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2. Punch (tool) - Wikipedia

   en.wikipedia.org/wiki/Punch_(tool)

   A center punch forms a large enough dimple to "guide" the tip of the drill. The tip of a center punch has an angle between 60 and 90 degrees. [ 1 ] When drilling larger holes, where the drill bit is wider than the indentation produced by a center punch, the drilling of a pilot hole is usually needed.

3. Drill bit - Wikipedia

   en.wikipedia.org/wiki/Drill_bit

   From top: Spade, brad point, masonry, and twist drills bits Drill bit (upper left), mounted on a pistol-grip electric drill A set of masonry drills. A drill bit is a cutting tool used in a drill to remove material to create holes, almost always of circular cross-section. Drill bits come in many sizes and shapes and can create different kinds of ...

4. 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).

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   $20 at Amazon $20 at Acme Tools $20 at Lowe's. ... if necessary. They have three heat settings, up to 131-degree Fahrenheit. ... as one user recommends, take a vacuum attachment to it to clear it ...

6. This Powerful DeWalt 20V Max Hammer Drill Is Perfect ... - AOL

   www.aol.com/powerful-dewalt-20v-max-hammer...

   This drill is a big upgrade over a standard model—not to mention a huge game changer for drilling into tougher materials. This Powerful DeWalt 20V Max Hammer Drill Is Perfect for Spring Projects ...

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8. Chuck (engineering) - Wikipedia

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

   A drill chuck is a specialised self-centering, three-jaw chuck, usually with capacity of 0.5 in (13 mm) or less, and rarely greater than 1 in (25 mm), used to hold drill bits or other rotary tools. This type of chuck is used on tools ranging from professional equipment to inexpensive hand and power drills for domestic use.

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