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.

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Inductive Linear Position Sensor Handles Off-Road Challenges
The LR-27 series of linear variable inductive transducers from the Alliance Sensor Group, Moorestown, N.J., was designed to be rugged enough for use in off-road vehicles
Pallets Move on Customizable Conveyor 3
The new 2200 SmartFlex flexible chain conveyor platform from Dorner Mfg. can now be equipped with pallet-handling options to provide accurate positioning and routing of parts for assembly, robotic, and inspection applications.
Quarter-Turn Fasteners Prevent Lost Hardware
D5 DZUS panel Line quarter-turn fasteners from Southco use flare-in studs with all the fastening hardware firmly attached.
NASA Robot Spawns Biomedical Spinoffs
Humans doing difficult, repetitive tasks or those who need assistance with movement may soon get a helping hand, thanks to robotic technology developed to serve astronauts in space.
The Basics of Threaded-Forming Fasteners for Plastics 1
Tips on getting the right screw for plastics
Tips for Selecting Materials for Low-Temperature Seals 1
Which makes the best low-temperature seal: polyurethane, nitrile, polyacrylate, fluorosilicone, fluorocarbon, or silicone?
8 Stealthy Military Vehicles
By the 1970s, engineers had discovered how to build structures that were difficult, if not impossible, to see on radar.
Shape-Shifting Sensors Could Explore Inside Patients
Novel geometrically encoded magnetic sensors (GEMs), developed by researchers from NIST and NIH, respond to local biochemical conditions—such as a change in acidity near inflammation sites—by changing their shape and response to radio frequencies.
What’s the Difference Between Resistance-Welded Fasteners and Arc-Welded Studs?
Welding is often used to permanently fasten two pieces of metal together. Screws and nuts are the most common welded fasteners, but pins and unthreaded studs are often used as locating or bearing surfaces rather than fasteners.
How to Calculate the Torsional Stiffness of Rubber Shock Mounts
How to calculate the torsional stiffness of rubber shock mounts when all the company supplies are its radial and axial spring rates. Shock, awe, and vibration
GALLERY: Seven Aircraft from the Skunkworks 1
A gallery of aircraft that came out of Kelly Johnson’s Skunkworks at Lockheed Martin Corp.
Cordless Hydraulic Pump Provides Portable Power

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 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...

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