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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

 

Flatness error: +/- 0.25 mm per meter as maximum, along any straight line, 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. Please read the notes and warning below about using local air 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 "large" tables

 

The absolute pressure limits of the gas supply:

    2.5 Bar for the "small" tables

    7.5 Bar for the "large" tables

 

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

 

Membrane material in the working cylinders: fine and durable silicone

 

Height of the table top surface from the floor: 82 cm or more, depending on the thickness of the top plate

 

Weight of the leg system: approximately 120 kg

 

Weight of the top plate depends on the size. For rough estimation (based on the surface, width x depth): 170 kg / m2

 

Earthquake-proof. There is no greater test than an unexpected circumstance life throws in our way. In the afternoon on 18th January, 2017 there was an earthquake, magnitude of 5.7 in Italy. Two pieces of STable (©) Active Pneumatic Vibration Isolation Tables were operating approximately 120 km far away from the epicenter. Super resolution imaging processes was running on both tables (N-SIM on the first table and N-STORM on the other). We could feel the building shaking, but the imaging process was not disturbed, the picture quality remained excellent.

 

The internal structure of the top plate is a trussed rectangular crossbar structure (patented) made of welded carbon steel by default. As an option fully (even the internal structure) stainless steel top plate can also be ordered.

 

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 covered by dull stainless steel surface with no magnetic capability (optional magnetic fixing adapters are available). There are metric M6 threaded 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 you to compare the products of different manufacturers we have to emphasize a funny terminological fact. In the documents and websites of our competitors you can find alternative product names. There are some minor differences between them. However it is fascinating, but all these terms basically mean the same as Vibration Isolation Table. The frequently used synonyms are: 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.

 

 

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 worst case attenuation diagram of the STable (©) Active Pneumatic Vibration Isolation Tables, measured on the vertical axis. 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 then they were transformed off-line to the frequency domain.

 

This attenuation diagram was measured on an empty (nothing on the top plate) 98 x 66 cm Table. This is why the diagram shows the worst case situation. This statement means that in most of the real situations better performance can be measured than what this diagram shows. The corner frequency of the vibration isolator working cylinder is reciprocally proportional to the mass load on the working cylinder. On the one hand the bigger tables have heavier top plates. On the other hand there are always equipments installed on the top plate, increasing the total weight. The bigger mass results a lower corner frequency and as a result it gives better vibration attenuation performance above the corner frequency.

 

 

Active Pneumatic Vibration Isolation Tables (Small Size)

 

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

 

Thickness of the top plate: 110 or 170 mm (depending on the size).

 

Height of the top surface of the top plate from the floor depends on the thickness of the top plate. To compensate the flatness error of the floor, each legs are adjustable by +/- 2 cm. Below you can see the nominal heights:

 

Top plate thickness     Height of the top plate

   110 mm                       82 cm

   170 mm                       88 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 blueprint of the fixing holes on the granite plate should be received before starting the manufacturing process.

 

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 (Large Size)

 

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

 

Thickness of the top plate: 170 to 350 mm (depending on the size)

 

Height of the top surface of the top plate from the floor depends on the thickness of the top plate. To compensate the flatness error of the floor, each legs are adjustable by +/- 2 cm. Below you can see the nominal heights:

 

Top plate thickness     Height of the top plate

   170 mm                       88 cm

   210 mm                       92 cm

   250 mm                       96 cm

   280 mm                       99 cm

   310 mm                     102 cm

 

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

 

In the pictures below you can see a large table with the optional "Optical Hole Pattern" on the top surface. Optical Hole Pattern means M6 metric threaded holes are drilled in 25 x 25 mm pattern. All other 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

 

 

IVF Table

 

The IVF Table is optimized for In vitro fertilization. It is a slightly modified, task-oriented version of our standard STable (©) Active Pneumatic Vibration Isolation Table.

 

The special features of the IVF Table are:

- Size of the top plate is 980 x 660 mm.

- The whole top assembly is sanitizable and sterilizable.

- It has a stainless steel covered top plate without any hole on it.

