Which tap type should NOT be used to initiate a new thread in a hole?
Bottoming tap
The question is about identifying which type of tap should not be used to initiate a new thread in a hole. Let's explore the options provided:
- Bottoming Tap: This tap has a continuous cutting edge that extends to nearly the full length of the tap. It is typically used to cut threads to the bottom of a blind hole. However, it requires a pre-existing thread to guide it because without an initial thread, the tap cannot start threading efficiently at the blind hole's base. Therefore, it is not suitable for initiating a new thread.
- Plug Tap: This tap is more conical than a bottoming tap but less so than a taper tap. It is generally used for starting a thread in a hole that does not need a taper start. It can be used to initiate threading.
- Taper Tap: This tap has a very gradual entry taper and is used to initially thread a hole. It is most effective for starting threads because the taper provides a gradual engagement with the material.
- Intermediate Tap: It can refer to a tap with moderate starting and finishing threads. However, it's not as commonly categorized separately in universal tap standards, but generally resembles plug taps in function, capable of initiating threads.
Considering the features and typical uses of these tap types, the Bottoming Tap should not be used to start a new threading operation. It is designed for bottoming operations where a pre-existing thread is already established.
Thus, the correct answer is: Bottoming Tap.
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