The document discusses a computer aided machine drawing course, including its objectives to teach thread forms, fasteners, keys, joints, and couplings. It provides examples of two types of joints: a cotter joint used to fasten circular rods by inserting a cotter through slots, and a knuckle joint used to fasten rods by inserting a pin through aligned eye and fork ends. Students are instructed to draw the front views of both joints given diameters without part drawings.

1. Department of Robotics & Automation
JSS Academy of Technical Education, Bangalore-560060
Computer Aided Machine Drawing
(Course Code:21RA35)

2. TEXT BOOKS
• Machine Drawing, K R Gopala Krishna, Subhash Publication, 2005.
• Machine Drawing, N D Bhat & V M Panchal, Charoratar publishing house, 2005.
Further Reference:
 National Programme on Technology Enhanced Learning (NPTEL)
https://nptel.ac.in/courses/112103019/

3. • To impart knowledge of thread forms, fasteners, keys, joints and couplings.
Course Learning Objectives

4. Joints
Joints
1. Cotter joint (socket and spigot)
2. Knuckle joint (pin joint)
* Memory drawings: No part drawings will be given.
* All the proportions you need to remember with reference to joints.
* Based on the given dia., you need to draw the Front & Top view of the joints.

5. • This joint is used to fasten two circular rods.
• One end of the rod is formed into a socket and the other into a spigot, and
slots are cut.
• After aligning the socket and spigot ends, a cotter is driven-in through the
slots, forming the joint.
Joints
1. Cotter joint (socket and spigot)

6. 1. Cotter joint (socket and spigot)
Joints

7. 1. Cotter joint (socket and spigot)
Joints

8. 1. Cotter joint (socket and spigot)
Joints

9. Joints

10. 1. Cotter joint (socket and spigot)
Take diameter = 25 mm and draw the front view of cotter joint
Joints

11. 1. Knuckle joint (Pin Joint)
• A knuckle joint is a pin joint used to fasten two circular rods.
• One end of the rod is formed into an eye and the other into a fork (double eye).
• The eye end of the rod is aligned into the fork end of the other and the pin is
inserted through the holes and held in position by means of a collar and a taper
pin.
• The rods are free to swivel about the cylindrical pin.
Applications: used in suspension links, air brake arrangement of locomotives, etc.
Joints

12. 1. Knuckle joint (Pin Joint)
Joints

13. Sheet No.6: Joints
1. Knuckle joint (Pin Joint)

14. 1. Knuckle joint (Pin Joint)
Take diameter = 25 mm and draw the front view of knuckle joint
Joints

15. 1. Knuckle joint (socket and spigot)
Take diameter = 25 mm and draw the front view of knuckle joint
Joints

16. End