The range of the helix angle of the twist drill is ________Question 5Select one:a.> 0 and < 90b.0-180c.> 90 and < 180d.> 180e.90-180

To determine the range of the helix angle of a twist drill, we can analyze the characteristics of twist drills:

1. Helix Angle Definition: The helix angle of a twist drill is the angle between the helix of the flute and the axis of the drill.

2. Helix Angle Values: Typical helix angles for twist drills generally range between 0° and 30°, which corresponds to a range of greater than 0 and less than 90 degrees.

3. Functionality: A smaller helix angle (like 0° to 15°) provides high feed rates and low cutting forces, while larger helix angles (up to about 30°) are used for softer materials to enhance chip removal.

Thus, we can conclude that the correct option for the helix angle of twist drills is:

Final Answer

a. > 0 and < 90