Industrial Machinery

 

Designing foundations supporting machine tools requires sound engineering procedures for a reliable result. An incorrectly designed foundation is extremely difficult to correct once installed. Consequently, many engineers use Fabreeka isolation materials and machine mounts, knowing that they provide vibration isolation and leveling for proper machine tool installation.

 

Fabreeka also provides solutions for applications when it is not desirable or feasible to mount a machine directly on vibration isolators. For example, installing vibration isolators on a machine whose frame or bed requires a stiff connection can cause bending, relative displacement or sagging and other problems, even when the floor is sufficiently rigid. For cases like this, Fabreeka recommends that the frame or bed is attached to a properly designed concrete foundation, which is then supported on appropriate isolators for the application.

 

In many cases, manufacturing and quality control must co-exist in work-cells or in close proximity to one another. For certain machine tools, the permissible amplitudes of foundation vibrations in a manufacturing environment are very low. It often is very difficult to decrease or isolate vibration amplitudes by simply pouring a new foundation on soil. It also may not be possible to increase the stiffness or rigidity of the machine support structure, often floors, itself to avoid resonance or amplification of vibration. In these cases, unacceptable vibration amplitudes can be significantly reduced by using vibration isolators provided by Fabreeka.

 

Certain types of machine tools are not inherently rigid and therefore need a rigid support to maintain their prescribed accuracy. In other types of machinery, such as printing presses, consisting of articulated components, a rigid support may be needed to maintain the proper alignment of working parts. Fabreeka is a trusted partner and supplier in those cases as well.

 

Engineering disciplines involved in the proper design procedures for isolated support foundations include theory of vibrations, geotechnical engineering or studying soil characteristics plus structural design and analysis.

 

Rotating Equipment

 

Fabreeka isolation products provide vibration control on a wide variety of rotating and reciprocating machinery and equipment that produce vibration during operation. Our engineers work closely with OEMs as well as end users to obtain the operating frequencies, dynamic or unbalanced loads, critical alignments and isolation mount specifications for a complete isolation solution.

 

In line with this, fans, blowers, motors, reciprocating and screw type pumps as well as compressors, engine-generator sets, gear boxes and generators are all applications where Fabreeka or Fabcel isolation pads, washers and bushings can be used. They are also the right choice to prevent roof top HVAC vibration.

 

Depending on the rotational speed of the equipment and its weight support area, other Fabreeka products, namely Fabcel pad or machine support foundation isolation products such as FAB-EPM, FAB-EFP and Fabsorb are qualified.

 

Turnkey solutions are also available at Fabreeka, including demolition, foundation design and concrete construction if a foundation is needed for rotating and other equipment.

 

Other Equipment

 

Fabreeka Crane Rail pad material is used to reduce vibration, stresses and mechanical wear and tear associated with bridge, gantry and ore crane operation, thereby reducing maintenance costs. Fabreeka Crane Rail pads are designed to relieve girder stress, improve load distribution, eliminate mechanical wear of flange or cover plates, dampen vibration and reduce noise.

 

The laminated thermoset plastic (LTP) surface of the crane rail pad improves wear resistance, restricts lateral movement and provides a low coefficient of friction support for the rail. Tests performed by independent sources have shown up to 40% reduction in runway beam web stress and noise levels reduced substantially when using this Fabreeka product.

 

Automation equipment such as assembly and packaging equipment can cause vibration affecting other equipment or may be sensitive to vibration coming from the manufacturing floor. Vibration isolation products such as Fabreeka or Fabcel pad plus isolation washers and Fabreeka bushings can be used to reduce the vibration to more acceptable levels, as is also the case with milling machines, CNC and other machine tools that may also be sensitive to factory floor vibration, influencing their accuracy.

 

Last, not least, injection molding machines can cause disturbing vibration to other machines when molds are opening and closing. Depending on the size, pad products supplied by Fabreeka can be placed directly under the machine or support the machine and a foundation to add rigidity.
Precision Equipment

 

Precision equipment manufacturers, end users and everybody interested in precise production or accurate measuring results find complete solutions at Fabreeka.

 

Whether in metrology with the need for CMM isolation (coordinate measuring machine) or laboratory equipment isolation for microscopes, Fabreeka is a proven and trusted partner in this and many other fields to provide customers with PAL and PLM low frequency vibration and shock isolation systems to maintain the designed accuracy of your equipment.

 

Some applications require custom systems and structural analysis and design of the support structures and frames used in conjunction with the isolation system and integrated in the machine design. Fabreeka’s experts are here to support you in those cases as well. Add their experience from countless successful projects to your task and let their customer-specific solutions together with high-quality products exceed your requirements. With decades of experience in foundation isolation, Fabreeka has all the answers to your questions from initial consultation to complete turnkey solutions.

 

Find out more reasons why Fabreeka can make an important difference in this field in which the degree of accuracy required for precision machine tools is ever-increasing.

