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Pilot holes may be used when driving a screw, typically in wood, concrete, or plastic where the screw cuts its own threads. When a screw is driven into a material without a pilot hole, it can act as a wedge, generating outward pressure which can cause many materials to split. By drilling a small pilot hole into the material, into which a screw ...
A gimlet is a hand tool for drilling small holes, mainly in wood, without splitting. It was defined in Joseph Gwilt's Architecture (1859) as "a piece of steel of a semi-cylindrical form, hollow on one side, having a cross handle at one end and a worm or screw at the other".
mirror screw: This is a flat-head wood screw with a tapped hole in the head, which receives a screw-in chrome-plated cover. It is usually used to mount a mirror. sheet metal screw: Has sharp threads that cut into a material such as sheet metal, plastic or wood. They are sometimes notched at the tip to aid in chip removal during thread cutting.
Integrated screws appear to be common in the US but are almost unknown in the UK and Europe. The dies shown in the image to the right are adjustable: top left: an older split die, with top adjusting screw; bottom left: a one piece die with top adjusting screw; center: a one piece die with side adjusting screw (barely visible on the full image)
Some screws are driven into intact wood; larger screws are usually driven into a hole narrower than the screw thread, and cut the thread in the wood. Early wood screws were made by hand, with a series of files, chisels, and other cutting tools, and these can be spotted easily by noting the irregular spacing and shape of the threads, as well as ...
Although the holes can be plugged the pocket hole may be considered unsightly when all sides of the joint are visible. It is not suitable for joining thin pieces of wood. The boards must have a minimum thickness of 10 to 15 mm (3 ⁄ 8 to 9 ⁄ 16 in). Pocket-hole joints are substantially weaker than joints which use dowels, or mortises. [8]