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Chip-thickness variation in up (conventional) milling In up milling, how does the instantaneous chip thickness vary from the start to the end of the tooth engagement? Choose the correct pattern.

Difficulty: Easy

Minimum at the beginning; maximum at the end
Maximum at the beginning; minimum at the end
Uniform throughout the cut
None of these

Correct Answer: Minimum at the beginning; maximum at the end

Explanation:

Concept
In up (conventional) milling, the tooth starts cutting with zero chip thickness and exits with the maximum thickness. This is opposite to down milling.

Why
The instantaneous uncut chip thickness grows as the relative sliding between the tooth and work increases along the engagement path.

Final Answer
Minimum at the beginning; maximum at the end.

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