CLASSIFICATION OF A GRINDING WHEEL TYPES OF ABRASIVE MATERIALS GRIT GRADE STRUCTURE TYPES OF BONDING MATERIALS NOMENCLATURE OF A GRINDING WHEEL AS PER IS

1. Mr. Ketan K. Devadhara
Mechanical Engineering
DepartmentIn 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.
VALLABH BUDHI POLYTECHNIC, NAVSARI-655
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CIVIL
Engineering
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Engineering
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LEngineering
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ALEngineering
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NPPE Campus, Bhanunagar, Eru-Aat Road ,Ta. Jalalpore, Di. Navsari.Pin:396445, Gujarat, India
I/c Head of Department

2. V.B.POLYTECHNIC, NAVSARI. (655) MECHANICAL ENGG. DEPARTMENT

3. V.B.POLYTECHNIC, NAVSARI. (655) MECHANICAL ENGG. DEPARTMENT
 CLASSIFICATION OF A GRINDING WHEEL
 TYPES OF ABRASIVE MATERIALS
 GRIT
 GRADE
 STRUCTURE
 TYPES OF BONDING MATERIALS
 NOMENCLATURE OF A GRINDING WHEEL AS PER IS

4. V.B.POLYTECHNIC, NAVSARI. (655) MECHANICAL ENGG. DEPARTMENT
ACCORDING TO
BONDING
MATERIAL
• VITRIFIED BOND (V)
• SILICATE BOND (S)… Etc.
GRADE
OF WHEEL
• SOFT GRADE WHEEL
• HARD GRADE WHEEL
STRUCTURE
• OPEN STRUCTURE WHEEL
• CLOSED STRUCTURE WHEEL
SHAPE
OF WHEEL
• CONTINUE….

5. V.B.POLYTECHNIC, NAVSARI. (655) MECHANICAL ENGG. DEPARTMENT

6. V.B.POLYTECHNIC, NAVSARI. (655) MECHANICAL ENGG. DEPARTMENT
 Silicon carbide (Sic)
 Aluminum oxide (Al2O3)
 Boron Nitride (BNO3)
 Cubic Boron Nitride (CBN)
 Diamond

7. V.B.POLYTECHNIC, NAVSARI. (655) MECHANICAL ENGG. DEPARTMENT
Grits: The grain or grit number indicates in a general way the size of the abrasive grains used
in making a wheel, or the size of the cutting teeth, since grinding is a true cutting operation.
Grain size is denoted by a number indicating the number of meshes per liner inch (25.4 mm)
of the screen through which the grains pass when they are graded after crushing.
The following list ranging from very coarse to very fine includes all the ordinary grain sizes
commonly used in the manufacture of grinding wheels.

8. V.B.POLYTECHNIC, NAVSARI. (655) MECHANICAL ENGG. DEPARTMENT
WHEEL GRADE: The term grade as applied to a grinding wheel refers to the tenacity with
which the bond holds the abrasive grains in place, and does not refer to the hardness of the
abrasive. A wheel from which the grains are released rapidly during the grinding operation is
called soft grade, whereas wheel that retains the grains more securely is called hard grade.

9. V.B.POLYTECHNIC, NAVSARI. (655) MECHANICAL ENGG. DEPARTMENT
STRUCTURE: Abrasive grains are not packed tightly in the wheel but are disturbed
Through the bond.
The primary purpose of structure is to provide clearance of chip and it may be open or
dense.
The structure commonly used is denoted by numbers as follows.

10. V.B.POLYTECHNIC, NAVSARI. (655) MECHANICAL ENGG. DEPARTMENT
(a) Vitrified bond (V)
(b) Silicate bond (S)
(c) Oxychloride bond (O)
(d) Resinoid bond (B)
(e) Shellac bond (E)
(f) Rubber bond (R)

11. V.B.POLYTECHNIC, NAVSARI. (655) MECHANICAL ENGG. DEPARTMENT

12. V.B.POLYTECHNIC, NAVSARI. (655) MECHANICAL ENGG. DEPARTMENT