Standa 1VIS10 User manual

P.O. Box 2684
03001 Vilnius, Lithuania
Phone: [phone]
Fax: [phone]
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Manufacturer of Opto-Mechanical equipment for research, industry and education http://www.standa.lt
Vibration isolation system 1VIS10
User manual
Standa
2018

P.O. Box 2684
03001 Vilnius, Lithuania
Phone: [phone]
Fax: [phone]
E-mail: [email protected]
Manufacturer of Opto-Mechanical equipment for research, industry and education http://www.standa.lt
2
Table of contents
1. General information
1.1. Introduction
1.1.1. Safety
1.2. Location of the table
1.3. Air supply requirements
2. Mounting of the system
2.1. Assembly of the system
2.1.1. Safety
2.1.2. Assembly of the frame
2.1.3. Connection and installation of pneumatic vibration isolation components
2.1.4. Fitting the collector and the support plates
2.1.5. Assembly of the table
2.2. Preparation of the system for operation and vibration isolation of the table
2.2.1. Assembly of level controls
2.2.2. Connection of air supply pipes
2.2.3. Setting of level controls
3. Management of the system
3.1. Main principles
3.2. Adjustment of parameters of the system
3.3. Maintenance
3.3.1. Cleaning
3.3.2. Air quality
4. Packing list

P.O. Box 2684
03001 Vilnius, Lithuania
Phone: [phone]
Fax: [phone]
E-mail: [email protected]
Manufacturer of Opto-Mechanical equipment for research, industry and education http://www.standa.lt
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1. General information
1.1 Introduction
The pneumatic vibration isolation system is an ideal work platform for equipment, which is
sensitive to vibration, e.g. microscopes, scales, interferometers, and similar devices.
The work surface of the table is separated from the floor by means of a highly effective system
of pneumatic supports.
The system features solid and light optical tables of different sizes, which enable the production
of a wide selection of systems for a variety of tasks requiring different sizes and loads
Specification
Symbol
Value
Unit
Vertical movement range
lz
14
mm
Precision of automatic level control
Δ lz
± 0.3
mm
Pressure from source of air
p
600 (6 bar) (87 PSI)
kPa
Air supply opening
Ø
6
mm
Operating humidity (max)
φ
90 %
%
Operating temperature range
T
10 - 50
ºC
Load-bearing capacity (at 6 bar) per isolator
Q
160
kg
Fig. 1. Specification of 1VIS10
A specification of a pneumatic support is presented in fig. 1.
Although each support is intended for a load of up to 160 kg, you should prevent overloads of
the table at the edges, otherwise any one pneumatic support may become overloaded even if the total
weight fits within the limits set. Loads with the centre of gravity located very high may result in
instability of the entire system. Please refer to section 3.2 of the manual.
The system is managed by means of level controls; there are 3 controls per system. Please see
fig. 3.

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Fig. 2. Level control, model 1LV-1WM
* Optional.
** An overpressure relief valve can be provided.
1. Precision of level setting: ± 0.3 mm.
2. Materials:
Body and lever: anodised aluminium, brass, steel, plastic.
A typical vibration isolation system is shown in fig. 3.
Fig. 3. A typical vibration isolation system

P.O. Box 2684
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1.1.1 Safety
This manual uses certain terms that are important for your safety.
Warning
Used to denote a danger that may result in injury.
Attention
Used to denote a situation that may result in damage to components of the system.
1.2 Location of the table
To ensure optimal operation of the system, it must be installed on a surface that satisfies certain
requirements.
The surface must be even.
It is important that an appropriate location for the system is chosen. The system must be installed
in the vicinity of bearing walls or columns, where the impact of low-frequency oscillation is smaller.
Furthermore, it is advisable to avoid placing the system in the vicinity of other sources of vibration such
as elevators, ventilation systems, industrial equipment, and airflows.
Warning
The system is a metal-made current conductor. If used together with electrical devices, the
table must be earthed.
1.3 Air supply requirements
The operation of the system requires a constant supply of air. After the system has been filled in
and set, air is used only for the operation of level controls when the load on the table changes.
Compressed air tanks (receivers) may be used for keeping the system operative.
The air supply should be clean and dry for the best long-term results. The filtering degree must be at least
10 µm. The filter prevents impurities and water from entering the level controls, thus preventing them
from clogging.
The working pressure of the system is The required minimum working
pressure for the support with the maximum load may be computed using the following formula:
Where:
Pmeans the required pressure in atm (bar).
Qmeans the load on the support with the maximum load including weight of the table top (kg).
Example:
Q= 100 kg

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The air supply system must be provided with a valve (plug) for a complete stoppage of air
supply in the case of maintenance and/or resetting of the system, or in cases of major changes in loads
of the system.
Attention
It is not advisable to use compressed carbon dioxide (CO2) tanks because rapid filling of
pneumatic supports may result in their icing up.
2. Mounting of the system
2.1 Assembly of the system
2.1.1 Safety
The weight of the optical table could reach 100 kg. For this reason, to prevent injuries during
assembly of the system, lifting mechanisms (a loader) and technological supports must be prepared in
advance.
2.1.2 Assembly of the frame
Assembly of the frame is shown in fig. 4.
Attach the brace into the leg assembly by M10x120 screws through the washers.
Screw the solid leveling elements into the leg assembly.
Fig. 4. Assembly of the frame

