Study Guide M: Twist Drills (Square Drills)

Question 1

A TWIST DRILLS OVERALL LENGTH is made of what?

Answer 1

The SHANK the smooth part and the BODY the part with many functions. And sometimes there is a NECK in between between the shank and body.

Question 2

For TWISTS DRILLS, what are the two independent grooves called?

Answer 2

FLUTES

Question 3

What remains after the FLUTES are cut?

Answer 3

The Lands

Question 4

What is a general purpose values angle for the POINT ANGLE and others

Answer 4

118 degrees for general, 60 degrees for PLASTICS, 90 degrees for NON-FERROUS METALS & WOOD, 135 degrees for HARD & TOUGH MATERIALS

Question 5

What is the thin bridge that conects the two LANDS?

Answer 5

WEB

Question 6

At the tip which forms a line, the WEB and POINT ANGLE is

Answer 6

CHISEL EDGE

Question 7

The two straight blades formed at the tip where the FLUTES, LANDS & POINT ANGLE combine are called

Answer 7

LIPS

Question 8

What prevents the body from rubbing on the BORE as cutting is done?

Answer 8

MARGINS