Part of Lesson Plan: **Turning Brake Drums (updated) By Eli Jaramillo
Activity Overview / Details
- PowerPoint Presentation "Turning a brake drum" slides 8 and 9
- Four or more brake drums (Will be used by students for measuring)
- Four or more brake drum micrometers (Also to be used by students)
- Safety glasses for all students observing this demonstration
Instructor Note: Use a brake drum and a brake drum micrometer to demonstrate the following:
(Slide #8): Instructor: "Another condition called out-of-round may cause the brake pedal to 'pulsate' . The drums should be machined to restore roundness of the drum frictional surface. In this slide, we see a drum being checked for this out-of-round condition."
Instructor Note: Show a brake drum with an out-of-round condition. Use the brake drum micrometer on this drum and show the reading on the scale.
Instructor: "Now we'll measure the drum inner diameter with an accurate brake drum micrometer. Notice the dial and how I fit it to the brake drum. When we measure, there should be no variation in the drum inner diameter greater than .002 inch."
Instructor: "Any questions on what we've covered so far?"
(Slide #9): Instructor: " What's a 'rule of thumb' to follow about turning brake drums?" ( Drums should be turned only if there are major imperfections or an out-of-round condition).
Instructor: "What's another important rule of thumb when turning the brake drum on one side of the vehicle? (Turn the brake drum on the other side to the same diameter).
Materials / Resource
- PowerPoint: Turning a Brake DrumowerPoint: Turning a Brake Drum [ Download ] PowerPoint presentation used by the instructor for the lecture.