Characteristics of Tool Material

Question 1

What qualities must a tool posses for efficient cutting? (3)

Answer 1

For efficient cutting a tool must have the following properties:
Hot Hardness
Strength and Resistance to Shock
Low Coefficient of Friction

Question 2

Explain hot hardness

Answer 2

Hot Hardness
This means the ability to retain its hardness at high temperatures. All cutting operations generate heat, which will affect the tool’s hardness and eventually its ability to cut.

Question 3

Explain Strength and Resistance to Shock

Answer 3

Strength and Resistance to Shock
At the start of a cut, the first bite of the tool into the work results in considerable shock loading on the tool. It must obviously be strong enough to withstand it.

Question 4

Explain low coefficient of friction

Answer 4

Low Coefficient of Friction
The tool rubbing against the workpiece and the chip rubbing on the top face of the tool produces heat which must be kept to a minimum.