AGMA 905-A17 pdf free.AGMA Information Sheet Inspection of Molded Plastic Gears.
The inspection methods described in this document are limited to those specifications that are typically defined on a plastic gear’s drawing. These features are described in AGMA 909. Specifications for Molded Plastic Gears. Other aspects of gear quality are not considered here such as basic material strength, processing influences on strength, surface appearances, surface texture and the presence of flash.
1.2 Types of gears
Inspection methods described here are limited to the most common types of molded plastic involute
gears, namely:
— spur;
— helical;
— cylindrical worm:
— external, internal, and rack forms;
— sector gears.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions of the information sheet. At the time of publication, the editions were valid. All publications are subject to revision, and the users of this information sheet are encouraged to investigate the possibility of applying the most recent editions of the publications listed.
AGMA 909•A06. Specifications for Molded Plastic Gears
ANSI/AGMA 101 2-G05, Gear Nomenclature, Definitions of Terms with Symbols
AGMA 91 5-2-A05, Inspection Practices — Part 2: Cylindrical Gears — Radial Measurements
ANSI/AGMA 2002-Cl 6, Tooth Thickness and Backlash Measurement of Cylindrical Involute Gearing ANSIIAGMA ISO 1328-1-B 14, Cylindrical Gears — ISO System of Flank Tolerance Classification — Part 1:
Definitions and Allowable Values of Deviations Relevant to Flanks of Gear Teeth
ANSI/AGMA 2015-2-B15, Accuracy Classification System – Radial Measurements for Cylindrical Gears.
4 Tooth flank labeling
Modern CNC gear inspection equipment, wtiich is used to report measurements for individual or the full succession of gear teeth, identifies teeth by their count from an initial tooth numbered one. It also identifies the flank of each tooth on which the measurement was made by reference to a left flank and a nght flank”. Identification of each tooth and feature is also essential with other inspection methods, even if the labeling of the measurement data is to be made manually. Identification of the particular cavity and the tooth orientation in that cavity is recommended to correlate the tooth labeling used for inspection.
4.1 ApplIcations
A labeling system imposed on the reported measurement data, accompanied by appropriate marl.ing on the inspected gear, can be applied in several ways.
Any inspection anomalies that stand out in the measurements can be accurately associated with the corresponding tooth surfaces. This permits further examination of those surfaces to help identity the nature and cause of the particular inspection result.
4.2 Labeling systems
Labeling systems defining the direction of the tooth number sequence, clockwise or counter-clockwise, and the flank designation have been established by standards or by inspection equipment design practices. Examples of tooth numbering systems that comply with both AGMA and ISO standards are shown in Figure 1 for external gears and Figure 2 for internal gears. The labeling system needs to be clearly understood by the inspector, designer. molder and tool builder.AGMA 905 pdf free download.