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IS0
I Z AT I O N
I N T ERN AT I O N A L ORGANIZATION FOR STAND A RD
Is0 RECOMMENDATION
R 666
MOUNTING OF PLAIN GRINDING WHEELS
BY MEANS OF HUB FLANGES
1st EDITION
February 1968
COPYRIGHT RESERVED
The copyright of IS0 Recommendations and IS0 Standards
belongs to IS0 Member Bodies. Reproduction of these
documents, in any country, may be authorized therefore only
by the national standards organization of that country, being
a member of ISO.
For each individual country the oniy valid standard is the national standard of that country.
Printed in Switzerland
Also issued in French and Russian. Copies to be obtained through the national standards organizations.
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BRIEF HISTORY
The IS0 Recommendation R 666, Mounting of plain grinding wheels by means of hub
flanges, was drawn up by Technical Committee ISO/TC 39, Machine tools, the Secretariat
of which is held by the Association Française de Normalisation (AFNOR).
Work on this question by the Technical Committee began in 1951 and led, in 1965, to the
adoption of a Draft IS0 Recommendation.
In February 1966, this Draft IS0 Recommendation (No. 984) was circulated to all the IS0
Member Bodies for enquiry. It was approved, subject to a few modifications of an editorial
nature, by the following Member Bodies :
Israel Sweden
Austria
Belgium Italy Switzerland
Brazil Japan Turkey
Chili Korea, Rep. of U.A.R.
Netherlands United Kingdom
Czechoslovakia
Poland U.S.S.R.
France
Hungary Portugal Yugoslavia
India Spain
Two Member Bodies opposed the approval of the Draft:
Germany
U.S.A.
The Draft IS0 Recommendation was then submitted by correspondence to the IS0
Council, which decided, in February 1968, to accept it as an IS0 RECOMMENDATION.
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ISO/R 666 - 1968 (E)
February 1968
IS0 Recommendation R 666
MOUNTING OF PLAIN GRINDING WHEELS
BY MEANS OF HUB FLANGES
1. SCOPE
The object of this IS0 Recommendation, which applies to the mounting of grinding wheels by
means of hub flanges, is to specify, having regard to safety requirements, the dimensions of
interchangeability between hub flanges and grinding wheels.
It is applicable to the following types of plain grinding wheels, having bores between 76.2 and
508 mm (3 and 20 in):
- fettling and sharpening plain wheels,
- plain wheels for external cylindrical grinding (except centreless)
- surface plain grinding wheels.
The requirements of this IS0 Recommendation provide for complete interchangeability between
the components (grinding wheels and hub flanges) regardless of whether they are manufactured
to metric or inch dimensions.
2. GENERAL
The dimensions specified in this IS0 Recommendation, together with the manufacturing require-
ments and checks to be made before use given below, have been determined taking into account
the conditions necessary for ensuring safe assembly of the grinding wheels and the hub flanges,
these conditions being as follows for the external diameter H of the hub flanges and for the radial
width R of their gripping rim:
(U) The value of R should be great enough to ensure a sufficient contact surface, but small
enough to maintain a sufficient clamping pressure and to reduce the risks of abnormal
stress due to imperfect flatness of the grinding wheel.
(b) The difference between the internal diameter H - 2R of the gripping rim and the
bore A of the grinding wheel should be equal to at least 12 mm (1/2 in).
(c) The difference between the recess diameter of recessed grinding wheels and the dia-
meter H of the hub flanges should be equal to at least 10 mm in).
Important Note. - It is considered essential that the regulations in force at the present time in
various countries should be brought into line with the safety requirements thus defined, parti-
cularly with regard to the values of dimensions R and H. The retention of values of Hgreater than
those given in this IS0 Recommendation, far from improving safety, would have the opposite
effect, and would adversely affect both
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