Tapping is the process of cutting a thread in a drilled hole and cutting internal threads. Tapping can be accomplished on a lathe or drilling machine. On a drilling machine it is done by selecting and drilling the
tap drill size, then using the drilling-machine chuck to hold and align the tap while it is turned by hand. There are typically three types of taps used: a tapered tap to facilitate initial thread cutting; an intermediate type, used to progress the thread after it has been started; and a "bottoming" thread, which is used to obtain the full thread depth when cutting partway through the piece.
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