Ansi

Tooth Proportions for Plastic Gears
National ANSVAGMA 1006-A97
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[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
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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) . . . . . .
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