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  2. Pilot hole - Wikipedia

    en.wikipedia.org/wiki/Pilot_hole

    Drilling pilot holes to hammer nails. In construction, a pilot hole is a small hole drilled into a piece of construction material. Its purpose may be: to guide a larger drill to the appropriate location and ease the job of the larger drill,

  3. Punch (tool) - Wikipedia

    en.wikipedia.org/wiki/Punch_(tool)

    A center punch forms a large enough dimple to "guide" the tip of the drill. The tip of a center punch has an angle between 60 and 90 degrees. [1] When drilling larger holes, where the drill bit is wider than the indentation produced by a center punch, the drilling of a pilot hole is usually needed.

  4. Raise borer - Wikipedia

    en.wikipedia.org/wiki/Raise_borer

    The boxhole borer is set up on the lower level, drills a pilot hole as a guide, then drives the reamer bit along the pilot hole from the lower level to the upper. Precautions have to be taken to redirect falling drill cuttings away from the machine, and to reinforce the drill string.

  5. Directional boring - Wikipedia

    en.wikipedia.org/wiki/Directional_boring

    Directional boring tooling includes the suite of drill bits or drill heads used during pilot hole operations, reamers and hole-openers used for hole enlargement, and swab tools which are used for hole conditioning and pullback. Tooling intended to navigate rock, or tougher formations, may use tungsten carbide alloys or polycrystalline diamond ...

  6. Here's What to Do If Your Fireplace Pilot Light Goes ... - AOL

    www.aol.com/heres-fireplace-pilot-light-goes...

    The thermocouple sensor detects the heat from the pilot light and sends a signal to keep the gas valve open, but if the pilot light is extinguished, then the thermocouple will send a signal to the ...

  7. List of screw and bolt types - Wikipedia

    en.wikipedia.org/wiki/List_of_screw_and_bolt_types

    Nominal (thread) sizes range from 0.1875 to 0.375 in (4.763 to 9.525 mm) and lengths from 1.25 to 5 in (32 to 127 mm). Typically an installer uses a hammer drill to make a pilot hole for each concrete screw and a powered impact driver to drive the screw. The drill hole should be 1/2" longer than the depth penetration of the screw.

  8. Alaska Airlines pilot had no idea Boeing plane had giant hole ...

    www.aol.com/news/alaska-airlines-pilot-had-no...

    The terrifying mid-air blowout happened six minutes after taking off when the plane was 16,000 feet in the air.

  9. List of drill and tap sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_drill_and_tap_sizes

    One of the most common ways to produce such threaded holes is to drill a hole of appropriate size with a drill bit and then tap it with a tap. Each standard size of female screw thread has one or several corresponding drill bit sizes that are within the range of appropriate size—slightly larger than the minor diameter of the mating male ...

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