 

Precision Manufacturing

 

Precision manufacturing is needed for many different industries such as aerospace, industrial, medical, military, semiconductor and many others. There, the equipment that cuts, turns, polishes and positions with nanotechnology can provide finishes and measurements within microns and even angstroms.

 

To achieve the best results possible with the equipment in every environment, Fabreeka has developed matching isolation and foundation products. Working with and at CNC machines or precision lathes, among many others, can be optimized by incorporating Fabcel pads, Fabcel Lev-L mounts, or Fabcel LeveLers.

 

When it comes to ultra-precision equipment being used in many industries including semiconductor wafer processing, optics and lens manufacturing and non-standard material machining processes, low frequency pneumatic Precision-Aire Leveling isolators (PAL) provide superior low frequency vibration isolation. Customers worldwide rely on Fabreeka PAL isolators, knowing that they meet the critical needs of metrology instruments, electron microscopes, inspection stations and other precision manufacturing equipment.

 

Laboratory

 

Laboratory work is a synonym for precision work where laboratory equipment isolation is a must. Professionals using tabletop microscopes and electron microscopes for biomedical research, semiconductor manufacturing or other tasks want the highest accuracy and the best resolution. To prevent human footfalls and structural vibration from decreasing performance and accuracy of their microscopes, many companies and institutions use PAL low frequency, pneumatic isolation systems which provide attenuation not only in laboratories and clean-rooms but wherever laboratory equipment isolation is on the agenda.

 

Analytical balances and precision scales also need stable work conditions for accurate measuring. Here, Fabreeka offers pneumatic isolation products and active systems for added vibration reduction to rule out that even small oscillations or vibration that can alter weight results go unnoticed by lab personnel. This could be the case when equipment is moved across the laboratory floor, heavy traffic outside affects the building or other activities in other areas of the building create vibration.

 

MRI and NMR become more and more important to study humans and materials. Fabreeka is committed to the science of MRI vibration isolation, working both ways with products that reduce the vibration coming from the environment and also the induced MRI vibration into the building. Thus, Fabreeka has provided customers with vibration isolation solutions for all types of high resolution MRI, NMR and Cryostat equipment ranging in size from 300 MHz to 900 MHz. All pneumatic isolator hardware for NMR applications is made non-magnetic using stainless, aluminum or brass and is designed to interface with the existing magnet support brackets at the desired height. MRI vibration isolation solutions include vibration measurements and the design of the support structures, including structural and dynamic analysis.

 

Metrology

 

Metrology is a fascinating field with steady increases in measuring speed and accuracy of Coordinate Measuring Machines (CMM) and optical equipment. Since vibration is one environmental factor which can compromise a CMM’s accuracy and repeatability, Fabreeka has extensively studied allowable vibration criteria and put a lot of work in developing Vibration Site Survey and Analysis services to help customers determine if they need CMM isolation or not. When it is the case, typically low frequency vibration of less than 50 Hz requires attenuation. Fabreeka pneumatic isolators such as PAL Isolators and PLM Mounts provide significant CMM isolation and for other metrology equipment requiring low frequency vibration control.

 

Along with the standard pneumatic isolation systems that let most CMM function properly, Fabreeka systems can also be custom-made to be integrated into the machine. When larger CMM require foundations, Fabreeka is the number one resource for pneumatic isolators or pad isolators for foundation isolation. Fabreeka can also offer a foundation turnkey solution including project management, demolition, foundation design and construction.
Testing

 

Fabreeka has a leading role in providing vibration isolation systems and design techniques to meet the increasing demands of automotive, aircraft and aerospace testing in simulated environments. The company has been providing vibration isolation and shock control products for the past decade, utilizing combined expertise for customized projects and turnkey solutions.

 

In doing so, the solutions for auto testing include the design of test equipment support foundations and their reaction masses together with structural and dynamic analysis. Applications range from dynamometers, rolling road isolation, road simulators, multi-axis shaker tables to many kinds of other test equipment.

 

To support engineers in aircraft testing, Fabreeka has designed a number of soft support systems using standard and custom pneumatic isolators for ground vibration testing, while the company provides low frequency vibration isolation systems for critical testing applications in the aerospace and defense industry, which require ultra-low frequency isolation and vacuum chamber isolation.

 

Additionally, Fabreeka provides solutions for foundation isolation as well as for material testing machines including tensile, compression and fatigue testing equipment that can create vibration and shock.

 

Aerospace Testing

 

When performing testing of large spacecraft or hardware that will be launched into orbit, it is necessary to conduct testing in a space-simulated environment. To achieve this, a vacuum chamber or thermal vacuum chamber is used which creates an environment to simulate the pressure and thermal effects of launch or space travel in orbit.

 

It is necessary to decouple the spacecraft or payload from the chamber using Fabreeka vibration isolators to attenuate environmental vibration from the testing. In some cases, where feasible, the entire chamber with payload is decoupled from the test facility. In cases where the size of the vacuum chamber, or the existing chamber, does not allow for external isolators the test payload must be isolated inside the chamber. To achieve this, a vacuum compatible isolation system is used. When isolators are used inside a vacuum chamber, they must meet strict material specifications to limit out-gassing and be constructed to fulfill particulate and molecular cleanliness requirements as well. Additionally, in thermo-vacuum applications, the isolators may be required to function in temperature extremes where heater blankets are necessary to keep them at an operable temperature.

