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.

DoD tests nuclear-delivery system
Technicians at Sandia National Laboratory tested a B61-11 ground-penetrating bomb built to deliver a nuclear weapon by dropping it from a hoist onto a concrete target.
Connectors simplify circuit-board production

The Han-Fast Lock circuit-board connector from Harting North America, Elgin, Ill. makes it possible for technicians to join Han connectors to circuit boards without adding components or soldering.

Gear series expands with high-torque low-backlash units

Engineers at Stober Drives Inc., Maysville, Ky. have added two smaller sizes to the company’s line of Servo-Fit PHQ gear units.

Happy Engineering Week 2014!

The third week in February (Feb. 16-22) will be National Engineers Week, a celebration of engineering started by the National Society of Professional Engineers back in 1951. NSPE timed the week to coincide with founding father George Washington’s birthday. Based mainly on his surveying work, Washington is considered by some to be the first U. S. engineer.

Microdevice can measure attograms
Microdevice can measure attograms
Roller-pinion drive positions fast-moving plasma cutter
Roller-pinion drive positions fast-moving plasma cutter
Computational fluid-dynamics (CFD) keeps operating rooms clean

Roughly 290,00 patients every year contract infections while undergoing surgery, according to the Centers for Disease Control and Prevention. Those infections cost billions of dollars in health-care services and 13,000 lives annually.

Reengineering a movie

RoboCop is considered a sci-fi film classic. It has spawned two cinematic sequels, a pair of TV shows, and two animated series, as well as several video games. Its upcoming remake (opening next month) presented the filmmakers with a host of challenges and opportunities to give the film a fresh new look and feel. Updating some of its special effects was similar to a large engineering project, forcing filmmakers to balance costs and time against the realism, quality, and goals of the picture — not to mention the safety of the cast, crew, and equipment.

Wheel uses beam and spokes instead of inflatable tube 1
Engineers at Michelin headquartered in France, have designed and built a single unit, the Tweel, which can replace the wheels on skid-steer vehicles used in construction, landscaping, and agriculture. It needs no air pressure, so there's no valve assembly, and the tire and wheel are combined in one component. It consists of a shear beam wrapped into a circle to carry the tread and is connected to a rigid, metal hub by deformable polyurethane spokes.
Simulating a safer, higher-performing tire for mining
There's an enormous challenge in designing the right tire for large-wheeled vehicles used to haul coal and other materials in underground mines.
LEDs provide true-to-life color for operating rooms
LEDs provide true-to-life color for operating rooms
Rugged gearboxes and motors keep conveyors moving at a Montana coal mine
Rugged gearboxes and motors keep conveyors moving at a Montana coal mine
Darpa explores membrane telescope for spying on Earth
Darpa explores membrane telescope for spying on Earth
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