4BE3 U5 C1 Obj 2 EMH

Podcast Beta

Play an AI-generated podcast conversation about this lesson

Questions and Answers

EASY What percentage of a full thread do most taps create?

90%

50%

100%

75% (correct)

How can you quickly calculate the tap drill size if a chart is not available?

Multiply the pitch of the thread with the nominal diameter of the thread

Add the pitch of the thread to the nominal diameter of the thread

Divide the pitch of the thread by the nominal diameter of the thread

Subtract the pitch of the thread from the nominal diameter of the thread (correct)

What should you apply to the tap before starting to thread?

Paint

Cutting fluid (correct)

Lubricant

Coolant

How should you press down on the tap wrench?

Equally to both sides Signup and view all the answers

What type of die is used to recut battered threads and clean rusted threads?

Solid die Signup and view all the answers

What is the main advantage of an adjustable die?

It provides a relatively wide range of thread fits Signup and view all the answers

What is used to guide the dies when threading?

Threaded plate Signup and view all the answers

What should you do when assembling the dies?

Make sure they are matched up correctly Signup and view all the answers

What is the primary function of hand threading tools?

To cut connection threads in pipe and fittings Signup and view all the answers

What is the purpose of the channels or flutes on a tap?

To provide space for removal of chips and admit cutting fluid to the cutting edges Signup and view all the answers

What is the typical shape of the opposite end of a tap?

Square Signup and view all the answers

What is the purpose of a plug tap?

To tap through a workpiece and for general use Signup and view all the answers

What does the letter M in a tap marking indicate?

Metric thread Signup and view all the answers

What is the purpose of a tap drill?

To drill a hole to the correct size for tapping Signup and view all the answers

What percentage of thread engagement provides no significant increase in clamping strength?

More than 60% Signup and view all the answers

What is the purpose of a bottoming tap?

To finish threads to full size Signup and view all the answers

MEDIUM What is the primary function of a taper tap?

To start a thread easily Signup and view all the answers

What is the purpose of the flutes on a tap?

All of the above Signup and view all the answers

What is the ISO Standard Metric Thread series?

A series of 25 thread sizes ranging from 1.6 mm to 100 mm diameter Signup and view all the answers

What is the correct size of the tap drill relative to the tap?

The tap drill is always smaller than the tap Signup and view all the answers

What is the purpose of a hand tap set?

To cut both internal and external threads Signup and view all the answers

What is the marking on a tap indicating a metric thread?

The letter M followed by the thread diameter and pitch in millimeters Signup and view all the answers

What type of tap is used to finish threads to full size?

Bottoming tap Signup and view all the answers

What is the purpose of using a tap drill before tapping?

To leave the correct amount of material in the hole for the tap to produce a full thread depth Signup and view all the answers

What is the primary purpose of creating threads that are 75% of a full thread?

To make the threads easier to cut Signup and view all the answers

How is the tap drill size typically selected?

By referring to a chart Signup and view all the answers

What is the correct sequence of steps when tapping holes by hand?

Select the correct tap, apply cutting fluid, start the tap, and turn clockwise Signup and view all the answers

What is the purpose of the set screw in a round split die?

To spread the jaws of the die Signup and view all the answers

What is the advantage of using an adjustable die?

It provides a relatively wide range of thread fits Signup and view all the answers

What is the purpose of the tapered side of the die half in an adjustable die?

To permit easy starting of the die Signup and view all the answers

Why is it important to match the die halves when assembling the dies?

To avoid damage to the dies Signup and view all the answers

What is the purpose of the die stock?

To hold the die in place Signup and view all the answers

MEDIUM What is the purpose of applying a suitable cutting fluid to the tap?

To facilitate cutting and reduce the risk of breaking the tap Signup and view all the answers

Why is it important to start the tap squarely with the hole?

To prevent the tap from breaking during threading Signup and view all the answers

What is the primary advantage of using an adjustable die?

It provides a relatively wide range of thread fits Signup and view all the answers

What is the purpose of the tapered side of the die half in an adjustable die?

To facilitate easy starting of the die Signup and view all the answers

What is the purpose of using a tap drill before tapping?

To create a hole for the tap to start in Signup and view all the answers

Why is it important to match the die halves when assembling the dies?

