ME2258 SHEAR ANGLE MEASUREMENT - Computer Programming

# Computer Programming

C C++ Java Python Perl Programs Examples with Output -useful for Schools & College Students

## Sunday, March 13, 2011

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.