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Mechanotechnics N6
This document includes important informa on about the revised curriculum for Mechanotechnics N6, scheduled for implementa on in 2021. Main changes to the curriculum
New content
General aims • No longer concerned about the Chris an na onal norms. Evalua on • Weigh ng of Knowledge and Understanding has decreased from 10–40 to 10–25; Applica on has gone from 30 to 30–40 and Analysis, Synthesis and Evalua on has gone from 20 to 20–35. Module 1: Clutches (10%)
• Iden fy the primary func ons of clutches.
• Old syllabus only specified ability to do advanced calcula ons from basic principles on plate, cone and centrifugal clutches, including axial forces, torque and power.
• Draw and label mul -plate clutches.
• Overview of new content: – Includes content on the func ons, applica ons and theories that students will be required to recall, define, describe and explain. – Students will be required to draw labelled diagrams. – Many new calcula ons have been prescribed.
• Explain theories of plate and cone clutches, such as uniform wear theory and uniform pressure theory. • Define conical clutches and explain their applica ons. • Describe and explain the applica ons of centrifugal clutches. • Perform numerous advanced calcula ons from basic principles: force required to press the plates together, the number of contact pairs required in a plate clutch to apply the required pressure, the combined speed between the engine and sha s at the moment no slip occurs, total me of slip, total me of sha to reach certain speed, torque, retarda on torque of engine or sha , combined speed, fric onal force, axial force to transmit given torque, total axial force to engage the clutch, moment of iner a, angular velocity, angular accelera on, me, maximum pressure, pressure at outer diameters, centrifugal force, force on spring, fric onal force, angular velocity, mass of shoe, power.
Module 2: Brakes (10%)
General introduc on
• Old syllabus only specified ability to do advanced calcula ons from basic principles on band and block brakes, including tensions, torque and braking me.
• Explain the basic principles of brakes. • List the elements that are applied in brake design.
Mechanotechnics N6
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