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For both of these rules of thumb (85%/90% and major minus pitch), the tap drill size yielded is not necessarily the only possible one, but it is a good one for general use. The 85% and 90% rules works best in the range of 1 ⁄ 4 –1 in (6.4–25.4 mm), the sizes most important on many shop floors.
A properly controlled process is also capable of maintaining a consistent size down the entire length of the hole while minimizing the hour-glass effect. Reamed holes may typically have a surface finish of 10 to 25 μin (250 to 640 nm) Ra.
Guna, also called SUPOT, is a Filipino weeding knife with a very short and wide dull blade with a perpendicular blunt end. It is an agricultural tool used mainly for digging roots and weeding gardens, approximating the functions of a garden hoe.
A shell disk with a hole in the center was found next to his right ear and a disk with a hole by the edge was found on his chest. The shell ornaments were dated 4854 B.C. [ 2 ] Duyong Cave, near the Tabon Caves of Palawan's western coast (Philippines) produced a "Neolithic Burial" with four Tridacna shell adzes and two different types of shell ...
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, allow the insertion of another hole-making tool, such as a knockout punch, that will produce the final-sized hole, or
A dental dam or rubber dam is a thin, 6-inch (150 mm) square sheet, usually latex or nitrile, used in dentistry to isolate the operative site (one or more teeth) from the rest of the mouth. Sometimes termed " Kofferdam " (from German ), it was designed in the United States in 1864 by Sanford Christie Barnum [ de ] . [ 1 ]