ANSI/AGMA 9112-B15 pdf free download

08-10-2021 comment

ANSI/AGMA 9112-B15 pdf free download.American National Standard Bores and Keyways for Flexible Couplings (Metric Series).
4 Bore measurement and surface finish
4.1 Bore measurement
The hub may distort when the keyway is machined: therefore, the bore diameter must be checked prior to cutting the keyway. See annex A for straight bore inspection methods and annex B for tapered bore methods.
4.2 Bore surface finish
Machined finish bores normally have a surface finish of 3.2 Ra micrometers. For finishes better than 3.2 Ra micrometers. additional processes may be necessary. Keyless fit bores require an improved surface finish, see ANSIIAGMA 9103-B08.
5 Straight (finished) bored hubs
5.1 Standard bores
Standard finished bore sizes and preferred tolerances are shown in Table 2. Keyway tolerances are in accordance with clause 8.
NOTE: A bore size shown in Table 2 may or may not be a stock bore size for each coupling manufacturer.
5.1.1 Hub bore to shaft fit
Hub bore to shaft lit is the responsibility of the purchaser. Table 2 shows the resulting fits of the preferred
shaft/bore combinations.
5.1.2 Standard hub bore to shaft fits
This standard covers three classes of fits, clearance, transitional and interference as shown in Table 2. Additional comblnations of shaft/bore tolerancing and resulting fits, found in various specifications, are given in annex E. Use of the annex E combinations (or others) shall be approved by the coupling manufacturer. The type of hub bore to shaft fit selected is dependent on the type of coupling and service in which the couplings will be used. If a particular type of fit is desired, it shall be specified by the purchaser of the coupling. Clearance fits
Clearance fits are normally used to facilitate assembly and disassembly of coupling hub(s). Factors to be considered when using clearance fits include:
– axial positioning and securing of coupling hubs) during operation;
– when couplings are used for axial location of connected equipment, limited end float;
– the effect of hub bore to shaft clearance on coupling balance and coupling life;
– frettin9 of shaft and hub bore. Transitional fits
Transitional fits result in the possibility of a clearance or interference fit as a result of the tolerances of both shaft and hub bore. The average fit is size on size.
Transitional fits result when H7 bore tolerances are used in conjunction with the shaft tolerances from ISO
R775: 1969. Interference fits
Interference fits are normally used to:
– maintain positive axial location of the hub(s) on the shaft(s) during operation;
– preserve the inherent balance quality of the coupling;
– minimize fretting of the shaft and bore.
Nominal interference fit rate is 0.0005 mm/mm of diameter. Some applications may require an increased interference fit. The coupling purchaser shall advise the coupling manufacturer when an increased interference fit is required. The requirement for increased fits may influence the coupling design and materials selected.
5.1.3 UnspecIfied hub bore to shaft fits
When the purchaser does not specify the hub bore to shaft fit required. the coupling manufacturer will bore the coupling to their standard tolerance in accordance with one of the fits given in Table 2. The purchaser is responsible for the resulting fit.
5.2 Non-standard bores
Non-standard bores are produced to dimensions and tolerances which are outside this standard.
5.3 Set screws
Set screws, when furnished for use with keys, shall be in accordance with each coupling manufacturer’s standard, unless otherwise specified by the purchaser.ANSI/AGMA 9112 pdf download.

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