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STable (©) Vibration Isolation Tables and Damping Plates

 

             

 

Technical Specifications of the STable (©) Active Pneumatic Vibration Isolation Tables

 

Vibration attenuators: 2nd-order, linear phase pneumatic filters built into the cylinders. Using a 2nd-order vibration damping filter is a unique feature of only the STable (©) Active Pneumatic Vibration Isolation Tables.

 

Corner frequency of the high-cut isolators: 10 Hz

 

Membrane material in the cylinders: fine and durable silicone rubber

 

Flatness error: +/- 0.25 mm per meter as maximum, anywhere on the top plate

 

Horizontality error of the top plate on a working vibration isolation table (in other words the hysteresis of the height control): +/- 1.5 mm as maximum, measured between two opposite corners of the top plate, in worst case

 

Gas supply: any kind of non-toxic, non-flammable, non-aggressive, non-corrosive gas (e.g. Nitrogen, compressed air). We recommend to use a Quiet Air Compressor (see below) as the simplest, cheapest and most secure gas supply.

 

Working pressure ranges of the gas supply:

    2.0 to 2.2 Bar for the "small" tables

    5.0 to 7.0 Bar for the "big" tables

 

The absolute pressure limits of the gas supply:

    2.5 Bar for the "small" tables

    7.5 Bar for the "big" tables

 

Color of the leg system: RAL 5019. "You can order any color as long as it is blue" (like T-model was black)

 

Height of the table: height of the leg system is 75 cm, plus the thickness of the top plate.

 

Weight of the leg system: approximately 120 kg

 

Weight of the top plate: depends on the size, 160 kg / m2

 

Rigidity of the top plate: the deformation of a 180 x 149 cm top plate, if 2 kN concentrated force load is applied to its middle point: 12 microns (0.47 mil). We carried out the same measurement on a SmartTable UT top plate, too. The rigidity of STable (©) top plate was two times better.

 

Deformation of the top plate for temperature change: the deformation of a 180 x 149 cm top plate, measured in the middle, if mass load was not modified, but we increased the temperature with 10 Centigrade: 8 microns (0.3 mil). We carried out the same measurement on a SmartTable UT top plate, too. The self deformation of STable (©) top plate for temperature change was nearly three times better (three times smaller deformation).

 

The unit weight (the weight referring to the same size) of STable (©) top plates is approximately two times bigger compared to SmartTable UT top plates. But we will keep manufacturing of welded steel structure top plates, because we focus on the better performance instead of the lighter weight.

 

Top plate is a welded trussed rectangular honeycomb structure made from steel by default. It is covered by dull stainless steel surface, but with special magnetic capability (allow to fix magnetic stands). There are metric M6 holes drilled on the top plate in 100 x 100 mm pattern by default. If you do not need this default hole pattern on the top plate, in other words you need a top plate without holes, you should specify it in the order. There is an orderable option: "Optical" hole pattern, what means M6 threaded holes in 25 x 25 mm pattern on the top plate. Other, custom-specified hole arrangements, or special shaped, even big holes (e.g. for bottom or base port) can be ordered, as well.

 

You can order any size of table. Custom size of table does not mean harder price, only longer manufacturing time is necessary (because they are not on stock as the frequently sold models). The smallest available size is 98 x 66 cm.

 

The User Manual of the STable (©) Active Pneumatic Vibration Isolation Tables is available for download.

 

The detailed Installation Manual and the abridged Steps of Installation leaflet of the Active Pneumatic Vibration Isolation Tables is available for download.

 

There are further useful documents available for download.

 

To help compare the products of different manufacturers we have to emphasize a funny terminological fact. In the documents and descriptions published by our competitors you can find the following product names: Optical Table, Antivibration Table, Anti-Vibration Table, AV Table, Vibration Isolator, Vibration Isolation System, Optical Workstation, Isolated Platform, Isolation Platform, Vibration Isolation Platform, Pneumatic Table, Pneumatic Isolator, Air Table, Vibration Control System, Vibration-Free Table, Vibration Damping System, Vibration Damper, Isolation Frame, Active Vibration Isolator, Pneumatic Post, Active Post System, Laboratory Table, Lab Table, Vibration Isolation Workstation, Active-Air Table, Active-Air Legstand. There are minor differences between them. However it is fascinating, but all these terms basically mean the same as Vibration Isolation Table.

