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Larger than 15° side cutting edge angle
Answer & Solution
Correct Answer:
Option
C
The correct option is "Produces chipping and decreases tool life" (Option C).
The side cutting edge angle (SCEA) influences how the cutting force is distributed along the tool edge.
When SCEA is larger than 15°, the cutting edge becomes weaker because a longer portion of the edge is engaged in cutting. This reduces its strength, increases the chance of edge chipping, and ultimately decreases tool life.
Why not the others?
"Increases tool life" can be true up to a certain optimum angle, but beyond 15° the edge weakens and tool life reduces.
"Decreases tool life" is incomplete because the main reason is chipping due to weakening of the cutting edge.
"Results in excessive stress concentration and greater heat generation" is not the direct effect of a large SCEA; the main drawback is weakening of the edge.
Therefore, for exam purposes, the correct answer is Produces chipping and decreases tool life.
The side cutting edge angle (SCEA) influences how the cutting force is distributed along the tool edge.
When SCEA is larger than 15°, the cutting edge becomes weaker because a longer portion of the edge is engaged in cutting. This reduces its strength, increases the chance of edge chipping, and ultimately decreases tool life.
Why not the others?
"Increases tool life" can be true up to a certain optimum angle, but beyond 15° the edge weakens and tool life reduces.
"Decreases tool life" is incomplete because the main reason is chipping due to weakening of the cutting edge.
"Results in excessive stress concentration and greater heat generation" is not the direct effect of a large SCEA; the main drawback is weakening of the edge.
Therefore, for exam purposes, the correct answer is Produces chipping and decreases tool life.
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