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UDC 621.9
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IS0
I N TE R N AT1 O N A L
ORGANIZATION FOR STAND AR D IZ AT I O N
I SO R E CO M M EN DATI O N
R 447
DIRECTION OF OPERATION OF MACHINE TOOL CONTROLS
1st EDITION
October 1965
COPYRIGHT RESERVED
The copyright of IS0 Recommendations aiid IS0 Standards
belongs to IS0 Member Bodies. Reproduction of these
documents, in any country, may be authorized $herefore only
by the national standards organization of that country, being
a member of ISO.
For each individual country the only 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 447, Direction of Operation of Machine Tool Controls,
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 1952 and led, in 1962,
to the adoption of a Draft IS0 Recommendation.
In October 1963, this Draft IS0 Recommendation (No. 624) 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:
Argentina Hungary Sweden
Austria India Switzerland
Belgium
Italy U.A.R.
Czechoslovakia Japan United Kingdom
Denmark Korea, Rep. of U.S.A.
Finland Netherlands U.S.S.R.
France New Zealand Yugoslavia
Germany Poland
Greece Spain
No Member Body opposed the approval of the Draft.
The Draft IS0 Recommendation was then submitted by correspondence to the IS0
Council which decided, in October 1965, to accept it as an IS0 RECOMMENDATION.
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IS0 / R 447 - 1965 (E)
IS0 Recommendation R 447 October 1965
DIRECTION OF OPERATION
OF MACHINE TOOL CONTROLS
1. SCOPE
This IS0 Recommendation is concerned solely with the choice of the direction of operation of
controls whose function is to produce movement of controlled machine tool components in one
or other of two opposing directions.
Consequently, its scope does not include controls for components which rotate continuously in
the same direction during the normal functioning of the machine (such as controls for electric
motors).
2. GENERAL RULES
.
The rules included in this IS0 Recommendation are applicable generally to new series of machine
tools and also as far as possible to existing series.
It may be, however, that in certain cases they cannot be applied; the departure from the rule
should then be made clear by showing on the machine indicator plate the directions of operation
of the contro
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