 

 

The parts of the Active Pneumatic Vibration Isolation Table

 

The Active Pneumatic Vibration Isolation Table has got four legs and a top plate. The legs are assembled together with strong horizontal beams. In every legs there is a pneumatic working cylinder on the top of the leg. These working cylinders form a virtual surface, on which the top plate is floating. The actual height of the pistons in the working cylinders are controlled by pneumatic control systems built on the valve assemblies. Physically the Active Pneumatic Vibration Isolation Table has got four legs, but logically it is a table with three legs. This feature gives an excellent stability on the three base points. This trick is realized on that way that the two legs on the front have got their own control systems each. But the two legs on the rear side of the Active Pneumatic Vibration Isolation Table are internally connected parallel and controlled by only one control system. This arrangement forms a virtual middle-position leg between the two rear legs.

 

 

Attenuation diagram

 

You can download the measured attenuation diagram of STable (©) Active Pneumatic Vibration Isolation Tables. In the diagram the relative attenuation is shown as a function of the frequency. During the measurements a vertical excitation was applied at the floor standing the table on. The spectral characteristic of the excitation was a white noise. The measurements were carried out in the time domain and than they were transformed off-line to the frequency domain.

 

 

Active Pneumatic Vibration Isolation Tables (small size)

 

In our terminology "small" size means, if the top plate is smaller than 1.5 m2.

 

Thickness of the top plate: 105 to 165 mm (depending on the size).

 

Height of the top surface of the top plate from the floor (small tables): 82 cm (adjustable +/- 2 cm)

 

For a "small" table, optionally, you can order Impala granite top plate. This is a very resistant and smart material, but it is a very difficult procedure to make holes on the surface of the granite plate. However we accept requirements for a few holes. The specification of the fixing holes on the granite plate should be discussed before placing the order.

 

Maximum mass load of the legs: 4 kN, including the top plate.

 

Picture gallery:    Click on the picture to get it in full size

 

                              

 

 

Active Pneumatic Vibration Isolation Tables (big size)

 

In our terminology "big" size means, if the top plate is bigger than 1.5 m2.

 

Thickness of the top plate: 165 to 345 mm (depending on the size)

 

Height of the top surface of the top plate from the floor (big tables): 90 cm + size-dependent-extra-height. There is a size-dependent addition to the height because of the bigger thickness of the "big" top plates. This addition of height depends on the size of the top plate. For a given size of table please ask us for the actual height. For example the height of a 180 x 149 cm table is 92 cm +/- 2 cm adjustment range.

 

Maximum mass load of the legs: 8 kN, including the top plate.

 

In the pictures below you can see a big table with an option: there is "Optical" pattern on the top surface. All options and optional accessories are listed in the Price List. The options are extra features, they are not included in the default price.

 

        Click on the picture to get it in full size

 

 

Quiet Air Compressor

 

There is a very popular and comfortable accessory of STable (©) Active Vibration Isolation Tables: the Quiet Air Compressor. This compressor requires no adjustment or maintenance, but it can work for decades. The Quiet Air Compressor has got its internal pressure regulator circuit optimized to supply our Vibration Isolation Tables. The working actions of the compressor make no pneumatic or mechanical disturbances for the table.

 

If there are no externally forced mechanical transients on the top plate of the STable (©) Active Vibration Isolation Table, the compressor starts itself a few times a workday. A usual STable (©) Active Vibration Isolation Table has got such a level of air leakage what starts the Quiet Air Compressor one or two times a day. If the Quiet Air Compressor starts itself more than five times a day, please call the repair service.

