AGMA 915-2-A05 pdf free.Inspection Practices – Part 2: Cylindrical Gears – Radial Measurements.
3.1 Symbols and terms
The symbols and terms used throughout this information sheet are in basic agreement with the symbols and terms given in AGMA 900-G00. Style Manual for the Preparation of Standards, and ANSI/AGMA 101 2-G05, Gear Nomenclature, Definition of Terms with Symbols. In all cases, the first time that each symbol is introduced, it is defined and discussed in detail.
NOTE: The symbols and definitions used in this information sheet may differ from other AGMA standards. The user should not assume that familiar symbols can be used without a careful study of their definitions.
The symbols and terms are listed in alphabetical order by symbol in table 1.
3.2 Definitions
The terms used, wherever applicable, conform to
ANSI/AGMA 1012-G05 and ANSI/AGMA
201 5-2-AXX.
The reference axis of a component is defined by means of datum surfaces. In most cases the axis of the bore can be adequately represented by the axis of the mating product arbor (see AGMA 91 5-.3-A99).
The geometric axis of the teeth for radial composite deviation is that axis which, if used for the measurement, would give the minimum root mean square (rms) total radial composite deviation over a complete revolution.
4 Measurement of radial composite deviations
There are two composite measurement methods for gear inspection. This information sheet contains a description of the double flank composite action test, which measures variations in the center distance (radial direction) as a gear rotates in tight mesh with a master gear. The single flank composite action test measures transmission error in the tangential direction with gears that are not in tight mesh, and is described in ANSI/AGMA 2015-1-AOl and AGMA 915-1 -A02.
4.1 Checking principle
Radial composite deviations are checked on a device on which pairs of gears are assembled with one gear on a fixed spindle, the other on a spindle carried on a slide provided with a spring arrangement enabling the gears to be held radially in close mesh (see figure 1). The variations in center distance, which occur as the gears are rotated together in tight mesh, are recorded. This recording may be done manually while observing a dial indicator, with a stylus on a chart, or electronically.
Gear deviations evaluated by the composite action test are tooth-to-tooth composite deviation and total radial composite deviation. In certain cases, functional tooth thickness and radial runout can also be evaluated.
For most inspection purposes, product gears are tested against a master gear. Measured composite errors always include deviations associated with the master gear. Minimizing master gear deviations allows more of the tolerance for errors in the product gears.AGMA 915-2 pdf free download.