1. “In pursuit of global competitiveness”
Government College Of Engineering,
Aurangabad.
Turning
Created BY:-
NIKHIL
PAKWANNE
2. TURNING
Turning is the operation to
remove material from the outside
diameter of a workpiece to obtain
a finished surface. The finished
surface may be of continuous
diameter, stepped,tapered or
contoured .
4. Straight Turning
• The work is turned straight when it is
made to rotate about the lathe axis and
tool is fed parallel to the lathe axis.the
straight turning produces a cyllindrical
surface by removing excess metal from
the workpiece.
5. ROUGH TURNING
• The rough turning is the process of
removal of excess material from the
workpiece in a minimum time by applying
high rate of feed and heavy depth of cut.
• The roughing cut should be so made that
the machine, the tool and the workpiece,
can bear the load and it does not make
too rough a surface and spoil the centres.
6. FINISH TURNING
• The finish turning operations requires high
cutting speed, small feed and a very small depth
of cut to generate a smooth surface.
• The finish turning tool having sharp cutting edge
is held on the tool post for this purpose.
• The depth of cut ranges from 0.5-1mm and feed
from 0.1-0.3mmper revolution of the workpiece.
8. SHOULDER TURNING
• When a workpiece having different diameter
is turned, the surface forming the step from
1diameter to other is called shoulder and
the machining this part of workpiece is
called shoulder turning.
• There are four kinds of shoulder:-
3. Square shoulder
4. Angular shoulder
5. Radius shoulder
6. Undercut shoulder
9. Tapers & Taper turning
• A taper may be defined as a uniform
increase or decrease in diameter of a
piece of work measured along its length.
• Taper turning means to produce a conical
surface by gradual reduction in diameter
from cyllindrical workpiece.
• This tappering of a part has wide
application in the construction of
machines.
10. ECCENTRIC TURNING
• It is a cyllindrical workpiece has to
separate axis of rotation. One being out of
centre to the other,the workpiece is turned
eccentric and turning of different surfaces
of the workpieces is known as eccentric
turning.
• Crank shaft turning in lathe
12. Dynamics Of Turning
• The relative forces in a turning operation
are important in the design of machine
tools. The machine tool and its
components must be able to withstand
these forces without causing significant
deflections, vibrations, or chatter during
the operation. There are three principal
forces during a turning process: cutting
force, thrust force and radial force.
13. ADVANTAGES OF TURNING
1. All types of material can be turned.
2. Most versatial machine producing
external and internal circular profiles and
flat surfaces.
3. Low to link cost
4. Large components can be turning.
14. LIMITATIONS OF
TURNING
1. Requires skilled labour
2. Low production rate
3. Close tolerances and find finish
cannot be achieved.
