Electronics for Imaging (EFI) contracted with Axis New England to design a reference system to test print heads from different manufacturers and understand variations between them. Axis New England designed a system using New Way Air Bearings' 65mm flat round air bearings to provide precise, zero-friction motion. The air bearings enabled the system to meet EFI's stringent specifications of 5 microns of straightness and flatness over the 30" print zone. Testing with the system helped EFI better characterize print heads and further development of inkjet printers.
This is the basic information about bearing, this includes bearing type, selection of bearing depending on exerting loads by the machine on bearings and lubrication method of bearing.
Ceramic bearings are typically constructed with a ferrous inner and outer ring or race with ceramic balls in the place of steel. Ceramic bearings offer many advantages over all steel bearings, such as higher speed and acceleration capability, increased stiffness, lower friction and more. Ceramic balls are also nonconductive. Ceramic bearings are available in all standard industry configurations such as, angular bearings, thrust bearing, pillow block bearing, needle bearings, and roller bearings.
This is the basic information about bearing, this includes bearing type, selection of bearing depending on exerting loads by the machine on bearings and lubrication method of bearing.
Ceramic bearings are typically constructed with a ferrous inner and outer ring or race with ceramic balls in the place of steel. Ceramic bearings offer many advantages over all steel bearings, such as higher speed and acceleration capability, increased stiffness, lower friction and more. Ceramic balls are also nonconductive. Ceramic bearings are available in all standard industry configurations such as, angular bearings, thrust bearing, pillow block bearing, needle bearings, and roller bearings.
This is a presentation about ball bearing manufacturing manufacturing process. There are mainly 6 parts of knowledge included in this presentation. Please visit
Analysis of hydrodynamic fixed pad bearing to reduce vibration by replacing f...ijsrd.com
Rotating machineries are always subject to vibrations due to critical speeds, unbalance, and instability. Usually the least expensive modification of a machine to make is the bearing. A wide variety of bearings have been developed to combat some of the different types of vibration problems. This report consist the analysis of 360deg hydrodynamic bearing of Boiler Feed water Pump. The boiler feed water pump is very critical rotatory equipment of Thermal power plant the bearing of this pump must be able to withstand in vibration and other hydraulic forces while still maintaining a high degree of reliability. This report consist analysis and design of 360 hydrodynamic bearing also replacing fixed pad by flexural pad and analysis bearing vibration and compare vibration for the same condition with the help of FEM Method in ANSYS.
Optimised designs can be supplied in taper roller bearings with high strength cages and, for arduous applications, in a range of advanced special materials.
Team Members :
- Omar Amen Ahmed Mohamed
- Habashy Shabaan Habashy
- Ahmed samy Ali
- Ahmed Ebrahem Bkhit
- Ahmed Mohamed Abdel-Ghany Al-Ashry
- Gheath Mostafa Koujan
- Mohamed Ashraf Kamel
Sliding Contact Bearing Theory Prof. Sagar DhotareSagar Dhotare
In present ppt covers following points:
Introduction of Sliding Contact Bearings
Classification
Applications
Different lubrications systems
Hydrodynamic bearing concept and working
Comparison between sliding and rolling contact bearings
PETROFF’S EQUATION For Hydrodynamic Journal Bearing
Dimensionless Parameters used in SCB
Design procedure for Hydrodynamic Journal Bearing
This is a presentation about ball bearing manufacturing manufacturing process. There are mainly 6 parts of knowledge included in this presentation. Please visit
Analysis of hydrodynamic fixed pad bearing to reduce vibration by replacing f...ijsrd.com
Rotating machineries are always subject to vibrations due to critical speeds, unbalance, and instability. Usually the least expensive modification of a machine to make is the bearing. A wide variety of bearings have been developed to combat some of the different types of vibration problems. This report consist the analysis of 360deg hydrodynamic bearing of Boiler Feed water Pump. The boiler feed water pump is very critical rotatory equipment of Thermal power plant the bearing of this pump must be able to withstand in vibration and other hydraulic forces while still maintaining a high degree of reliability. This report consist analysis and design of 360 hydrodynamic bearing also replacing fixed pad by flexural pad and analysis bearing vibration and compare vibration for the same condition with the help of FEM Method in ANSYS.
Optimised designs can be supplied in taper roller bearings with high strength cages and, for arduous applications, in a range of advanced special materials.
