| 摘要 |
A tapping apparatus in accordance with this invention includes a frame, a spindle mounted on the frame for rotation and axial movement and provided with a tap coupled to one end thereof, the spindle being driven by a driven source, an external thread section formed in the outer periphery of the spindle, a guide member rotatably mounted on the frame and having an internal thread section formed in the inner periphery thereof, the internal thread section being threadably engaged with the external thread section, and a synchronous rotation mechanism for rotatably driving the guide member in synchronization with the spindle so that the axial movement of the spindle agrees with a pitch of the tap.
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