surface roughness

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

Posted by on Sunday, April 19th, 2020 in

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)

Posted by on Monday, March 16th, 2020 in

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

Posted by on Tuesday, February 25th, 2020 in

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

Posted by on Thursday, January 16th, 2020 in

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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A Comparison of Surface Roughness Measurement Methods for Gear Tooth Working Surfaces

Posted by on Friday, October 25th, 2019 in

Surface roughness is a critical parameter for gears operating under a variety of conditions. It directly influences friction and contact temperature, and therefore has an impact on various failure modes such as macropitting, micropitting and scuffing...

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Vibratory Media Compositions vs. Attrition and Density

Posted by on Tuesday, October 1st, 2019 in

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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Materials Matter : Surface Finishing Rotorcraft Gearing

Posted by on Wednesday, October 3rd, 2018 in

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

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Materials Matter: Additive Manufacturing: Challenges, Possibilities, and the Gear Industry

Posted by on Thursday, March 30th, 2017 in

Additive Manufacturing (AM) is a technology that has the potential to fundamentally alter manufacturing, specifically metal manufacturing. The ability to design complex shapes, which could not otherwise be manufactured, coupled with a significant red...

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An Evaluation of the New Rapid ISF® Process for Rear-Axle Gears

Posted by on Friday, November 15th, 2013 in

The benefits gained by Superfinishing rear-axle gearsets using traditional chemically accelerated vibratory finishing is well documented....

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Comparative Corrosion Characteristics of Ground and Superfinished Gear Steels

Posted by on Friday, November 15th, 2013 in

The described effort was undertaken to assess the impact of the isotropic superfinishing (ISF®) process on the corrosion resistance of a variety of gear steels....

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The Effect of the Surface Roughness Profile on Micropitting

Posted by on Tuesday, November 19th, 2013 in

A wide choice of surface roughness parameters is available to characterize components, such as gears or bearings, with the goal of predicting the performance of such metal--to--metal contacting parts....

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