Save Money and Improve Productivity and Reliability with Pneumatic Actuators – Part Four

“A common goal throughout the business world is to increase productivity while reducing costs. This certainly applies to machine design, which means achieving the fastest possible cycle times. For pneumatic systems, this often requires running actuators as fast as possible without introducing excessive shock loads to the system.” This is the fourth and final post in series of blogs from Michael Guelker, product manager – pneumatic actuators, with Festo USA. This week Mr. Guelker will finish his discussion and summarize the advantages and disadvantages of using air cushions.

Self-adjusting cushion (pictured above):

This graph shows relatively constant deceleration, and thus gentle travel into the end position, resulting from the constant pressure curve.

The advantages of self-adjusting end-position cushioning are considerable. Manually adjusting the end-position damping of linear actuators is time- consuming and can only be done effectively once the actuator is installed and under operating load conditions. By then the automation supplier is invariably under pressure to complete the task as quickly as possible.

It also frequently involves two people – one to operate the appropriate pneumatic valve, the other  to adjust the actuator’s damping characteristics. As with all moving parts, access can be potentially hazardous, which means that safety considerations dictate that only experienced personnel should perform these adjustments. Actuators are often less than perfectly adjusted, with under-damping resulting in higher end-position impacts, higher noise levels and increased wear, or with over-damping resulting in increased machine cycle times. We can estimate that, on average, the self-adjustingend-position cushioning system will help users save five minutes from a cylinder’s installation and set-up time.  For a typical application, such as a package sorting system with 60 cylinder-driven routing stations, this would result in savings of five man- hours.   Self-adjusting end-position cushioning is a ‘fit and forget’ product feature.  Since it has no settings to change, it is completely tamper-proof and it offers a long, maintenance-free service life.

Without any need for manual interventions, self-adjusting cushioning now ensures an optimum cushioning action every time, even if parameters such as friction and pressure change. It also reduces the acceleration forces acting on components and work-pieces. This reduces wear and minimizes time- consuming vibration.

Advantages: no manual adjustment is required, responds automatically to load and speed changes.

Customers enjoy the following advantages:

•   Time saving (economy)

No need for manual adjustment of the cushioning.

•   Accessibility (convenience, economy)

Once cylinders have been installed, carrying out cushion adjustments in a confined area is often a problem.

•   Consistent cushioning quality (safety)

Self-adjusting cushioning always deliver the same optimum performance.

There are none of the variations that can occur with PPV when these are adjusted by different people.

Other arguments in favor of self-adjusting air cushioning

  • Cannot be varied by machine operator, which means no possible
  • Long service life, thanks to optimum cushioning setting, not only for cylinders but for entire
  • Optimum cushioning even with varying mass/pressure within permissible range.

Disadvantages: cannot be used when the cylinder is operated at its limits (heavy loads, very high or low speeds).

If you would like to see more articles like the ones appearing in this series please email me at


Subscribe to our mailing list

* indicates required

My company is a…

Recent Posts

NFPA Stats Toolkit: Latest Fluid Power Trends Updated – Get It Now!

NFPA’s Stats Toolkit allows NFPA members to see the latest trends in fluid power. This web-based tool houses Confidential Shipment Statistics (CSS) data along with economic indicators, customer market data, and forecast data. Users can create custom, downloadable reports through 5 report types: 12/12 Rate of Change (ROC): The latest trends suggest that fluid power…

Read More

March’s Quarterly Technology Conference – New Components and System Architecture that Increase Energy Efficiency

Registration is now open for the March NFPA Quarterly Technology Conference. The upcoming conference will take place March 2, 2023 and will be held jointly with FPIC. The conference focus is “New Components and System Architectures that Increase Energy Efficiency.” Presentations will be broadcast virtually over Remo.  Sessions will include: View the tentative schedule of events here and…

Read More

IFPE Preview: Unique Role that Distributors Play in the Electrification of Mobile Machines – Fluid Power Forum Episode 92 Now Live 

This episode features Jim Kaas, the President of IFP Motion Solutions, Inc. IFP is a distributor of hydraulic power units and automation systems. Listen to the Podcast Here IFP is NFPA’s Gold Sponsor, the highest level of sponsorship one can have within our organization. Jim is also Chair of the NFPA Board of Directors for…

Read More