Revised Standard from Last Update.

NATIONAL FOREWORD

This Indian Standard (Second Revision) which is identical with ISO 666 : 2012 ‘Machine tools — Mounting of grinding wheels by means of hub flanges’ issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on recommendation of the Abrasives Sectional Committee and approval of the Production and General Engineering Division Council.

This standard was originally published in 2002 and subsequently revised in 2013 which was identical with ISO 666 : 2006. The second revision of this standard has been under taken to align it with the latest version of ISO 666 : 2012.

The major changes in this revision are as follows:

a) In 4.2, Fig. 1, the tolerance class of the outer diameter, DH2, of the fixed flange has been changed to f6; consequently, the tolerance class of the outer diameter, DH1, of the loose flange has been changed to e7, in order to avoid possible safety problems, in particular, for bonded abrasive products in cases where the minimum permitted clearance between the hole, H, of the grinding wheel and the diameter, DH2, of the flange is reached and can lead to tangential tensile stress in the wheel; and

b) In 4.2, Fig. 1, the tolerance for the concavity of the flange’s part supporting the wheel has been reduced, in order to obtain a better distribution of the tightening forces on the wheel’s contact surface.

The text of ISO Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain terminologies and conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following:

a) Wherever the words ‘International Standard’ appear referring to this standard, they should be read as ‘Indian Standard’.

b) Comma (,) has been used as a decimal marker, while in Indian Standards, the current practice is to use a point (.) as the decimal marker.