Questions: 16. Plane irons must be ground at approximately A. 20°, B. 25°, C. 59°, D. 60°, 17. If a drill becomes overheated during grinding, you should A. pass it under running water. B. wipe it with an oily rag. C. dip it in cool water. D. let it cool in still air. 18. Moving a workpiece back and forth across a grinding wheel causes A. even wheel wear and prevents overheating, B. uneven wear of the wheel. C. the grinding wheel to break. D. the workpiece to overheat.

16. Plane irons must be ground at approximately
A. 20°,
B. 25°,
C. 59°,
D. 60°,
17. If a drill becomes overheated during grinding, you should
A. pass it under running water.
B. wipe it with an oily rag.
C. dip it in cool water.
D. let it cool in still air.
18. Moving a workpiece back and forth across a grinding wheel causes
A. even wheel wear and prevents overheating,
B. uneven wear of the wheel.
C. the grinding wheel to break.
D. the workpiece to overheat.

Transcript text: 16. Plane irons must be ground at approximately A. $20^{\circ}$, B. $25^{\circ}$, C. $59^{\circ}$, D. $60^{\circ}$, 17. If a drill becomes overheated during grinding, you should A. pass it under running water. B. wipe it with an oily rag. C. dip it in cool water. D. let it cool in still aif. 18. Moving a workpiece back and forth across a grinding wheel causes A. even wheel wear and prevents overheating, B. uneven wear of the wheel. C. the grinding wheel to break. D. the workpiece to overheat.

Solution

The answer is B: $25^{\circ}$.
Explanation:

A. $20^{\circ}$: This angle is generally too shallow for most plane irons, which require a steeper angle for effective cutting.
B. $25^{\circ}$: This is the standard angle for grinding plane irons, providing a good balance between sharpness and durability.
C. $59^{\circ}$: This angle is too steep and not suitable for plane irons.
D. $60^{\circ}$: Similar to option C, this angle is too steep for plane irons.

The answer is C: dip it in cool water.
Explanation:

A. Pass it under running water: This could cause thermal shock and potentially damage the drill.
B. Wipe it with an oily rag: This does not effectively cool the drill and could be a fire hazard.
C. Dip it in cool water: This is a common method to quickly cool down a drill without causing damage.
D. Let it cool in still air: This is a slower process and may not be practical if immediate cooling is needed.

The answer is A: even wheel wear and prevents overheating.
Explanation:

A. Even wheel wear and prevents overheating: Moving the workpiece back and forth helps distribute wear evenly across the wheel and reduces the risk of overheating by not concentrating heat in one spot.
B. Uneven wear of the wheel: This is incorrect as moving the workpiece helps prevent uneven wear.
C. The grinding wheel to break: Proper movement of the workpiece does not cause the wheel to break.
D. The workpiece to overheat: Moving the workpiece helps prevent overheating, not cause it.

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