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UDC 621.753
IS0
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION
IS0 RECOMMENDATION
R 463
DIAL GAUGES READING
IN 0.01 mm, 0.001 in AND 0.0001 in
1st EDITION
December 1965
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 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 463, Dial Gauges Reading in 0.01 mm, 0.001 and 0.0001 in
was drawn up by Technical Committee ISO/TC 3, Limits and Fits, the Secretariat of which
is held by the Association Francaise de Normalisation (AFNOR).
Work on this question by the Technical Committee began in 1949 and led, in 1960, to
the adoption of a Draft IS0 Recommendation.
In March 1963, this Draft IS0 Recommendation (No. 561) was circulated to all the
IS0 Member Bodies for enquiry. It was approved, subject to a few motications of an
editorial nature, by the following Member Bodies:
Portugal
Australia France
Austria Germany Romania
Greece Spain
Belgium
Burma Hungary Switzerland
Canada India United Kingdom
U.S.S.R.
Chile Italy
Czechoslovakia Japan Yugoslavia
Denmark Norway
Finland Poland
Three Member Bodies opposed the approval of the Draft:
Netherlands, Sweden, U.S.A.
The Draft IS0 Recommendation was then submitted by correspondence to the IS0
Council, with decided, in December 1965, to accept it as an IS0 RECOMMENDATION.
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CONTENTS
, . . . . . . . l . . . . . . . . . . . . . . . . . . . . . , .
1. General . . .
1.1 Scope .
1.2 Definition
5
2. Specifkation .
5
..............................
2.1 Design features
................. 5
2.1.1 General dimensions and designations
............................... 5
2.1.2 Dial
5
2.1.3 Pointer .
..................... 7
2.1.4 Useful travel of the plunger
7
............................
2.1.5 Zero setting
7
2.1.6 Plunger contact point .
7
...........................
2.1.7 Fixing devices
7
2.2 Quality characteristics .
7
...........................
2.2.1 Repeatability
7
2.2.2 Accuracy .
.......................... 8
2.2.3 Measuring force
3. Methods of Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 General arrangements for tests . . . . . . . . . . . . . . . . . . . . . . .
3.2 Repeatability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3 Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4 Measuring force . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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lSO/R463=1965(E)
R 463
IS0 Recommendation December 1965
DIAL GAUGES READING
IN 0.01 mm, 0.001 in AND 0.0001 in
1. GENERAL
1.1 scope
The object of this IS0 Recommendation is to establish the most important dimensional and
functional characteristics of 0.01 mm, 0.001 in and 0.0001 in dial gauges and to give certain
recommendations on characteristics of accuracy.
Tests for checking these characteristics are described.
This IS0 Recommendation may later be completed to include other indications concerning
(a) 0.001 mm dial gauges,
(b) a range of recommended contact point radii,
(c) establishment of a common range of external diameters of the case,
(d) particulars concerning the graduation and numbering of dials.
1.2 Definition
A dial gauge is a measuring instrument in which the displacements of a plunger are trans-
mitted by suitable mechanical means to a pointer which moves in front of a circular dial
graduated in equal divisions over the whole of its circumference.
In 0.01 mm dial gauges, each division corresponds to a displacement of the plunger of
0.01 mm. Two types of dial gauges graduated in accordance with the inch system are recog-
nized: the 0.001 in dial gauge, in which each division corresponds to a displacement of the
plunger of 0.001 in and which is sometimes subdivided to 0.0005 in, and the 0.0001 in dial
gauge in which each division corresponds to a displacement of the plunger of 0.0001 in.
All three types may be provided with a revolution-counting device in which an auxiliary
pointer moves in front of a scale which indicates the total number of revolutions of the
main pointer or the linear displacement of the plunger.
2. SPECIFICATION
A dial gauge may be regarded as satisfactory, at any time in its service, if it meets the requirements
below:
Design features,
Quality characteristics.
2.1 Design features
2.1.1 General dimensions and designations
See Figure, page 6.
2.1.2 Dial
The dial should be graduated with sharp lines which contrast with the background,
permitting ease of reading. The interval between graduations should never be less than
1 mm (0.04 in).
2.1.3 Pointer
The pointer should move in a clockwise direction, when the plunger is pressed in.
The dial gauge should be so made, or capable of such adjustment, that when the plunger,
in a completely free state, is pressed in, the pointer has a traverse of at least l/10 of a
revolution before its tip passes for the first time over the point of the dial farthest from
the contact point of t
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