How to read a grinding wheel's specification-forturetools

Welcome to forturetools,I'm Brian.Today we are going to talk about"How to read a grinding wheel's specification"

Suppose you have no measuring tools in hand,or you want to know the specification before measuring and testing it.

What shall we do?

Read the label on the grinding wheels.

Usually,there are 3 important informations on the lable.

1,Size:

for example, 1A1 flat wheel, the writing order will be Diameter*Thickness*Hole

2,Formula:

For example, a wheel marked A36-L5-V.

The A refers to the abrasive material which is aluminum oxide.
The 36 represents the grain size.
The L shows the wheel grade or also called degree of hardness, which is medium.
The 5 refers to the structure of the wheel
And the V refers to the bond type.

3, R.P.M
which is the short code of Revolution Per Minute,which indicates maximum speed of the grinding wheel.