The specification of drawing data and associated tolerances for involute gears
DUCOP.01
Scope
This Code of Practice lays out a system for the specification of involute gear teeth. Its use is recommended for all drawings of components that comprise one or more such gears. The Code covers the specification of gear geometry, material, accuracy and accuracy standards, and profile and helix modifications.
In some organisations, for example where the data is computer-generated, it is usual practice to incorporate gearing production information such as stage thicknesses onto the design drawing. Since this is only an acceptable practice in the special circumstances of the precise manufacturing route being known to the designer, the additional production engineering data is not covered by this Code, and the information described here all relates to the design drawing (i.e. applies to the finished component).
Introduction
Good drawing practice generally requires that all data needed by the manufacturer (and the inspector) should appear explicitly on the drawing and that no piece of information should be duplicated. The nature of gear geometry and the multiplicity of manufacturing and inspection processes makes it difficult, if not impossible, to follow these precepts fully. They also create difficulties in attempting to completely standardise either the layout of the information on the drawing or the content. As a way round this difficulty the data required has been divided into sections; each section is covered by one of the clauses below.
When the code is invoked, then it becomes mandatory that the drawing covers each section. An entry must be included for each section even if it is a null entry. (See, for example, the note on profile and/or helix modification.) There is, however, flexibility within each section both in the means of presentation and in the detail of the data.
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