Rotary Viscous Damper Temperature


Most applications requiring a rotary viscous damper must consider the temperature consequences. As the ambient temperature rises the damping fluid’s viscosity lowers and vice-versa when it gets cold. In applications that work in a range of temperatures we may take a different approach to achieve controlled damping. Multiple damping greases which complement each other when the units are exposed to temperature extremes is possible. Sometimes a combination of damping grease and springs can achieve success at high frequencies. In essence ambient temperatures need to be know when design a damper.Contact us at or 203-406-7900 for a free consultation.

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Slimline Friction Hinges


We have been involved in an aerospace project where space inside the cabin is at a premium. Our specific flavor of friction hinges is suited specifically for small doors, panels, lids and safety covers that cannot rattle around or pivot without someone physically moving them. When they are moved it is without any noise any can be placed in any position. So during take offs or landings, the won’t move from their position. All of our friction hinges are grease free and can have a full range of torque capabilities. Depending on the diameter and length we can achieve 1 through 40 in-lbs.  Larger is also possible. So please contact us for a free consultation at or 203-406-7900

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Linear Motion and Rotary Viscous Damping


Our rotary viscous dampers can provide damping for linear movement also. For example a cylinder needs to stop smoothly without jerking or banging, we can add a pivot arm to accept linear motion to rotate the damper. One way clutches can provide a way to reset the damper quickly , so it’s ready for another cycle.  We can incorporate gearing to change the ratio of stroke to damping rotation.  So our rotary viscous damper are flexible enough to be used as a linear motion braking system.  see us at or call at 203-406-7900.  We can meet your damping and friction hinge needs.

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MMT Friction Hinge Advantages


friction hinge

I would like to highlight some advantages of our friction hinge design. The materials we choose have been picked because of their specific mechanical characteristics when interacting with other materials. The difference between the peak static torque and dynamic torque is minimal, the reason for this is to achieve a very smooth motion profile which reduces stresses on mounting components made of plastic, such as laptop screen housings. We feel strongly that this feature is critical. The cost of broken laptop screens can be substantial. Another feature we design is a long cycle life. No lubrication is needed for our friction hinges. The characteristics of the mating frictional components have a coefficient of friction needed for the proper breakaway torque suitable for laptop screens and any other similar component you would like to pivot, we are not restricted to using this design technique for computers only. Industries like the medical field, energy, computer and industrial can use our friction hinges. Life cycles of 30,000 to 50,000+ with out failure are common. If you need a free consultation please contact us at 203-406-7900 or visit us at

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Rotary Viscous Damper: Marine Application


We have made a few designs for use in marine applications. The materials we use are impervious to saltwater and debris. The damping grease used is sealed internally and won’t lose functionality with immersion in water or in splashing situations. Typical applications could be port doors, hatches, cooler lids, pivoting panels, storage doors to name a few. Our Rotary Viscous Dampers are maintenance free, low profile and last for 30,000+ cycles. Friction hinges also can be made in the same materials as the Rotary Viscous Dampers, ensuring high performance. Prototypes and samples are available upon request. We can use 3D printing to make a functional prototype. So call us at 203-406-7900 or visit our website at, let us put our engineering experience to use for you.

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Rotary Viscous Dampers And Temperature


As a mechanical engineer reading this blog you should be aware of ambient temperature and it’s effect on the motion of a MMT rotary damper. We usually test the designs in a chamber setup to simulate the customers application. Even though we use a viscous compound that is very tolerant of temperature changes, exact changes in damping motion should be carefully examined to validate customers expectations. Also keep in mind, that structural components in the system are also affected. Metals and plastics expand and contract at extreme temperatures and we design with those temperature variables in mind. So if you have an application for a friction hinge or rotary viscous damper call us at 203-406-7900. Our website is

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Engineered, Designed and Manufactured in the USA


We have and always will be a US only company. It may be difficult to believe but it’s true and we intend to stay that way. Going to China is an un-necessary evil which will only create major problems in the future, especially IP (intellectual property) problems. As someone who is our customer this should be good news. All of our IP and any relevant trade secrets related to the technical aspect of our property is kept off the grid.  Due to the world-wide hacking issues we had no choice; this also protects any data transferred to Mechanical Motion Technologies from our customers. We remain vigilant in maintaining IP security and hope our customers understand the significance.  When you approach us for mission critical designs you can be sure it remains secure. We remain 100% on American soil and in-house for all critical aspects of design, testing and manufacturing. Please see us at for your next rotary viscous damper or friction hinge design. It is safe in our hands.

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Friction Hinges in Medical Devices


One interesting application for friction hinges and rotary viscous dampers is in medical devices. We have our products in Hospitals, doctors offices and care facilities.  Popular applications  include toilet seats, food service trays, fold down tables, infant care devices, centrifuges, bathroom safety equipment to name a few. we design devices so that no particulation or harmful out-gassing can occur in a clean room environment.  Tray and tables that need to fold up or down  but not slam or cause noise and injury can be another good application. So if you have a specific application you can call us for a free consultation at 203-406-7900 or go to our webpage at

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Rotary Viscous Damper with options


Pictured above is a rotary viscous damper with 2 added options which greatly add to the functionality. The two options are a one way clutch and a torsion spring. The motion is as follows rotating the grey member CCW is easy because the clutch is disengaged and the user only has to apply force to the torsion spring. When manually released the torsion spring reverses the force and engages the clutch and damping feature. This has many advantages, ease of opening , non slamming for safety, door will not vibrate when oscillations are applied, slimline design that is easily hidden and robust long life components that need no adjustment or maintenance.  A few applications can be furniture design, aerospace cabin design, waste receptacle lids, children’s furniture and automotive applications to name a few. We can provide a myriad of adapters to fit this style of damping hinge into different design.  Please contact us at for a free consultation.

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What are the Differences in Friction Hinges?


In a very basic sense a friction hinge is a mechanism which uses friction to impede rotation or movement of an object. This does not necessarily apply to pivoting about an axis alone, you can have a friction hinge that is a ball and socket type device which has more degrees of freedom. You can see friction hinges in devices such as toys and medical devices, they may look the same and seem to operate the same but the difference is in the engineering behind the performance.  The engineering quantities I am referring to are materials that take high stresses, consistent torque over millions of movement cycles, resistant to temperature, harsh chemicals and abuse. Usually in low cost, low cycle devices little thought goes into life cycles, but in a medical device or rugged laptop, engineering is everything.  So if you are designing a device that needs to have a high quality standard and you need good, consistent performance see us at


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