To reduce the risk of damage to the dies Signup and view all the answers

What is the purpose of the set screw in a round split die?

To permit a certain amount of adjustment Signup and view all the answers

What is the primary function of hand tapping tools?

To create threads that are 75% of a full thread Signup and view all the answers

What is the primary function of the taper tap in a hand tap set?

To start a thread easily and tap a hole that goes through the workpiece Signup and view all the answers

What is the purpose of the channels or flutes on a tap?

To provide space for removal of chips and admit cutting fluid to the cutting edges Signup and view all the answers

What is the significance of the ISO Standard Metric Thread series?

It has 25 thread sizes ranging from 1.6 mm to 100 mm diameter Signup and view all the answers

What is the correct sequence of steps when tapping holes by hand?

Drill the hole, tap with a taper tap, tap with a plug tap, tap with a bottoming tap Signup and view all the answers

What is the purpose of using a tap drill before tapping?

To leave the correct amount of material in the hole so the tap can cut a thread Signup and view all the answers

What is the marking on a tap indicating a metric thread?

M followed by the nominal diameter of the thread in millimetres Signup and view all the answers

What is the advantage of using a hand tap set?

It provides flexibility in tapping different sizes of threads Signup and view all the answers

What is the significance of more than 60% thread engagement?

It provides no significant increase in clamping strength Signup and view all the answers

HARD What is the main purpose of the channels or flutes on a tap?

To provide space for removal of chips and admit cutting fluid to the cutting edges Signup and view all the answers

What is the purpose of the taper tap in a hand tap set?

To start a thread easily and for tapping a hole that goes through the workpiece Signup and view all the answers

What is the significance of the ISO Standard Metric Thread series?

It provides a standard for cutting both internal and external metric threads Signup and view all the answers

Why is it important to use a tap drill before tapping?

To leave sufficient material in the hole for the tap to produce 75% of a full thread depth Signup and view all the answers

What is the purpose of the bottoming tap in a hand tap set?

To finish threads to full size after they have been started with a taper or plug tap Signup and view all the answers

What is the significance of more than 60% thread engagement?

It provides no significant increase in clamping strength Signup and view all the answers

What is the purpose of the square end of a tap?

To receive the tap wrench Signup and view all the answers

What is the purpose of a hand tap set?

To provide a set of taps for different thread sizes and types Signup and view all the answers

What is the primary purpose of using a tap drill that is 75% of the nominal diameter of the thread?

To reduce the risk of the tap breaking during threading Signup and view all the answers

What is the primary advantage of using an adjustable die over a solid die or round split die?

It provides a relatively wide range of thread fits Signup and view all the answers

What is the purpose of turning the tap clockwise one-quarter turn and then turning backward when tapping holes by hand?

To break the chip and allow cutting fluid to cover the cutting edges Signup and view all the answers

What is the primary function of the set screw in a round split die?

To spread the jaws of the die when tightened Signup and view all the answers

What is the purpose of the tapered side of the die half in an adjustable die?

To permit easy starting of the die Signup and view all the answers

What is the primary purpose of using a suitable cutting fluid when tapping holes by hand?

To reduce friction and heat generation during threading Signup and view all the answers

What is the primary purpose of checking the tap with a set square at two positions when tapping holes by hand?

To ensure the tap is perpendicular to the work surface Signup and view all the answers

What is the primary purpose of using a die stock when using a threading die?

To guide the die when threading Signup and view all the answers

Study Notes

Hand Threading Tools

Hand threading tools are used to cut connection threads in pipe and fittings, both internally and externally.

Taps

Taps are cutting tools designed to cut internal (female) threads.
The threaded end of a tap has channels or flutes, which are cut lengthwise across the threads to form cutting edges, provide space for removal of chips, and admit cutting fluid to the cutting edges.
The opposite end of a tap is usually square for receiving the tap wrench.
Hand taps are usually made in sets of three: plug, taper, and bottoming taps.
Plug taps are used for tapping through a workpiece and for general use.
Taper taps are used to start a thread easily, for tapping a hole which goes through the workpiece, or for starting a blind hole.
Bottoming taps are used to finish threads to full size after they have been started with a taper or plug tap.

