Mark Michaud Archives - REM Surface Engineering

Results of ISO/TS 6336-22 Evaluating Full Contact Zone

Posted by Danny Estrada on Dienstag, Dezember 13th, 2022 in

Description of ISO/TS 6336-22 The previous paper contained a detailed description of the methods in ISO/TS 6336-22. A brief […]...

Case Study of ISO/TS 6336-22 Micropitting Calculation

Posted by Danny Estrada on Mittwoch, Mai 5th, 2021 in

ISO/TS 6336-22 (Calculation of load capacity of spur and helical gears — Part 22: Calculation of micropitting load capacity) is the ISO technical specification containing a proposal for a calculation for the risk of micropitting in gear sets....

Gear designers and manufacturers will need to review and update their tooth flank roughness specifications based on the new ISO 21920 GPS family of standards.

Changes Ahead in the Roughness Standards

Posted by Mark Michaud on Freitag, Mai 15th, 2020 in

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

Materials Matter (DE)

Posted by Jac Sinex on Dienstag, Mai 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....

Report of the Condition of a General Electric Transportation Systems Gearbox

Posted by Mark Michaud on Dienstag, April 14th, 2020 in

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 install...

Rotorcraft Gearbox Regulations: LOL (not what you think)

Posted by Mark Michaud on Montag, März 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....

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

Posted by Mark Michaud on Dienstag, Februar 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....

Roughness Measurement Tips: The Scratch Pad

Posted by Mark Michaud on Donnerstag, Januar 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....

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

Posted by Mark Michaud on Freitag, Oktober 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...

Measuring Tooth Flank Roughness

Posted by Mark Michaud on Mittwoch, Januar 23rd, 2019 in

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....

Gear Expo Live! Ask the Expert with Mark Michaud

Posted by Mark Michaud on Freitag, Februar 23rd, 2018 in

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A Novel Approach to the Refurbishment of Wind Turbine Gears

Posted by Danny Estrada on Mittwoch, November 13th, 2013 in

Multi-megawatt wind turbine gearboxes operate under demanding environmental conditions including considerable variation in temperature, wind speed, and air quality....