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ForewordISO [the International Organization for Standardization) is a worldwide federation ofnational standards institutes (ISO member bodies). The work of developing Inter-national Standards is carried out through ISO technical committees. Every memberbody interested in a subject for which a technical committee has been set up has theright to be represented on that committee. International organizations, governmentaland non-governmental, in liaison with ISO, also take part in the work.Draft International Standards adopted by the technical committees are circulated 10the member bodies for approval before their acceptance as International Standards bythe ISO Council.International Standard ISO 4468 was developed by Technical Committee ISO/TC 60,Gears, and was circulated to the member bodies in June 1980.It has been approved by the member bodies of the following countr ies :

AustraliaAustriaBelgiumBulgariaCanadaCzechoslova kiaEgypt, Arab Rep. ofFinland

FranceGermany, F.R.HungaryIndiaItalyKorea, Rep. ofNetherlandsPoland

RomaniaSouth Africa, Rep. ofSpainSwedenSwitzerlandUnited KingdomUSSR

The member bodies of the following countries expressed disapproval of the documenton technical grounds:

JapanUSA

lntarnattenal Organization for Standardization, 1982 Printed in Switzerland

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INTERNATIONAL STANDARD ISO 44681982(E)4468-82 I851903 DOj3961 3 - I

Gear hobs - Single start - Accuracy requirements1 Scope and field of applicationThis International Standard specifies requirements for the ac-curacy of general purpose single start hobs of 1 to 40 moduleand 25 to 0,625 diametral pitch.These hobs are intended for producing gears which conform toISO 53 and ISO 54.

This International Standard applies to single start hobs forhelical and straight spur gears. It applies to sol id Imonoblocland inserted blade hobs.The elemental features of hobs are graded as follows accordingto accuracy:

Grade AA, Grade A, Grade B and Grade Cwhere Grade AA is the highest order of precision.NOTE- GradeD hobsarenot specifiedin this InternationalStandard.Thevaluesof the tolerancesfor GradeDare 1,32 timesthe valueof thetolerances for Grade C, except for the bore tolerances which wouldbe H6.In addition to the conventional elemental tests for hobs, thisIntemational Standard gives permitted tolerances for the prac-tical test consisting of the measurement of the position of thecutting edges along a line of action. This test requires specialequipment. The two groups of tests are not equivalent and oneshal l choose between one or the other. If there was no previousagreement, the hob is regarded as belonging to the precisionclass specified, i f it satisfies one or other of the two methods ofinspection.NDTE - The tolerances in this International Standard were deter-minedfor gearhobswhosedimensionsconform to ISO2490, but withcertain precautionsthey maybe applied to hobs not specified in thisInternationalStandard.In this International Standard, the diarnetral pitches are givenonly on a provisional basis; they wil l be deleted after the periodnecessary to al low conversion to the metr ic system.

2 References[SO 3, Preferred numbers - Series of preferred numbers.

1) At presentat the stags of draft. (Revisionof ISO/R 286-1962.)

ISO 17, Guide to the use of preferred numbers and of series ofpreferred numbers.ISO 53, CyfindricBl gear:; for gel/tlml and heavy engineering -Basic rack.ISO 54, Cylindrical gears for general engineering and for heavyengineering - Modules and diametral pitches.ISO 286/1, ISO System for limits and fits - Part 1: Genera/,tolerances and deviations. 1 1 -ISO 701, International gear notationgeometrical data.

Symbols tor

ISO/R 1122, Glossary of gears - Geometrical definit;ons.ISO 2490, Single-start sol id (monobloc) gear bobs with axialkeyway, 1to 20 module and 1to 20 diametra/ pitch - Nominaldimensions.

3 Accuracy requirementsHobs shall conform with the requirements of tab!es 1 and 2 or 3as appropriate.

4 Derivation of tolerances{see table 2)It should be noted that test 7 does not conform to a datumvalue and is not in the statements below concerning grade rela-tionships.With the exception of test 7, the datum from which all thevalues in tables 2 and 3 are derived is the value of 45 [ . . 1m in test14 Grade A module 16-25.The ratio between Grade AA and Grade A is 1,6 except for test9 and 9A where it is 1. The ratio between Grade A and Grade Bis 1,6 for tests 1 and 2 and is 1,8 for tests 3 to 6, and 2 for tests 8to 14. The ratio between Grade B and Grade C is 2 except in thecase of tests 1, 2, 4, 5, 6, 9 and 9A. In this case the ratioadopted is 1 for practical convenience. These ratios are takenfrom [SO 3.

1

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ISO 4468-1982 (E) ------4-4-6-8---8-2----1 4851903 003396-2 5T

The tooth addendum tolerances, test 9A, are related 10 tooth thickness for hobs having a normal pressure angle of Z O o so that:thickness tol eran ceAddendum tolerance = - - - - - -- - - -- - -2 x tanyent pressure angle 120)

The ratios between the various module ranqcs are indicated intest 1 and th is applies to all the other tests except test 7.The metric values are to be taken as the basis of the tables. Theinch units in table 3 are converted from the metric values intable 2. The values for tolerances of 12,5 11mand upwards havebeen rounded off in accordance with ISO 17. The values 4,5,7,5,8.5 and 9,5 11mhave been increased by 0,5 11mon accountof the smallness of the values concerned, this being allowed ac-cording to ISO 17.Inch values of tolerance greater than 0,002 in have beenrounded to the nearest 0,0005 in.

Table 1- Tolerance on boresI AA A B I c IGrade of hob I H5 H5 H6 I H6 ITolerance on bore diameter11

11 In accordance with IS0 286.Standard bores shall be finished straiqht and parallel, within thetolerances given in table 1, for 75 % of each bearing length forGrade AA, A and B hobs and 50 % for Grade C hobs.A reference mandrel of nominal bore diameter shall passthrough the bore as a check of alignment.

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4.1 Key to table 2The datum value for each of the tests rs that for Grade Amodule 16 to 25. These values are derived from the datum valuefor test 14, which is 45 11m, in conjunction with the ratiosspecified below.

= 1,374 x tooth thickness toleranceAs 1,374 approximates to the preferred number 1,4, the latter has been "sed.

2

Test 1 : Bosses; radial run-out (Test 14/3,15).Test 2 : Bosses; axial run-out {Test 14/4).Test 3 : Teeth; radial run-out of tips (Test 14 x 1,6).Test 4 : Cutting faces of gashes; straightness and radial align-ment (Test 14 x 1,251.Test 5 : Cutting faces of gashes; adjacent spacing (Test 14 x1,61.Test 6 Cutting faces of gashes; cumulative spacing (Test14 x 3).Test 7 : Cutting faces of gashes; lead (no relationship toTest 14).Test 8 : Tooth profile at cutting edges (Test 14/2J.Test 8A : Tooth profile at cutting edges (Test 14/1). See notesat end of tabie 2.Test 9 : Tooth thickness (Test 14 x 2,24}.Test 9A' : Tooth addendum (Test 14 x 3,15).Test 10 : Tooth lead; tooth to tooth (Test 14/2,24).Test 11 : Tooth lead; cumulative in one convolution (cyclic)(Test 1411,25).Test 11A : Tooth lead; cumulative in one convolution (cyclic)(Test 14/1,12) . See notes at end of table 2.Test 12 : Tooth lead; cumulative in 3 convolutions {Test 14 x1,4).Test 13 : Tooth spacing along line of action; Tooth to toothITest 14/2,24).Test 14 : Tooth spacing along line of action: cumulative.Datum 45 11m, m > 16 to 25 Grade A.

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