Рабочий лист по теме "Machine tools" для профессий 23.01.17 Мастер по ремонту и обслуживанию автомобилей и специальности 23.02.07 Техническое обслуживание и ремонт двигателей, систем и агрегатов автомобилей

September, 17^th

Classwork

MACHINE TOOLS (write down the topic)

1. Read and translate the texts.

MACHINE-TOOLS

Metal undergoes a number of processes before it is formed into the required shape: casting, rolling, welding, piercing, trimming, spinning, bending, drawing, etc.

The machines which perform all these kinds of works are called machine-tools. The most common machine-tool found in almost any workshop is the lathe. The main parts of it are: the headstock, the chuck, the tailstock, the carriage.

The automatic lathe is a perfection of the ordinary lathe. Its tools are changed automatically. A worker skilled in the use of a lathe is called a turner.

There are many other machine-tools that work on plane surfaces, for example, milling machines, planning and shaping machines. Circular holes are drilled by a drilling machine or bored by a boring machine or a boring mill. Thread milling machines are used in the production of different machine elements. Gear cutting machines include gear milling machines. All these machines use cutting tools made of high-speed steel.

LATHES

There are three types of lathes produced by our machine-tool manufacturing works: heavy, medium and light types. The type of a lathe depends upon the size of diameter of work pieces.

A most convenient and efficient machine is the model combination lathe for turning, milling, drilling, grinding, slotting, and tool-sharpening jobs. It can be used both in stationary and mobile repair shops, on ships, etc.

DRILLING MACHINES

The most drilling machines are equipped with mechanisms, permitting not only drilling, countersinking and reaming, but also cutting female threads with the help of taps. Both universal and special-purpose type radial "drills are built.

1. Answer the questions in writing.

• What processes does metal undergo before it is formed into the required shape?

• How are the machines which perform this work called?

• What is the most common machine-tool in any workshop?

• What are the main parts of a lathe?

• What is the automatic lathe?

• How do we call a worker, skilled in the use of a lathe?

• What machine-tools that works on plane surfaces, do you know?

• What do the drilling machines drill?

• Where are the threads milling machines used?

• What are the main types of lathes?

• What is the most convenient and efficient machine?

• What are the most drilling machines equipped with