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Tooth Proportions for Plastic Gears
National ANSVAGMA 1006-A97
Standard APP roval of an American National Standard requires verification by ANSI that the requirements
for due process, consensus, and other criteria for approval have been met by the
standards developer.
--
Consensus is established when, in the judgment of the ANSI Board of Standards Review,
substantial agreement has beenreached by directly and materially affected interests.
Substantial agreement means much more than a simple majority, but not necessarily unanimity.
Consensus requires that all views and objections be considered, and that a
concerted effort be made toward their resolution.
The use of American National Standards is completely voluntary; their existence does not
in any respect preclude anyone,whether he has approved the standards or not, from
manufacturing, marketing, purchasing, or using products, processes, or procedures not
conforming to the standards.
The American National Standards Institute does not develop standards and will in no
circumstances give an interpretation of any American National Standard. Moreover, no
person shall have the right or authority to issue aninterpretation of an American National
Standard in the name of the American National Standards Institute. Requests for interpretation
of this standard should be addressed to the American Gear Manufacturers
Association.
CAUTION NOTICE: AGMA technical publications are subject to constant improvement,
revision, or withdrawal as dictated by experience. Any person who refers to any AGMA
TechnicalPublication should be sure that the publication is the latest available from the
Association on the subject matter.
[Tables or other self-supporting sections may be quoted or extracted. Credit lines should
read: Extracted from ANSI/AGMA 1006-A97, Tooth Proportions for Plastic Gears, with
the permission of the publisher, the American Gear Manufacturers Association, 1500 King
Street, Suite 201,Alexandria, Virginia 22314.1
_
Approved August 7,1997
ABSTRACT
This standard presents a new basic rack, AGMA PT, which, with its full round fillet, may be preferred in many
applications of gears made from plastic materials. It also explains and illustrates the general concept of the
basic rack. It contains a description, with equations and sample calculations, of how the proportions of a spur orhelical gear may be derived from the design tooth thickness and the basic rack data. These equations and
calculations use traditional AGMA symbols and inch units. In several annexes, there are discussions of possible
variations from this basic rack and also a procedure for defining tooth proportions without using the basic
rack concept.
Published by
American Gear Manufacturers Association
1500King Street, Suite 201, Alexandria, Virginia 22314
Copyright 0 1997 by American Gear Manufacturers Association
All rights reserved.
No part of this publication may be reproduced in any form, in an electronic
retrieval system or otherwise, without prior written permission of the publisher.
Printed in the United States of America
ISBN: l-55589-684-7
ii
Licensed to Delphi Corporation/ErikaRoyval
ANSI Store order #X322416 Downloaded: 2/1/2007 5:02:46 PM ET
Single user license only. Copying and networking prohibited.
AMERICAN NATIONAL STANDARD ANSI/AGMA l006-A97
Contents
Page
Foreword ................................... . .
1 Scope.. ............................... . .
2 Definitions and symbols .................. . .
3 Tooth proportions and basic rack .......... . .
4Standard basic rack for plastic gears ....... . .
5 Gear tooth proportions from basic rack data . .
Tables
1 Nomenclature: symbols and terms . . . . . . . . . . . .
2 Standard basic racks (based on unit pitch) . . . . . .
. .
. .
. .
. .
. .
. .
. . . . ............ iv
. . . . ............ 1
. . . . ............ 1
. . * . ............ 3
. . . . ............ 3
. . . . ............ 8...
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