Thread Cutting

Machine screw sizes range from ___ to ___

0 to 12

Explain what 1/2 -13 NC means?

1/2 Diameter 13 Threads per inch NC National Corse

12-28 Thread Size

16 Drill Size

3/8-16 Thread Size

5/16 Drill Size

10-32 Thread Size

5/32 Drill Size

1/4-20 Thread Size

9 Drill Size

Threads are used for 3 purposes

Attaching parts, adjustments, and transmit motion

What do you use to thread the bottom of a blind hole

Bottoming tap

The cutting tool used for external threads?

Die

The tool used to hold a die is called a?

Die stock

Name two functions of the flutes

Lubricate it Room for the chip

Thread sizes smaller than 1/4" are not measured by fractions but by

Machine Screws

NC

National Course

NF

National Fine

NPT

National Pipe Thread

Pickles Radish Peanut Mango Matt Cake Haley

PITCH DIAMETER ROOT PITCH MINOR DIAMETER MAJOR DIAMETER CREST HELIX ANGLE

The distance between the center of one thread to the center of the next thread is called __________

Pitch

Why do you grind a chamfer on the end of a shaft to be threaded

So its easier to start

The cutting tool used for internal threads?

Tap

The drill used for cutting threads is a?

Tap Drill

The tool used to hold the tap is a?

Tap wrench

When starting to cut threads you use a ____________ tap.

Tapper tap

Name three types of taps

Tapper tap Bottoming tap Plug tap

You will only need a tapped tap when

Unlimited Clearance

7/16-20 Thread Size

W Drill Size