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In some cases, the loaded side may agms specified to a higher accuracy than the nonloaded or minimum–loaded side; if applicable, this information is to be specified on the gear engineering drawing see 4. If the document is revised or amended, you will be notified by email. The limits were established to set the tolerances at points that the committee thought were valid.
This technology requires suitable software and careful procedures; the alternative, which is more common, is to inspect the tooth shape with contact pattern testing. The total composite variation was read as the difference between the highest to lowest point on the chart.
This difference is recorded as an analog waveform and comes out of the instrument on a strip chart, as shown in figure C. Special consideration must be given for gears which have a large chamfer at the top corner of the toe or heel; it may be preferential to increase the distance from the heel and toe rather than increase the distance from the top land. agms
Practices and measurement methods are included which are recognized and accepted throughout the gear industry as being reliable.
The backlash is read from the indicator, and the measurement procedure is normally repeated 3 or 4 times at equally spaced increments around the gear.
This measurement technique may be applied to soft non–heat treated and hard heat treated bevel pinions and gears, and is useful for manufacturing corrections, heat treat distortion evaluations, fitness–for–use decisions, etc. Need more than one copy? See annex B, figure B. The variations in mounting distance, which occur as the gears are rotated together in tight mesh, are either recorded on a chart or require the reading of a dial indicator.
If a recorder is employed, it is desirable to have a definite relationship between the position on the agna and a circumferential position on either the work gear or reference gear. Provision is required for the work and reference gears to rotate with a minimum of runout or wobble. When checking bevel gears where the opposite sides of the teeth have been cut by different machine setups, the single probe ball check is agja valid.
Some of the symbols and terminology contained in this document may differ from those used in other documents and AGMA standards. Mounting distance Mounting distance Mounting distance variation resulting from runout run in tight mesh Figure 16 — Mounting distance and variation measurement 5. The software must be compatible with the coordinate data provided by the gear engineer. Interpretation of composite data.
In addition to AGMA However, for results to be repeatable the following conditions must be clearly defined: Credit lines should read: When the process drifts or goes out aggma control, elemental checks must be made to determine which parameter is causing the improper condition.
Bevel Gear Classification, Tolerances, and Measuring Methods
Measurements in other axes must be either corrected or agreed upon in order to use the tolerances. The single flank test is run using encoders or other devices to measure rotational motion. A reference gear is a gear of known accuracy agms is designed specifically to mesh with the gear to be inspected for composite variation. For smaller gears the 309.03 in tolerance as diameter decreases is less than ISOthe resulting value is atma higher for a given diameter.
The generally accepted procedure for bevel gear CMM measurement is to mathematically define the theoretical flank shape in three dimensions, measure a set of individual points with a suitable CMM with associated special software, output the results in a numerical format with a corresponding topological graph, then compare agmma actual measured and theoretical surfaces. Page numbers in the text of the Standard are unchanged. In addition, the agna adjustment of the pinion is used to simulate the same effect on the tooth contact as a change in pressure angle; the axial adjustment of the gear is used to control backlash, and the vertical offset of the axes to simulate the same effect on the tooth contact as a change in spiral angle.
This standard is also available to be included in Standards Subscriptions. Experienced personnel, using calibrated instruments in a suitable environment, are required.
In some applications, perfect involutes are desirable.
Tolerance system development and comparison. Applicable definitions are provided. These tables are calculated from the equations in 7. Example of statistical process control SPC application. Visually inspect the contact pattern to evaluate the length, width, shape and position. This annex is provided for those who prefer to use tables rather than computation for the values of the Table D. Shigley 9E SI Chap Data from encoders is processed in an instrument that shows the agna or smoothness of rotational motion resulting from the meshing of the gears transmission variations.
This would result in charts as shown in figure H. These software packages also have the capability to check tooth thickness. This device has two vernier scales: This standard provides tolerances for unassembled gears only. The location agja the tooth thickness measurement must be specified by the gear engineer; typically, this is at the center of the tooth flank where it is the least affected by modifications to tooth shape which are often specified to provide proper contact characteristic under load.
In this standard, lower AGMA accuracy grades designate higher precision in order to be consistent with international standards.
Item Detail – AGMA
Manual interpretation can be done by drawing in the upper and lower envelope of the measured data. Guidelines for ball probe comparison of tooth size: The equation for the total double flank abma tolerance for a gear greater than mm in diameter is identical to the corresponding equations in ISO Consensus requires that all views and objections 39.03 considered, and that a concerted effort be made toward their resolution.
This method is usually applied only to the first gears cut.
Applications requiring high accuracy gearing may necessitate the matching, or modifying, of pinion and gear profiles and 39003 angles such that the matched set is satisfactory for the application.