CNC Cutting Tools and Tooling

Question 1

What is the primary purpose of the rake angle on a cutting tool?

Accepted Answer

To control chip flow and cutting forces

Answer

The rake angle controls how the chip flows away from the cutting edge and directly affects cutting forces and tool life.

Question 2

Which carbide insert designation describes a triangular insert shape?

Accepted Answer

T

Answer

In the ISO insert designation system, 'T' denotes a triangular (equilateral triangle) insert shape with three cutting edges.

Question 3

What is the main advantage of using coated carbide inserts over uncoated ones?

Accepted Answer

Increased hardness and wear resistance at elevated temperatures

Answer

Coatings like TiN, TiAlN, and Al2O3 significantly improve hardness and thermal resistance, extending tool life and allowing higher cutting speeds.

Question 4

In end mill selection, what does the term 'helix angle' refer to?

Accepted Answer

The angle of the flutes relative to the tool axis

Answer

The helix angle is the angle of the flutes (cutting edges) relative to the tool's central axis, affecting chip evacuation and cutting forces.

Question 5

What type of end mill is best suited for cutting aluminum at high speeds?

Accepted Answer

2-flute high-helix end mill

Answer

A 2-flute high-helix end mill provides large flute valleys for superior chip evacuation, which is critical when cutting aluminum at high speeds.

CNC - Cutting Practice Test