Friction

ASK THE EXPERT | 2017-11-01

Friction Coefficient of Differently Treated Steel Surfaces

A reader asks about ion-nitride finished shafts and the proper friction coefficient to be used for calculations.

INDUSTRY NEWS | 2017-03-21

Worm Gears: Higher Energy Efficiency and Less Strain on Resources

Introduction The concepts of sustainability and energy efficiency are gaining importance in power transmission engineering. Mor...

FEATURE ARTICLES | 2016-08-01

IMTS 2016 Booth Previews

Comprehensive descriptions of what you will find in the booths of many leading gear industry suppliers at IMTS 2016.

GEAR TALK WITH CHUCK | 2016-03-24

Malicious Obedience

After posting about the difficulty in keeping my “inner engineer” under control outside the workplace, several readers admitted to the same troub...

GEAR TALK WITH CHUCK | 2016-02-25

New Ideas in Gears

One of the perks of being a “public” gear person is the opportunity to interact with interesting people in and around our industry. Gear Techno...

GEAR TALK WITH CHUCK | 2016-02-11

The World before Wikipedia and Google

I have a lot of books. Like old friends, they sit on shelves and in boxes waiting for me to need them. It has been pointed out to me that books are...

TECHNICAL ARTICLES | 2016-01-01

Influences on Failure Modes and Load-Carrying Capacity of Grease-Lubricated Gears

In order to properly select a grease for a particular application, a sound knowledge of the influence of different grease components and operating conditions on the lubrication supply mechanism and on different failure modes is of great benefit.

INDUSTRY NEWS | 2015-08-04

Dillon Full Grip Jaws Reduce Distortion and Provide More Friction

Dillon Manufacturing recently introduced full grip jaws made of 1018 CR steel from 6 inches to 15 inches in diameter, with heights of 2, ...

INDUSTRY NEWS | 2015-07-16

Dillon 1018 CR Steel Full Grip Jaws Reduce Distortion and Provides More Friction

Dillon Manufacturing recently introduced full grip jaws made of 1018 CR steel from 6" to 15" in diameter, with heights of 2&quo...

ASK THE EXPERT | 2013-06-01

Worn Gear Contact Analysis

How does one perform a contact analysis for worn gears? Our expert responds.

TECHNICAL ARTICLES | 2010-08-01

Optimizing Gear Geometry for Minimum Transmission Error, Mesh Friction Losses and Scuffing Risk Through Computer- Aided Engineering

Minimizing gear losses caused by churning, windage and mesh friction is important if plant operating costs and environmental impact are to be minimized. This paper concentrates on mesh friction losses and associated scuffing risk. It describes the preliminary results from using a validated, 3-D Finite Element Analysis (FEA) and Tooth Contact Analysis (TCA) program to optimize cylindrical gears for low friction losses without compromising transmission error (TE), noise and power density. Some case studies and generic procedures for minimizing losses are presented. Future development and further validation work is discussed.

PRODUCT NEWS | 2006-09-01

Product News

The complete Product News section from September/October 2006.

TECHNICAL ARTICLES | 2005-09-01

Determining Power Losses in the Helical Gear Mesh

This article reviews mathematical models for individual components associated with power losses, such as windage, churning, sliding and rolling friction losses.

PUBLISHER'S PAGE | 1989-01-01

Leonardo, the Engineer

These lines, interesting enough, are from the notebooks of an artist whose images are part of the basic iconography of Western culture. Even people who have never set foot in a museum and wouldn't know a painting by Corregio from a sculpture by Calder, recognize the Mona Lisa. But Leonardo da Vinci was much more than an artist. He was also a man of science who worked in anatomy, botany, cartography, geology, mathematics, aeronautics, optics, mechanics, astronomy, hydraulics, sonics, civil engineering, weaponry and city planning. There was little in nature that did not interest Leonardo enough to at least make a sketch of it. Much of it became a matter of lifelong study. The breadth of his interests, knowledge, foresight, innovation and imagination is difficult to grasp.

TECHNICAL ARTICLES | 1988-09-01

Crowned Spur Gears: Optimal Geometry and Generation

Involute spur gears are very sensitive to gear misalignment. Misalignment will cause the shift of the bearing contact toward the edge of the gear tooth surfaces and transmission errors that increase gear noise. Many efforts have been made to improve the bearing contact of misaligned spur gears by crowning the pinion tooth surface. Wildhaber(1) had proposed various methods of crowning that can be achieved in the process of gear generation. Maag engineers have used crowning for making longitudinal corrections (Fig. 1a); modifying involute tooth profile uniformly across the face width (Fig. 1b); combining these two functions in Fig. 1c and performing topological modification (Fig. 1d) that can provide any deviation of the crowned tooth surface from a regular involute surface. (2)