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Assuring Molded Accuracy of Plastic Involute Worm Gears

[+] Author Affiliations
Michael T. Weiss, Roderick E. Kleiss

Kleiss Gears, Inc., Grantsburg, WI

Paper No. DETC2007-34155, pp. 193-198; 6 pages
  • ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
  • Volume 7: 10th International Power Transmission and Gearing Conference
  • Las Vegas, Nevada, USA, September 4–7, 2007
  • Conference Sponsors: Design Engineering Division and Computers and Information in Engineering Division
  • ISBN: 0-7918-4808-6 | eISBN: 0-7918-3806-4
  • Copyright © 2007 by ASME


Many plastic geared transmissions contain crossed-axis worm drives in the first stage. The purpose is usually to achieve high reduction and/or tailored package size. The need for precision control of worm and helical gear geometry is just as important for this gear mesh as for any other. A myriad of molded flaws can degrade or destroy the performance of these gears. Pitch, tooth thickness, and lead errors are only a few possibilities. Barrel shaped, tapered, or hourglass bodies must be identified and controlled. Asymmetrical teeth are a distinct possibility as well. The only proper way to detect and evaluate these conditions is to scan and analyze these gears in three dimensions. The traditional method of scanning only one section of the tooth on a worm and then scanning the lead at the pitch line will not reveal many molded gear error sources. Measuring pitch or tooth thickness by taking single point measurements around the gear will also miss many errors. We have developed scanning and analysis techniques to accurately map the size and accuracy of these truly three-dimensional involute gear shapes.

Copyright © 2007 by ASME



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