.

Question 1

process of
producing threads in a metal.

Answer 1

tapping

Question 2

spiral or helical ridge
found on nuts and bolts.
Thread is specified by the diameter
and the pitch

Answer 2

thread

Question 3

most common types of taps and a cutting tools
used to create internal threads (female threads) in a hole
manually, usually with a tap wrench. They are commonly used in
repair work, low-volume production, or situations where
precision and control are needed but machine tapping is not

Answer 3

hand taps

Question 4

A bottoming tap has almost no taper at the end
because it is designed to thread all the way to the
bottom of its reach. Only 1 to 1.5 threads will be
tapered.

Answer 4

bottoming tap

Question 5

are in between Bottoming and Taper Taps
because they have 3-5 threads tapered, which is
more than a Bottoming Tap and less than a Taper

Answer 5

plug tap

Question 6

has almost no taper at the end
because it is designed to thread all the way to the
bottom of its reach. Only 1 to 1.5 threads will be
tapered.

Answer 6

bottoming tap

Question 7

has quite a lot of taper to help it ease
into cutting threads gradually. Typically, the first 8
to 10 threads are tapered. Taper Taps are the most
common types of taps and are typically what you’ll
have in a Tap and Die Set.

Answer 7

taper tap

Question 8

are taps designed to cut threads using power-
driven equipment such as CNC machines, drill presses, or
tapping machines. They are built to handle higher speeds,
greater forces, and continuous operation. Power taps often
feature stronger materials, optimized flute designs, and tighter
tolerances to ensure smooth, accurate, and efficient threading
in production environments. They enable faster cycle times,
improved thread quality, and longer tool life compared to hand
taps, making them ideal for high-volume or automated
manufacturing processes.

Answer 8

power tap

Question 9

• these taps have spiral cutting edges with relief grooves, offering better chip
  ejection and cutting performance than standard hand taps, and they can run at
  slightly higher speeds. It pushes chips forward, ideal for through holes and fast
  machine tapping.

Answer 9

Spiral Point Taps (Gun Nose or Bull Nose Taps)

Question 10

have an open spiral like an endmill, which ejects chips upward, making them
ideal for blind holes. They are also preferred for interrupted holes, as the spiral
design helps restart threading past intersecting features.

Answer 10

form or roll taps (thread forming taps)

Question 11

these are thread taps with a long shank to facilitate reaching difficult holes that
are blocked by other features on the part.

Answer 11

extension taps (long shank taps)

Question 12

these thread taps only have a tooth for every other thread to provide improved
chip extraction. Removing every other tooth helps break chips and also provides
more room for the chip to escape and for lubricant to come in and do its job. Used
for tough or abrasive materials and deep or difficult holes.

Answer 12

Interrupted Thread Tap

Question 13

makes tapered threads that seal tightly for fluid or air systems and creates
threads that become tighter as the tap goes deeper. It is required in plumbing,
hydraulics, pneumatics, and piping systems.

Answer 13

pipe taps

Question 14

straight grooves and cuts evenly on all sides. Often used for harder materials
or short-chipping materials like cast iron and general-purpose tap but not as
efficient as spiral taps in chip evacuation.

Answer 14

Straight Flute Tap

Question 15

tapered end of a tap that helps start threads smoothly.

Answer 15

chamfer

Question 16

Special Purpose of Taps

Answer 16

Creating Internal Threads: The primary purpose of tapping is to cut
internal threads in pre-drilled holes.

Facilitating Assembly: Tapping enables the assembly of parts in
various industries, including automotive, aerospace, and
manufacturing.

Precision and Strength: Tapping provides precise control over
thread depth and quality, which is essential for ensuring that
fasteners fit correctly and can withstand mechanical loads.

Efficiency in Production: Automated tapping
machines improve production efficiency by
allowing for rapid and consistent creation of
threaded holes.

Versatility: Tapping can be performed
on various materials, including metals
and plastics, making it a versatile
technique in machining.

Question 17

grooves in the tap that allow chips to escape during cutting.

Answer 17

flute

Question 18

hole that goes completely through the material.

Answer 18

through hole

Question 19

hole that does not go all the way through

Answer 19

blind hole

Question 20

distance between threads, measured in mm or threads per inch (TPI)

Answer 20

thread pitch

Question 21

standard size of the tap or thread

Answer 21

nominal size

Question 22

distance the thread extends into the hole.

Answer 22

thread depth

Question 23

angle of spiral cutting edges, which affects chip removal.

Answer 23

helix angle

Question 24

gradual reduction in diameter at the start of a tap.

Answer 24

taper

Question 25

tap with medium taper used to continue threads.

Answer 25

plug

Question 26

tap with minimal taper to cut threads to the bottom of a blind hole

Answer 26

bottoming

Question 27

tap with minimal taper to cut threads to the bottom of a blind hole

Answer 27

bottoming

Question 28

causes of broken taps

Answer 28

Incorrect Tap selection Wrong drill size Lack lubrication/Cutting fluid Improper Feed Misalignment Chip Buildup Hard or Tough Material Poor Workpiece Holding Poor Machine Condition setup

Question 29

methods used to remove broken tap

Answer 29

Tap Extractor - Special tool with fingers that grip tap flutes 2.Chisel and Hammer - Carefully chisel around the edges of the broken tap to create notches. Then use a hammer to strike the tap at an angle, aiming to rotate it counterclockwise for removal. 3. Drilling Out - Uses carbide or cobalt drill bits to break tap into pieces 4.EDM (Electrical Discharge Machining) - High-precision method that electrically erodes the broken tap. 5. Welding - Weld a small metal rod or nut onto the exposed part of the broken tap. This provides a grip for rotating the tap counterclockwise and removing it.

Question 30

causes of broken taps

Answer 30

Incorrect Tap selection Wrong drill size Lack lubrication/Cutting fluid Improper Feed Misalignment Chip Buildup Hard or Tough Material Poor Workpiece Holding Poor Machine Condition set

Question 31

tapping and thread cutting operation

Answer 31

Drill and Drill Bit: Choose a drill bit that matches the size of the tap you will use. This ensures the hole is correct diameter for threading. Tap: Select the appropriate tap based on the thread size and type you need. Taper taps are commonly used to start the threading process, while bottoming taps are used to finish threads to the bottom of a hole. T-Handle or Tap Wrench: This tool holds the tap securely and allows you to turn it easily. Drilling Oil: Lubricate the tap and hole to reduce friction and heat during the tapping process

Question 32

work process of tapping

Answer 32

1.. Secure the Workpiece: Clamp the metal workpiece firmly on the workbench or machine vise to prevent any movement during tapping. 2. Mark the Location: Mark the exact spot where the hole will be drilled using a center punch or marker. This ensures accuracy and prevents the drill bit from slipping during drilling. 3. Drill the Hole: Use the correct drill bit to make a hole slightly smaller than the desired thread size. Make sure the hole is clean and straight. 4. Select the Tap: Choose the right tap (taper, plug, or bottoming) depending on the hole depth and thread type. 5. Insert the Tap in Wrench: Place the tap in the T-handle or tap wrench and ensure it’s held tightly.

Question 33

work process of tapping

Answer 33

6.Apply Lubricant: Add drilling or cutting oil to the tap and hole to reduce friction and prevent breakage. 7. Start Tapping: Align the tap vertically into the hole and turn it clockwise slowly, letting it cut its own path. 8. Break the Chips: After every full turn, rotate the tap half a turn backward to remove metal chips. 9. Finish and Clean: Continue until reaching the desired depth, then reverse the tap out carefully and clean the threads. Result: Internal threads are formed inside the hole, ready to receive a bolt or screw