standards

Articles About standards


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1 Evolution of Worm Gear Standards and their Consequences on Load Capacity Calculation Approach (September 2014)

Beginning with a brief summary and update of the latest advances in the calculation methods for worm gears, the author then presents the detailed approach to worm gear geometry found in the revised ISO TR 10828. With that information, and by presenting examples, these new methods are explained, as are their possibilities for addressing the geometrical particularities of worm gears and their impact upon the behavior and load capacity of a gearset under working conditions based on ISO TR 14521 — Methods B and C. The author also highlights the new possibilities offered on that basis for the further evolution of load capacity calculation of a worm gearset based on load and contact pressure distribution.

2 Baldor Motor Basics: Electric Motors and Power Systems and Electric Motors and Voltage (September 2017)

Part 1: There seems to be a lot of confusion about the voltage standards for motors and why they are structured the way they are. Part 2: The effect of low voltage on electric motors is pretty widely known and understood, but the effect of high voltage on motors is frequently misunderstood.

3 Specifying a Gear - Ask the Expert (February 2014)

A reader asks what are the required parameters to properly specify a gear.

4 Not All Thin-Section Bearings Are Created Equal (February 2011)

American Bearing Manufacturers Association (ABMA) Standard 9 and ISO 281 give equations for calculating the basic dynamic radial load rating for ball bearings. These equations are based on a number of assumptions, many of which are not valid for thin-section bearings. (Thin-section bearings are described in ABMA standard 26.2.) Nevertheless, many thin-section bearing catalogs report load ratings based on these equations. Kaydon has developed a new method for calculating the dynamic radial load rating for thin-section ball bearings. The new method uses the contact stress and the number of stress-cycles-per-revolution to calculate the capacity. The new numbers are based on five years of actual test results. These equations can also be used to calculate the dynamic radial load rating for four-point contact ball bearings, which are not covered in ABMA standard 9 or ISO 281.

5 Product News (March 2018)

The complete Product News section from the March 2018 issue of Power Transmission Engineering.

6 ISO 281:2007 - Caveat Emptor (October 2016)

I was invited by Tom Astrene of TLT to write a response to the July 2010 TLT article (Ref. 1). My rebuttal — “In Search of a Fatigue Limit: A Critique of ISO Standard 281:2007” — was published in Tribology and Lubrication Engineering, TLT, August 2010 edition (Ref. 10). While this article is also available online, I will attempt to summarize the essence of my response.

7 Load Ratings & Bearing Life (March 2016)

Power Transmission Engineering is collaborating with the Bearing Specialists Association (BSA) on a special section within the magazine. Bearing Briefs will present updated reports on bearing topics for each issue in 2016. Complimentary access to all BSA Bearing and Industry Briefs is available on the BSA website at www.bsahome.org/tools.

8 Bringing Nadcap to the Medical Industry (June 2016)

The medical device industry today has numerous standards and regulations to follow, most notable amongst them being ISO 9001 and ISO 13485. However, these requirements have a shared blind spot: critical processes (heat treating, sterilization, etc.). In the medical industry, all of the standards and audits suppliers need to adhere to focus on general system quality. If the critical processes aren’t being looked at equipment can still fail because of poor craftsmanship.

9 Rating of Asymmetric Tooth Gears (April 2016)

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.

10 ISO-AGMA Standards: Specific Sliding Defined (March 2017)

Does the definition of specific sliding mean the same between ISO 21771:2007 and AGMA 917-B97? In ISO, specific sliding is the ratio of the sliding speed to the speed of a transverse profile in the direction of the tangent to the profile. In AGMA, specific sliding is ratio of gear tooth sliding velocity to its rolling velocity.

