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Technische Abhandlungen
Report of the Condition of a General Electric Transportation Systems Gearbox
Wind power plant operation and maintenance (O&M) costs remain an appreciable contributor to the overall cost of wind energy, with a capacity-weighted average of $11/megawatt-hour (MWh) for projects installed since 2000 and $9/MWh for projects installed since 2010
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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.
Technische Abhandlungen
A Comparison of Surface Roughness Measurement Methods for Gear Tooth Working Surfaces
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
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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Measuring Tooth Flank Roughness
Gear performance has continuously increased over the past two decades. Improvements in metals, heat treatments, geometry, and lubrication are just a few of the sources of these improvements.
Technische Abhandlungen
Surface Treatment of Powder-Bed Fusion Additive Manufactured Metals for Improved Fatigue Life
High-cycle fatigue (HCF) tests were conducted on samples fabricated by two powder-bed additive manufacturing techniques.
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Materials Matter : 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 hundreds of RPM and lift torque.
