April 2016

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April 2016 (Complete Issue PDF)

Feature Articles

Nasa Glenn Research Center - A Look Back
In 1941, the federal Aircraft Engine Research Laboratory set up shop in Cleveland, Ohio. This year, and several name changes later, what is now the NASA Glenn Research Center celebrates its 75th anniversary. As part of the year-long festivities, Glenn’s adjunct Lewis Field main campus will be open to the public May 21 and 22, and Plum Brook Station in Sandusky, Ohio will hold its open house June 11 and 12.

What Lubrication Method Should I Use
in the performance and life of a rolling element bearing. Less than 10 percent of bearings reach their theoretical L10 life, and poor lubrication can be attributed to 80 percent of those that fall short. Ideally, a lubricant forms a film layer between moving components in a bearing, separating moving parts, minimizing friction and preventing wear between balls or rollers, raceways and retainers. Lubricants also protect metal surfaces from corrosion and moisture, dissipate heat and can even prevent the ingress of contaminants.

The To-Do List
Lubrication management should be standard operating procedure at any manufacturing facility. Vital to both operational and maintenance personnel, a strong, coherent and specific lubrication program will have lasting results in machine efficiency and maintenance. Of course, even those with the best intentions can’t always keep up with the challenges presented day-to-day on the manufacturing floor. Thankfully, PTE is here to help with eight steps to selecting, storing, analyzing and managing your lubrication requirements.

Case Study: JBJ Techniques and the BLOODHOUND SSC Project
Specialist power transmission supplier JBJ Techniques Limited, of Redhill, Surrey, England were recently contacted by the staff of Bloodhound SSC R&D engineering team to solve a problem on the fuel pump test rig. JBJ Techniques had worked with various team members in the past and this previous experience made JBJ an easy choice to assist with this project. The scope of supply was to produce a suitable drive coupling with a maximum diameter of 160 mm, capable of transmitting 550 Nm @ 10,000 rpm, with as short an assembly as possible, and at the same time be able to accept misalignment within the drivetrain.

Technical Articles

Rating of Asymmetric Tooth Gears
Asymmetric tooth gears and their rating are not described by existing gear design standards. Presented is a rating approach for asymmetric tooth gears by their bending and contact stress levels, in comparison with symmetric tooth gears, whose rating are defined by standards. This approach applies finite element analysis (FEA) for bending stress definition and the Hertzian equation for contact stress definition. It defines equivalency factors for practical asymmetric tooth gear design and rating. This paper illustrates the rating of asymmetric tooth gears with numerical examples.

Metallurgical Failure Analysis of Power Transmission Components
When a power transmission component fails, it can adversely affect the performance of the assembly, often making the machine inoperable. Such failures can not only harm the reputation of the manufacturer, but can lead to litigation, recalls and delays in delivery due to quality concerns. Some failures can even result in bodily injury or death. Understanding why a part failed is critical to preventing similar failures from reoccurring. In the study of a failed part, the analyst must consider a broad range of possibilities for the failure. Although some failures can be attributed to a single primary cause, it is common for multiple secondary factors to contribute. The failure analyst must evaluate all of the evidence available to prepare a hypothesis about the causes of failure.


He Shoots, He Scores! (Publishers Page)
There’s nothing quite as satisfying as scoring a goal. Here at Power Transmission Engineering, our goal is to provide you with as much relevant educational and technical material as possible, and every issue we strive to cover the subjects of power transmission and motion control from as many different angles as possible, so that no matter your job title, and no matter your industry, if gears, bearings, motors and related components are important to you, we’ve got you covered.

Analyzing the Cement Process (Bearing Briefs)
The manufacturing process begins in a limestone quarry. Mining methods such as ripping, dozing, drilling and blasting are commonly employed. Limestone provides the first essential component, calcium, for the anufacture of cement. Materials are transported to the crushing plant for further size reduction. Common methods of transport are trucks, loaders and belt conveyors.

Preventing Downtime for Hanger Bearings (Field Notes)
Dale Renner, CBS and sales representative at Bearing Headquarters Co., explains how his bearing expertise helped solve a customer’s problem and saved significant downtime and cost.

Product News (Product News)
Latest news about upcoming products.

Plan Accordingly (Events)
Three upcoming shows cater to different areas of power transmission components and motion control technologies, including Windpower 2016, Powdermet 2016 and the Sensors Expo & Conference. All three exhibitions will offer the latest products, solutions and latest real world applications dedicated to wind energy, powder metal technologies and sensors. Here’s a quick rundown:

Calendar (Events)
Calendar of Events

Industry News (Industry News)
News from around the Industry.

Automatic for the People (Power Play)
The world is full-on automated. From our factories to our vehicles to our leisurely activities, the future is now and it’s nothing but algorithms, robotics and hands-free operation. It comes as no surprise that a 2016 Google search brings a fair amount of technology gone awry. The following examples don’t scare us (they’re actually quite fascinating) but they probably should worry us a little bit…