Selection of Grinding Wheels:-

• Selection of proper grinding wheel is necessary to obtain the best results in the grinding work.
• In selectingagrinding wheel following four factors are considered.

1.Material to be ground: for this

a. Abrasive:-Al- oxide is recommended for high tensile strength material and

Si-C for low tensile strength.

b. Grain size:-Fine grain is used for hard material and coarse grain is used for soft material.

c. Grade:-Hard wheel is used for soft material and vice versa.

d. Structure:-Close spacing is required for hard and brittle materials and wide for soft and ductile.

e. Bond:-Majority of wheels are manufactured with vitrified bonds for good results.

1. Area of contact:

   Fine and close grain spacing is useful where the area of contact is small whereas coarse grain and spacing is employed in case of large area.

2. Type of grinding machine:

   Heavy rigidly constructed machines take softer wheels than lighter and flexible types.

3. Wheel speed:

   The higher the wheel speed softer wheel should be used.

4. Work speed:

   The higher the work speed in relation to the wheel speed, the harder wheel should be used.

5. Condition of the grinding m/c:

   Loose bearings and insecure foundations is necessary for the use of harder wheels.

6. Personal factor:

The skill of workman is necessary for selecting the proper wheel.

Specification of Grinding Wheels:-