The document discusses various aspects of screw threads and their measurement. It defines key screw thread terminology like pitch, lead, major diameter, minor diameter, effective diameter, flank angle, etc. It describes different types of threads and their uses. It then explains various methods to measure elements of a screw thread like major diameter, minor diameter, pitch, effective diameter and flank angle. These include using a micrometer, bench micrometer, pitch measuring machine, toolmaker's microscope and different wire methods. The concept of best wire size for effective diameter measurement is also introduced.
This presentation gives the information about Screw thread measurements and Gear measurement of the subject: Mechanical measurement and Metrology (10ME32/42) of VTU Syllabus covering unit-4.
This presentation gives the information about Screw thread measurements and Gear measurement of the subject: Mechanical measurement and Metrology (10ME32/42) of VTU Syllabus covering unit-4.
MILLING – Cutting parameters, machine time calculation
Milling operation – Plain milling, side & face milling, form milling, gang milling, end milling, face milling, T slot milling, slitting
GEAR CUTTING – Gear cutting on milling machine – dividing head and indexing method, gear hobbing, principle of operation, advantages & limitation, hobbing tech, gear shaping, gear finishing process
MILLING – Cutting parameters, machine time calculation
Milling operation – Plain milling, side & face milling, form milling, gang milling, end milling, face milling, T slot milling, slitting
GEAR CUTTING – Gear cutting on milling machine – dividing head and indexing method, gear hobbing, principle of operation, advantages & limitation, hobbing tech, gear shaping, gear finishing process
Test for straightness by using spirit level and Autocollimator
The straightness of any surface could be determined by either of these instruments by measuring the relative angular positions of number of adjacent sections of the surface to be tested. First straight line is drawn on the surface then it is divided into a number of sections the length of each section being equal to the length of sprit level base or the plane reflector’ s base in case of auto collimator. The bases of the spirit level block or reflector are fitted with two feet so that only feet have line contact with the surface and the surface of base does not touch the surface to he tested. The angular division obtained is between the specified two points. Length of each section must be equal to distance between the centerlines of two feet. The special level can be used only for the measurement of straightness of horizontal surfaces while auto-collimator can be used on surfaces are any plane. In case of spirit level, the block is moved along the line equal to the pitch distance between the centerline of the feet and the angular variation of the direction of block. Angular variation can be determined in terms of the difference of height between two points by knowing the least count of level and length of the base.
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Using recycled concrete aggregates (RCA) for pavements is crucial to achieving sustainability. Implementing RCA for new pavement can minimize carbon footprint, conserve natural resources, reduce harmful emissions, and lower life cycle costs. Compared to natural aggregate (NA), RCA pavement has fewer comprehensive studies and sustainability assessments.
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
Forklift Classes Overview by Intella PartsIntella Parts
Discover the different forklift classes and their specific applications. Learn how to choose the right forklift for your needs to ensure safety, efficiency, and compliance in your operations.
For more technical information, visit our website https://intellaparts.com
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Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
3. Screw thread- definition
A screw thread is the helical ridge produced by forming
a continuous helical groove of uniform section on the
external or internal surface of a cylinder or a cone.
A screw thread formed on a cylinder is known as straight
or parallel screw thread, while the one formed on a cone is
known as tapered threads.
4. Types of Thread
External thread: a thread formed on outside of a
work piece is known as external thread. Example:
on bolts or studs etc.
Internal thread: a thread formed on inside of a
work piece is known as internal thread. Example:
on a nut or female screw gauge.
5. Screw Thread - Use
Screw threads are used:
• Tohold parts together-act as fastners (ex: V-threads)
• Totransmit motion &power (Square, Acme threads)
7. Screw Thread Terminology
Pitch: The distance from a point on a screw thread to a
corresponding point on the next thread measured parallel to the
axis.
Lead: The distance a screw thread advances in one turn. For a
single start threads, lead=pitch, For double start, lead=2xpitch, & so
on.
Thread Form: The cross section of thread cut by a plane containing
the axis.
Major Diameter: This is the diameter of an imaginary cylinder, co-
axial with the screw, which just touches the crests of an external
thread or roots of an internal threads. It is also called as ‘Nominal
diameter’
8. Screw Thread Terminology
Minor diameter: This is the diameter of an imaginary cylinder, co-axial
with the screw which just touches the roots of an external thread or the
crest of an internal thread. This is also referred to as ‘root’ or ‘core
diameter’.
