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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10 Tips for Leak-Free Gaskets
Gaskets usually stop liquids, often under pressure, from leaking out or getting in through the cracks...
Knob-Style Captive Fastener Provides Tool-Free Access
The new 4C Wing Knob captive screws from Southco, Concordville, Pa., can be quickly installed or removed by hand.
Singulator Gets Parcels and Packages Organized
The increasing amount of goods being sent by online retailers—not to mention the Post Office—is putting a premium on fast, accurate sorting of boxes, parcel, flats, totes, and sealed bags.
Bicycle spoke
Coatings and Platings for Protecting Steel Wire
One of the most commonly used forms of steel is wire. But all those steel-wire products would have short lives if they weren’t protected against the elements
Accurately Calculating Spring Heights 4
Most textbooks and guides do not clearly distinguish between types of helical compression springs when giving equations for solid height of the spring. Fortunately, exact values of solid height...
What are the Differences Between Various Nickel-based Metals and Alloys?
Nickel alloys are used extensively in industry due to their resistance to corrosion and ability to withstand high temperatures and pressures.
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
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...
Engineers Assemble! Blog
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