ME2258 SHEAR ANGLE MEASUREMENT - Computer Programming

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Sunday, March 13, 2011

ME2258 SHEAR ANGLE MEASUREMENT


SHEAR ANGLE MEASUREMENT

AIM :


To measure the shear angle to the given conditions.

TOOLS AND EQUIPMENTS REQUIRED :


Lathe, Single point turning tool, Micrometer.

PROCEDURE :


1.    The workpiece is held in the chuck.

2.    The known depth of cut is given (uncut chip thickness, t1).

3.    The chip is taken for thickness inspection. Find the mean chip thickness, t2.

4.    Calculate the chip thickness ratio, rc = t1 / t2

5.    Calculate the shear angle for the given rake angle of the tool.
                                       rc cosa
tan f =   -----------
             1 - rc sina       where, a - rake angle.

1.    Repeat the same procedure to get few more readings and calculate the mean shear angle.

2.    Repeat the experiment for different depth of cuts.





































NOTE :

1.    The value of Shear angle depends on the cutting conditions, tool geometry, tool material and work material.

2.    If the Shear angle is small, the plane of the shear is large, the chip is thicker, more force is required to remove the chip.

3.    If the shear angle is large, the plane of shear will be shorter and the chip is thin. Hence, less force is required to remove the chip.













CHIP THICKNESS :








LC = Least Count
SL. NO.
DEPTH
PITCH SCALE
HEAD SCALE
HEAD SCALE
CHIP
OF CUT
READING
COINCIDENCE
READING
THICKNESS
 t1  (mm)
(PSR)
(HSC)
HSR = HSC*LC
t2 = PSR + HSR
1
0.25




2
0.25




3
0.25




4
0.25










1
0.50




2
0.50




3
0.50




4
0.50







SHEAR ANGLE :

SL. NO.
UNCUT
CHIP
CHIP
SHEAR ANGLE

CHIP
THICKNESS
THICKNESS

AVERAGE
THICKNESS

RATIO

SHEAR ANGLE
 t1  (mm)
 t2  (mm)
rc = t1 / t2


1
0.25




2
0.25




3
0.25




4
0.25










1
0.50




2
0.50




3
0.50




4
0.50






RESULT :

Thus the shear angle is found for different depth of cuts.


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