Why is down milling generally avoided?

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Tags

1. #caused
2. #starts
3. #thickness
4. #burnishing
5. #times
6. #rubbing
7. #temperatures
8. #cutting
9. #surface
10. #often
11. #toward
12. #hardened
13. #forced
14. #friction
15. #effect
16. #increases
17. #preceding
18. #creating
19. #reduces
20. #contact