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2.1.3 Connection and installation of pneumatic vibration isolation components
Insert the pipes, through the hole for air
supply pipe, into the collet fittings until tight. Pull
the pipes accurately to make sure that the
connection is secure.
The length of the pipes between the fittings
must be optimal with a small extra length.
Warning
Cut the edges of the pipes using a sharp
cutter at a straight angle. It is not advisable
to use scissors because deformation of the
pipe edges may lead to leaks from the
system.
Attach the pneumo isolation element to the
leg assembly by M6x10 screws through the
clamps.
Fig. 5. Connection and installation of pneumatic vibration isolation components

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2.1.4 Fitting the collector and support plates
Attach the collector to the leg assembly by
M5x30 screws.
Insert the hex key 3HK-5 into the hole of the
piston and hold it, so that the torque moment
doesn’t transmit to the diaphragm.
Attach the support plate to the piston by
M6x16 screw.
Fig. 6. Fitting the collector and the support plates

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2.1.5 Assembly of the table
Place the table accurately on top of the
pneumatic supports. If you need to adjust the
location of the table, lift the table over the
supports.
Fig. 7. Assembly of the table

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2.2 Preparation of the system for operation and vibration isolation of the table
2.2.1 Assembly of level controls
A level control is shown in fig. 2.
All systems, regardless of the number of pneumatic supports used in them, are provided with 3
level controls that form a triangle. The greater the triangle of a specific optical table is, the more stable
is the operation of the system. If 2 or more pneumatic supports are controlled by means of a single level
control, then they operate as one large support with the total load-carrying capacity applied to the centre
of the shape formed by the pneumatic supports. Groups of pneumatic supports serve as three supports
for the system. The aggregate centre of gravity of the optical table and of the useful load present on the
table must be within the boundaries of the triangle formed by force centres.
Scheme of connection of level controls is shown in fig. 8.
After placement of the table, level controls must be fastened to the supports as shown in fig. 9
and in fig. 10.
Attach the plate to the leg assembly by M5x10 screws.
Attach the level control to the plate by nut plate (fig.9).
Align the controls horizontally and set the distance from the bracket of the controls to the table at
10 to 11 mm. The control screw of the lever must be set to the bottom position. The needle valve must
be turned clockwise until it closes. Tighten the two mounting screws carefully.
Fig.8. Scheme of connection of level controls

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Fig. 9. Installation of level control
Fig.10. Installation of level control

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After placement of the three controls the system must look as shown in fig. 9.
Fig. 11. Vibration isolation system
2.2.2 Connection of air supply pipes
Connect the air supply pipes as shown in fig. 8 as well as in the pneumatic connections scheme
that is supplied together with the system.
Warning
Cut the edges of the pipes using a sharp cutter at a straight angle. It is not advisable to use
scissors because deformation of the pipe edges may lead to leaks from the system.
Insert the pipes in the collet fittings until tight. Pull the pipes accurately to make sure that the
connection is secure.
The length of the pipes between the fittings must be optimal with a small extra length.
Place the tubes along the braces system and secure them with holders of quick installation (fig.
11)
Connect the air supply and set the pressure control based on the computation of its value carried
out in advance according to the formula provided in section 1.3.
Attention
The pressure in the system may not exceed 6 bar.
Check all accessible connections for possible leaks. Eliminate any leaks established prior to
starting further operation.
When the air starts to flow from the air supply to the pneumatic isolation system, open the needle
valves of the level controls.

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If the table does not start to float in a few minutes, increase the air pressure, check whether the
needle valve is open and try to adjust the position of the control lever by turning the control screw
clockwise.
Note
If the table starts oscillating after emerging, decrease the air pressure in the system and adjust the
needle valves by turning them clockwise.
2.2.3 Setting of level controls
When the system is completely floating, check the distance between the plate and the support
(see fig. 12). Dimension B must be (7 ± 1.5) mm. Set height B of every control by means of the control
screws. When all controls are set, check all three dimensions B once again and adjust them, if needed.
Fig.12. Installation of level control
Make sure that the table is floating freely on the supports. Move the table accurately from side to
side by approximately 3 mm. Perform the same operation by moving the table up and down by the same
distance. The moving of the table must be unimpeded and must not produce any noises.
Press each of the angles of the table one after another for approximately 3 mm and then release
the pressure. The table must return to the original position in approximately 3 to 4 seconds. Adjust if
necessary by means of the needle valves and pressure in the system.

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3. Management of the system
3.1 Main principles
After completing the assembly of the system and once the table has emerged, minor changes
may be introduced based on individual requirements for the system. These adjustments include
parameters such as air pressure in the system, position of the level control lever, and setting of the
needle valve.
Warning
After the table has emerged, the space between the table and the support may become a
zone of danger.
Any object present in this zone may be squeezed in the case of changes in the load on the
table or in the pressure, which can result in injuries.
3.2 Adjustment of parameters of the system
If a load has a high weight centre, the table may start to oscillate. In this case, you need to reduce
the pressure in the system and close the needle valve. This will improve the stability of the table. The
empirical rule to determine the height of the weight centre is shown in fig. 13. The system can be in
three different modes –stable, may be stable and unstable, depending on the position of the weight
centre. If the overall weight centre is outside of stable and may be stable areas, the system will lack
stability.
Fig. 13. Empirical rule for the determination of the height of the weight centre

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3.3 Maintenance
If operated correctly, the pneumatic vibration isolation system needs minimum maintenance. As
a rule, the maintenance includes the assurance of the cleanliness of the air supplied, i.e. replacement of
the filter and removal of any water.
3.3.1 Cleaning
The table and other parts of the system may be cleaned using a non-abrasive liquid detergent.
3.3.2 Air quality
Oil, water or impurities contained in the air entering the system may clog level controls and
worsen the operation of the system. Use of air treatment filters is obligatory. Please refer to section 1.3.