Mechanical Engineering: Screw Threads and Tapping

Tapping is the cutting of thread grooves in the workpiece using a multi cutting-edged tool with a particular cutting edge shape called a ______.

The most commonly used thread is the ______-thread, which is used for all types of bolts, nuts, and screws.

During tapping, one of the motions involved is rotary motion of the tap, while the other is ______ motion in the workpiece.

Proper ______ must be applied during the cutting operation to ensure smoother surfaces and increased tool life.

The tap type with two rings on the shank is known as a ______ tap.

Screw Threads

Screw threads can be used for fastening or transmitting motion.
The most common type of thread is the V-thread, used for bolts, nuts, and screws.
The V-thread has a 60° angle between the flanks.

Tapping

Tapping is the process of cutting thread grooves in a workpiece using a multi-edged tool
The tool is rotated by hand along its longitudinal axis.

Tapping Types

There are three types of taps: taper, plug, and bottoming.

Taper tap

Has one ring on the shank.
The taper tap starts the thread and can be used for threads that are not fully tapped.

Plug tap

Has two rings on the shank.
The plug tap is used for threads that have been started by a taper tap.

Bottoming tap

Has no rings on the shank.
The bottoming tap reaches the full depth of the thread.

Tapping Procedure

Drilling a pilot hole.
Countersinking (if necessary).
Tapering the thread.
Plugging the thread.
Bottoming the thread.

Tapping Technique

The main motion of the tap is rotary.
The feed motion of the tap is axial.
It is important to check the squareness of the tap to the workpiece.

Cutting Fluids

Cutting fluids are important for tapping.
They help improve the smoothness and surface finish of the thread, increase tap life, remove chips, decrease tap breakage, and improve thread quality.

Explore the essentials of screw threads and the tapping process in mechanical engineering. This quiz covers types of taps, their purposes, and the tapping procedure required for creating effective threads. Perfect for students and professionals looking to enhance their knowledge of fastening techniques.