Effective diameter or Pitch diameter: It is the diameter of an imaginary
cylinder coaxial with the axis of the thread and intersects the flanks of the
thread such that width of the threads & width of spaces between threads
are equal.
Flank: It is the Thread surface that connects crest with root.
Depth of thread: It is the distance between crest and root measured
perpendicular to axis of screw.
9. Screw Thread Terminology
Angle of thread: Included angle between sides of thread measured
in axial plane.
Helix angle: Angle that the thread makeswith plane perpendicular
to thread axis.
Flank angle: It is half the included angle of the thread.
Addendum: It is the distance between the crest and the pitch line
measured perpendicular to axis of the screw.
Dedendum: It is the distance between the pitch line & the root
measured perpendicular to axis of the screw.
10. Measurement of Various Elements Of Thread
Tofind out the accuracy of a screw thread it will be necessary
to measure the following:
1)Major diameter.
2)Minor diameter.
3)Effective or Pitch diameter.
4)Pitch
5)Thread angle and form
11. Measurement of Major Diameter
Bench micrometer
The instruments
which are used to
find the major
diameter.
12. Ordinary micrometer
The ordinary micrometer is quite suitable for measuring the
external major diameter.
It is first adjusted for appropriate cylindrical size (S) having
the samediameter (approximately).This process is known as‘ gauge
setting’ .
After taking this reading ‘ Rthe micrometer isset on the major
diameterof the thread,andthe newreadingis‘R2
13. Measurement by Bench Micrometer:
Clamp
Fiducial
Indicator
M easuring
Anvils Holding centres
Micrometer head
Supports
BENCH MICROMETER
14. Measurement by Bench Micrometer
For getting the greater accuracy the bench micrometer is used for
measuring the major diameter.
In this process the variation in measuring Pressure, pitch errors are
being neglected.
The fiducial indicator is used to ensure all the measurements are made
at same pressure.
The instrument has a micrometer head with a vernier scale to read the
accuracy of 0.002mm. Calibrated setting cylinder having the same
diameter as the major diameter of the thread to be measured is used as
setting standard.
After setting the standard, the setting cylinder is held between the
anvils and the reading is taken
15. Measurement by Bench Micrometer
Then the cylinder is replaced by the threaded work piece and the
new reading is taken
17. Measurement by Bench Micrometer:
Holding
centre
Measuring
anvil
Holding
centre
Measuring
anvil
Standard
Cylinder
Screw
Thread
Measurement of Major Diameter
18. Measurement of the Major Diameter of an Internal Thread
An indirect approach of measuring internal dia is obtained by
obtaining the cast of the Thread. The main art thus lies in obtaining a
perfect cast.
20. Measurement of Minor Diameter
The minor diameter is measured by a comparative method by using
floating carriage diameter measuring machine and small ‘ V pieces which
makecontactwith the root of the thread.
These V pieces are made in several sizes, having suitable radii at
the edges.
V pieces are made of hardened steel.
The floating carriage diameter-measuring machine is a bench
micrometer mounted on a carriage.
22. The threaded work piece is mounted between the centres of
the instrument and the V pieces are placed on each side of the
work piece and then the reading is noted.
After taking this reading the work piece is then replaced
by a standard reference cylindrical setting gauge.
Measurement of Minor Diameter
23. Measurement of Minor Diameter of Internal Threads
The Minor diameter of Internal threads are measured by
1. Using taper parallels
2. Using Rollers.
1. Using taper parallels:
For diameters less than 200mm the use of
Taper parallels and micrometer is very
common.
The taper parallels are pairs of wedges
having reduced and parallel outer edges.
The diameter across their outer edges can be
changed by sliding them over each other.
24. For more than 200mm diameter this
method is used. Precision rollers are
inserted inside the thread and proper
slip gauge is inserted between the rollers.
The minor diameter is then the length of
slip gauges plus twice the diameter of
roller.
2. Using rollers:
25. Pitch Measurement
The most commonly used methods for measuring the
pitch are
1. Pitch measuring machine
2. Tool makers microscope
3. Screw pitch gauge
29. 1.Worktable is placed on the base of the instrument.