 

Applications often include nano-type measurements and can have error budgets within microns or tenths of arc seconds. In this sensitive field, experts cooperate with Fabreeka and use customized stainless steel PAL isolators for vacuum chamber isolation with a special design to keep air permeation to a minimum so the vacuum chamber can achieve deep vacuum levels. The assembly can be done in a clean-room environment, and isolator components can be baked out to minimize out-gassing.

 

Aircraft Testing

 

Fabreeka has designed a number of soft support systems (SSS) using standard and custom pneumatic isolators for ground vibration testing (GVT) of aircraft. To obtain accurate results during GVT, the modal testing of the aircraft requires simulation of a “free-free” condition. To achieve this condition, Fabreeka works with the structural and dynamics testing groups of aircraft manufacturers to design the required SSS for the GVT.

 

The pneumatic isolators support and decouple the aircraft from the ground when the aircraft is undergoing GVT and modal or flutter analysis. The role of the system is especially important in identifying structural resonances and validating flutter models. The SSS can include a mechanical jacking system to lift the aircraft off of its landing gear. Fabreeka’s custom isolator designs can achieve a natural frequency as low as 0.5 Hz.

 

Professionals are well aware that they save time during testing by using a Fabreeka custom system since traditional methods such as bungee cords are very time consuming due to the bungees being changed out for every load condition.

 

Auto Testing

 

Fabreeka is also a leader in providing vibration isolation systems and design techniques to meet the growing demands of vehicle testing in simulated environments where dynamometers, engine test rigs, road simulators and multi-axis shaker tables are in use. Here, Fabreeka’s technical expertise includes the structural design of support structures and reaction masses; static and dynamic analysis and acceptance testing.

 

In many cases when the forces are not extreme and the frame or base of the machine is rigid, Fabreeka's PAL or RLA pneumatic isolators are directly placed under the equipment, namely dynamometers or vibration tables. RLA isolators offer a larger piston stroke to handle larger dynamic loads typically seen in vibration testing applications such as shakers and 4-post-shakers without compromising the natural frequency of the system.

 

PAL or RLA pneumatic isolators are also the right choice for supporting a concrete foundation with the test equipment. Over decades, Fabreeka has gained the expertise to develop all types of vibration isolation projects for automotive testing and can provide a turnkey solution including foundation design, demolition, construction work, bedplate, installation and acceptance testing.

 

Countless successful projects with car and truck manufacturers are also proof of Fabreeka's know-how from concept to the final production model in rolling road isolation.

KEY FEATURES/BENEFITS

  • While pressurized, Fabreeka PLM elastomer air springs will isolate frequencies from as low as 5 Hz
  • When pressurized, PLMs will isolate frequencies above 14 Hz
  • The ratio of vertical to horizontal natural frequency is approximately 1:1 with high horizontal stability

Our Fabreeka® PLM air spring, or pneumatic isolation mounts, are low-frequency vibration and shock isolators to reduce unwanted vibration while leveling the devices they support.

 

When used as a vibration damper, the internal air chamber ensures significant isolating effects from as low as 5 Hz, as its natural frequency is only 3.0 Hz. PLM air spring elements also isolate while unpressurized. The vertical natural frequency of the elastomer body is around 10 Hz and will therefore isolate interfering frequencies above 14 Hz.

 

The ratio of vertical to horizontal natural frequency with Fabreeka’s elastomer air spring is approximately 1:1 with high horizontal stability. The elastomer wall design in PLM air springs ensures large dynamic spring travel for applications vulnerable to shock and impact. External spacers / stops are advisable to prevent air spring strikethrough where low natural frequency of 3 Hz is still required.

 

The Fabreeka PLM pneumatic elastomeric mounts include a vulcanized threaded inlet for inflating the air springs, using either a Schrader valve or pneumatic screw attachment. No special connections are needed. Air springs with pneumatic screw connectors can be connected to the respective controlled air supply which eases pressurization and leveling.

FAQS

What methods are available for pressurizing and leveling the PLM isolators?
A hand pump or a regulated, compressed air supply can be used for pressurizing and leveling the PLM isolators. See maximum pressure on mount.

 

Can PLM isolators be supplied w/leveling valves for automatic self leveling?
Yes. The tank valve is replaced with a push fitting, and a custom base plate is required to attach the valve.

 

How often do I need to re-pressurize the PLM mounts?
You should not have to re-pressurize these mounts often. However you should periodically (monthly) check the inflated height, as temperature can have an effect on the air pressure.

 

Are metric threads available for the top plate?
Yes. Please contact Fabreeka’s Engineering department at 1-800-322-7352 or info@fabreeka.com to discuss your application.

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