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Manufacturing Engineering Practice Test: Metal Cutting - Tool Wear Failure
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Tool wear is the gradual failure of cutting tools due to regular operation. Tools affected include tipped tools, tool bits, and drill bits that are used with machine tools. Types of wear include: flank wear in which the portion of the tool in contact with the finished part erodes.

The tool wear process has three stages:
Initial wear stage: The cutting edge is new, so the tool wear rate is relatively high.
Steady wear stage
Rapid wear stage

Manufacturing Engineering Practice Test: Metal Cutting - Tool Wear Failure
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14 Questions

1. The relation between the tool life(T) in minutes and cutting speed (V) in m/min is
2. Crater wear is usually found while machining ductile materials.
3. Using the Taylor Equation for tool life and letting n = 0.5 and C = 120, calculate the percentage increase in tool life when the cutting speed is reduced by 50%.
4. Crater wear is predominant in
5. The tool may fail due to
6. Crater wear leads to
7. Tool life is generally better when
8. Flank wear depends upon the
9. Crater wear is mainly due to the phenomenon is known as
10. Crater wear occurs mainly on the
11. Flank wear is due to the abrasive action of hard mis-constituents.
12. The tool life is said to be over if
13. Tool life is measured by the
14. Flank wear occurs mainly on the

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