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  2. Drill bit sizes - Wikipedia

    en.wikipedia.org/wiki/Drill_bit_sizes

    Metric drill bit sizes. Metric drill set, 1.0–6.0 mm by 0.1 mm, jobber length. The case that holds them in an indexed order (by size), via a graduated series of holes, is called a drill index. Metric drill bit sizes define the diameter of the bit in terms of standard metric lengths. Standards organizations define sets of sizes that are ...

  3. Drill bit - Wikipedia

    en.wikipedia.org/wiki/Drill_bit

    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 ...

  4. Pilot hole - Wikipedia

    en.wikipedia.org/wiki/Pilot_hole

    Pilot hole. In construction, a pilot hole is a small hole drilled into a piece of construction material. Its purpose may be: locate, guide, and provide clearance for a self-threading screw in wood or plastic to prevent damaging the material or breaking the screw. Throughout history, innovations in simple tools and techniques have profoundly ...

  5. List of drill and tap sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_drill_and_tap_sizes

    Schematic of a machine tap. Below is a comprehensive drill and tap size chart for all drills and taps, 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.

  6. Spade bit (horse) - Wikipedia

    en.wikipedia.org/wiki/Spade_bit_(horse)

    A spade bit A poster illustrating the process of training a spade bit horse. The spade bit is a historic vaquero design for a type of curb bit with straight, highly decorated shanks and a mouthpiece that includes a straight bar, a narrow port with a cricket, and a "spoon," a flat, partly rounded plate affixed above the port, supported by braces on either side.

  7. Drilling - Wikipedia

    en.wikipedia.org/wiki/Drilling

    Drilling is a cutting process where a drill bit is spun to cut a hole of circular cross-section in solid materials. The drill bit is usually a rotary cutting tool, often multi-point. The bit is pressed against the work-piece and rotated at rates from hundreds to thousands of revolutions per minute. This forces the cutting edge against the work ...

  8. Curb bit - Wikipedia

    en.wikipedia.org/wiki/Curb_bit

    A curb bit is a leverage bit, meaning that it multiplies the pressure applied by the rider. Unlike a snaffle bit, which applies direct rein pressure from the rider's hand to the horse's mouth, the curb can amplify rein pressure several times over, depending on the length of the curb's bit shank. Shank sizes vary from the Tom Thumb (2 inches ...

  9. Spade - Wikipedia

    en.wikipedia.org/wiki/Spade

    Spade. A spade is a tool primarily for digging consisting of a long handle and blade, typically with the blade narrower and flatter than the common shovel. [1] Early spades were made of riven wood or of animal bones (often shoulder blades). After the art of metalworking was developed, spades were made with sharper tips of metal.

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