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  2. Drill bit - Wikipedia

    en.wikipedia.org/wiki/Drill_bit

    The brad point drill bit (also known as lip and spur drill bit, and dowel drill bit) is a variation of the twist drill bit which is optimized for drilling in wood. Conventional twist drill bits tend to wander when presented to a flat workpiece. For metalwork, this is countered by drilling a pilot hole with a spotting drill bit.

  3. List of screw drives - Wikipedia

    en.wikipedia.org/wiki/List_of_screw_drives

    Instead, a one-way screw can be removed by drilling a hole through the head of the screw and inserting a screw extractor. Alternatively, a rotary tool with cutting disk can be used to extend the slot, the head can be gripped with locking pliers, or the screw can be removed with a pin spanner (snake-eyes driver) after drilling two holes in the ...

  4. Drill - Wikipedia

    en.wikipedia.org/wiki/Drill

    A geared head drill press, with up to eight possible speeds accessible via shift levers on the head and a two speed motor control immediately in front of the quill handle. A geared head drill press transmits power from the motor to the spindle through spur gearing inside the machine's head, eliminating a flexible drive belt. This assures a ...

  5. List of components of oil drilling rigs - Wikipedia

    en.wikipedia.org/wiki/List_of_components_of_oil...

    Drill bit (#26) is a device attached to the end of the drill string that breaks apart the rock being drilled. It contains jets through which the drilling fluid exits. Drill floor (#21) is the area on the rig where the tools are located to make the connections of the drill pipe, bottom hole assembly, tools and bit. It is considered the main area ...

  6. Trepanning - Wikipedia

    en.wikipedia.org/wiki/Trepanning

    Additionally, the specially designed drills come with a safety feature that prevents the drill from penetrating into the brain tissue (through the dura mater). Along with antisepsis and prophylaxis of infection, modern neurosurgery is a common procedure for many reasons other than head trauma.

  7. List of drill and tap sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_drill_and_tap_sizes

    Below is a comprehensive drill and tap size chart for all drills and taps, imperial and metric, up to 36.5 millimetres (1.44 in) in diameter. In manufactured parts, holes with female screw threads are often needed; they accept male screws to facilitate the building and fastening of a finished assembly.

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