SELECTION CRITERIA MOUNTING BALANCING SELF SHARPENING

1. VALLABH BUDHI POLYTECHNIC,
NAVSARI (655)
• Mr. KETAN K.DEVADHARA
• I/C HEAD OF MECHANICAL ENGINEERING DEPARTMENT
In 2005,A Vallabh Budhi Polytechnic has been started in the field of Engineering & Technology
as per guidelines of (AICTE) All India Council for Technical Education, New Delhi and Gujarat
Technological University, Ahmedabad.
9409749547 dec655owner@gtu.edu.i
n
Facebook.com/vbp655
NPPE Campus, Bhanunagar, Eru-Aat Road ,Ta. Jalalpore, Di. Navsari.Pin:396445, Gujarat, India

2. VALLABH BUDHI POLYTECHNIC, NAVSARI (655) MECHANICAL ENGG. DEPT

3. CONTENT
• SELECTION CRITERIA OF GRINDING WHEELS
• MOUNTING OF GRINDING WHEEL
• INSPECTION OF GRINDING WHEEL
• SELF SHARPENING ACTION OF GRINDING WHEEL
VALLABH BUDHI POLYTECHNIC, NAVSARI (655) MECHANICAL ENGG. DEPT

4. SELECTION CRITERIA OF GRINDING WHEELS
• The success of grinding
process is based on wheel
selection.
• The following factors are
considered for selecting a
grinding wheel.
(A) Constant factors
Material of the product
Quantity of metal to be
removed from the
product
Contact area
Type of Grinding Machine
(B) Variable Factors:
Speed of the Grinding
wheel
Speed of the job or
product
Condition of the machine
Personal reasons
VALLABH BUDHI POLYTECHNIC, NAVSARI (655) MECHANICAL ENGG. DEPT

5. MOUNTING OF GRINDING WHEEL
For safe and satisfactory operation of the grinding
wheel, it is necessary to mount the wheel properly
on grinding machine.
VALLABH BUDHI POLYTECHNIC, NAVSARI (655) MECHANICAL ENGG. DEPT

6. INSPECTION OF GRINDING WHEEL
• Visual Inspection: crack & cut off fragment
• Ring (Sound) test: The wheels should be tapped
gently with a light nonmetallic implement, such as
the handle of a screwdriver for light wheels, or a
wooden mallet for heavier wheels. Tap wheels
about 45º each side of the vertical centerline and
about 1 or 2 inches from the periphery as indicated
by the spots in the figures below. Then rotate the
wheel 45º and repeat the test. A sound and
undamaged wheel will give a clear metallic tone. If
cracked, there will be a dead sound and not a clear
“ring.”
VALLABH BUDHI POLYTECHNIC, NAVSARI (655) MECHANICAL ENGG. DEPT

7. • BALANCING OF GRINDING WHEEL :
• Out-of balance and out-of-round wheels result in vibrations and poor surface
finish, faster wheel breakdown and sometimes even cause injury to the operator.
• For balancing, the wheel is mounted at the centre of a perfectly straight and
round spindle, the assembly is then rested on level knife-edge or round bar ways.
VALLABH BUDHI POLYTECHNIC, NAVSARI (655) MECHANICAL ENGG. DEPT

8. SELF SHARPENING ACTION OF GRINDING WHEEL
• The self-sharpening of grinding
wheels means when the abrasive
grains are blunt after grinding,
the grinding force also increases,
the grinding force makes abrasive
particles break or fall off, and
then the new grains comes out,
thus the grinding wheel become
sharp again. This property is
called “self sharpening”.
VALLABH BUDHI POLYTECHNIC, NAVSARI (655) MECHANICAL ENGG. DEPT

9. THANK YOU