- Available Certified ISO Grade Designs: ISO 8
• Certified ISO Grade Design: ISO 8
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1580-PP-01
1580-PP-01 71913
Granite Isolators
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Features & Benefits
Products Tailored to Your Cleanroom Environment
Provide Terra with your desired ISO Grade™ design. We will tailor the product to meet your criteria and certify it with a report appended to your invoice. Certificate includes all the necessary information to streamline audits and facility compliance.
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Frequently Asked Questions
Q. What is the most cost-effective Granite Isolator platform for my application?
A. Please refer to the selection guide in Applications (Granite Isolator | Applications and Benefits) and Products (Granite Isolator | Standard Products) to choose the Granite Isolator size and load capacity that fits your application.
Q. Can I stack two Granite Isolator platforms to obtain even better vibration attenuation?
A. Yes, this is very effective and is referred to as a "two-stage" vibration isolator. For example, placing a 13x15 inch platform (70 lbs capacity) on top of a 16x21 inch platform (140 lbs. capacity) would support a maximum load of 70 lbs. and be very effective at reducing vibration. Similarly, putting two 16x21 inch platforms (140 lbs capacity) on top of each other would give a capacity of 100 lbs. and would also be very effective at reducing vibration levels.
Q. How long does it take to set up the Granite Isolator platform?
A. Unlike installation and handling of an air vibration isolation table, set-up of the Granite Isolator is quick and easy. It consists of sliding it under the microscope, precision scale, etc. and takes only a few minutes.
Q. Does the Granite Isolator have a "service life" and is any maintenance required?
A. Long-term reliability is assured because there is nothing to adjust or maintain. The Granite Isolator is highly reliable because it consists of only a granite mass on compliant supports. There are no air bladders, seals, or air valves that require maintenance over time.
Granite Isolator™ Theory of Operation
A vibration isolation device can be represented as a simple mass and spring system. This device is placed between the table top and the microscope.
The table top is always moving, and the goal is to prevent as much of this vibration as possible from reaching the microscope. We do this by the use of the vibration isolator which is schematically shown in the diagram. It consists of a mass, a spring that supports the mass, and damping that we describe below.
It is intuitive that the more mass (weight) one has in the vibration isolator, the less it will shake. It will simply tend to move less when the table top vibrates.
And the softer the spring on which the mass rests, the better the isolator will work. Damping is "friction" or a dashpot that absorbs energy as the table top vibrates. Damping is useful to reduce vibrations around the resonant frequency of the vibration isolator.
Granite is an ideal mass for a vibration isolator as it is heavy and has good stiffness and internal damping properties. It has been used for generations in anti-vibration tables and instrument bases. In addition, it can be attractive underneath the microscope.
The silicone gel supports used on the Granite Isolator make ideal "springs" as they are very compliant and have a high level of built-in damping. In addition, they are effective over a wide range of loading conditions. And they are long-lived, as units over 10 years old still retain their resilience and robustness. We have tested a number of soft elastomers, and this gel significantly outperformed all the rest due to its softness and high internal damping.
A potential problem with silicone is that it is one of the most difficult polymers to bond to. But we have developed a proprietary 12 step bonding process that bonds the silicone to the granite and the plastic with a strength that is higher than the silicone itself.
Granite Isolator™ Applications
The Granite Isolator™ is a widely used vibration isolation platform for microscopes, precision weighing scales, lasers, electro-optic systems, micropositioners, precision measuring instruments and Silicon wafer inspection stations to name a few. Applications include the following:
- Aerospace/Defense
- Building and Construction
- Coordinate Measuring Machines
- Foundation Isolation
- General Industry
- Heavy Industry
- Inspection Instruments
- Marine Technology
- Metal Working
- Music Industry
- Micro-hardness testing
- Microscopy
- Photonics/Robotics
- Power Generation
- Precision Equipment
Granite Isolator™ Benefits
- Simple and effective vibration isolation.
- Reduced eye fatigue compared to no vibration isolation.
- Compared to an air vibration isolation table, the Granite Isolator is significantly less expensive and does not require an air supply.
- Installation and handling is easier than an air vibration isolation table which can be quite heavy. The 13 x 15 Granite Isolator weighs just 24 lbs. Set-up consists of simply sliding the Granite Isolator under the microscope or precision scale.
- It is reliable because the Granite Isolator consists of only a granite mass on compliant supports. No air bladders, seals, or air valves that can run into problems over extended periods of time. Long-term reliability is assured because there is nothing to adjust or maintain.
- Cleanroom compatible. There are no moving parts, no air valves that have been known to send bursts of particle-laden air into the cleanroom. Granite is very abrasion resistant and an ideal cleanroom material.
- Much smaller and lower profile than air tables or benchtop air platforms.
- If the center of gravity of the microscope is too high, benchtop air isolation platforms can run into problems such as tilting too much or bottoming out on the isolators on one side. This problem is often solved by making the air isolation platform much larger than the microscope base. Unfortunately, this wastes useful table space. The Granite Isolator does not need to be significantly larger than the microscope base.
Although the Granite Isolator platform does not isolate from vibration as well as an air table, it is well suited for the 200x to 1000x objective magnification range. Higher magnifications should continue to use air tables.
Note however that air tables can also be used with the Granite Isolator platform for better vibration control than obtained with air isolators alone.
Custom Designs
Design of custom products require consultative efforts and we have a strong, dedicated team devoted to solving the most difficult vibration isolation problems.
We use all the best modeling and test technology including: Statistical Energy Analysis, Finite Element Analysis, Boundary Elements, 3D CAD, model analysis, dynamic and static testing for applications in many industries.