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