Alan Hitchcox

Penton Media Inc.

Alan became a technical editor in 1981 and joined Hydraulics & Pneumatics in 1987. After serving in the US Army as a wheeled vehicle mechanic, he graduated with a BS in engineering technology from Franklin University, Columbus, Ohio, while working as an industiral service coordinator and project manager at an industrial distributor. He has taken technical courses in fluid power and electronic and digital control at the Milwaukee School of Engineering and the University of Wisconsin - Milwaukee and has served on several industry committees.

The most-powerful seal test bench in the world

Installed in a specially constructed well, an 18-ton, 260‑kW floating-mount rod seal test bench is located at Trelleborg’s research and development center in Stuttgart, Germany. The machine is capable of simulating the patterns of movements and stresses faced by hydraulic rod seals in some of the most-demanding rod-seal applications, such as aircraft landing gear, injection-molding machines, and mining excavators.

Machine Tool and Automation Show Scheduled for Milan, Italy October 2015
Organizers introduce general commissioner and information about the event.
Sensor detects piston position in accumulators
Simplified drawing explains operation of SL720 position sensor and shows major components. Hybrid hydraulic drives use accumulators to store kinetic energy from braking as hydraulic energy instead of braking a vehicle ...
Comatrol releases update to its EasyValve software
Comatrol has released an update to its EasyValve software, which is based on Famic Technologies' Automation Studio software platform.
Two new ISO Standards on quick-acting couplings now available from NFPA
International standards address dimensions and requirements for screw-to-connect quick-action couplings.
Bosch Rexroth set to sell pneumatics group
Bosch Rexroth announced that company officials have signed an agreement to sell its global pneumatics business to Triton Advisers Ltd., a European investment group.
Weight balancing conserves power
Weight balancing conserves power
Aluminum lightens bent-axis pump
Aluminum lightens bent-axis pump
Cat makes a big impact with its hybrid excavator
Hydraulics technology wins out over electric for hybrid drives in large excavators.
Brennan Adds Pressure Ratings To Mobile App

Brennan Industries ( recently expanded its mobile application, which now includes pressure ratings for more than 6,000 of the firm’s parts spanning 330-plus series. As part of the upgrade, the app includes pressure ratings in psi or bar units for numerous Brennan products, in addition to the ability for users to search for ratings by series or part number.

A pneumatic locomotive?

Pneumatics is often used where the potential dangers of electricity pose too great a risk for electrical power to be used. Equipment used in mines and submerged or standing in water are probably the most prevalent applications.

IFPE paper: how to make lemonade from lemons

Any form of power transmission has its advantages and disadvantages. I don’t have the space to elaborate here, but one of the knocks against hydraulics is pressure ripple. Pressure ripple is a fluctuation of pressure in a hydraulic system. Instead of putting out a constant flow of fluid, hydraulic pumps emit flow in surges. The frequency of surges is a function of the number of pumping chambers (cylinders, gear teeth, vanes, etc.) and the pump’s speed, whereas the severity (peak-to-peak magnitude) of the surges is a function of the pump’s design.

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