Machinery Lubrication magazine published by Noria Corporation
Issue link: https://www.e-digitaleditions.com/i/108300
IN THE TRENCHES Speed can also have an effect on micropitting and surface fatigue. At lower speeds, the film thickness will decrease. Likewise, at higher speeds, the film thickness can increase. This is another factor to consider in selecting the correct viscosity for your application. The operating temperature also plays a role in micropitting and surface fatigue. As the temperature increases at the contact area, the oil's viscosity becomes lower and film thickness decreases. As the temperature increases, a lubricant with too low of a viscosity will become thinner and not provide adequate protection, leading to an increased rate of micropitting and High Risk Contacts From page 38 Anywhere rolling contact occurs in machinery there is potential for micropitting and surface fatigue. This would include rolling-element bearings (along the base of the raceway). Gears also have rolling contact, which usually occurs around the pitchline. Cams and rollers are other examples of where you can see rolling contact and thus possible surface fatigue and micropitting. accelerated oxidation. If oil analysis is not used to determine the remaining useful life and trigger the need for an oil change, the oil will break down and not provide sufficient protection. About the Author Josh Pickle is a technical consultant with Noria Corporation, focusing on machinery lubrication and maintenance in support of Noria's Lubrication Program Development (LPD). He is a mechanical engineer who holds a Machine Lubrication Technician (MLT) Level II certification and a Machine Lubricant Analyst (MLA) Level I certification through the International Council for Machinery Lubrication (ICML). Contact Josh at jpickle@noria.com. surface f f fatigue. If an EP oil is used, the EP additives b f l d h dd become more reactive at higher temperatures and can offer protection from adhesive wear. Of course, too high of a viscosity can also generate excessive heat. This heat that is caused by too high of a viscosity will lead to DYNAMIS & DYNAMIS MAXX ® ® 81% SERIOUS ENGINEERING FOR SERIOUS APPLICATIONS. DIRECT SALES HOTLINE (+1) 800-631-0168 Industrial Applications of lubrication professionals have professionals have on s av micropitting or seen the effects of micropitting or cr co t g surface fatigue in the gears at their gears at their surfac fatigu surface fatigue fac fati ace tigu ea a h i plant, ased plant, based on recent survey at plant, based on a recent survey at nt n urve machinerylubrication.com mach ne machinerylubrication.com hi er ca cation.com at © 2013 BIJUR DELIMON INTERNATIONAL. ALL RIGHTS RESERVED. Industrial Machinery Wind Turbines FEATURES AND BENEFITS: • Injector and progressive divider models • Output ~ 4,350 PSI / 360° Orientation UNITED STATES • Smart, rugged, modular design • 2 to 20 liter reservoir capacity • 12VDC, 24VDC or 110/240VAC CHINA | FRANCE | GERMANY | UNITED KINGDOM | IRELAND | INDIA | SPAIN | RUSSIA CORPORATE HEADQUARTERS 2100 GATEWAY CENTRE BLVD, SUITE 109, MORRISVILLE, NC 27560 50 | • Available on-board PcO controller • + 70C to -30C operation; grease or oil • Durability tested and built to last January - February 2013 | www.machinerylubrication.com Mobile Vehicles Transfer Lines SALES BIJURDELIMON.COM