ISO 1328-1:2013 pdf free

ISO 1328-1:2013 pdf free.Cylindrical gears一ISO system of flank tolerance classification
In certain applications there can be additional characteristics that might require tolerances in order to ensure satisfactory performance. For example, if dimensions for tooth thickness or surface finish tolerances are desirable in order to ensure satisfactory performance in special applications, such dimensions and tolerances should appear on drawings or purchase specifications. Methods of measuring some of these characteristics are discussed in ISO/TR 10064-1, and in Annexes D to G.
Throughout this part of ISO 1328, all the figures show how the design or measured profile deviates from a theoretical pure involute with the design pressure angle or how the design or measured helix deviates from a theoretical pure helix with the design helix angle. The figures show the profile and helix as generally horizontal lines, so as not to require indication of left or right flank or internal or external gear. Most measuring machines display the profile and helix as generally vertical lines; the orientation is not important.
This annex applies to gears with either a crowned profile (sometimes called barrelling) or a crowned helix, or to gears with both. A second order best fit is applied to the deviations from the unmodified profile or the unmodified helix. The standard flank tolerance classes from Clause 5 may be used with this method of analysis.
NOTE Clauses 3 and 4 use linear analysis of the deviations from the design profile and the design helix rather than a second order fit. The result of the linear analysis is referred to as a mean profile (or helix) line even though it has the same shape as the design profile (or helix), which can be a curve. The result of the second order analysis as presented in this annex is always referred to as a curve.
Mechanical filtering limits the profile and helix measurement data gathered to longer wavelength values and is thus a low-pass type filter. Mechanical filtering occurs as the geometry of the probe (i.e. tip radius) bridges and thereby suppresses the shorter wavelength variations. Another relevant source of mechanical low-pass filtering is the inertial mass of the moving parts of the probing system.
In applications that require inclusion of higher frequency data, smaller probe tip radii can be specified.Since gear profile and helix data are normally subjected to intentional low-pass filtering, this is rarely required. Evaluation of gear surface finish is best accomplished with specialized surface finish instruments, rather than profile or helix measurement instruments.ISO 1328-1 pdf free.