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  2. Drill bit sizes - Wikipedia

    en.wikipedia.org/wiki/Drill_bit_sizes

    Number drill bit gauge sizes range from size 80 (the smallest) to size 1 (the largest) followed by letter gauge size A (the smallest) to size Z (the largest). Although the ASME B94.11M twist drill standard, for example, lists sizes as small as size 97, sizes smaller than 80 are rarely encountered in practice.

  3. Drill bit - Wikipedia

    en.wikipedia.org/wiki/Drill_bit

    The twist drill bit is the type produced in largest quantity today. It comprises a cutting point at the tip of a cylindrical shaft with helical flutes; the flutes act as an Archimedean screw and lift swarf out of the hole. The modern-style twist drill bit was invented by Sir Joseph Whitworth in 1860.

  4. Twist drill - Wikipedia

    en.wikipedia.org/?title=Twist_drill&redirect=no

    Twist drill. From Wikipedia, the free encyclopedia. ... Download as PDF; Printable version; Languages. Add links. This page was last edited on 8 April 2022, at 20:54 ...

  5. Tap and die - Wikipedia

    en.wikipedia.org/wiki/Tap_and_die

    US tap and drill bit size and reference chart [7] Machine screw size Number of threads per inch (TPI) Major diameter Minor diameter Tap drills Clearance drill 75% thread for aluminum, brass, & plastics 50% thread for steel, stainless, & iron Close fit Free fit Drill size Decimal equiv. Drill size Decimal equiv. Drill size Decimal equiv. Drill size

  6. Speeds and feeds - Wikipedia

    en.wikipedia.org/wiki/Speeds_and_feeds

    Cutting speed may be defined as the rate at the workpiece surface, irrespective of the machining operation used. A cutting speed for mild steel of 100 ft/min is the same whether it is the speed of the cutter passing over the workpiece, such as in a turning operation, or the speed of the cutter moving past a workpiece, such as in a milling operation.

  7. List of drill and tap sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_drill_and_tap_sizes

    Below is a comprehensive drill and tap size chart for all drills and taps: Inch, imperial, and metric, up to 36.5 millimetres (1.44 in) in diameter. In manufactured parts, holes with female screw threads are often needed; they accept male screws to facilitate the building and fastening of a finished assembly.

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  9. Dormer Pramet - Wikipedia

    en.wikipedia.org/wiki/Dormer_Pramet

    Dormer Pramet is a global manufacturer and supplier of cutting tools for the engineering industry, including drilling, milling, threading and turning tools. Its origins date back to 1913, making it one of the world's oldest specialist manufacturers of engineers cutting tools.