The starting point of drilling is called orifice, the side is called hole wall and the bottom is called hole bottom. Borehole diameter d is called aperture for short, orifice diameter is called open aperture, and hole bottom diameter is called final aperture. The distance h from the orifice to the bottom of the hole is called drilling depth, which is called hole depth for short. A section of a borehole is called a hole section.
Usually refers to drilling through hard objects with sharp rotating tools. Drill holes in the board. Drill holes in several places for a metal plate. Drill holes in solid materials with a rock drill. Drill holes in granite. 2. It refers to punching a row of small holes or patterns (commonly used machines) for decoration, identification or easy separation. A boat-shaped gem, shaped like a canoe, is sometimes drilled into a pendant.
Extended data:
Drill through hard objects with sharp rotating tools. Drill holes in the board. Drill holes in several places for a metal plate. Drill holes in solid materials with a rock drill. Drill holes in granite. 2. It refers to punching a row of small holes or patterns (commonly used machines) for decoration, identification or easy separation. A boat-shaped gem, shaped like a canoe, is sometimes drilled into a pendant.
Because of the small aperture, the spindle speed of bench drill is generally high, the highest can be as high as nearly 10 thousand revolutions, and the lowest is about 400 revolutions. The rotating speed of the spindle can be adjusted by changing the position of the V-belt on the pulley. The spindle feed of bench drill is realized by rotating the feed handle.
Before drilling, the distance between the workbench and the spindle frame should be adjusted according to the height of the workpiece, and locked and fixed (combined with wall chart and physical demonstration). Bench drill is small and flexible, easy to use and simple in structure. It is mainly used to process all kinds of small holes on small workpieces. Widely used in instrument manufacturing, fitter and assembly.
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