Articles About ISA
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Involute splines are commonly used in gearboxes to connect gears and shafts, especially when high torque is transmitted through the coupling. The load is shared among multiple teeth around the coupling circumference, resulting in higher load capacity than a conventional single key. However, the total load is not equally shared among all spline teeth, mainly because of pitch deviations resulting from the manufacturing process. The load distribution along the spline engagement length is also nonuniform because of tooth misalignments and shaft torsional effects. This paper presents an investigation of the influence of spur gear loads on the load distribution of spline teeth.
Energy costs and downtime can be greatly reduced by instituting a motor management plan. Part II of this three-part series specifically addresses the establishment of a motor failure policy and the development of purchasing specifications. Part I addressed the general aspects of a motor management plan, including the first steps of creating a motor inventory and guidelines for motor repair and replacement. Part III will examine motor repair specifications as well as preventive and predictive maintenance.
The complete Industry News section from the October 2018 issue of Power Transmission Engineering.
According to the Department of Energy (DOE), more than half of all electrical energy consumed in the U.S. is used by electric motors. To address this, several years ago, the DOE conducted a technical study as to what could be done to raise the efficiency levels of âœsmallâ motors. After years of study and litigation, the Small Motor Rule (SMR) was passed that covers two-digit NEMA frame single- and three-phase ¼ through 3 horsepower motors in open enclosures.
In most applications, gearbox reliability is critical to the productivity of the overall plant operation. So it follows that when industry is looking at the best ways to increase efficiency, reduce downtime, and increase profitability, gearbox performance and reliability are key factors. Designing for repair, and writing effective repair procedures, can speed the service time, and provide a quality refurbishment. The best practices listed in this article are proven, effective methods used to install and remove bearings, seals, gears, couplings and shafts within a gearbox.
The U.S. Space Shuttle fleet was originally intended to have a life of 100 flights for each vehicle, lasting over a 10-year period, with minimal scheduled maintenance or inspection. The first space shuttle flight was that of the Space Shuttle Columbia (OV-102), launched April 12, 1981. The disaster that destroyed Columbia occurred on its 28th flight, February 1, 2003, nearly 22 years after its first launch.
Mounted ball bearings are everywhere in industrial applications. They serve critical roles in keeping a manufacturing operation running smoothly and in ensuring that equipment functions properly and reliably. So why might it be advisable to spend significantly more for a dimensionally comparable bearing from one supplier versus another?
Over the many years, there have been many technical papers and articles about which motor is the best. The short and sweet answer is - let's talk about the application. More recently a number of papers and articles have appeared that compared each motor's advantages and disadvantages in generic or specific terms. Many times, the methods used to drive and control these motors are not completely described due to the many control schemes available for use. A few articles focus on just the open loop step motor and the closed loop servo motor advantages and disadvantages in a laundry list format. This article is attempting to "drill down" into the reasons why and to describe how it is done.
Grease lubrication has clear advantages over oil lubrication: Grease does not leak easily; it has sealing properties; and it protects bearing surfaces from corrosion. Its disadvantages are grease-life limitations and a limited cooling ability. Moreover, in some applications there is a risk of grease starvation, which leads to reduced lubricating films. However, if the right grease, sealing system and/or lubrication system are chosen, then grease lubrication offers clear benefits. This article summarizes aspects of grease lubrication mechanisms in rolling bearings.
Experienced operators can often tell if a machine is not working properly, on the basis that it does not â˜sound right.â™ The same principle can be applied â” using modern electronics â” to identify the exact cause of the problem. Sensitive accelerometers can detect and analyze the vibrations from industrial equipment, highlighting problems such as misalignment or bearing imbalance. The technique is known as vibration analysis. It can identify bearing failure in the very early stages, when there is a microscopic defect on the raceway, for example. The problem is that the identifying signal is usually drowned out in all the other noise emanating from the machine.
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.
For many years bellows couplings have been near the top of the list of flexible coupling choices for high-performance motion systems. Their high torsional stiffness, low moment of inertia and minimal restoring forces under misalignment make them a preferred choice for maintaining tight control over the load.
