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March/April 2012 C O N T E N T S FEATURES 33 The Plastic Gear Pay-Off The plastic gear market is strong— and growing. 43 Manufacturer’s Guide to Heat Treating Large Gears The unique challenges of heat treating large gears. TECHNICAL ARTICLES 29 Ask the Expert New this issue: Industry experts answer your questions on all things gearing. 50 Controlling Gear Distortion and Residual Stresses During Induction Hardening in Loaded Spur Gears Gear distortion, residual stresses controlled with spray nozzle configuration designed to quench gear surfaces with different cooling rates. 58 Relative Performance of Spur Gears Manufactured from Steel and PEEK Test data compared, contrasted to determine performance of steel-plastic and plastic-plastic gear combinations. Photos courtesy of Metlab Vol. 29, No. 2 GEAR TECHNOLOGY, The Journal of Gear Manufacturing (ISSN 0743-6858) is published monthly, except in February, April, July and December by Randall Publications LLC, 1840 Jarvis Avenue, Elk Grove Village, IL 60007, (847) 437-6604. Cover price $7.00 U.S. Periodical postage paid at Arlington Heights, IL, and at additional mailing office (USPS No. 749-290). Randall Publications makes every effort to ensure that the processes described in GEAR TECHNOLOGY conform to sound engineering practice. Neither the authors nor the publisher can be held responsible for injuries sustained while following the procedures described. Postmaster: Send address changes to GEAR TECHNOLOGY, The Journal of Gear Manufacturing, 1840 Jarvis Avenue, Elk Grove Village, IL, 60007. Contents copyrighted ©2012 by RANDALL PUBLICATIONS LLC. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or by any information storage and retrieval system, without permission in writing from the publisher. Contents of ads are subject to Publisher’s approval. Canadian Agreement No. 40038760. 2 GEARTECHNOLOGY March/April 2012 www.geartechnology.com
Customers Say it Best “To remain competitive in today’s gear market, manufacturers must upgrade technology to increase efficiencies and productivity. Giuliante Machine Tool, Inc. has done that with the purchase of a NILES ZE 400 Gear Profile Grinding Machine The Niles ZE 400 has proven to be a very flexible machine which grinds internal and external gears efficiently and at very high quality levels. On-board inspection and multi-wheel grinding configurations have helped slash cycle times on several projects. The intuitive, conversational control makes learning the machine easy. The Niles ZE 400 has allowed us to position ourselves among today’s leading gear manufacturers.” Giuliante Machine Tool, Inc. is happy to celebrate its 34th anniversary and relocation to a 30,000 square foot state-of-the-art facility in Peekskill, NY. Visit them at www.gmtgear.com. The testimony of our customers reflects our mission. Ninety six of every one hundred KAPP and NILES machines delivered in North America since 1980 are still generating profits for our customers today. When you purchase a KAPP or NILES machine, you get a commitment for support that does not expire. G e a r e d t o m a k e t h i n g s m o v e . KAPP Technologies 2870 Wilderness Place Boulder, CO 80301 Phone: (303) 447-1130 Fax: (303) 447-1131 www.kapp-usa.com info@kapp-usa.com
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Page 34 and 35: Vacuum Furnace Innovations Providin
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Page 43: The race is on for quieter, smoothe
Page 46 and 47: Heat Treating Large Gears What meth
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