Speaking

Exercise 6. Work in pairs. Discuss advantages and disadvantages of the screw machines usage. Use the following phrases:From my point of view …

I think … I don’t know, but … Maybe you’re right … Don’t you think … That’s true, but…

I see what you mean, but … Oh, I agree entirely … My own view/opinion exactly … I’m not sure … That’s not the way I see it … I agree in principle, but …

Section IV. Milling Machines

Grammar : Non-final forms.

Speaking:. Milling Machines. Milling Machines

Study vocabulary:

milling machine – фрезерный станок series – серия, ряд cutting edge – режущий край, острие circumference – окружность to feed [fi:d] – подавать longitudinal – продольный horizontal – горизонтальный vertical – вертикальный versatile – универсальный flat – плоский contoured – контурный angle – угол slot – прорезь, паз gear teeth – зубы шестерни drill – дрель, сверло, сверлить hole – отверстие to enlarge – увеличивать thread – резьба portable – портативный unit – единица, целое, узел previously – ранее

to slide – скользить stroke – ход lateral – боковой displacement – смещение straight [streit] – прямой idle ['aidl] – на холостом ходу workshop – цех, мастерская to mount [maunt] – крепить holder – держатель to execute – выполнять simultaneous – одновременный multiple – многочисленный grinder – шлифовальный станок wheel [wi:l] – круг, колесо bonded – скрепленый to remove – удалять pass – проход fine – точный conventional – обычный device – устройство, прибор fragile – хрупкий

Exercise 1. Read and remember the following words and wordcombinations:

milling cutter; toolroom; production line; column; base; overarm; cutting fluid; knee; screw; nut; housing; tank; supply; rectangular; heavy duty operation; rigidity; unit; ensure.

Exercise 2. Give the Russian equivalents of the following English words and phrases:

machine shop; machine types toolroom; machine control; a wide variety of; by hand; by power; hand operated; automatically operated; power feed; metal cutting; to form the metal surface, to cut the metal surface, main casting; hollow base; cutting fluid; upper, lower part; at the proper speed; to hold an overarm; to serve as a housing; to ensure rigidity; column-and knee type milling machine; rotary type milling machine; multi-toothed cutter; to adjust the workplace; to be rectangular in section; to drive the spindle; set of change gears.

Text: Milling Machines Part I Read the text consulting the dictionary, be ready to discuss different types of milling machines

E xample of a CNC vertical milling center

A milling machine is a machine tool used for the shaping of metal and other solid materials. Milling machines exist in two basic forms: horizontal and vertical, which terms refer to the orientation of the cutting tool spindle. Unlike a drill press, in which the workpiece is held stationary and the drill is moved vertically to penetrate the material, milling also involves movement of the workpiece against the rotating cutter, the latter which is able to cut on its flanks as well as its tip. Workpiece and cutter movement are precisely controlled to less than 0.001 inches (.025 millimeters), usually by means of precision ground slides and leadscrews or analogous technology. Milling machines may be manually operated, mechanically automated, or digitally automated via computer numerical control (CNC).

Milling machines can perform a vast number of operations, some very complex, such as slot and keyway cutting, planing, drilling, diesinking, rebating, routing, etc. Cutting fluid is often pumped to the cutting site to cool and lubricate the cut, and to sluice away the resulting swarf.