Mechanisms - Cams
The target groups are KS3 and KS4 students of Engineering, Design and Technology.
To enable students to learn about cams in order that they may solve problems and design and make products that include cams.
The objective is that students will know:
• that a cam converts an input motion and force into a reciprocating output motion and force
• that there are linear and rotary cams
• how to use cams in their designing, making and problem solving .
The resources consist of Flash animations, HTML and PDF teaching resources and a PDF lesson plan.
The animations in this resource illustrate linear and rotary cams, parts of a cam, and cam and cam follower.
The lesson plan guides the teaching of mechanisms systems involving cams. The lesson plan suggests a teaching methodology of Presentation, Practice, Production (PPP). The introductory lesson consists of a lead-in, presentation, controlled practice, free practice, production, review and follow on activities.
How to use the resource
Use the lesson plan to guide students through activities that help them develop a thorough understanding of cams.
Differentiation may be achieved through:
• the pace of learning
• the amount of support given to students (by guided questions from the teacher,
• support from peers duringstudent - student interaction.
Follow on activities
1. Students should learn about:
• Chain and sprocket
• Crank and slider
• Friction, lubrication and bearings
• Mechanical systems
• Ratchet and pawl
2. Students should analyse mechanical systems that use cams, i.e. study mechanical systems to understand what the system does, how it’s made, which materials were used etc.
3. Students should record analysis findings by drawing process diagram of each system and subsystem.
4. Students should apply their knowledge to design and build mechanisms using mechanisms kits and/or mechanical components and resistant materials.