Team Members :
- Omar Amen Ahmed Mohamed
- Habashy Shabaan Habashy
- Ahmed samy Ali
- Ahmed Ebrahem Bkhit
- Ahmed Mohamed Abdel-Ghany Al-Ashry
- Gheath Mostafa Koujan
- Mohamed Ashraf Kamel
Sliding Contact Bearing Theory Prof. Sagar DhotareSagar Dhotare
In present ppt covers following points:
Introduction of Sliding Contact Bearings
Classification
Applications
Different lubrications systems
Hydrodynamic bearing concept and working
Comparison between sliding and rolling contact bearings
PETROFF’S EQUATION For Hydrodynamic Journal Bearing
Dimensionless Parameters used in SCB
Design procedure for Hydrodynamic Journal Bearing
PERFORMANCE ANALYSIS OF GAS LUBRICATED CYLINDRICAL JOURNAL BEARING USING FS...Venkata Sai Teja Gunuputi
To choose the best suitable lubricant for different eccentricity ratio and L/D ratio combinations of journal bearings by considering the pressure, deformation and stress results obtained in analysis.
»Over the last two decades several patents and research papers have reported purported practical methods to extract useful energy from the vacuum. I describe the inventions and analyze the underlying physics. From an analysis based on first principles it is clear that most of the inventions have fundamental errors and cannot work. The basic concept of harvesting zero-point energy remains viable, and at least one patented concept might work.
The vacuum is filled with a high density of zero-point energy, in the form of modes (vibrational patterns) of electromagnetic field. Over the last eight decades it has become clear that this zero-point field (ZPF) vacuum energy is not simply a mathematical formalism, but produces demonstrable effects on physical systems. Along with that realization has come the desire to extract energy from the ZPF.
One set of methods use nonlinear elements to convert the ZPF into a usable form. A rectifier (used to convert AC to DC) is a strongly nonlinear element. One patent makes use of antennas to capture the ZPF. This energy is then rectified and used. Another set of inventions simply rectify fluctuations (noise) in electronic elements as an extraction method. Using a detailed balance argument, I show that these methods cannot work.
Another set of patents describe using a Casimir cavity to mechanically extract energy from the ZPF. A Casimir cavity consists of two closely space reflecting plates that exclude ZPF electromagnetic modes having wavelengths larger than twice the gap spacing. The result is that the imbalance in the density of the ZPF inside and outside the cavity causes the plates to be attracted to each other. This attractive potential can be used, but only once. To produce power continuously, a method must be devised to form a reciprocating Casimir engine. The patents purport to switch off the Casimir attraction while the plates are pulled apart, so that they can repeatedly accelerate together and produce power. This approach is shown to be fundamentally flawed, and cannot produce power continuously.
A recently issued patent describes a method by which vacuum energy is extracted from gas flowing through a Casimir cavity. According to stochastic electrodynamics, the electronic orbitals in atoms are supported by ambient ZPF. When the gas atoms are pumped into a Casimir cavity, where long-wavelength ZPF modes are excluded, the electrons spin down into lower orbitals, releasing energy. This energy is harvested in a local absorber. When the electrons exit the Casimir cavity, they are re-energized to their original orbitals by the ambient ZPF. The process is repeated to produce continuous power. This method does not suffer from the fundamental flaws of the other approaches, and might work.«
Thông số kỹ thuật của quạt làm mát tủ điện SUNON, Catalogue Quạt làm mát tủ điện SUNON, Catalogue quạt hướng trục SUNON, Brushless fan & Blower SUNON Catalogue
EOS DMLS Client APS Technology optimizes the design of a rotary steerable sys...Machine Tool Systems Inc.
Please find attached a case study about the production of oilfield drilling equipment. By using the EOSINT M 280 the American company APS Technology was able to optimize the design of a rotary steerable system which increased the drilling accuracy and reduced post-processing and production costs.
The companies of Altra Industrial Motion offer many critical drivetrain products utilized in papermaking, corrugated and printing machine applications including clutches, tensioning brakes, gear couplings and belted drives.
1. Photos courtesy of EFI and New Way Air Bearings
powertransmissionengineering june 2012 www.powertransmission.com22
ZeroAir Bearings Provide a More-Precise
View of Print Head Variations
2. An EFI printer for which the print head
reference system was developed.
23www.powertransmission.com june 2012 powertransmissionengineering
In the printing industry, image is everything
and reproducing images that are visually pleasing can be a
challenge for large-format printers. The human eye can dis-
cern print resolutions of 300+ dpi using more than 10 million
colors.Unfortunately,slight variations in print heads as well as
in the mechanics of the printers themselves are often directly
translated into artifacts in a print image that the human eye
can easily distinguish.
Electronics for Imaging, Inc. (EFI), located in Foster City,
California, has made a name for itself as a leader in digital
print servers and controllers as well as super-wide format
printers and inks. In order to understand some of these print
head variations, EFI contracted motion control specialist Axis
New England to design and develop a reference mechanical
system for the in-house testing of various print heads from
different manufacturers. Understanding the differences in the
print heads requires a reference system with precise mechanics
that will minimize print artifacts. To accomplish this level of
precision, Axis New England utilized air bearings.
