Stephen Mraz

Senior Editor,
Machine Design

Steve serves as Senior Editor of Machine Design.  He has 23 years of service and has a B.S. Biomedical Engineering from Steve was a Flight officer in the U.S. Navy. He is currently responsible for areas such as aerospace and medical.

GALLERY: Seven Aircraft from the Skunkworks
A gallery of aircraft that came out of Kelly Johnson’s Skunkworks at Lockheed Martin Corp.
Cordless Hydraulic Pump Provides Portable Power 1

The XC-Series cordless pump from Enerpac (, Menomonee Falls, Wisc., uses a one-half horsepower motor powered by a 28-V lithium-ion battery pack to get the performance an electric or pneumatic powered pump with the convenience of a hand pump. It is well-suited to remote locations or cluttered areas where another cord or hose would present a tripping hazard.

Smaller Stainless-Steel Temperature Sensor Fits Almost Any Application

Advances in technology and manufacturing have let engineers at TURCK (, Plymouth, Minn., design and build two new sensors, the EG05K and EH04K, that are only 15.2 mm long and 5 mm or smaller in diameter. This makes them the shortest M4 and M5 sensors on the market and they open new possibilities for machine builders, especially in the metals manufacturing and die stamping industries.

Selecting Fasteners for Thin-Walled Joints
Engineers need to consider more than just strength when choosing the right fastener for a thin walled joint. They must also factor in easy assembly, vibrational resistance, and maintenance
Taking a Closer Look at Medical Inhalers

Researchers at Argonne National Laboratory, Lemont, Ill., are taking the expertise they’ve acquired studying automotive fuel injectors and applying it to medical inhalers such as those used by asthma sufferers...

Biosensor Tracks Health by Looking at Sweat 2
A personal biosensor analyzes a soldier’s sweat to determine his health during training and missions.
Nanotubes Keep Drone Wings Ice-Free

Engineers at Battelle Memorial Institute, Columbus, Ohio, have tested their HeatCoat, a device for keeping ice off the wings and control surfaces of drones. It consists of a carbon-nanotube coating that can be sprayed on or applied in flexible sheets. Sending electricity through the panel or coated area generates enough heat to prevent ice from forming and break free any ice that has formed. A controller monitors weather conditions and heater performance, ensuring power is only used when needed.

New Nanosphere Material May Overcome Limits of Lithium Ions 1
A research team at Rensselaer Polytechnic Institute, Troy, N.Y., has developed a new material—cobalt-oxide meoporous nanospheres—that could overcome two of the major limitations of lithium-ion batteries.
Backscatter Diffraction Uncovers Removed Serial Numbers

Crooks trying to hide their crimes or identities by filing the telltale serial numbers and markings from firearms, cars, or bullet casings could soon have a new forensic technique to worry about: backscatter diffraction. Engineers at the National Institute of Standards and Technology (NIST) have found a way to use this technique to read the imprint of letters and markings that were stamped into metal, but then polished or ground off.

New Flow Battery Could Back-Up Local Grids, Power Cars and Trains 1
A new zinc-polyiodide redox flow battery developed at the Pacific Northwest National Laboratory (PNNL) has nearly the energy density of lithium-ion batteries, and is inherently fire safe.
Energy Dept. and NSF Plan Powerful Telescope and Camera for South America

The U.S. Energy Dept. and National Science Foundation (NSF) have finalized designs for the world’s largest digital camera. It will weigh 6,160 lb, be roughly the size of a small car (5.3  10 ft), and will take flat images that measure 25-in. in diameter and contain 3.2 gigapixels. The camera is planned as part of the large synoptic survey telescope (LSST) that the two organizations will construct 1.7 miles above sea level on Cerro Pachón, a mountain in Chile.

Shelby Cobra Recreated Using 3D Printing

Engineers at the Oak Ridge National Laboratory in Tennessee built a replica of the Shelby Cobra to celebrate the car’s 50th anniversary.

Self-Powered Keyboard Provides a Biometric Layer of Security

A self-powered keyboard developed at the Georgia Institute of Technology can charge up electronic devices and prevent unauthorized persons from accessing the computer.

Inventors Opt for Disclosure Over Secrecy 2
Inventors opt for disclosure over secrecy
Proper Surface Prep: An Adhesive’s Best Friend 1

Strong, long-lasting adhesion depends more than just selecting the right adhesive. It also requires that the best surface preparation techniques be used. In this context, “surface” refers to the area and depth where the adhesive interacts with the substrate. The affinity of the adhesive with this surface ultimately determines bond strength. Whether bonding metals, plastics, or rubbers, proper surface preparation always plays an essential role in getting the best bond.

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