Rolling contact bearings and design procedureJashavant singh
this slide will give you idea about the rolling contact bearing , its types application areas and also you will learn how to design rolling contact bearing ,
comparison between the rolling contact and sliding contact bearing , advantage and disadvantages.
Rolling contact bearings and design procedureJashavant singh
this slide will give you idea about the rolling contact bearing , its types application areas and also you will learn how to design rolling contact bearing ,
comparison between the rolling contact and sliding contact bearing , advantage and disadvantages.
,bearings ,function of bearing ,footstep or pivot bearing ,bush and direct-lined housing ,thrust bearing ,journal bearing ,ball and roller bearings ,types of rolling bearing ,sliding contact bearing ,applications of roller bearings
Definition, Use, Types of beariings, Types of Journal bearing, Materials for journal bearing, Failures of journal bearing, Design terms for journal bearing, Types of roller contact bearing, applications of roller contact bearing, Designation of roller contact bearing, Design terms for roller contact bearing, comparison between journal and roller bearings, characteristics of bearings, selection procedure of bearings
In this PPT you will learn about Bearings, Its Types, Classifications, Uses, How to select them according to use with proper and neat Diagrams and pictures.
Unit 7-gear trains, Kinematics of machines of VTU Syllabus prepared by Hareesha N Gowda, Asst. Prof, Dayananda Sagar College of Engg, Blore. Please write to hareeshang@gmail.com for suggestions and criticisms.
Bearing failure and its Causes and Countermeasuresdutt4190
A brief review about bearing and failure of its various parts due to other possibilities than design such as manufacturing, improper service and handling and other similar aspects.
Rolling Contact Bearing, Selection of Rolling Contact Bearings, Machine Element Design, Bantalan Gelinding, Pemilihan Bantalan Gelinding, Perancangan Elemen Mesin
,bearings ,function of bearing ,footstep or pivot bearing ,bush and direct-lined housing ,thrust bearing ,journal bearing ,ball and roller bearings ,types of rolling bearing ,sliding contact bearing ,applications of roller bearings
Definition, Use, Types of beariings, Types of Journal bearing, Materials for journal bearing, Failures of journal bearing, Design terms for journal bearing, Types of roller contact bearing, applications of roller contact bearing, Designation of roller contact bearing, Design terms for roller contact bearing, comparison between journal and roller bearings, characteristics of bearings, selection procedure of bearings
In this PPT you will learn about Bearings, Its Types, Classifications, Uses, How to select them according to use with proper and neat Diagrams and pictures.
Unit 7-gear trains, Kinematics of machines of VTU Syllabus prepared by Hareesha N Gowda, Asst. Prof, Dayananda Sagar College of Engg, Blore. Please write to hareeshang@gmail.com for suggestions and criticisms.
Bearing failure and its Causes and Countermeasuresdutt4190
A brief review about bearing and failure of its various parts due to other possibilities than design such as manufacturing, improper service and handling and other similar aspects.
Rolling Contact Bearing, Selection of Rolling Contact Bearings, Machine Element Design, Bantalan Gelinding, Pemilihan Bantalan Gelinding, Perancangan Elemen Mesin
How to Make a Field invisible in Odoo 17Celine George
It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
Ethnobotany and Ethnopharmacology:
Ethnobotany in herbal drug evaluation,
Impact of Ethnobotany in traditional medicine,
New development in herbals,
Bio-prospecting tools for drug discovery,
Role of Ethnopharmacology in drug evaluation,
Reverse Pharmacology.
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
The Roman Empire A Historical Colossus.pdfkaushalkr1407
The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
The Roman Empire’s society was hierarchical, with a rigid class system. At the top were the patricians, wealthy elites who held significant political power. Below them were the plebeians, free citizens with limited political influence, and the vast numbers of slaves who formed the backbone of the economy. The family unit was central, governed by the paterfamilias, the male head who held absolute authority.
Culturally, the Romans were eclectic, absorbing and adapting elements from the civilizations they encountered, particularly the Greeks. Roman art, literature, and philosophy reflected this synthesis, creating a rich cultural tapestry. Latin, the Roman language, became the lingua franca of the Western world, influencing numerous modern languages.
Roman architecture and engineering achievements were monumental. They perfected the arch, vault, and dome, constructing enduring structures like the Colosseum, Pantheon, and aqueducts. These engineering marvels not only showcased Roman ingenuity but also served practical purposes, from public entertainment to water supply.
This is a presentation by Dada Robert in a Your Skill Boost masterclass organised by the Excellence Foundation for South Sudan (EFSS) on Saturday, the 25th and Sunday, the 26th of May 2024.
He discussed the concept of quality improvement, emphasizing its applicability to various aspects of life, including personal, project, and program improvements. He defined quality as doing the right thing at the right time in the right way to achieve the best possible results and discussed the concept of the "gap" between what we know and what we do, and how this gap represents the areas we need to improve. He explained the scientific approach to quality improvement, which involves systematic performance analysis, testing and learning, and implementing change ideas. He also highlighted the importance of client focus and a team approach to quality improvement.
