Stephen Mraz

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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Articles
Radial and Orbital Riveting Add Finesse to Fastening, Joining
Knowing where and how to apply pressure is more important than brute force for these two riveting techniques.
What’s the Difference Between the Elastic Modulus and Kinetic Modulus?
How the elastic modulus fits into the kinetic modulus.
Microalloying Strengthens Steel
Adding small amount of alloying elements can dramatically boost the strength and hardness of carbon steels.
Calculating the Proper Preload for Threaded Fasteners 3
One of the most critical factors when it comes to reliability of a threaded-fastener joint is preload—the force the tightened fastener exerts on an assembly.
Pneumatic Cylinder Designed to Stay Clean
With an eye on hygiene, Aventics' new mini pneumatic cylinder was designed using roll-in geometry for its cover to prevent dirt accumulation.
Sensor Leverages Thermodynamics to Measure Gas Flows 2
MEMSIC's MFC2000 series gas flow sensor measures up to 70 liters per minute of gas flow with a minimal pressure drop.
Hardware for Electronics and PCBs
When building circuit boards and electronics, fastening and connecting hardware is often selected more because it's handy than because it's the best choice. Here's a look at some hardware and tips for getting the most out of them.
An Alternative for Fitting Straight Lines to Data
The “method of least squares” isn’t the only way to draw straight lines through data points.
Doing Rivets Right 1
If engineers choose the wrong rivets or install them improperly, the advantages of low-cost and rapid assembly go right out the window. Factors that influence rivet performance include shank length and diameter, location and hole, and workpiece preparation.
Compact, Electric Cylinders Lower Costs
The EC1 Linear Positioner from Kollmorgen, Redford, Va., has a maximum stroke length of 200 mm and delivers thrusts of up to 150 lb. at 13 ips.
Tips for Making Shapes Out of Cold-Drawn Steel
Ideally, parts should have a central bulk rather than some extensions or excessive peripheral areas. Here are some examples of the shapes to avoid.
Lead Screw Uses Plastic Nut to Eliminate Lubrication
Lead screws from igus, Providence, R.I., use high-performance self-lubricating plastic material nuts, eliminating the need for lubrication and making the motion-control devices suitable for clean rooms and other hygienic environments.
What’s the Difference between ZigBee RF4CE and ZigBee Green Power?
ZigBee 3.0, a low-cost, low-power wireless mesh-network standard, has several subsets such as ZigBee RF4CE and ZigBee Green Power.
What’s the Difference Between Direct and Indirect Drives for Hydraulic Pumps?
Engineers and designers commonly use electric motors to power hydraulic pumps. In some cases, the motor and pump are set up in a direct drive configuration. In others, they are connected using an indirect drive. Here’s a look at each drive type.
4 Tips for Stronger Blind-Rivet Joints 2
When using blind rivets in product design, engineers need to pay close attention to these four over-arching rules.
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