I. Copy the underlined words and word-combinations, translate them into Ukrainian and learn them.

Date: 2015-10-07; view: 423.

Drilling machine

II. Write out the most important rules you should remember. Comment them.

I. Copy the underlined words and word-combinations, translate them into Ukrainian and learn them.

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.

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.