1 turning brake drums n introduction and pre-checks n lab demonstration n lab student practice --...

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Turning Brake DrumsTurning Brake Drums

Introduction and pre-checksIntroduction and pre-checks Lab demonstrationLab demonstration Lab student practice -- turning Lab student practice -- turning

drumsdrums Classroom wrap-upClassroom wrap-up

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Cracked brake drumCracked brake drum

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ScoringScoring

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Hard spotsHard spots

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Grease-stainedGrease-stained

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High-heat conditionsHigh-heat conditions

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Heat checkingHeat checking

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Out-of-roundOut-of-round

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Rule of thumb for turning Rule of thumb for turning drum:drum:

““Only turn if major imperfections or Only turn if major imperfections or out-of-round condition.”out-of-round condition.”

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The four prechecks:The four prechecks:

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The four prechecks:The four prechecks:

CracksCracks

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The four prechecks:The four prechecks:

CracksCracks

ScoringScoring

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The four prechecks:The four prechecks:

CracksCracks

ScoringScoring

Hard sportsHard sports

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The four prechecks:The four prechecks:

CracksCracks

ScoringScoring

Hard spotsHard spots

Drum max Drum max diameterdiameter

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Parts of brake drum latheParts of brake drum lathe

ArborArbor

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Parts of brake drum latheParts of brake drum lathe

ArborArbor Adapter cups and conesAdapter cups and cones

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Parts of brake drum latheParts of brake drum lathe

ArborArbor Adapter cups and conesAdapter cups and cones Special bearing race adaptersSpecial bearing race adapters

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Parts of brake drum latheParts of brake drum lathe

ArborArbor Adapter cups and conesAdapter cups and cones Special bearing race adaptersSpecial bearing race adapters Carbide cutting bitCarbide cutting bit

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Mounting the brake drumMounting the brake drum

Correct adaptersCorrect adapters

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Mounting a brake drumMounting a brake drum

Correct adaptersCorrect adapters Rubber-centered sleeveRubber-centered sleeve

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Mounting a brake drumMounting a brake drum

Correct adaptersCorrect adapters Rubber-centered sleeveRubber-centered sleeve Silencing bandSilencing band

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Surfacing the drumSurfacing the drum

Light glaze? Use #80-grit Light glaze? Use #80-grit sandpapersandpaper

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Surfacing the drumSurfacing the drum

Light glaze? Use #80-grit Light glaze? Use #80-grit sandpapersandpaper

Remove as little as possibleRemove as little as possible

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Surfacing the drumSurfacing the drum

Light glaze? Use #80-grit Light glaze? Use #80-grit sandpapersandpaper

Remove as little as possibleRemove as little as possible

Two cuts: ‘Rough’ followed by Two cuts: ‘Rough’ followed by ‘finish’‘finish’

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Surfacing the drumSurfacing the drum

Light glaze? Use #80-grit sandpaperLight glaze? Use #80-grit sandpaper

Remove as little as possibleRemove as little as possible

Two cuts: ‘Rough’ followed by ‘finish’Two cuts: ‘Rough’ followed by ‘finish’

#80-grit sandpaper final finish#80-grit sandpaper final finish

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What’s next?What’s next?

Continue on brake technologyContinue on brake technology

Prepare for ASE certificationPrepare for ASE certification

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