What’s the Difference Between Polypropylene Types?
Oct 1, 2018 · Polypropylene Homopolymer vs. Polypropylene Copolymer. Propylene homopolymer has a high strength-to-weight ratio, and is stiffer and stronger than the …
What Engineers Should Know about Zinc-Nickel Coatings
Feb 26, 2017 · Here is a brief summary of its benefits: Corrosion protection: As a true alloy, Zn-Ni coatings are proven to provide two to three times more corrosion-resistant protection than zinc …
What’s the Difference Between Bearing, Shear, and Tear-Out Stress?
Jul 1, 2016 · ASTM specifications for A325 and A490 high-strength bolts are to be tensioned to 70% of the minimum tensile strength. The table above shows this minimum bolt pretension for …
Basics of Aerospace Materials: Aluminum and Composites
Jun 19, 2014 · Aluminum matrix composites: Metal matrix composites (MMCs) consist of metal alloys reinforced with fibers, whiskers, particulates, or wires. Alloys of numerous metals …
What’s the Difference Between Spur, Helical, Bevel, and Worm …
Jul 30, 2015 · Helical gears have a smoother operation due to the angle twist creating instant contact with the gear teeth. The teeth on a helical gear cut at an angle to the face of the gear.
Cast Iron and Wrought Iron: What’s the Difference?
Jan 9, 2023 · Wrought iron consists primarily of iron with 1 to 2% of added slag, which is the byproduct of iron ore smelting, and is a mix of silicon, sulfur, phosphorous, and aluminum oxides.
Design Essentials: How to Convert from Rotary to Linear Motion
Mar 7, 2018 · A and B. The two mechanisms above are examples of slider-crank mechanisms. In addition, if high-speed rotation or operation for long hours is required, it is necessary to …
Making the Right Shaft Connections - Machine Design
Aug 1, 2000 · Keyed tapered bushings. A common device for attaching pulleys to motors, gearboxes, and shafts is a keyed tapered bushing, which is typically made of gray iron, steel, …
What’s the Difference Between Bearings? | Machine Design
Aug 26, 2015 · 2. The table above lists some general types of ball bearings and their typical load capabilities. Straight Roller Bearings. Straight roller or cylindrical bearings run in cylindrical …
Understanding the Nut Factor in Threaded-Fastener Torque …
Aug 18, 2009 · The long way Three of the most widely used long-form equations are shown below. The first equation was originally published in J. Bickford’s Introduction to the Design …
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