Exercise 24. Ask questions and use the words in italics in your answers. The words in brackets will help you. 1.
A modern CNC lathe can do milling (what cutting machine). 2. Lathes
can produce
different shapes of workpieces (what). 3. The turning operations
have been developed
through the years (when). 4. Turning usually uses
simple single-point cutting tools (what kinds of cutting tools). 5.
A lot of chip producing
technological processes are available (how many).
Exercise 25. Read the following dialogue, sum up the information and act out a similar dialogue. CUTTING MACHINE TOOLS A.: Do you know what a cutting machine tool is?
B.: Yes, I do. A cutting tool is any tool that is used to remove material from the
workpiece.
A.: I hope you do know that cutting may be performed by single-point or
multipoint tools. Can you name operations which may be performed by
them?
B.: Single-point tools remove material by means of one cutting edge. Mostly
they are used in turning operations. Milling, drilling, and grinding tools
are often multipoint tools.
A.: You are absolutely right. I wonder which characteristics cutting machine
tools should have to produce quality finished parts.
B.: I am sure that they should have three main characteristics: hardness,
toughness, and wear resistance. The tools must be able to withstand the
heat generated in the metal-cutting process.
A.: It goes without saying. Besides, cutting tools must be made of a materi-
al harder than the material which is to be cut. We should bear in mind that
safety is considered to be the key with the cutting machines because the
removing bits of usually hot metal are travelling at high speeds.
B.: I fully agree with you. The advantage of having a CNC cutting machine is
that it fully protects the machine operator.
A.: Moreover, due to CNC control, modern cutting machines have high pre-
cision of operations and allow achieving excellent results in production.
B.: It seems to me that soon everything will be done by robots.
