Inertial Mass and Pneumatic Air Isolators in Cradle CMM Vibration Isolation System

Ensuring Uncompromised Precision: The Synergistic Power of
Inertial Mass and Pneumatic Air Isolators in Cradle CMM Vibration
Isolation System
The incorporation of inertia mass in conjunction with pneumatic air isolators
plays a pivotal role in augmenting the vibration isolation of CMM
(Coordinate Measuring Machine), providing a multitude of advantages that
greatly enhance the precision, consistency, and dependability of
measurements.
This combination synergistically enhances vibration absorption, stability,
resistance against resonance effects, and the overall performance of the
isolation system in precision measurement conditions.
Coordinate Measuring Machines (CMM) are widely employed in various
industries, including manufacturing, automotive, medical device
manufacturing, electronics and semiconductor manufacturing, precision
engineering and tooling, research and development, quality control and
inspection, and metrology. Their primary purpose is to verify the
dimensional accuracy of manufactured components.
Dynemech Pneumatic Isolators, DMAS series, with self-levelling
Pneumatic isolators are specifically engineered and extensively employed
to reduce the transmission of vibrations from the surrounding environment
to the CMM.

The working principle
pneumatic isolators use air pressure to generate a cushioning effect
between the coordinate measuring machine (CMM) and the
supporting structure. This successfully isolates the CMM from
external vibrations, preventing their transmission.
DMAS Series pneumatic isolators have air chambers that absorb
and dissipate vibrations. These pneumatic isolators serve as a low
friction interface, enabling the CMM to float on a heavily damped
medium.
Frequency Range:
Pneumatic isolators, DMAS series, effective at both lower and higher
frequencies (The isolation starts typically above 2.5 Hz).
However, they provide limited isolation at lower
frequencies (below 2.5 Hz).
At frequencies close to their resonance frequency, they amplify
vibrations , around 1.5 Hz
Inertial mass:
Purpose : Addition of the inertial mass to the CMM structure strategically
improves its stability and decrease its susceptibility to external vibrations.
Mechanism:
By increasing the mass of the Coordinate Measuring Machine (CMM),
its sensitivity to rapid vibrations or disturbances is reduced.
Essentially, it opposes changes in acceleration due to its inertia.
By lowering the total centre of gravity of the CMM isolator system, it
decreases the system's inclination to oscillate at resonant
frequencies.
The suspended cradle frame effectively manages the rotational and
rocking vibrations by aligning the vertical centre of gravity of the
isolated CMM system with the centreline of the isolator.
By increasing the mass of the vibration isolation system, the natural
frequency of the system is reduced, hence improving its capacity to
successfully isolate low-frequency vibrations found in the precision
measurement environment.
Impact: The inclusion of additional mass reduces the intensity of
vibrations, leading to enhanced precision and repeatanility in
measurements. It serves as a protective barrier against external
influences. An inertia base serves as a rigid and stable support for the
isolated equipment to be placed on.
Combined Impact on CMM Vibration Isolation:

1.Enhanced Vibration Absorption and Stability:
The integration of air isolators with inertia mass results in a very efficient
vibration isolation system capable of successfully absorbing and dispersing
vibrations over a broad spectrum of frequencies. The air isolators offer
exceptional isolation for vibrations with high frequencies, while the inertia
mass improves the system's effectiveness in the low-frequency range.
2 . Resilience Against Resonance Effects:
Resonance effects have the potential to disturb measurement procedures
and result in inaccuracies in CMM readings. The integration of inertia mass
with pneumatic isolators aids in reducing these effects by adding extra
mass to counterbalance vibrations caused by resonance. This resilience
ensures that the CMM remains unaffected by resonance, resulting in more
reliable and consistent measurement outcomes.
3. Broadened Frequency Range:
The inclusion of both inertia mass and pneumatic air isolators increases
the range of frequencies at which the isolation system may effectively
reduce vibrations. Consequently, the CMM is capable of functioning in a
wide range of production settings that have different vibration
characteristics, guaranteeing reliable protection from external disruptions.
4. Improved Accuracy, Repeatability, and Reliability:
The integration of inertia mass with Dynemech pneumatic air isolators
efficiently isolates the CMM from external vibrations, ensuring that the
highest standards of dimensional accuracy are maintained. The minimized
transmission of vibrations reduces distortions and positioning errors,
ensuring that the sensors and probes of the CMM can accurately and
consistently record measurements.
To summarize, inertial mass enhances stability and decreases sensitivity to
oscillation, while pneumatic isolators mitigate vibrations and safeguard the
CMM from external disruptions. By utilizing the concepts of additional mass
and air cushioning, Dynemech engineers can successfully isolate CMM
systems from external disturbances, guaranteeing the precision and
dependability of their measurements, ushering in a new era of meticulous
engineering.

Contact:
Dynеmеch Systеms Pvt Ltd.
Mob: +91-9810760131 ; +91-9911145131
Email: Salеs@dynеmеch.com
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