Lesson Notes By Weeks and Term - Senior Secondary 2

Transmission system IV

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TERM – 1ST TERM

WEEK TEN

Class: Senior Secondary School 2

Age: 16 years

Duration: 40 minutes of 5 periods each

Date:

Subject: AUTO MECHANICAL

Topic: TRANSMISSION SYSTEM IV

SPECIFIC OBJECTIVES: At the end of the lesson, pupils should be able to

I.) Describe a shaft

II.) Identify the parts of a shaft

III.) Discuss the operation of a shaft

INSTRUCTIONAL TECHNIQUES: Identification, explanation, questions and answers, demonstration, videos from source

INSTRUCTIONAL MATERIALS: Videos, loud s

peaker, textbook, pictures,

INSTRUCTIONAL PROCEDURES

PERIOD 1-2

PRESENTATION

TEACHER’S ACTIVITY

STUDENT’S

ACTIVITY

STEP 1

INTRODUCTION

The teacher explains what a shaft is and describe it's parts

Students listens attentively to the teacher                                                                          

STEP 2

EXPLANATION

Teacher discusses the step by step operation of a shaft

Students exhibit attentiveness and active engagement

STEP 3

NOTE TAKING

The teacher writes a summarized

note on the board

The students

copy the note in

their books

 

NOTE

TRANSMISSION SYSTEM IV

A Shaft

A shaft is a long, cylindrical mechanical component used to transmit rotary motion or torque from one part of a machine to another. Shafts are commonly found in various mechanical systems such as engines, transmissions, and industrial machinery.

The main parts of a shaft include:

  1. Body: The main cylindrical portion of the shaft that transmits torque.
  2. Ends: The extremities of the shaft where other components such as gears, pulleys, or couplings are attached.
  3. Keyway: A slot machined into the shaft to accommodate a key, which prevents relative rotation between the shaft and the attached component.
  4. Splines: Grooves or teeth machined into the shaft to transmit torque to an attached component without the need for a key.
  5. Bearings: Support the shaft and reduce friction during rotation.
  6. Seals: Prevent the leakage of lubricants or contaminants along the shaft.
  7. Surface Finish: The outer surface of the shaft is typically machined to a smooth finish to reduce friction and wear.

Operation of a shaft

The operation of a shaft depends on its specific application within a mechanical system. Generally, a shaft transmits rotary motion or torque from a power source to various components in a machine. This can involve several  operations:

  1. Torque Transmission: The primary function of a shaft is to transfer torque from one end to the other. Torque is the rotational force produced by a motor or engine, and the shaft serves as a conduit for this force to be applied to other components such as gears, pulleys, or wheels.
  2. Rotation: As torque is transmitted through the shaft, it causes the shaft to rotate. This rotational motion is often used to drive other mechanical components within a system, such as conveyor belts, pumps, or cutting tools.
  3. Support: Shafts are typically supported by bearings or other support structures to maintain their alignment and reduce friction during operation. Proper support is crucial for ensuring smooth and efficient rotation of the shaft.
  4. Alignment: In multi-component systems, shafts must be aligned properly to ensure smooth and efficient operation. Misalignment can lead to excessive wear, vibration, and even system failure.
  5. Coupling: Shafts are often connected to other components such as gears, pulleys, or couplings to transmit motion or torque to different parts of a machine. Couplings allow for the transfer of torque while accommodating slight misalignments between shafts.

EVALUATION: 1. What is a shaft?

  1. Mention 5 parts of a shaft
  2. Discuss briefly, the operation of a shaft.

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively