Calculation of quantities associated with gear measurement
DUCOP.07
Scope
This Code of Practice is intended for use once a design (or at least a tentative design) of gear has been established; the starting point for each calculation is the basic gear data. The calculations covered are listed in table 1 below. The calculation number appears at the top right of each sheet. For each calculation there is a formula/calculation sheet with blanks for data entry. These may be copied and used as an aid to calculation.
For those new to some of these calculations, worked examples are provided by means of an addition set of sheets. The blank sheets have the letter C after the calculation number at the top right of the sheet; the worked examples have the letter S.
On each sheet there is a reference to the section in DIN 3960 (English translation of 1980 version) which contains the main formula used by that sheet. It should be noted, however, that all these formulae do appear in other publications (albeit sometimes presented differently) and that it is in any case possible to derive all of them by use of basic geometric and trigonometric rules.
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 often makes it difficult to do this. It is inevitable, therefore, that there will be occasions when it is necessary to augment the data which appears on the drawing even if the drawing complies with these Codes of Practice. It is to assist in these situations and to help at the drawing stage those who do not have access to a suitable computer program that Code 7 has been produced.
The formulae which are necessary to perform these calculations already appear in several published documents. Experience has shown, however, that these can be difficult to use for a specific calculation. In this Code of Practice, all the formulae necessary for the calculation of a particular quantity appear together on one sheet. Since some formulae are required in several calculations, the Code of Practice obviously contains several repetitions of those formulae.
Go to BGA Shop to Order
Index: - Codes of Practice
BGA Home page