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2. Drill bit - Wikipedia

   en.wikipedia.org/wiki/Drill_bit

   Nowadays, the drill bit is usually made by rotating the bar while moving it past a grinding wheel to cut the flutes in the same manner as cutting helical gears. Twist drill bits range in diameter from 0.002 to 3.5 in (0.051 to 88.900 mm) [9] and can be as long as 25.5 in (650 mm). [10]

3. Grinding (abrasive cutting) - Wikipedia

   en.wikipedia.org/wiki/Grinding_(abrasive_cutting)

   Grinding is a subset of cutting, as grinding is a true metal-cutting process. Each grain of abrasive functions as a microscopic single-point cutting edge (although of high negative rake angle), and shears a tiny chip that is analogous to what would conventionally be called a "cut" chip (turning, milling, drilling, tapping, etc.) [citation needed].

4. Drilling - Wikipedia

   en.wikipedia.org/wiki/Drilling

   However, with that shape of bit cutting edge, the drill is pushing the metal away, rather than grabbing the metal. This creates high friction and very hot swarf. Magnetic Drilling Machine (manufactured by BDS Maschinen GmbH, Germany) For heavy feeds and comparatively deep holes oil-hole drills are used in the drill bit, with a lubricant pumped ...

5. Grinding machine - Wikipedia

   en.wikipedia.org/wiki/Grinding_machine

   Tool and cutter grinder, which usually can perform the minor function of the drill bit grinder or other specialist toolroom grinding operations. Jig grinder, which as the name implies, has a variety of uses when finishing jigs, dies, and fixtures. Its primary function is in the realm of grinding holes for drill bushings and grinding pins. It ...

6. Roller cone bit - Wikipedia

   en.wikipedia.org/wiki/Roller_cone_bit

   A roller-cone bit is a drill bit used for drilling through rock that features 2 or 3 abrasive, spinning cones that break up rock and sediment as they grind against it. Roller-cone bits are typically used when drilling for oil and gas. [1] A water jet flowing through the bit washes out the rock in a slurry. [2]

7. Bench grinder - Wikipedia

   en.wikipedia.org/wiki/Bench_grinder

   These types of grinders are commonly used to hand grind various cutting tools and perform other rough grinding. [1] Depending on the bond and grade of the grinding wheel, it may be used for sharpening cutting tools such as tool bits, drill bits, chisels, and gouges. Alternatively, it may be used to roughly shape metal prior to welding or fitting.