1. Generally, harder wheels should be used to grind ____________________ materials and softer wheels should be used to grind ____________________ materials. 2. What is the abrasive type for each...

1.
Generally, harder wheels should be used to grind ____________________ materials and softer wheels should be used to grind ____________________ materials.

2.
What is the abrasive type for each wheel?

3.
Which wheel is finer?

4.
Which wheel is harder?

5.
Which wheel is more open?