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2. Speeds and feeds - Wikipedia

   en.wikipedia.org/wiki/Speeds_and_feeds

   e.g. for a cutting speed of 100 ft/min (a plain HSS steel cutter on mild steel) and diameter of 10 inches (the cutter or the work piece) R P M = C u t t i n g S p e e d × 12 π × D i a m e t e r = 12 × 100 f t / m i n 3 × 10 i n c h e s = 40 r e v s / m i n {\displaystyle RPM={CuttingSpeed\times 12 \over \pi \times Diameter}={12\times 100ft ...

3. Router (woodworking) - Wikipedia

   en.wikipedia.org/wiki/Router_(woodworking)

   Bits also differ by the diameter of their shank, with 1 ⁄ 2-inch, 12 mm, 10 mm, 3 ⁄ 8-inch, 8 mm and 1 ⁄ 4-inch and 6 mm shanks (ordered from thickest to thinnest) being the most common. Half-inch bits cost more but, being stiffer, are less prone to vibration (giving smoother cuts) and are less likely to break than the smaller sizes.

4. 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.

5. V-block - Wikipedia

   en.wikipedia.org/wiki/V-block

   V-Blocks are precision metalworking jigs typically used to hold round metal rods or pipes for performing drilling or milling operations. They consist of a rectangular steel or cast iron block with a 120 degree channel rotated 45-degrees from the sides, forming a V-shaped channel in the top. A small groove is cut in the bottom of the "V".

6. List of screw drives - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_drives

   In Japan, the male sizes are often designated as DTC-20, DTC-27, DTC-40 (discontinued) and DTC-45 corresponding to a respective screw head size of 3.2 mm, 4.6 mm, 6.4 mm and 7.7 mm; with the size of the screw measured across the widest portion of the mating part of the head. The most common sizes in use for consumer electronics are DTC-20 and ...

7. Groove metal - Wikipedia

   en.wikipedia.org/wiki/Groove_metal

   Groove metal, sometimes also called neo-thrash or post-thrash, [1] is a subgenre of heavy metal music that began in the early 1990s. The genre is primarily derived from thrash metal , but played in slower tempos, and making use of rhythmic guitar parts.