11 Rolling Bearings in High-Speed Passenger Traffic (June 2012)

Passenger transport today moves significantly faster than ever before, often operating on separate tracks especially designed for high-speed trains. Accordingly, high-speed rolling bearings are very important components in the bogies of trains today. Maximum train speeds currently reach 380 km/h (236 mph) in the latest high-speed applications - 80% higher than in the earlier days of high-speed traffic. This paper presents two application examples of modern, high-speed traffic, together with some typical bearing arrangements and housings. It provides insight regarding measures taken in the bearing industry to meet the requirements of contemporary, high-speed traffic, and it cites important standards and regulations applicable for - but not restricted to - European applications. To be precise, the focus here is on journal bearings; information on traction motor bearings, transmission bearings and housings is included, but described in less detail.

News Items About standards

1 Siemens Sinamics S120 Cabinet Module Drive Packages Now Compliant With North American Standards (September 24, 2015)
Siemens recently announced a new version of its Sinamics S120 Cabinet Module (CM) drive packages compliant with North American standards,...

2 NFPA Releases New ISO Standards (November 11, 2013)
Two new ISO standards have recently been published and are now available from the National Fluid Power Association (NFPA).ISO 1179-1:2013...

3 NFPA Releases Technical Standards (December 6, 2011)
Three new technical documents have recently been published and are now available from the National Fluid Power Association (NFPA) includi...

4 KHM Clutches Offer New Off Road Standards (November 19, 2012)
GKN Stromag's KHM clutches transfer high torque in a compact design and have a high heat capacity to accelerate high mass moments of ...

5 NFPA Releases Latest Technical Standards (February 22, 2013)
Two new technical documents have recently been published and are now available from the National Fluid Power Association (NFPA).ISO 1219-...

6 Servo Drives Add Supported Standards (June 17, 2010)
The e100 drive family from Baldor Electric Company has been reengineered to be compatible with at least three industrial Ethernet stand...

7 Belden’s Universal Joint Exceeds Military Standards (March 1, 2007)
Belden’s complete line of universal joints and shaft assemblies include a full range of military certified universal joints used in ...

8 NEMA Publishes Two Cable Standards (June 4, 2009)
The National Electrical Manufacturers Association has published RV 1-2008, Applications and Installation Guidelines for Armored Cable (AC...

9 2010 Metal Powder Testing and Bearings Standards Released (January 5, 2010)
The 2010 editions of Standard Test Methods for Metal Powders and Powder Metallurgy (PM) Products, and Standard 35, Materials Standards fo...

10 NFPA Releases New Technical Standards (November 9, 2010)
The National Fluid Power Association (NFPA) has recently released seven new technical documents that are available for purchase including...

11 Bauer Motor Design Fulfills Efficiency Standards (November 21, 2013)
The need to convert customers from super price sensitive buyers to intelligent, specification and purchasing entities remains an on-going...

12 CEMEP and NEMA Agree on Systematic Approach to Motor Efficiency Standards (October 13, 2016)
Members of the National Electrical Manufacturers Association (NEMA) Motor and Generator Section and the European Committee of Manufacture...

13 Hydraulic Institute Members Recommend Circulator Pump Standards (December 22, 2016)
Members of the Hydraulic Institute, Armstrong Fluid Technology, Grundfos, Taco Inc., WILO USA and Xlyem Applied Water Systems participate...

14 NEMA Publishes 2017 Electrical Standards Catalog (January 13, 2017)
The National Electrical Manufacturers Association (NEMA) recently published the 2017 edition of its Electrical Standards & Products G...

15 Hydraulic Institute Announces Release of Pump Industry Standards (January 15, 2016)
The Hydraulic Institute, North America’s largest pump trade association, announces the release of two final rules (1) The Energy Co...

16 NEMA Publishes 2016 Electrical Standards & Products Guide (December 9, 2015)
The National Electrical Manufacturers Association (NEMA) published the 2016 edition of its Electrical Standards & Products Guide (ESP...

17 NEMA Publishes Latest Cable Standards (January 31, 2014)
The National Electrical Manufacturers Association (NEMA) published ANSI/NEMA WC 66/ICEA S-116-732-2013 Standard for Category 6 and 6A, 10...

18 Hygienic Gearbox Meets Food and Pharma Standards (October 7, 2014)
Neugart USA has designed its new HLAE gearbox from the ground up for use in food processing, pharmaceutical and other industries with str...

19 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...