Drill and Tap

Which tool cuts internal threads?

• high-speed drill bit
• thread chaser
• drill motor
• tap

A spade bit is the best bit selection to drill a hole in a hollow metal door.

• true
• false

What does the second number in the thread designation signify?

• drill bit diameter
• nominal size
• number of threads per inch
• nominal gauge

Cutting fluid used with taps does all of the following except _____________________.

• sharpen the tap
• cool the material
• improve the cutting action
• reduce friction

The tap should be square to the surface of the metal while tapping the hole.

• true
• false

When tapping a hole, it is not necessary to periodically reverse the tap to clear chips.

• true
• false

A 1/4 - 20 tap requires a(n) _____________________ diameter drill bit?

• 1/4˝
• #7
• 1/8˝
• #20

_____________________ is the recommended bit diameter for the pilot hole of a 10-24 machine screw thread.

• #25
• #7
• 1/8˝
• 1/5"

A tapped hole with _____________________ of full thread is considered normal.

• 10%

• 50%

• 75%

• 90%

Water has enough qualities to be the best form of thread cutting lubricant.

• true
• false