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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Roller bearings
Five Ways to Keep Roller Bearings Cool 1
There’s little or no need to be concerned about temperature rises on least not under “normal” operating conditions.
Calculating the Hidden Loads in Fasteners Near Edges 5
Fasteners installed near the ends or edges of load-carrying members often have hidden loads greater than the actual applied load.
Rolling-Ring Drives Now Have Adjustable Pitch 1
A pitch control lever lets users change the linear pitch of Amacoil's rolling-ring drives independently of the drive motor speed or other controls.
The Difference between Medial and Lateral, Proximal and Distal, and Superior and Inferior (Biomechanics)
There are a host of terms used by healthcare professionals and biomedical engineers to describe anatomical positions...
The Challenges and Promises of the Industrial Internet of Things 1
To get an idea of the challenges facing the Internet of Things, Machine Design talked with Dan Levine, CEO of CytexOne.
Force Calculations for Bolted Joints 1

Bolted joints are often tightened to 75% to 80% of bolt proof load. This amount of tightening, a rule of thumb, is suitable for many joints, but in some cases, external tensile loads can reduce bolt clamping force to zero.

Variables for Bolt Design
Here’s a list of variables used to define the characteristics of bolts and used in formulae and equations describing bolts and their behavior in joints.
Self-Clinching Nuts Leave Minimal Footprint on Ultra-Thin Stainless Steel 1
SMPP self-clinching nuts serve especially well in stainless-steel assemblies that have limited space for hardware attachments.
What Are the Differences Between Sprung and Unsprung Weight? 8
“Sprung” and “unsprung weight” are terms that are applied usually to automotive and truck suspension, though they are also applicable...
4 More Incredibly Over-Engineered Aircraft 7
As a follow-up to our recent image gallery, here are four more aircraft that have flown longer than most others. It could be because aircraft designers in the past tended to overdesign and use generous safety margins.
The FAA on Quadcopters 1
In addition to registering with the FAA, quadcopter owners should familiarize themselves with regulations regarding these unmanned aircraft.
Quadcopters Soar to New Heights
Quadcopters carry an extraordinary array of sophisticated equipment that makes them simple and fun to fly.
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.
IoT Emerge: The Woodstock for the Internet of Things By Stephen Mraz IoT Emerge: The Woodstock for the Internet of Things Read Now
Engineering Dead-Ends: A Gallery of Perpetual Motion Machines By Stephen Mraz Innovative Startups Call New Lab Complex Home Read Now

A Quick Look at Steels Used for Fasteners By David Zimmermann, A Quick Look at Steels Used for Fasteners Read Now

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