New Way Air Bearings is an independent manufacturer of
modular air bearing products and a provider of porous media air
bearing solutions. The company manufactures a standard line
of modular, off-the-shelf components including: transition and
precision zone air bars; flat round and rectangular air bearings;
vacuum preloaded air bearings; radial air bearings; air bushings;
and air slides. The company’s flat round air bearings were the
first to be offered as a complete product line and they remain
one of the most popular standard components offered by New
Way.The 65 mm flat round bearing seemed a suitable choice for
the needs of the mechanical system in question.
Friction
Solution
3. Unlike rolling-element bearings, air bearings utilize a
thin film of pressurized air to provide a ‘zero friction’ load-
bearing interface between surfaces that would otherwise be
in contact with each other. And unlike traditional ‘orifice’
air bearings, New Way delivers the air through a porous
medium to ensure uniform pressure across the entire bear-
ing surface. This enables a consistent, robust, non-contact
performance that virtually eliminates traditional bearing-
related problems like friction, wear, and lubricant handling.
It also offers distinct advantages in precision positioning,
speed, acceleration, and—as it related to EFI’s require-
ments—straightness and flatness of motion.
New Way’s porous media air bearings are used as an en-
abling technology in an increasing array of linear and/or
rotary motion applications in diverse industries including:
semiconductor, flat panel display manufacturing, CT scan-
ning, medical, automotive, aerospace, metrology and preci-
sion machine tool.
“We knew we would be limited with a rolling-element
bearing,”said Greg Ellrodt,senior systems engineer at Axis
New England.“New Way’s porous media air bearing tech-
nology provides consistent, precision performance charac-
teristics that contact bearings just can’t touch.”
Axis matched these characteristics with a precision Tru-
Stone granite guideway, a combination that enabled EFI
to meet the stringent five-
micron straightness and pla-
nar flatness specifications
required between the lower-axis vacuum table and the up-
per-axis print-head fixture over the center 30" print zone.
Finite element analysis (FEA) and the utilization of In-
var alloy with a low coefficient-of-thermal-expansion were
also required to maintain specifications in the operating
environment. Further, New Way’s gimbal-mount design
and Omron’s precision laser sensors allowed the flatness
to be dialed in “to spec” with slight adjustments to the air
bearings.
The center of gravity of the X-axis carriage was opti-
mized to minimize the pitch and yaw moments on the
air bearings induced by the Parker Trilogy linear motor’s
2G acceleration—up to 2.5 m/s. An ultra-quiet Igus cable
track was required to minimize velocity ripple during the
print process.
The system utilized a Delta Tau Turbo ultra-light con-
troller with Copley Xenus macro drives on a fiber optic
network. This allowed for the seamless integration of the
Renishaw Resolute series of high-accuracy, absolute lin-
ear encoders with 50 Nm resolution on the Y and Z axes,
and Renishaw’s dual-output, tonic series incremental en-
coder. One signal was used to synchronize the printing to
the motion, while the other was used in the control loop.
The entire system was laser-aligned and calibrated with the
Renishaw XL-80 laser system; compensation tables were
applied to the Delta Tau controls to obtain a better than
five micron accuracy over the lengths of travel.
The result is a reference system that provides EFI with
an accurate understanding of print head variation.
“The system delivered by Axis New England has sur-
passed our expectations and original specifications,” said
Lucas Norman, print head engineer II at EFI. “The ex-
treme accuracy that it provides is furthering our ability to
characterize print heads, and will play an important role as
we develop the next generation of inkjet printers.”
Axis New England is a New Way Air Bearings dis-
tributor for the northeastern United States, and one of
22 worldwide. “The advantage of working with Axis New
England is their level of engineering expertise,”noted Tim
Claffey, New Way’s vice president of sales.“Air bear-
ings have been around a long time but sometimes,
still, they require an engineer to think outside the
box; to change the paradigm. Axis understands
air bearings. Not only do they convey
EFI reference mechanical system for the in-house testing of print heads
powertransmissionengineering june 2012 www.powertransmission.com24
4. DESIGN•MANUFACTURE•ASSEMBLE•TEST
Ontario Drive & Gear Limited • New Hamburg, ON, Canada • 1.888.662.2840 • www.ODG.com
Specializing in Quiet Gear Technology
One-stop
powertrain
solutions…
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ODG-one stop powertrain-7x475.pdf 1 12-04-03 3:07 PM
New Way 65 mm flat round air bearing.
25www.powertransmission.com june 2012 powertransmissionengineering
the advantages exceptionally well, but they show their cus-
tomers exactly how to get there, quickly, cost-effectively, and
successfully. The differences are often measured in orders of
magnitude. EFI is just one example.”
For more information:
Gregory Ellrodt, senior systems engineer
Axis New England
6 Cherry Hill Drive
Danvers, MA 01923
Phone: (978) 774-7100
Direct: (978) 406-4070
Greg@axisne.com
www.axisne.com
Michael Wright, director of marketing
New Way Air Bearings
50 McDonald Blvd.
Aston, PA 19014
Phone: (610) 364-3453
mwright@newwayairbearings.com
www.newwayairbearings.com