Impact tapping, as a novel technology of internal thread processing, has some important effect and a good applied foreground in the machining of small diameter thread, especially for thin board.
A bulletin board system(BBS) hot topic mining algorithm based on fuzzy clustering was developed to solve the problem of the post thread with multiple topics and identifying the outliers in clustering.
The lighting device comprises at least a metal sleeve with a female thread, a printed circuit board, a LED, a microswitch, a spring electrode, a battery and a rear metal cover.