Monday, February 18, 2019
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Understanding the different types of heat treating

In the last article, we discussed many different types of annealing, and the reduction of distortion by application of stress relief annealing. In this...

Q&A with Mike Finn

What are your responsibilities with Mazak? I work in applications engineering. We work with customers to basically size a machine or select a machine appropriate...

Clever sampling techniques highlight AMS aircraft quality testing

In this edition of Materials Matter, we review the sampling and test piece production required for the AMS aircraft quality (AQ) testing methods specified...

Heat-treating gears improves surface durability

A common question asked of gear manufacturers by their potential customer is, “Is this gear strong enough for my application?” Without qualifiers, this question...

Q&A with Mary Ellen Doran

Your position is fairly new. What happened in the industry to move the creation of that position forward? It was a board directive as part...

When someone gives you the shaft

Did you ever have someone “give you the shaft”? This insult is defined as ignoring or putting someone down. In gearing, giving you the...

AQ (aircraft quality) testing requirements

Much has been written about the critical nature of steel cleanliness as it relates to the performance of highly stressed, cyclically loaded gear components....

Understanding different types of heat treatment: Annealing

In the last few installments we discussed the use of  Time-Temperature-Transformation and Continuous Cooling Transformation diagrams to understand the phase changes that occur during...

Continuous Cooling Transformation Diagrams

In the last column, we discussed the construction and application of Time Temperature Transformation or Isothermal Transformation diagrams. It was shown how these diagrams...

Q&A with Pawel Naporowski

What does New England Gear bring to the table that makes it unique among other gear industry companies? New England Gear is approaching its 25th...

The key to a proper fit for keyways

Did you ever have someone tell you that you cannot fit a square peg into a round hole? This common phrase is misleading because...

Q&A with Curtis Criswell

What do you do with United Tool Supply? As director of operations, I am involved in virtually every aspect of the business. This includes sales,...

Industry standards for steel cleanness

The correlation of steel cleanness to the performance of parts made from steel has been recognized by engineers for many years. This has been...

The Time-Temperature-Transformation Curve

In the previous column, we discussed the formation of the Iron-Carbon phase diagram. This diagram allowed us to estimate the microstructure under non-equilibrium conditions....

Q&A with Dr. Michael Fish

What’s a typical day like for you at Dontyne? For me, it’s pretty much a mixture of everything. I’m not just involved in the technical...

Tolerances associated with gears

Have you ever purchased something that cautioned, “Some assembly required” on the packaging, only to learn later that even with a master’s degree in...

Q&A with Tom Ware

What types of gear tool inspection does Star SU do? Star SU offers primary inspection of tools through the tool manufacturing process.  For most precision...

Surface finishing rotorcraft gearing

Rotorcraft gearboxes are designed with the utmost precision to withstand the tremendous demand and loads required to convert thousands of horsepower and RPM into...

The benefits of converting to helical gearing

The simplest-to-design and the easiest-to-use gearing design is that of the spur gear. It has teeth that are parallel to the shaft axis, and...

Back to basics on heat-treatment of steel, underlying metallurgy

In this article, and future articles, we will discuss the basics of the heat-treatment of steel and the metallurgical reason behind it. We start...
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