Power transmission couplings are widely used for modifi cation of stiff ness and damping in power transmission systems, both in torsion and in other directions (misalignment compensation).
You need to transmit a rotary motion where no straight line is possible. Or, you need to allow for some uncontrollable misalignment. How about transmission taking place between moving components? What if you need to control something in hazardous locations where you cannot directly handle the application, such as high-temperature environments, under hazardous conditions or in clean room applications? Functionally designed flexible shafts can meet all these challenges.
Part I of this article appeared in the October 2008 issue. It provided an overview and general classifi cations of power transmission couplings, along with selection and performance criteria for rigid couplings and misalignment-compensating couplings. Part II continues the discussion with selection and performance criteria for torsionally flexible and combination-purpose couplings.
If youâ™re replacing your belts more than once per year, itâ™s time to analyze your drive. From belt crimping damage to high belt installation tension to sprocket misalignment and adverse environmental conditions, this guide walks you through how to identify the reasons behind premature failure and makes recommendations on corrective and preventive measures.
In most cases, industrial power transmission calls for flexible rather than rigid couplings in order to forgive minor shaft misalignment. For that reason, this article will focus solely on the selection of flexible couplings.
The glass is at least half-full—and there is no hole in the glass. While fiscal cliff disaster is a possibility, weâ™re thinking more fiscal pothole.
News Items About ISA
1 United Nations Committee Set to Integrate ISA Standards into Cybersecurity Framework (January 11, 2019)
The United Nations Economic Commission for Europe (UNECE) has confirmed it will integrate the widely used ISA/IEC 62443 series of stand...
2 ISA Announces Appointment of Executive Director (August 29, 2018)
The International Society of Automation (ISA) recently announced the appointment of automation industry veteran Mary Ramsey as its new ex...
3 Altra Offers Combined Misalignment Coupling and Slip Clutch (July 8, 2014)
The Oldham clutch-coupling from Huco Dynatork provides system protection and misalignment compensation in one, compact device. It combine...
4 Zero-Max Couplings Help Minimize Misalignment (December 15, 2010)
Design engineers looking to reduce heat transfer from servo motors to driven shafts will find ServoClass Couplings from Zero-Max a suitab...
5 Ruland's Couplings Accomodate High Misalignment (June 7, 2007)
Ruland Manufacturing's oldham couplings accomodate large amounts of parallel misalignment. Applications for oldham couplings incl...
6 SKFs Toroidal Roller Bearings Accomodate Heavy Loads and Misalignment (March 14, 2006)
The SKF Carb torodial roller bearings serve as non-located bearing in large electric motors (125 Hp and above) with their capability to a...
7 Timken Brings Revolvo Split Roller Bearing Accommodates Misalignment Up to +/-1.5 Degrees (October 15, 2015)
The Timken Company recently introduced its full Revolvo split cylindrical roller bearing housed unit line to the North American marketpla...
8 Zero-Max Wind Turbine Couplings Easily Handle Torque Spikes and Misalignment (October 10, 2016)
Zero-Max Wind Turbine Couplings are now available as an upgrade replacement for existing wind turbines and for OEM applications.Proven an...
9 Zero-Max Custom Coupling Provides Solution for Handling Extra Misalingment (December 12, 2018)
The challenge was connected motion components in a composite fiber processing system that needed extra parallel misalignment capacity to ...
10 Siemens Partners with ISA to Foster Awareness of Industrial Cybersecurity (September 1, 2017)
As threats to automation equipment are always changing and evolving, so too is the protection concepts for industrial plants. To address ...
11 KISSsoft Determines Misalignment of Bevel Gears in Latest Update (October 18, 2016)
The relative position of the pinion and the ring gear is critical in determining the wear patterns of bevel gears. To determine the bevel...
12 Miki Pulley Couplings Absorb Vibration While Allowing High Misalignment (January 18, 2016)
Miki Pulley is introducing their new Bellowflex Couplings for direct sale to OEM’s in North America. These couplings absorb vibrati...