1. 1 Turning Brake Drums n Introduction and pre-checks n Lab demonstration n Lab student practice -- turning drums n Classroom wrap-up

2. 2 Cracked brake drum

3. 3 Scoring

4. 4 Hard spots

5. 5 Grease-stained

6. 6 High-heat conditions

7. 7 Heat checking

8. 8 Out-of-round

9. 9 Rule of thumb for turning drum: “Only turn if major imperfections or out- of-round condition.”

10. 10 The four prechecks:

11. 11 The four prechecks: n Cracks

12. 12 The four prechecks: n Cracks n Scoring

13. 13 The four prechecks: n Cracks n Scoring n Hard sports

14. 14 The four prechecks: n Cracks n Scoring n Hard spots n Drum max diameter

15. 15 Parts of brake drum lathe n Arbor

16. 16 Parts of brake drum lathe n Arbor n Adapter cups and cones

17. 17 Parts of brake drum lathe n Arbor n Adapter cups and cones n Special bearing race adapters

18. 18 Parts of brake drum lathe n Arbor n Adapter cups and cones n Special bearing race adapters n Carbide cutting bit

19. 19 Mounting the brake drum n Correct adapters

20. 20 Mounting a brake drum n Correct adapters n Rubber-centered sleeve

21. 21 Mounting a brake drum n Correct adapters n Rubber-centered sleeve n Silencing band

22. 22 Surfacing the drum n Light glaze? Use #80-grit sandpaper

23. 23 Surfacing the drum n Light glaze? Use #80-grit sandpaper n Remove as little as possible

24. 24 Surfacing the drum n Light glaze? Use #80-grit sandpaper n Remove as little as possible n Two cuts: ‘Rough’ followed by ‘finish’

25. 25 Surfacing the drum n Light glaze? Use #80-grit sandpaper n Remove as little as possible n Two cuts: ‘Rough’ followed by ‘finish’ n #80-grit sandpaper final finish

26. 26 What’s next? n Continue on brake technology n Prepare for ASE certification

27. 27