Machine design, tập 84, số 06, 2012

April 19, 2012 A Penton Media Publication Tune in to EngineeringTV.com ENGINEERING SALARY SURVEY Where you fit in? page 20 SEALED BEARINGS GO GREEN, page 18 PREDICTIVE MODELING FOR BETTER MANUFACTURABILITY, page 44 WHEN PRECISION BELLOWS OUTPERFORM COIL SPRINGS, page 52 Digital Edition Copyright Notice The content contained in this digital edition (“Digital Material”), as well as its selection and arrangement, is owned by Penton Media, Inc and its affiliated companies, licensors, and suppliers, and is protected by their respective copyright, trademark and other proprietary rights Upon payment of the subscription price, if applicable, you are hereby authorized to view, download, copy, and print Digital Material solely for your own personal, non-commercial use, provided that by doing any of the foregoing, you acknowledge that (i) you not and will not acquire any ownership rights of any kind in the Digital Material or any portion thereof, (ii) you must preserve all copyright and other proprietary notices included in any downloaded Digital Material, and (iii) you must comply in all respects with the use restrictions set forth below and in the Penton Privacy Policy and the Penton Terms of Use (the “Use Restrictions”), each of which is hereby incorporated by reference Any use not in accordance with, and any failure to comply fully with, the Use Restrictions is expressly prohibited by law, and may result in severe civil and criminal penalties Violators will be prosecuted to the maximum possible extent You may not modify, publish, license, transmit (including by way of email, facsimile or other electronic means), transfer, sell, reproduce (including by copying or posting on any network computer), create derivative works from, display, store, or in any way exploit, broadcast, disseminate or distribute, in any format or media of any kind, any of the Digital Material, in whole or in part, without the express prior written consent of Penton Media, Inc To request content for commercial use or Penton’s approval of any other restricted activity described above, please contact the Reprints Department at (888) 858-8851 Without in any way limiting the foregoing, you may not use spiders, robots, data mining techniques or other automated techniques to catalog, download or otherwise reproduce, store or distribute any Digital Material NEITHER PENTON NOR ANY THIRD PARTY CONTENT PROVIDER OR THEIR AGENTS SHALL BE LIABLE FOR ANY ACT, DIRECT OR INDIRECT, INCIDENTAL, SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF OR ACCESS TO ANY DIGITAL MATERIAL, AND/OR ANY INFORMATION CONTAINED THEREIN
 
 

 

    


  
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 RS# 114 SCANNING FOR IDEAS Sealed bearing cartridges are green and can handle the load Sealed bearing cartridges such as those from GGB Bearing Technology, Thorofare, N. J (www.ggbearings.com), are cost-effective, environmentally friendly alternatives to conventional bronze, hardened-steel, and rolling-element bearings The key component in the cartridge is the filament-wound bearing, which can be made of either GAR-MAX or HSG, and each provides different operating ranges Being self-lubricating, the cartridge needs no grease, making the unit maintenancefree Cartridges are available to handle loads up to 90,000 lb/in.2 and come in sizes ranging from 1-in ID with a 1.75-in OD to 4-in ID with a 4.875-in OD They accommodate shafts or pins ranging from to in (25 to 100 mm) in diameter For best performance, the manufacturer recommends shafts and pins have hardnesses greater than 50 Rc and surface finishes of to 16 μin after plating The manufacturers also recommend potential users consult them for engineering support The cartridges are sealed, so contaminants are not a problem And because they are not metal, there is no galling of the shaft or pin, or corrosion The dimensionally stable cartridges absorb little water and not swell The units also withstand shocks and edge loading RS# 402 Zinc-platedsteel outer shell High-strength Gar-Max self-lubricated bearing (grease free) Industryproven lip seal 18 MACHINE DESIGN.com APRIL 19, 2012 &$!& !!&& "& #&  -$   " - $ -"-  - '-
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&" REPORTER’S NOTEBOOK Engineering salaries STAYING AHEAD OF THE CURVE Despite an iffy economy, engineers continue to earn more money each year, and this year they enjoyed about a 3.3% bump in income Average salary $80,000 $70,000 $60,000 $60,000 $40,000 $30,000 $20,000 $20,000 2007 2008 2009 2010 2011 2012 Year With a couple bumps along the way, average salaries of MACHINE DESIGN survey respondents have grown since 2007 Victoria Burt Contributing Editor Edited by Stephen Mraz and Leland Teschler stephen.mraz@penton.com, leland.teschler@ penton.com For a look at last year’s salary survey, scan this code or go to: http:// machinedesign.com/ article/salary-surveyengineers-pay-gets-backon-track-0419 MACHINE DESIGN.com $50,000 $40,000 Authored by: 20 Average salary for design engineers, project engineers, and R&D engineers APRIL 19, 2012 $10,000 2007 2008 2009 2010 2011 2012 Year For design engineers, project engineers, and those involved in R&D, who make up the bulk of our annual surveys, average salaries have gone up 6.4% over the last six years How you compare? Every year as we prepare the salary survey, we look to the previous year’s responses and say a little prayer that average salaries have gone up in the last 12 months For the most part, they This year, however, average salary for respondents to our survey, largely made up of mechanical and electrical engineers, has edged up 3.3%, going from $83,770 in 2010 to $86,615 in 2011 But that number is simply the average of all responses, including those just starting out, those with 30 years of experience, and even a few retired engineers who are still in it for fun (We exclude unemployed respondents when we calculate the number) The more-interesting and insightful numbers come from drilling down to compare salaries by years of experience, industry, job titles, and geographical regions This year, in addition to analyzing results from the current year, we decided to look at the last six years of salary data to see how salaries have trended over that time span What we found is good news for engineers generally: No matter which way you analyze the numbers,