 

Technical data:

 

Default pressure range for the "small" tables:

    Low (switch on) pressure: 2.0 Bar

    High (switch off) pressure: 2.5 Bar

 

Default pressure range for the "big" tables:

    Low (switch on) pressure: 5.0 Bar

    High (switch off) pressure: 7.0 Bar

 

The default pressure ranges are optimized for STable (©) Active Vibration Isolation Tables manufactured by Supertech Instruments. Other pressure range can also be specified in the order, because we manufacture Quiet Air Compressors for any user defined specification. 

 

Volume of the internal air buffer tank: 3 dm3

 

Supply voltage: 230 VAC (unfortunately 115 VAC versions can not be manufactured)

 

Current consumption in the working periods: 1.6 A

 

Peak current in the starting periods (approximately 2 seconds): 12 A

 

Noise level: 40 dB(A). It is equal to the noise level of a usual household refrigerator.

 

Weight: 20 kg

 

        Click on the picture to get it in full size

 

Important notes:

 

Quiet Air Compressor is not dangerous equipment, but you should inspect it. If you recognize, that your Quiet Air Compressor starts more than three times a day, or even it works continuously, please stop it at once and do not switch it on again! In such a case please call the repair service immediately! A normally working Active Vibration Isolation Table starts the Quiet Air Compressor three times per day as maximum. The total work time of the motor built into the Quiet Air Compressor is 1000 hours. It results, that the lifetime of the Quiet Air Compressor under normal conditions will be approximately 30 years. But if the motor works continuously, the 1000 hours means 41 days only! After spending the lifetime of the motor the Quiet Air Compressor can even catch fire! If the motor stops, but the voltage is applied (it is the situation when a fault appears), the current of the motor is increased dramatically, resulting a very high temperature. There is an internal thermal protector fuse, what normally breaks the current in such a case. But this fuse can also become faulty in worst case, resulting a fire in your lab and the building!

 

Quiet Air Compressor must not be tilted, because the internal lubricant oil would flow out on the tube connectors.

 

The starting current of the Quiet Air Compressor is approximately 12 A. It is decreased to the nominal 1.6 A in a few seconds after starting the motor, but it is necessary to connect the Quiet Air Compressor into a wall plug capable to provide 12 A of current.

 

 

"Optical" hole pattern and "optical" breadboards

 

"Optical" hole pattern means: there are M6 threaded holes in 25 x 25 mm pattern on the top plate. It is an optional feature of the steel-honeycomb top plates. It is useful, if many small optical elements (such as lenses, mirrors, lasers, etc.) should be positioned strongly and precisely. The "Optical" hole pattern can only be drilled in our workshop during the manufacturing process of the steel-polymer honeycomb structured top plates.

 

If you order an "Optical" hole pattern for the full surface of the top plate, we calculate the total area of the top plate as drilled area. The reason of this calculation method is, that the widths of the borders on the edges of the top plate depend on the size of the top plate, but the borders are surely smaller than 25 mm. If you order an "Optical" hole pattern only on a specified, smaller area, we calculate the size of the drilled area as the area of the rectangular defined by the centers of the M6 holes in the corners.

 

"Optical" breadboard means: an additional thin plate containing M6 threaded holes in 25 x 25 mm pattern. This "optical" breadboard can be placed on the top plate of the Vibration Isolation Tables. It is covered by dull stainless steel surface with special magnetic feature.

 

        Click on the picture to get it in full size

 

 

Vertical Spinning Disk Adaptor and Double-Storied (dual layer) Top Plate

 

Vertical Spinning Disk Adaptor is an "optical" breadboard, assembled vertically above the top plate of the STable (©) Active Pneumatic Vibration Isolation Table. There are four strong pillars assembled to the sides of the top plate. These four pillars hold the "optical" breadboard vertically above the microscope. This very strong assembly is able to hold a hard equipment (e.g. spinning disk) connected optically to the microscope.

 

A dual layer table is a usual active pneumatic vibration isolation table, but there is a smaller second layer standing on the top plate on height adjustable legs. We developed the dual layer table constructions for such applications where a heavy optical accessory should be connected to the microscope. An example is a spinning disk, if it is connected to the microscope on the side port. The microscope stands on the top plate on the usual way, and the spinning disk is fixed on the second layer. This is the reason, why the second layer is usually smaller than the top plate itself.