2.The optical head is mounted on a vertical column it can be moved up and down.
3.Work piece is mounted on a glass plate.
4.A light source provides horizontal beam of light which is reflected from a mirror
by 90 degree upwards towards the table.
5.Image of the outline of contour of the work piece passes through the objective of
the optical head.
6.The image is projected by a system of three prisms to a ground glass screen.
7.The measurements are made by means of cross lines engraved on the ground
glass screen.
8.The screen can be rotated through 360°.
9.Different types of graduated screens and eyepieces are used.
Tool Makers Microscope
30. Pitch Measuring Machine
When the pointer is accurately placed in position, the micrometer reading is noted. The
stylus is then moved along into the next thread space, by rotation of the micrometer, and a
second readingtaken.
The difference between the two readings is the pitch of the thread. Readings are taken in
this manner until the whole length of the screw thread has been covered.
Spring loaded head permits the
stylus to move up the flank of the
thread and down into the next space
as it is moved along.
Accurate positioning of the stylus
between the two flanks is obtained
by ensuring that the pointer T is
always opposite to its index mark
when readings are taken.
33. Measurement of effective diameter
Effective diameter measurement is carried out by following
methods.
1. Two wires method
2. Three wires method.
3. Micrometer method.
34. Two Wire Method
The effective diameter can not be measured directly but can be
calculated from the measurements made.
Wires of exactly known diameters are chosen such that they contact
the flanks at their straight portions.
If the size of the wire is such it contacts the flanks at the pitch line, it
is called the ‘best size’ of wire which can be determined by geometry
of screw thread.
The screw thread is mounted between the centers & wires are placed
in the grooves and reading M is taken.
Then the effective diameter E =T+P
where T =M-2d, & P is a value which depends on diameter of wire,
pitch & angle of the screw thread.
40. Three Wire method
The three-wire method is the accurate method.
In this method three wires of equal and precise diameter are
placed in the groves at opposite sides of the screw.
In this one wire on one side and two on the other side are
used. The wires either may held in hand or hung from a stand.
This method ensures the alignment of micrometer anvil
faces parallel to the thread axis.
42. This method is more accurate than two wire method as it ensures
alignment of micrometer faces parallel to the thread axis.
Here, three wires of exactly known diameters are used, one on one
side & the two on the other side. The wires may be held in hand or
hung from a stand.
From the fig, M=diameter over the wires E= effective
diameter (to be found) d= diameter of wires, h=height of
wire center above the pitch line, r=radius of wire,
H=depth of thread, D=major diameter of the thread.
Three Wire method
44. 2 2
2 2
4
H DEcot
P
cot
and CD
H
P
cot
2 2 2 2 4 2
Further h (AD CD)
d
cosec
P
cot
2 2 4 2
Distance over the wires, M E 2h 2r
the triangl e ABD , AD AB cosec
d
cosec
2 2 2
From
2
Or M E d cosec
P
cot
1
2
2
P
P
cot
2r E 2r1 cosec cot
i.e. M E 2rcosec
2
Three Wire method
45. 2 2
M D 3.1657d 1.605P where Dis the major diameter of the thread.
For Metric threads, Depth of thread 0.6495P
E D 0.6495P, 60o
,cosec
2,cot
1.732
2 2
M D 3d 1.5155P
We can measure the valueof M practically & then
compare with the theoretical valuesusing formulae derived above.
After finding the correct value of M, as d is known, E can be found out.
E D -0.64P, cosec
2.1657, and cot
1.921
For Whitworth thread, 55o
,depth of thread 0.64P
Three Wire method
47. P
where P is the pitch of the thread.
4
2
ABsec .
2
cos
2
AB
sin90 -
2
The best size wire is the one which makes contact at the pitch line
or effectivediameter of the screw thread.In other words, as shown in fig OB
is perpendicular to flank portion of the thread at the pitch line.
b
D 2 sec
P
sec
b
P
b
But OB radius of wire
1
dia of bestsize wire (D )
i.e.D 2 OB 2ABsec .Alsosince AB lies on the pitch line, AB
2
OB
AB AB
In the triangle OAB, SinBOA , orsin90 -
OB 2 OB
AB
Best Wire Size