Cutting edge will be blunt

Cutting edge will not be sharp

Cutting edge will become weak

Cutting edge will not cut material

Drill will break

Drills are over heated

Drill make rough hole

Over sized holes are made

Grade

Grain size

Type of bond

Type of abrasive

Truing

Glazing

Loading

Dressing

Pig iron

Cast iron

Wrought iron

Malleable iron