I. Copy the underlined words and word-combinations, translate them into Ukrainian and learn them.II. Write out the most important rules you should remember. Comment them. Drilling machine Drilling machines, also called drill presses, cut holes in metal with a twist drill. They also use a variety of other cutting tools to perform the following basic hole-machining operations: (1) reaming, (2) boring, (3) counterboring, (4) countersinking, and (5) tapping internal threads with the use of a tapping attachment. To drill a hole usually hole-making machine-tools are used. They can drill a hole according to some specification, they can enlarge it, or they can cut threads for a screw or to create an accurate size or a smooth finish of a hole. Drilling machines are different in size and function, from portable drills to radial drilling machines, multispindle units, automatic production machines, and deep-hole-drilling machines. I. Copy the underlined words and word-combinations, translate them into Ukrainian and learn them. II. Find the following word-combinations in English in the text: ріжучі інструменти; операції виготовлення отворів; внутрішня різьба; пристосування; просвердлити отвір; надавати точного розміру; гладенька кінцева поверхня отвору; багатошпиндельний; свердлильні верстати для нарізання глибокого отвору.
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