • The thickness of each eye
  • The enlarged diameter of each rod by an empirical relationship
  • Diameters of the pin by shear considerations
  • Bending considerations.

Specifications for Knuckle Joint:

  • Outside diameter of eye or fork(mm) =d0
  • The thickness of each eye or fork (mm) =a
  • The thickness of the eye end of rod = b
  • Diameter of Knuckle Pin(mm) =d
  • The diameter of Pinhead =d1
What is the Design Procedure for KNUCKLE JOINT
What is the Design Procedure for KNUCKLE JOINT

The detailed explanation for the Design Procedure for Knuckle Joint is shown below in the form of video.

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This is the complete explanation of the Design Procedure for Knuckle Joint which is shown in a detailed manner. If you have any doubts, feel free to ask from the comments section. 


Let’s discuss Cotter Joint…

Design Procedure for Cotter Joint:

Cotter joint is used to connect two rods subjected to compressive or axial tensile loads. It is not at all suitable to connect rotating shafts which transmit torque.

Cotter joint is widely used to connect the piston rod and crosshead of a steam engine, as a joint between the piston rod and the tailor pump rod, foundation bolt, etc.

In this article, I am going to publish the Design Procedure for Cotter Joint.

What is the Design Procedure for Cotter Joint

The Design Procedure for Cotter Joint is made to calculate:

  • The diameter of each rod
  • The thickness of the cotter by an empirical relationship
  • Diameter of the spigot  on the basis of tensile stress
  • Shear failure
  • Crushing failure of spigot etc.

The formulas required for the cotter joint to calculate the above conditions are shown below:

formulaes of cotter Joint
formulas of cotter Joint

The remaining part for the design procedure of a cotter joint is presented in the form of a video which is shown below.

This is the complete explanation of the Design Procedure for Cotter Joint which is shown in a detailed manner. If you have any doubts, feel free to ask from the comments section. Please Share and Like this blog with the whole world so that it can reach to many.

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