 

Double-Storied (dual layer) Top Plate can be added to any STable (©) Active Pneumatic Vibration Isolation Table. Double-Storied (dual layer) top plate consists of any usual top plate, four pieces of height adjustable legs and an "Optical" breadboard on the top of the height adjustable legs. Its dimensions, such as the height range of its four legs and the desired size of the "Optical" breadboard should be specified in the order.

 

We will publish pictures soon. In the meantime please email us for photos.

 

 

Elastomeric Vibration Isolation Tables

 

There is a simplified vibration isolation method for such applications, which do not require high level of vibration attenuation. This method is based on specially designed elastomer elements. These elements can be used in our standard leg system instead of the pneumatic isolators. We have developed an upgradeable version, as well. The upgrade means: on-site changing of the elastomer isolator elements to active pneumatic isolators.

 

Maximum mass load of the Elastomer Set (4 pieces together): 2 kN, including the top plate

 

 

Damping Plates

 

The Damping Plates are elastomer-based vibration isolator plates for such applications, which do not require high level of vibration attenuation. They can be put onto any given table. We manufacture the Damping Plates in two fixed sizes.

 

Elastomer-based Damping Plate 60 x 40 cm

    Height: 90 mm

    Mass load: 300 N

 

Elastomer-based Damping Plate 75 x 50 cm

    Height: 90 mm

    Mass load: 500 N

 

A product description leaflet of the Damping Plates is available for download.

 

Picture gallery:    Click on the picture to get it in full size

 

               

 

 

Big-load Elastomer Vibration Isolator Cone Unit

 

It is a practical vibration element for self-designed or self-made vibration isolation devices. The necessary number of Big-load Elastomer Vibration Isolator Cone Units built into a system depends on the mass load. Certainly in the aspect of isolation performance it is worse than the active pneumatic isolators. It is a good compromise for price sensitive applications or environments requiring simplicity.

 

Technical data:

 

Nominal mass load of one unit: 400 - 500 N

 

Absolute maximum mass load of one unit: 600 N

 

Design height: 110 to 130 mm, adjustable by the M16 fixing screw

 

Design diameter: 120 mm

 

M16 male thread connector at the bottom side

 

            Click on the picture to get it in full size

 

 

 

Abridged Price List          PRICE LIST          HOME

 

For more information please visit our detailed Price List.

 

All other prices published by Supertech Instruments are end user prices. The vibration isolation products are exceptions. Vibration isolation products are nearly always ordered by reseller partners. This is the reason, eliminating the need of calculations, why this section is written in reseller prices.

 

The smallest size of Active Pneumatic Vibration Isolation Table what we manufacture is 66 x 66 cm. You can order any size of table equal to or bigger than the smallest one. Custom size of table does not mean harder price, only longer (nominally 60 days) manufacturing time is necessary, because they are not on stock as the frequently manufactured models.

 

Usually we keep the most popular, frequently manufactured models on stock for fast delivery. All of them are Active Pneumatic Vibration Isolation Tables. Examples of these sizes (with default top plates, without "optical" pattern and without optional accessories):

    980 x 660 mm table: 2916 EUR

    1100 x 800 mm table: 3314 EUR

    1220 x 760 mm table: 3395 EUR

    1500 x 980 mm table: 4323 EUR

    1800 x 1490 mm table: 6396 EUR

 

Quiet Air Compressor: 540 EUR

 

"Optical" hole pattern (M6 threaded holes in 25 x 25 mm pattern) on the top plate: 4 EUR / dm2

 

Set of Casters (wheels), 4 pieces, fixed version. It can be ordered only for new tables in the manufacturing phase: 240 EUR

 

Elastomer-based Damping Plate for microscopes, universal, 60 x 40 cm: 910 EUR

 

Elastomer-based Damping Plate for microscopes, universal, 75 x 50 cm: 1560 EUR

 

 

   

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