Question

Which of the following statements are correct with respect to grinding?

• A. 1, 2 and 3
• B. 2, 3 & 4
• C. 1, 3 & 4
• D. 1, 2, 3 & 4

Answer 1

The correct option is B 2, 3 & 4

$\text{Grain size (or) Grit size:}$
$10-24\to$ Coarse grains
$30-60\to$ medium grain
$80-180\to$ fine grains
$200-600\to$ very fine grains
$\text{Grain size:}$
$a=\frac{1}{GSN}$ inches
Where GSN = Grain Size Number
$\frac{1}{GSN}$ Inches is the size of side of cubical or square cross section particle

• With grain size increased the material removal rate is increasing first then reducing.
• The grain size is selected based on the surface finish required on the work piece, i.e., for rough grinding coarse or medium grain size is selected and for super finish, fine or very fine grain size is selected