LATHE OPERATIONS - OD1645 - LESSON 1/TASK 1
to cut freely.
Stellite is also used for machining hardened steel, cast
iron, bronze, etc.
(4) Tungsten Carbide.
Tungsten carbide is used to tip cutter bits when
maximum speed and efficiency is required for materials which are difficult
to machine. Although expensive, these cutter bits are highly efficient for
machining cast iron, alloyed cast iron, copper, brass, bronze, aluminum,
Babbitt metal, and such abrasive nonmetallic materials as fiber, hard
rubber, and bakelite. Cutter bits of this type require very rigid support
and are usually held in open-side toolposts. They require special grinding
wheels for sharpening, since tungsten carbide is too hard to be redressed on
ordinary grinding abrasive wheels.
(5) Tantalum Carbide and Titanium Carbide.
These cutting tools are
similar to tungsten carbide tools but are used mostly for machining steel
where extreme heavy cuts are taken and heat and pressure tend to deform the
cutting edge of the other types of cutting tools.
b. Terms And Definitions Applied To Single-Pointed Cutter Bits. The terms
and definitions in subparagraphs (1) through (7) below are applied to tools
used for turning, planing, boring, etc., which have a cutting edge at one
end (figure 11 on the following page). This cutting edge may be formed on
one end of a solid piece of steel, or the cutting part of the tool may
consist of an insert or tip which is held to the body of the tool either by
brazing, welding, or by mechanical means.
(1) Shank.
The shank is the main body of the tool.
(2) Nose.
The nose is the part of the cutter bit which is shaped to
produce the cutting edges.
(3) Face. The face of the cutter bit is the surface at the upper side of
the cutting edge on which the chip strikes as it is separated from the
workpiece.
(4) Side. The side of the cutter bit is the near-vertical surface which,
with the end of the bit, forms the profile of the bit.
The side is the
leading surface of the cutter bit used when cutting stock.
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