July 2015

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Feature Articles

New Transmissions Make the Gas GREENER
€œHighway vehicles release about 1.7 billion tons of greenhouse gases (GHGs) into the atmosphere each year €” mostly in the form of carbon dioxide (CO2) €” contributing to global climate change. The CO2 emissions of a car are directly proportional to the quantity of fuel consumed by an engine. In 2013, U.S. greenhouse gas emissions from transportation were second only to the electricity sector €” an increase of about 16% since 1990.€ (EPA.GOV).

Manufacturing Jobs Are There - Workers to Fill Them ARE NOT
An all too common €” and disturbing €” question these days: Are you having trouble finding skilled workers? Taking that a step further begs the next question €” Are you having trouble finding customers with

Dont Get Burned
Questions to Ask Your Heat Treater Provided by Justin Lefevre (Joyworks LLC, Ann Arbor, MI), Kathy Hayrynen (Applied Process, Inc., Livonia, MI) and Vasko Popovski (Applied Process, Inc.)

Technical Articles

Gear Inspection in a Shop Floor Environment
As in nearly all industries, more costeffective solutions are currently called for in the gear manufacturing industry.

I Like Big Gears and I Cannot Lie!
Many years ago, when asked how the five-meter gear was checked, the quality manager responded, €œWhen they€™re that big, they€™re never bad!€ That may have been the attitude and practice in the past, but it no longer serves the manufacturer nor the customer. Requirements have been evolving steadily, requiring gears to perform better and last longer.

The Basics of Gear Theory, Part 2
The first part of this publication series covered the general basics of involute gearing and applied the generating principle of cylindrical gears analogous to angular gear axis arrangements the kinematic coupling conditions between the two mating members have been postulated in three rules. Entering the world of bevel gears also required to dwell somewhat on the definition of conjugacy. The second part is devoted to the different generating gears and the chain of kinematic relationships between the gear - gear generator - pinion generator and pinion.

Elastohydrodynamic Lubrication (EHL): A Review
This review of elastohydrodynamic lubrication (EHL) was derived from many excellent sources (Refs. 1€“5). The review of Blok€™s flash temperature theory was derived from his publications (Refs. 6€“9). An excellent general reference on all aspects of tribology is the Encyclopedia of Tribology (Ref. 10).

Impact of Indexing Errors on Spur Gear Dynamics
A transverse-torsional dynamic model of a spur gear pair is employed to investigate the influence of gear tooth indexing errors on the dynamic response. With measured long-period quasi-static transmission error time traces as the primary excitation, the model predicts frequency-domain dynamic mesh force and dynamic transmission error spectra. The dynamic responses due to both deterministic and random tooth indexing errors are predicted.

Departments

One More Reason (Publishers Page)
If you haven€™t already done so, you should make plans to attend Gear Expo in September. It€™s a unique and important show, and you should take advantage of it.

Product News (Product News)
News on the latest Products from the Industry

Determining Bull Gear Wear (Ask the Expert)
We are currently experiencing wear on the bull gear on our converter at the steel plant. We want to be able to draw the original gear profile to compare this with the worn tooth before we decide on the next steps. I have attempted this, but there is a correction factor given and I am unsure how to apply this. Could someone give advice on this? Please find attached the PDF€™s for the bull gear and the pinion gear. They are old drawings! The wear is on the wheel.

Calendar (Events)
Calendar

Industry News (Industry News)
News from the Gear Industry

A Reel Big Deal (Addendum)
One time not long ago, under the foreboding glow of moonlight, Scott Sakuta was almost murdered by a tarpon.