International Standards Organization (ISO) Standard Metric Thread

The ISO Standard Metric Thread has 25 thread sizes ranging from 1.6 mm to 100 mm diameter.
Taps are identified with the letter M followed by the nominal diameter of the thread in millimeters times the pitch in millimeters.
Example: M4 × 0.7 indicates a metric thread with a nominal diameter of 4 mm and a pitch of 0.7 mm.

Tap Drill Size

Before a tap is used, the hole must be drilled to the correct size using a tap drill.
The correct drill bit will leave the correct amount of material in the hole so the tap can cut a thread.
The tap drill is always smaller than the tap to leave sufficient material for the tap to produce 75% of a full thread depth.
Tap drill size can be calculated by subtracting the pitch of the thread from the nominal diameter of the thread.

Tapping Holes by Hand

Steps to tap a hole by hand:
- Select the correct tap and tap wrench for the job.
- Apply a suitable cutting fluid to the tap (except for brass or cast iron).
- Start the tap square with the hole.
- Press down on the wrench equally to both sides and turn clockwise (right-hand thread) for approximately two turns.
- Remove the tap wrench and check the tap at two positions to ensure it is perpendicular to the work surface.
- If the tap is not square, back it out and start again.

Threading Dies

Threading dies are used to cut external male threads on round workpieces.
There are three types of threading dies: solid, round split, and adjustable.
Solid dies are used to recut battered threads and clean rusted or otherwise clogged threads.
Round split dies have a set screw that permits a certain amount of adjustment.
Adjustable dies provide a relatively wide range of thread fits and are the most efficient.

Hand Threading Tools

Hand threading tools are used to cut connection threads in pipe and fittings, both internally and externally.

Taps

Taps are cutting tools designed to cut internal (female) threads.
The threaded end of a tap has channels or flutes, which are cut lengthwise across the threads to form cutting edges, provide space for removal of chips, and admit cutting fluid to the cutting edges.
The opposite end of a tap is usually square for receiving the tap wrench.
Hand taps are usually made in sets of three: plug, taper, and bottoming taps.
Plug taps are used for tapping through a workpiece and for general use.
Taper taps are used to start a thread easily, for tapping a hole which goes through the workpiece, or for starting a blind hole.
Bottoming taps are used to finish threads to full size after they have been started with a taper or plug tap.

International Standards Organization (ISO) Standard Metric Thread

The ISO Standard Metric Thread has 25 thread sizes ranging from 1.6 mm to 100 mm diameter.
Taps are identified with the letter M followed by the nominal diameter of the thread in millimeters times the pitch in millimeters.
Example: M4 × 0.7 indicates a metric thread with a nominal diameter of 4 mm and a pitch of 0.7 mm.

Tap Drill Size

Before a tap is used, the hole must be drilled to the correct size using a tap drill.
The correct drill bit will leave the correct amount of material in the hole so the tap can cut a thread.
The tap drill is always smaller than the tap to leave sufficient material for the tap to produce 75% of a full thread depth.
Tap drill size can be calculated by subtracting the pitch of the thread from the nominal diameter of the thread.

Tapping Holes by Hand

Steps to tap a hole by hand:
- Select the correct tap and tap wrench for the job.
- Apply a suitable cutting fluid to the tap (except for brass or cast iron).
- Start the tap square with the hole.
- Press down on the wrench equally to both sides and turn clockwise (right-hand thread) for approximately two turns.
- Remove the tap wrench and check the tap at two positions to ensure it is perpendicular to the work surface.
- If the tap is not square, back it out and start again.

Threading Dies

Threading dies are used to cut external male threads on round workpieces.
There are three types of threading dies: solid, round split, and adjustable.
Solid dies are used to recut battered threads and clean rusted or otherwise clogged threads.
Round split dies have a set screw that permits a certain amount of adjustment.
Adjustable dies provide a relatively wide range of thread fits and are the most efficient.

Hand Threading Tools

Hand threading tools are used to cut connection threads in pipe and fittings, both internally and externally.

Taps

Taps are cutting tools designed to cut internal (female) threads.
The threaded end of a tap has channels or flutes, which are cut lengthwise across the threads to form cutting edges, provide space for removal of chips, and admit cutting fluid to the cutting edges.
The opposite end of a tap is usually square for receiving the tap wrench.
Hand taps are usually made in sets of three: plug, taper, and bottoming taps.
Plug taps are used for tapping through a workpiece and for general use.
Taper taps are used to start a thread easily, for tapping a hole which goes through the workpiece, or for starting a blind hole.
Bottoming taps are used to finish threads to full size after they have been started with a taper or plug tap.