- There are two arm rests, one on the front and one at the back side of the table.

- The arm rests are covered with stainless steel.

- There are two shelves lain on the arm rests. The shelves are made of special magnetic stainless steel. The shelves are slideable laterally on the arm rests, so they can be fitted to any microscope. The joystick units of the manipulators can be fixed on the shelves with magnetic stands. The front side of the shelves are covered with white plexiglas to provide a comfortably warm feeling for the hands of the user.

 

The leg system of the IVF table can be ordered in of the following two versions:

- With pneumatic leg system for the best vibration isolation performance.

- With elastomer-based isolators for a more budget-friendly solution.

 

        Click on the picture to get it in full size

 

The mechanical drawing of the smallest IVF Table is available for download in DXF and PDF format.

 

 

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 "large" 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 About the Quiet Air Compressor

 

Quiet Air Compressor must always stand top side up! Quiet Air Compressor must not be tilted, because the internal lubricant oil would flow out on the tube connectors.

 

Quiet Air Compressor is not a 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 worktime 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 supply 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! That is, why you should inspect the Quiet Air Compressor periodically.

 

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.

 

 

Using Central Air Supply

 

It is much more secure to operate an Active Vibration Isolation Table from a Quiet Air Compressor, because the output pressure of the Quiet Air Compressor is controlled by its internal pressure regulator. It must never be higher than the absolute pressure limits of the gas supply (given at the Technical Specifications paragraph). On every output connection point of the central air supply of the building there is always a pressure regulator installed. But that regulator is manually adjustable and can be turned up accidentally up to 8 or 10 Bar. The silicone rubber membranes of the table will immediately blow up above 2.5 Bar (or 7.5 Bar for the "large" tables)! We suggest you to use the Quiet Air Compressor as air supply in the system for the sake of the Table.

 

If you even decide to use the central air supply, please specify this fact in the order and we will provide the necessary safety adaptor for you.

 

 

"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 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 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. The default thickness of the "Optical" breadboard is 40 mm.

 

It must be emphasized, that a breadboard alone has no good enough bending and torsional rigidity. It is intended to be used on a stable surface (like top plate of a vibration isolation table). Basically the rigidity is the difference between a top plate and a breadboard.

 

        Click on the picture to get it in full size

 

 

Double-Storied (Dual Layer or Two Decker) Top Plate

 

A dual layer table is a usual active pneumatic vibration isolation table, but there is a smaller second "optical" breadboard 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 deck, on the higher "optical" breadboard. This is the reason, why the second deck is usually smaller than the top plate itself.

 

Double-Storied Top Plate can be added to any STable (©) Active Pneumatic Vibration Isolation Table. Double-Storied 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.

 

    Click on the picture to get it in full size

 

 

Vertical Spinning Disk Adaptor

 

Vertical Spinning Disk Adaptor is an "optical" breadboard, assembled vertically above the top plate of the STable (©) Active Pneumatic Vibration Isolation Table. There are two strong pillars assembled to the sides of the top plate. These pillars hold the "optical" breadboard assembled vertically above (and a bit behind) the microscope. This very strong assembly is able to hold a heavy equipment (e.g. spinning disk) connected optically to the microscope. For the default measures of the Vertical Spinning Disk Adaptor for a 122 x 76 cm vibration isolation table, please look at these sheets.

 

 

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

 

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

    Nominal Mass Load: 300 N

    Absolute Maximal Overload: 600 N

 

Elastomer-based Damping Plate 75 x 50 cm

    Height: 90 mm

    Nominal Mass Load: 500 N

    Absolute Maximal Overload: 1 kN

 

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 in stock for fast delivery. All of them are Active Pneumatic Vibration Isolation Tables. Examples of these sizes (with default top plates, without "optical" hole pattern, without Quiet Air Compressor 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: 7016 EUR

 

IVF Table 980 x 660 mm with elastomer-based vibration isolators: 2770 EUR

IVF Table 980 x 660 mm with active pneumatic vibration isolators: 3630 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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