Turning
Turning is the most important machining process and
can produce a wide variety of parts. Primarily, turning
is used to produce parts Cylindrical in shape by a Single
point cutting tool on Lathes.
Engine Lathe
CNC Lathe Machine
10/15/2016 17
1. Straight turning
Lathe operations
Straight turning is used to reduce the
diameter of a part to a desired dimension
10/15/2016 18
2. Facing
Tool is fed radially inward
Facing is done to create a smooth, flat face perpendicular to the axis of
a cylindrical part. The tool is fed radially or axially to create a flat
machined surface
10/15/2016 19
3. Parting (Cutoff)
Tool is fed radially
into rotating work at
some location to cut
off end of part, or
provide a groove
Figure 22.6 (f) cutoff
The separation of a part from a larger piece of stock by
means of a parting tool.
10/15/2016 20
4. Grooving
Tool is fed radially
into rotating work at
some location to cut
off end of part, or
provide a groove
Figure 22.6 (f) cutoff
To produce recesses and shoulders
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IENG 475: Computer-Controlled
Manufacturing Systems 21
5. Face grooving
Instead of feeding the
tool parallel to the axis of
rotation, tool follows a
contour that is not
necessarily straight (thus
creating a contoured
form).
10/15/2016
IENG 475: Computer-Controlled
Manufacturing Systems 22
6. Chamfering
Cutting edge cuts
an angle on the
corner of the
cylinder, forming a
"chamfer"
To remove sharp edges
10/15/2016
IENG 475: Computer-Controlled
Manufacturing Systems 23
7. Threading
Pointed form tool is
fed linearly across
surface of rotating
workpart parallel to
axis of rotation at a
large feed rate, thus
creating threads
Figure 22.6 (g) threading
is possible in lathe by advancing the cutting tool at a feed exactly
equal to the thread pitch. The single-point cutting tool cuts in a helical
band, which is actually a thread.
24
Thread can be both external and internal types. Internal threads are
obtained by using tapping tools mounted in the tailstock.
10/15/2016
IENG 475: Computer-Controlled
Manufacturing Systems 25
8. Contour Turning
Instead of feeding the
tool parallel to the axis of
rotation, tool follows a
contour that is not
necessarily straight (thus
creating a contoured
form).
uses a single-point cutting tool to reproduce a surface
contour from a template.
10/15/2016
IENG 475: Computer-Controlled
Manufacturing Systems 26
9. Knurling
Instead of feeding the
tool parallel to the axis of
rotation, tool follows a
contour that is not
necessarily straight (thus
creating a contoured
This is not a machining operation. Does not involve form). a cutting
operation. It is a metal forming operation used to produce a
regular cross-hatched pattern in the work surface.
10/15/2016
IENG 475: Computer-Controlled
Manufacturing Systems 27
10.Drilling
Instead of feeding the
tool parallel to the axis of
rotation, tool follows a
contour that is not
necessarily straight (thus
creating a contoured
form).
Feeding the drill into the rotating work along its axis.
10/15/2016
IENG 475: Computer-Controlled
Manufacturing Systems 28
11. Internal grooving
Instead of feeding the
tool parallel to the axis of
rotation, tool follows a
contour that is not
necessarily straight (thus
creating a contoured
form).
10/15/2016
IENG 475: Computer-Controlled
Manufacturing Systems
Taper turning
Pointed form tool is
fed linearly across
surface of rotating
workpart parallel to
axis of rotation at a
large feed rate, thus
creating threads
Figure 22.6 (g) threading
A uniform increase or decrease in the size or diameter of a
work piece
Turning is the most important machining process and
can produce a wide variety of parts. Primarily, turning
is used to produce parts Cylindrical in shape by a Single
point cutting tool on Lathes.
Engine Lathe
CNC Lathe Machine
10/15/2016 17
1. Straight turning
Lathe operations
Straight turning is used to reduce the
diameter of a part to a desired dimension
10/15/2016 18
2. Facing
Tool is fed radially inward
Facing is done to create a smooth, flat face perpendicular to the axis of
a cylindrical part. The tool is fed radially or axially to create a flat
machined surface
10/15/2016 19
3. Parting (Cutoff)
Tool is fed radially
into rotating work at
some location to cut
off end of part, or
provide a groove
Figure 22.6 (f) cutoff
The separation of a part from a larger piece of stock by
means of a parting tool.
10/15/2016 20
4. Grooving
Tool is fed radially
into rotating work at
some location to cut
off end of part, or
provide a groove
Figure 22.6 (f) cutoff
To produce recesses and shoulders
10/15/2016
IENG 475: Computer-Controlled
Manufacturing Systems 21
5. Face grooving
Instead of feeding the
tool parallel to the axis of
rotation, tool follows a
contour that is not
necessarily straight (thus
creating a contoured
form).
10/15/2016
IENG 475: Computer-Controlled
Manufacturing Systems 22
6. Chamfering
Cutting edge cuts
an angle on the
corner of the
cylinder, forming a
"chamfer"
To remove sharp edges
10/15/2016
IENG 475: Computer-Controlled
Manufacturing Systems 23
7. Threading
Pointed form tool is
fed linearly across
surface of rotating
workpart parallel to
axis of rotation at a
large feed rate, thus
creating threads
Figure 22.6 (g) threading
is possible in lathe by advancing the cutting tool at a feed exactly
equal to the thread pitch. The single-point cutting tool cuts in a helical
band, which is actually a thread.
24
Thread can be both external and internal types. Internal threads are
obtained by using tapping tools mounted in the tailstock.
10/15/2016
IENG 475: Computer-Controlled
Manufacturing Systems 25
8. Contour Turning
Instead of feeding the
tool parallel to the axis of
rotation, tool follows a
contour that is not
necessarily straight (thus
creating a contoured
form).
uses a single-point cutting tool to reproduce a surface
contour from a template.
10/15/2016
IENG 475: Computer-Controlled
Manufacturing Systems 26
9. Knurling
Instead of feeding the
tool parallel to the axis of
rotation, tool follows a
contour that is not
necessarily straight (thus
creating a contoured
This is not a machining operation. Does not involve form). a cutting
operation. It is a metal forming operation used to produce a
regular cross-hatched pattern in the work surface.
10/15/2016
IENG 475: Computer-Controlled
Manufacturing Systems 27
10.Drilling
Instead of feeding the
tool parallel to the axis of
rotation, tool follows a
contour that is not
necessarily straight (thus
creating a contoured
form).
Feeding the drill into the rotating work along its axis.
10/15/2016
IENG 475: Computer-Controlled
Manufacturing Systems 28
11. Internal grooving
Instead of feeding the
tool parallel to the axis of
rotation, tool follows a
contour that is not
necessarily straight (thus
creating a contoured
form).
10/15/2016
IENG 475: Computer-Controlled
Manufacturing Systems
Taper turning
Pointed form tool is
fed linearly across
surface of rotating
workpart parallel to
axis of rotation at a
large feed rate, thus
creating threads
Figure 22.6 (g) threading
A uniform increase or decrease in the size or diameter of a
work piece
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