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May/June 1995

Archive > 1995 > May/June 1995

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Feature Articles

Ten Myths About Gear Lubrication
Myth No. 1: Oil Is Oil. Using the wrong oil is a common cause of gear failure. Gears require lubricants blended specifically for the application. For example, slow-speed spur gears, high-speed helical gears, hypoid gears and worm gears all require different lubricants. Application parameters, such as operating speeds, transmitted loads, temperature extremes and contamination risks, must be considered when choosing an oil. Using the right oil can improve efficiency and extend gear life.

Developing a Total Productive Maintenance System
There's a reason they call it catastrophic gear failure: For example, if the line goes down at a large aluminum rolling mill because a gear set goes bad, the cost can run up to a whopping $200,000 a week. Even in smaller operations, the numbers alone (not to mention all the other problems) can be a plant manager's worst nightmare.

CNC Software Savvy
Question: When we purchase our first CNC gear hobbing machine, what questions should we ask about the software? What do we need to know to correctly specify the system requirements?

Motherhood, Apple Pie and the Bottom Line
Business ethics are like apple pie and motherhood. Few people are willing to come out agin'em. But in reablity, apple pie is full of fat and refined sugar, motherhood is not what it was when June Cleaver ran the kitchen, and business ethics? Well, it's always been easier to talk about them than to actually practice them, and things certainly haven't improved in the last few years.

Bradley Lawton of Star Cutter
Continuing our series of interviews with industry leaders, Gear Technology spoke recently with Bradley Lawton, executive vice president of Star Cutter Co., about the role and direction of cutting tools in the gear industry today.

Gear Oil Classification and Selection
Today gear drive operations have several options when selecting the proper lubricant for their gearboxes. As in the past, the primary lubricant used for gearbox lubrication is mineral oil. But with the advances in technology, synthetic hydrocarbons (PAOs) and polyglycols show very specific advantages in certain applications. With gear drives becoming more and more precise, it is now also to the benefit of the gear operator to verify that he or she has the proper additive package and viscosity in the lubricant selected. Fig. 1 shoes that a gear oil is a combination of a base oil and specific additives. The base oils can be either mineral oil, a synthetic or even in some cases a combination of the two.

Eco-Friendly Cutting Fluids
Okay, so you want to make some high quality gears for your customers, and you want to make a profit for your company, but you don't want to make a mess of the environment. What can you do?

Technical Articles

Long-Life, Low-cost, Near-Net-Shape forged Gears
Near-net gear forging today is producing longer life gears at significantly lower costs than traditional manufacturing techniques. Advances in forging equipment, controls and die-making capability have been combined to produce commercially viable near-net-shape gears in diameters up to 17" with minimum stock allowances. These forged gears require only minimal finishing to meet part tolerance specifications.

EHL Film Thickness, Additives and Gear Surface Fatigue
Aircraft transmissions for helicopters, turboprops and geared turbofan aircraft require high reliability and provide several thousand hours of operation between overhauls. In addition, They should be lightweight and have very high efficiency to minimize operating costs for the aircraft.

Departments

Business Ethics Touchstone or Oxymoron (Publishers Page)
"Values" is one of he buzzwords we hear everywhere today. Family values. Traditional values. Alternative values. Along with a balanced budget, less government and more fiber in our diets, "values" - and their practical counterparts, "ethics" - are being promoted as one of the simple, obvious solutions to what ails us as a country and as individuals.

Product News (Product News)
Welcome to our new Product News page. Here we will feature new products of interest to the gear and gear products markets.

Technical Calendar (Events)
Complete technical calendar for May/June 1995.

Industry News (Industry News)
Who's Who...What's What...Movers...Shakers...Name Changers...and Other Items of Interest

Addendum III - The Return (Addendum)
Gear Technology's bimonthly aberration - gear trivia, humor, weirdness and oddments for the edification and amusement of our readers. Contributions are welcome.