Palestine last event orientationfvgnh .pptxRaedMohamed3
An EFL lesson about the current events in Palestine. It is intended to be for intermediate students who wish to increase their listening skills through a short lesson in power point.
3. Introduction to bearings
Objective of bearing is to provide relative
positioning and rotational freedom while
transmitting a load between two parts.
In rolling contact bearings as the name implies
the friction is of rolling type.
It is much smaller than the sliding type.
4. Types of bearings
Rolling Contact Bearings
load is transferred through rolling elements such as balls,
straight and tapered cylinders and spherical rollers.
Journal (sleeve) Bearings
(oil).
load is transferred through a thin film of lubricant
5. Rolling Contact Bearings
Rolling contact bearings are also known as antifriction
bearings.
The load, speed, and operating viscosity of the lubricant
affect the friction characteristics of a rolling bearing.
These bearings provide coefficients of friction between
0.001 and 0.002.
The designer must deal with such matters as fatigue,
friction, heat, lubrication, kinematics problems, material
properties, machining tolerances, assembly, use and cost
6. The rolling contact bearings are composed of four
elements.
i.Outer race
ii.Inner race
iii.Rolling element
iv.Cage of retaining ring
7. Construction Diagram :
Roller contact bearing
With its parts
i.Outer ring (or) Outer
race
ii.Inner ring (or) inner
race
iii.Rolling elements
iv.Cage or retaining ring
8. Classification of rolling bearings
Classified into two types
i.Ball Bearing
•Deep groove (Conrad) bearing
•Filling notch ball bearing
•Angular contact bearings (AC)
ii. Roller Bearing
•Cylindrical bearings
•Needle bearings
•Tapered bearings
•Spherical bearings
9. Ball Bearings
Deep groove bearing
Single row of deep groove ball bearing can combinational of
radial and thrust load.
Load capacity is limited by the number of balls
Primarily designed to support radial loads, the thrust capacity
is about 70% of radial load capacity
10. Filling notch ball bearings
Bearings have the same basic radial construction as
Conrad type. However, a filling notch (loading groove)
permits more balls to be used.
Radial load capacity is 20 – 40% higher than Conrad
type.
Thrust load capacity drops to 20% (2 directions) of
radial load capacity.
11. Angular contact Ball bearings (AC)
The centerline of contact between the balls and the raceway is at an
angle to the plane perpendicular to the axis of rotation.
Used for high radial and thrust load applications
14. Roller Bearings
Roller bearings have higher load capacity than ball bearings,
load is transmitted through line contact instead of point contact.
Helical rollers are made by winding rectangular material into
roller. Due to inherent flexibility they are capable of taking considerable
misalignment.
A roller with length much larger than diameter is known as
needle roller and are used where radial space is limited. Cage nay be
absent in needle roller bearings.
16. If a bearing is clean, properly lubricated and mounted and is
operating at reasonable temp., failure is due to fatigue caused by
repeated contact stresses (Hertzian stress)
Fatigue failure consists of a spalling or pitting of the curved surfaces
Spalling
crack initiates below the curved surface at the location of
maximum shear stress, propagates to the surface causing surface
damage.
Failure criterion – spalling or pitting of an area of 0.01 in 2,
Timken company (tapered bearings)
17. LIFE number of revolution or hours of operation, at constant speed,
required for the failure criterion to develop.
– defines the number of revolution or hours of
operation, at constant speed, in such a way that
of the
bearings tested (from the same group) will complete or exceed
before the first evidence of failure develops. This is known as
life.
For ball bearings and spherical bearings:
L10 = 500 (hours) x 33.33 (rpm) x 60 = 106 = 1 million
revolutions
For tapered bearings manufactured by Timken:
L10 = 3000 (hours) x 500 (rpm) x 60 = 90 x 106 = 90 million
revolutions
Basic Dynamic Load Rating, C constant radial load that a group
of bearings can carry for L10 life.
20. PRELOADING OF BEARING
Preloading or Duplexing is used to eliminate
the play or clearance in either radial or axial
direction of ball bearing to be used for precision
machine tool.
21. Merits of Rolling contact bearings
•
Low starting and good operating friction torque.
•
East of lubrication
•
Requiring less axial space.
•
Generally, taking both radial and axial loads.
•
Rapid replacement
•
Warning of impending failure by increasing noisiness.
•
Good low-temperature starting.
22. Demerits of rolling element bearings:
•
Greater diametric space.
•
More severe alignment requirements.
•
Higher initial cost.
•
Noisier normal operation.
•
Finite life due to eventual failure by fatigue.
•
Ease of damage by foreign matter.
•
Poor damping ability.