racy documents correlate as shown in Figure 1. Current Status of New Standards. In late , the new tangential accuracy stan- dard ANSI/AGMA A AGMA A01 (R). Accuracy Classification System – Tangential Measurements for Cylindrical Gears. standard by American Gear. CONTAINS ANSI/AGMA A ACCURACY CLASSIFICATION SYSTEM- TANGENTIAL MEASUREMENTS FOR CYLINDRICAL GEARS AND AGMA.
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This standard does not provide tolerances relating these tests to gear accuracy. Backlash is only present when one gear mates with another. It specifies definitions for gear tooth accuracy terms, the structure of the gear accuracy grade system, and allowable values. It is defined by specification of datum surfaces. Second, the tolerance calculated will reflect the actual gear parameters. In such cases, it is possible to modify the accuracy grade to include an accuracy grade for each gear element or composite tolerance.
Master gears of accuracy grade 2 are recommended for verifying gear testers and checking production gears primarily of grades 4 and 5.
It is also advantageous to be able to view the test data with different or no mathematical filtering applied. Ten accuracy grades are provided in this standard, numbered A2 through A11 in order of decreasing precision. Common metrology practice is to measure in a direction normal to the surface being tested. Measurements taken in this direction have the following characteristics: The scope of applicability has been expanded; Revisions have been made to the formulae which define the flank tolerances; Annexes have been added to describe additional methods for analysis of modified profiles and helices; The evaluation of runout, previously handled in ISOhas been brought back into this part of ISO This modification is called low–pass filtering.
For example, when testing helix with a normal direction of measurement within the base tangent plane the measurement values must be divided by the cosine of the base helix angle to compensate those values to the transverse plane as required by clauses 3 and 7. Distinction is not made as to the direction or algebraic sign of this reading.
The measurement of gearing mated in an assembly for a specific application is beyond the scope of this document.
Therefore this parameter is only applicable to gears with 12 or more teeth. Process control includes elements such as manufacturing planning, maintenance of machine tools, cutting tool selection and maintenance, heat treatment control, and accuracy assurance programs, as needed, to achieve and maintain the necessary gear accuracy.
For unilateral one sided tolerances: Usually, a specific master is required for each different production agmq design. Helix inspection includes total deviation, Fb, form deviation, ffb, and slope deviation, fHb. Some design and application considerations may warrant measuring or documentation not normally available in standard manufacturing processes.
ANSI AGMA A01_百度文库
We have no amendments or corrections for this standard. Deviations are measured in terms of angular displacement and converted to linear displacement at the pitch radius. In such a case, the purchaser must agree on the details of the additional specifications concerning how the matching is to be performed and verified. This test can include the effect of tooth element variations, such as a variation in helix. The use of the accuracy grades for the determination of gear performance requires extensive experience with specific applications.
The actual filter type and attenuation should be indicated on the data sheet.
A New Standard in Gear Inspection
Annex 20151–a01 provides guidance on filtering and information on comparison of gear inspection methods. This standard is also available to be included in Standards Subscriptions.
The functional backlash is dependent upon the tolerances of tooth thickness, runout, tooth geometry, and center distance. This standard provides tolerances for unassembled gears.
This annex provides a rule of thumb to determine the accuracy levels needed to meet the statistical requirements. Gear design is beyond the scope of this standard. An unfortunate effect of RC electrical filtering is a phase shifting of data that can influence analysis of test results. Need more than one copy?
When converted to angular units of measure, they correlate well with transmission errors.
These tolerances are applicable to the following ranges: Continuous Cooling Transformation Diagrams. This includes the gear blank tolerances see AGMA A99 and other gear tooth tolerances listed in this standard.