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The History of Electroplating and a Historical Review of the Evolution of NASF

The history of electroplating is a curious mixture of mistakes, observations, serendipity and experimental development, enmeshed and entwined with the discovery of electricity in the late 18th century.

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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.

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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 requirement to remove adherent burrs. 

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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!

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Materials Matter : Roughness Measurement: Optical vs. Contact Stylus Profilometry

Optical profilometry will become an important tool for predicting gear performance with more research and development of an objective lens to fit into tooth spaces.

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Rotorcraft Gearbox Regulations: LOL (not what you think)

The European Union’s CS-29 Amendment 7 places more stringent and rigorous testing requirements for certification of Category A type pressurized gearboxes under loss of lubrication conditions compared to the previous regulation.

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Materials Matter : Roughness Measurement Tips: Calibration, the Razor Blade Test

If a problem is found with a contact stylus profilometer during routine check with a Rubert-Song specimen, do a little troubleshooting before sending it off for calibration and recertification.

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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 radius tip versus a 5-micron radius tip.

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Vibratory Media Compositions 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 and densities, and why these are important in vibratory finishing of gears.

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Selecting media for optimum vibe bowl gear finishing

Choosing the best media depends on structure and shape of the tooth flank, and whether media components should be abrasive, non-abrasive, or a blend.

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Materials Matter: How to Set Up a Vibratory Bowl for Gear Finishing

The vibratory bowl is toroidal-shaped, consisting of a center hub surrounded by an OD wall. Direct drive machines have a motor and driveshaft set inside the center hub.

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Physical Characteristics of the Vibratory Bowl and How They Affect Processing Efficiency

Vibratory bowls are outfitted with hot-poured polyurethane liners and their durometer hardness is an oft-cited characteristic. But what is durometer hardness and how is it useful?

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