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Mechanical paste polishing vs. CAVF finishing of gears

A recent Materials Matter article compared generic deburring versus CAVF (chemically accelerated vibratory finishing.) Both techniques are conducted in a vibratory unit. The main advantage of...

The challenges of generic deburring vs. CAVF deburring

Relative to gear hobbing, shaving, and/or post heat-treat grinding to generate accurate tooth morphology there may come a time wherein vibratory deburring is a...

Changes ahead in the roughness standards

I have written numerous articles on tooth flank surface roughness measurement. This is such a page-turner of a subject! Actually, I was thinking I...

Roughness measurement: Optical vs. contact stylus profilometry

To date, I have written several articles on contact stylus profilometry. This roughness measurement technique, when applied to gear flanks, is repeatable and reproducible...

Rotorcraft gearbox regulations: LOL (not what you think)

For more than a decade, one of the most intensively researched subjects in aerospace engineering has been LOL. No, we are not talking about...

Roughness measurement tips: Calibration, the razor blade test

In my previous column in Materials Matter, I reviewed the use of the “Scratch Pad” for the overall checking of the contact stylus profilometer’s...

Roughness measurement tips: The scratch pad

From the perspective of the shop floor environment, the previous Materials Matter column “Roughness Measurement Tips: 2 V 5” discussed the contact stylus 2-micron...

Roughness measurement tips: 2- vs. 5-micron

I’ve written three articles on gear flank roughness measurement for this magazine (Materials Matter; January 2016 and February 2016, and an issue-focus article in...

Tips to increase vibratory performance during gear polishing

In our final article in this series on gear polishing using vibratory equipment, let’s take a look at some troubleshooting tips to increase the...

Vibratory media composition vs. attrition and density

The third in our multi-part series on vibratory processing of gears is focused on understanding how media of different compositions have varying attrition rates...

Selecting media for optimum vibe bowl gear finishing

The second in our multi-part series on vibratory processing of gears is focused on the selection of media that will be used to improve...

How to set up a vibratory bowl for gear finishing

This is the first in a multi-part series on vibratory processing of gears. This article is focused on machine set-up for optimal mass motion. Overview...

Magnetic particle testing and evaluation of AMS AQ test samples

Aircraft quality (AQ) testing of steels per AMS 2300, 2301, 2303, and 2304 requires specialized sampling and specimen preparation prior to final evaluation using...

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...

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....

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...

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 state of the art of wind turbine gearboxes

Much has been written here about the global growth in the wind turbine industry. Today, more than 341,320 wind turbines are operating worldwide. In...

Future of gear design relies on overcoming present

Increasing application demands and the need for higher performance mean the future is coming fast for gear designs. The next generation of gear engineers...

Forging the next generation in gear quality

Forging and casting are commonly used processes in gear manufacturing. While both provide product close to near net shape, forging offers several benefits casting...
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