International Standards Organization (ISO) Standard Metric Thread

The ISO Standard Metric Thread has 25 thread sizes ranging from 1.6 mm to 100 mm diameter.
Taps are identified with the letter M followed by the nominal diameter of the thread in millimeters times the pitch in millimeters.
Example: M4 × 0.7 indicates a metric thread with a nominal diameter of 4 mm and a pitch of 0.7 mm.

Tap Drill Size

Before a tap is used, the hole must be drilled to the correct size using a tap drill.
The correct drill bit will leave the correct amount of material in the hole so the tap can cut a thread.
The tap drill is always smaller than the tap to leave sufficient material for the tap to produce 75% of a full thread depth.
Tap drill size can be calculated by subtracting the pitch of the thread from the nominal diameter of the thread.

Tapping Holes by Hand

Steps to tap a hole by hand:
- Select the correct tap and tap wrench for the job.
- Apply a suitable cutting fluid to the tap (except for brass or cast iron).
- Start the tap square with the hole.
- Press down on the wrench equally to both sides and turn clockwise (right-hand thread) for approximately two turns.
- Remove the tap wrench and check the tap at two positions to ensure it is perpendicular to the work surface.
- If the tap is not square, back it out and start again.

Threading Dies

Threading dies are used to cut external male threads on round workpieces.
There are three types of threading dies: solid, round split, and adjustable.
Solid dies are used to recut battered threads and clean rusted or otherwise clogged threads.
Round split dies have a set screw that permits a certain amount of adjustment.
Adjustable dies provide a relatively wide range of thread fits and are the most efficient.

Hand Threading Tools

Hand threading tools are used to cut connection threads in pipe and fittings, both internally and externally.

Taps

Taps are cutting tools designed to cut internal (female) threads.
The threaded end of a tap has channels or flutes, which are cut lengthwise across the threads to form cutting edges, provide space for removal of chips, and admit cutting fluid to the cutting edges.
The opposite end of a tap is usually square for receiving the tap wrench.
Hand taps are usually made in sets of three: plug, taper, and bottoming taps.
Plug taps are used for tapping through a workpiece and for general use.
Taper taps are used to start a thread easily, for tapping a hole which goes through the workpiece, or for starting a blind hole.
Bottoming taps are used to finish threads to full size after they have been started with a taper or plug tap.

International Standards Organization (ISO) Standard Metric Thread

The ISO Standard Metric Thread has 25 thread sizes ranging from 1.6 mm to 100 mm diameter.
Taps are identified with the letter M followed by the nominal diameter of the thread in millimeters times the pitch in millimeters.
Example: M4 × 0.7 indicates a metric thread with a nominal diameter of 4 mm and a pitch of 0.7 mm.

Tap Drill Size

Before a tap is used, the hole must be drilled to the correct size using a tap drill.
The correct drill bit will leave the correct amount of material in the hole so the tap can cut a thread.
The tap drill is always smaller than the tap to leave sufficient material for the tap to produce 75% of a full thread depth.
Tap drill size can be calculated by subtracting the pitch of the thread from the nominal diameter of the thread.

Tapping Holes by Hand

Steps to tap a hole by hand:
- Select the correct tap and tap wrench for the job.
- Apply a suitable cutting fluid to the tap (except for brass or cast iron).
- Start the tap square with the hole.
- Press down on the wrench equally to both sides and turn clockwise (right-hand thread) for approximately two turns.
- Remove the tap wrench and check the tap at two positions to ensure it is perpendicular to the work surface.
- If the tap is not square, back it out and start again.

Threading Dies

Threading dies are used to cut external male threads on round workpieces.
There are three types of threading dies: solid, round split, and adjustable.
Solid dies are used to recut battered threads and clean rusted or otherwise clogged threads.
Round split dies have a set screw that permits a certain amount of adjustment.
Adjustable dies provide a relatively wide range of thread fits and are the most efficient.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Description

This quiz covers the basics of hand threading tools and taps, including their uses and functionality in cutting internal and external threads in pipes and fittings.