IS 3681 : 1995 Gears - Cylindrical Gears - Accuracies

1 Scope

1.1 This Indian Standard covers the general accuracy forcylindrical gears of involute, modified involute flank forms,comprising of gears with straight or inclined teeth for connectingparallel shafts.

1.2 This standard also covers the tolerances for gear teeth oncylindrical gears of module 1 to 70 and with reference circlediameter up to 10 000 mm, graded in 12 gear tooth qualities. Thetolerances apply regardless of the pressure angle.

In the case of racks, the tolerances for their teeth shall notexceed those for the teeth of the mating gear. If the details ofmating gear is not known the rack length should be taken equal tothe circumference of the mating gears.

Note - This standard has been based on the assumption that thegears shall be suitably supported on shafts of ample size and shallbe provided with efficient thrust bearings where required; and theyshall be effectively lubricated.

2 References

IS 919 : Part 2 :1993 ISO System of limits and fits:Part 2 Tables of standard tolerance grades andlimit deviations for holes and shafts

IS 2535 :1978Basic rack and modules for cylindrical gears forgeneral engineering and heavy engineering