Code of inspection practice - Part 1: Measurement of cylindrical gear tooth flanks

SCOPE

This document supplements ISO 1328-1:2013. It provides a code of practice dealing with measurements on flanks of individual cylindrical involute gears, i.e. with the measurement of pitch, profile, helix and tangential composite characteristics. It describes measuring equipment, provides advice for gear measuring methods and for the analysis of measurement results, and discusses the interpretation of results.

Measurements using a double flank tester are not included (see ISO/TR 10064-2). This document only applies to involute gears.

BACKGROUND

The purpose of this document is to provide background information that will assist with understanding the requirements, implementation and effectiveness of the gear measurements needed to establish the gear classifications defined in ISO 1328-1. This information will assist those involved in gear design and specification, gear manufacture and gear measurement processes. It includes background information and guidance on good measurement practice and addresses the interpretation of measurement results to identify common causes of gear manufacturing errors. Improved knowledge of gear measurement processes enhances the value of investments in measuring equipment.

When producing multiple identical gears in a large batch, it is rarely necessary or economical to measure all possible deviations on all the gears manufactured. Stable manufacturing processes allow a relatively small number of samples to be measured and still ensure that the required tolerance class is maintained. Certain elements may not significantly influence the function of the gear under consideration. However, some gear manufacturing processes are known to increase the risk of significant variation in tooth geometry in a single gear and thus require additional measurements to verify gear geometry parameter tolerances have been achieved. Some guidance is provided when this is necessary, but it remains the responsibility of the manufacturer of the gears to assure that the gears satisfy the specified requirements, such as those in ISO 1328-1. It is recommended that measuring plans be agreed upon between the manufacturer and the purchaser.

OTHER INFO

The committee responsible for this document is ISO/TC 60, Gears.

This third edition cancels and replaces the second edition (ISO/TR 10064-1:2017), of which it constitutes a minor revision. In addition to minor editorial corrections and clarifications, the changes compared to the previous edition are as follows:

—    consistently referring to the “reference diameter” and eliminating references to the outdated term “standard pitch diameter”;

—    clarifying what “adjacent pitch deviations” are in 6.2.3.3;

—    in 9.1.1, clarifying that what is specified is the design profile;

—    in 9.2.1, clarifying that what is specified is the design helix;

—    adding chamfers to the list of things in 9.2.2 that can be detected on a helix deviation chart;

—    in Figures 54 and 55 adding that the grinding fillet is produced by the finishing tool while the root is created by the pre-finishing tool;

—    a factor of 10-3 was added to Formula (43) to account for the specified units.