ISO/TR 8865:1990

ISO/TR
TECHNICAL
REPORT
First edition
1990-12-01
Mining - Guidance on methods of verifying
dimensions of sprocket assemblies for chain
conveyors
Reference number
IS0 8865 : 1990 (El
ISO/TR 8865 : 1990 (E)
Foreword
IS0 (the international Organization for Standardization) is a worldwide federation of
national standards bodies (IS0 member bodies). The work of preparing International
Standards is normally carried out through IS0 technical committees. Each member
body interested in a subject for which a technical committee has been established has
the right to be represented on that committee. International organizations, govern-
mental and non-governmental, in liaison with ISO, also take part in the work. IS0
collaborates closely with the International Electrotechnical Commission (IEC) on all
matters of electrotechnical standardization.
The main task of IS0 technical committees is to prepare International Standards. In ex-
ceptional circumstances a technical committee may propose the publication of a
Technical Report of one of the following types:
-
type 1, when the required support cannot be obtained for the publication of an
International Standard, despite repeated efforts;
-
type 2, when the subject is still under technical development or where for any
other reason there is the future but not immediate possibility of an agreement on an
International Standard;
-
type 3, when a technical committee has collected data of a different kind from
that which is normally published as an International Standard (“state of the art”, for
example).
Technical Reports of types 1 and 2 are subject to review within three years of publica-
tion, to decide whether they can be transformed into International Standards.
Technical Reports of type 3 do not necessarily have to be reviewed until the data they
provide are considered to be no longer valid or useful.
ISO/TR 8865, which is a Technical Report of type 3, was prepared by Technical Com-
mittee ISO/TC 82, M/‘nlng, Sub-Committee SC 2, Components of coalface machinery
using high-tensile round link chains.
International Standard IS0 5613 : 1984 covering drive sprocket assemblies for mining
chain conveyors specifies requirements for a range of sprocket assemblies for use with
twin outboard assemblies. These assemblies incorporate sprocket rings designed to
accept chains complying with IS0 610, shackle type connectors complying with
IS0 1082 and scraper bars complying with IS0 5612.
The dimensions of the component parts of the sprocket assembly are laid down in
IS0 5613 and these dimensions have to be verified in order to check compliance with
the standard. It is stated that the methods to be used for the verification of the dimen-
sions shall be agreed between the purchaser and the manufacturer (IS0 5613 : 1984,
4.3). A number of the dimensions specified, in particular those relating to the tooth
profile of the sprocket, cannot be measured by the direct application of conventional
measuring instruments and it was decided to give some guidance on the special techni-
ques involved.
The member bodies participating in the work of lSO/TC 82/SC 2 studied the problem
and it was found that a number of varying methods and instruments were used, all
equally satisfactory if the appropriate dimensions were controlled to ensure com-
patibility with the other components of the chain assembly.
The committee therefore came to the conclusion that no one method or instrument
need be adopted as the “standard” method but guidance would be helpful on certain
general principles and essential features of the checking gauges. This document is
therefore published in the form of a Technical Report rather than an International
Standard.
0 IS0 1990
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