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2. Drill bit - Wikipedia

   en.wikipedia.org/wiki/Drill_bit

   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 included angle of the spotting drill bit should be the same as, or greater than, the conventional drill bit so that the drill bit will then ...

3. Annular cutter - Wikipedia

   en.wikipedia.org/wiki/Annular_cutter

   A tungsten carbide tipped (TCT) and high-speed steel (HSS) annular cutter (also known as a "core drill" or "hole saw"). An annular cutter (also called a core drill, core cutter, broach cutter, trepanning drill, hole saw, or cup-type cutter) is a form of core drill used to create holes in metal.

4. Drill bit shank - Wikipedia

   en.wikipedia.org/wiki/Drill_bit_shank

   Morse taper drills, from 13.5mm (with the No. 1 Morse taper shank) through to a 30mm drill (No. 4 morse taper shank) Morse Taper Drill Bit Shank. The Morse taper twist drill bits pictured right are used in metalworking. The full range of tapers is from 0 to 7. The Morse taper allows the bit to be mounted directly into the spindle of a drill ...

5. Drill bit sizes - Wikipedia

   en.wikipedia.org/wiki/Drill_bit_sizes

   For Morse taper-shank drill bits, the standard continues in 1/64 inch increments up to 1¾ inch, then 1/32 inch increments up to 2¼ inch, 1/16 inch increments up to 3 inches, 1/8 inch increments up to 3¼ inches, and a single 1/4 inch increment to 3½ inches. One aspect of this method of sizing is that the size increment between drill bits ...

6. Reamer - Wikipedia

   en.wikipedia.org/wiki/Reamer

   The high cobalt versions are very resistant to heat and thus excellent for reaming abrasive and/or work hardening materials such as titanium and stainless steel. Tungsten carbide More expensive than high-speed steels. Hardness up to HRC 92. Will outlast high-speed steels (usually by about 10:1) when reaming steel. Required to ream hardened ...

7. Core drill - Wikipedia

   en.wikipedia.org/wiki/Core_drill

   This is the reason that diamond-tipped core drills are commonly used in construction to create holes for pipes, manholes, and other large-diameter penetrations in concrete or stone. Core drills are used frequently in mineral exploration where the drill string may be several hundred to several thousand feet in length. The core samples are ...