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2. Drill - Wikipedia

   en.wikipedia.org/wiki/Drill

   Drills optimized for this purpose have a clutch to avoid damaging the slots on the screw head. Pistol-grip drill – the most common hand-held power drill type. Right-angle drill – used to drill or drive screws in tight spaces. Hammer drill – combines rotary motion with a hammer action for drilling masonry. The hammer action may be engaged ...

3. Drill bit - Wikipedia

   en.wikipedia.org/wiki/Drill_bit

   While the above is a common use of center drill bits, it is a technically incorrect practice and should not be considered for production use. The correct tool to start a traditionally drilled hole (a hole drilled by a high-speed steel (HSS) twist drill bit) is a spotting drill bit (or a spot drill bit, as they are referenced in the U.S.). The ...

4. Pocket-hole joinery - Wikipedia

   en.wikipedia.org/wiki/Pocket-hole_joinery

   When joining boards at a right angle, it is important that the cuts are precise and square to prevent gaps or un-perpendicular joints between the boards. Some woodworkers lay out their project before drilling their pocket holes and mark the face of the board that they want to drill to ensure the hole is in the correct location.

5. Machine taper - Wikipedia

   en.wikipedia.org/wiki/Machine_taper

   It is one of the most widely used types, and is particularly common on the shank of taper-shank twist drills and machine reamers, in the spindles of industrial drill presses, and in the tailstocks of lathes. The taper angle of the Morse taper varies somewhat with size but is typically 1.49 degrees (around 3 degrees included).

6. Ball-peen hammer - Wikipedia

   en.wikipedia.org/wiki/Ball-peen_hammer

   The head of a diagonal-peen hammer, as the name implies, has a wedge set at a 45° angle from the handle; it can be a left angle or a right angle, and some peen hammers have a double diagonal wedge [3] for ergonomic reasons. [7] They are commonly used by blacksmiths during the forging process to deliver blows for forging or to strike other ...

7. Chuck (engineering) - Wikipedia

   en.wikipedia.org/wiki/Chuck_(engineering)

   A pin chuck is a specialized chuck designed to hold small drills (less than 1 mm (0.039 in) in diameter) that could not be held securely in a normal drill chuck. The drill is inserted into the pin chuck and tightened; the pin chuck has a shaft which is then inserted into the larger drill chuck to hold the drill securely.