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IS 10718 (1993): Technical drawings - Dimensions andtolerancing of cones [PGD 24: Drawings]

IS 10718 f 1993 IS0 3040 : 1990

Indian Standard

TECHNICAL DRAWINGS - DIMENSIO-NS AND TOLERANCING OF CONES

( First Revision )

UDC 744’345’2 : 621 :753-l

@ BIS 1993

BUREAU OF INDIAN STANDARDS MANAK BHAVAN, a BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

November 1993 Price Group 3

Drawings Sectional Committee, LM 02

NATIONAL FOREWORD

This Indian Standard ( First Revision ) which is identical with IS0 3040 : 1990 ‘Technical drawings - Dimensioning and tolerancing - Cones’, issued by the International Organization for Standardization ( IS0 ), was adopted by the Bureau of Indian Standards on the recommenda- tions of the Drawings Sectional Committee ( LM 02 ) and approval of the Light Mechanical Engineering Division Council.

The original version of this standard IS 10718 : 1983 Method of dimensioning cones on technical drawings was based on IS0 3040 : 1974 ‘Technical drawings - Dimensioning and tolerancing - Cones’, issued by the International Organization for Standardization ( IS0 ). Consequent to the revision of the IS0 Standard, harmonization of the Indian Standard has been made by the

I adoption of IS0 3040 : 1990.

The text of IS0 standard has been approved as suitable for publication as Indian Standard without deviations. Certain 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 point ( . ) as the decimal marker.

In this adopted standard, there is a reference to IS0 1119 : 1975 and IS0 3461-2 : 1987. The Indian Standard IS 3458 : 1981 ‘Conical tapers and taper angles for genenral engineering purposes ( revised )‘, which is technically equivalent to IS0 1119 : 1975 is to be substituted in its place.

The concerned technical committee has reviewed the provisions of IS0 3461-2 : 1987 referred in this adopted standard and has decided that this is acceptable for use in conjunction with this standard.

1s 10718: 1883 IS0 3040 : 1890

Indian Standard

TECHNICAL DRAWINGS - DIMENSIONS AND TOLERANCING OF CONES

( First Revision )

1 Scope

This International Standard establishes the defi- nition of cones and specifies the graphical symbol to be used for their indicati-on and methods for their dimensioning and tolerancing.

For the purposes of this International Standard, the term “cone” relates to right-angle circular cones only.

NOTES

1 For simplicity, only truncated cones have been rep- resented in this International Standard. However, this International Standard can be applied to any type of cone within its scope.

2 This International Standard is not intended to prevent the use of other methods of dimensioning and tolerancing.

rate of taper C: Ratio of the difference in the diam- eters of two sections of a cone to the distance be- tween them. It is expressed by the following formula (see also figure 1):

C=U-d= , L

2 tan 4 ( 1

Figure 1

2 Normative references

The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publi- cation, the editions indicated were valid. All stan- dards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of ap- plying the most recent editions of the standards in- dicated below. Members of IEC and IS0 maintain registers of currently valid International Standards.

IS0 1119:1975, Series of conical tapers and taper angles.

IS0 3461-2:1987, Genera/ principles for the creation of graphical symbols - Part 2: Graphical symbols for use in technical product documentation.

4 Graphical symbol for a cone

A cone shall be indicated using the graphical sym- bol illustrated in figure2 positioned on a reference line (see figure7). The orientation of the gi-aphical symbol shall coincide.with that of the cone (see tig- ure 7 and figure 8).

15" L Figure 2

3 Definition

For the purposes of this International Standard, the following definition applies.

For the size and line thickness of the graphical symbol, see IS0 3461-2.

IS 10718 t 1883 1s03040:1880

5 Dimensioning of cones

5.1 Characteristics of cones

In order to define a cone, the characteristics and dimensions shown in table 1 may be used in those combinations most appropriate for the function of the cone.

No more dimensions than are necessary shall specified. However, additional dimensions (for f ample, half the included angle) may be given “auxiliary” or “reference” dimensions in brackc for information.

Typical combinations of cone characteristics and 1 mensions are shown in figure 3, figure 4, figure 5 a figure 6.

Table 1 - Characteristics and dimensions of cones

Characteriatlcs and dimensions

Characterlstlu

Rate of taper

Cone angle

Cone diameter

- at the larger end - at the smaller end

- at the selected cross-section

Length

Cone length

Length including cone length

Length locating a cross-section at which 0, is specified

Letter symbol

C

a

D

d

4

L

L'

J,

r Examples of indication

Preferred method

1:5

If5

35”

Optional method

0,2 : 1

20 %

0.6 rad

Figure 3

2

IS 10718 : 1883 ls03040:1890

Figure 4

C

I t

I

__J_ __J_L

Lx L'

Figure 5

c

Figure 6

5.2 Indication of rate of taper on drawings

The graphical symbol and the rate of taper of a cone NOTE 3 shall be indicated near to the feature, and the refer-

Other methods of tderancing using only di- mensional tolerances do not giveadequate indication with

ence line shall be connecied to the outline of the regard to the shape of the surface.

cone by a leader line as shown in figure7. The ref- erence line shall be drawn parallel to the centre-line of the cone, and the orientation of the graphical symbol shall coincide with that of the cone.

Graphical symbol

Leader line

Reference line

Figure 7 ’

5.3 Standardized series of cones

When the taper to be indicated is one of a stan- dardized series of conical taper (in particular Morse or metric taper), the tapered feature may be desig- nated by specifying the standard series (see IS0 1119) and appropriate number (see figurea).

Morse No.3

A _-_---_--

Figure 6

8 Tolerancing of cones

Cones shall be toleranced (both size and conical surface) in accordance with4he methods given in 6.1 to 6.5.

The letter symbol 1 is used to define the width of the tolerance zone.

3

IS10718:1893 Is03040:1860

6.1 Tolerancing of cone, cone angle specified

Indication on the drawing Interpretation

Figure 9

6.2 Tolerancing of cone, rate of taper specified

Indication on the drawing

4

interpretation

Figure 10

ISlO718:1883 1s03040:1880

.3 Toleranclng zone of cone defining imultaneously the axial location of the cone

indication on the drawing

Figure 11

i.4 Toleranclng of cone separate from the olerance of the axial location of the cone

Indication on the drawing Interpretation

L,+$ sin(F) J

Figure 12

5

IS 10718 : 1883 DO 3046 : 1890

6.5 Tbleranclng of cone related to a datum (simultaneously defining coaxlallty)

Indication on the drawing

* 1

cl 2 ---- Y cl ---- t

Figure 13

Interpretation

--I

axis A

6

Standard Mark

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Bureau of Indian Standards

BIS is a statutory institution established under the Bureau of Indian Stan&r& Act, 1986 to promote harmonious development of the activities of standardization, marking and quality certification of goods and attending to connected matters in the country,

Copyright

BIS has the copyright of all its publications. No part of these publications may be reproduced in any form without the prior permission in writing of BIS. This does not preclude the free use, in the course of implementing the standard, of necessary details, such as symbols and sizes, type or grade designations. Enquiries relating to copyright be addressed to the Director ( Publications ). BIS.

Revision of Indian Standards

Amendments are issued to standards as the need arises on the ~basis of comments. Standards are also reviewed periodically; a standard along with amendments is reaffirmed when such review indicates that no changes are needed; if the review indicates that changes are needed, it is taken up for revision, Users of Indian Standards should ascertain that they are in possession of the latest amendments or edition by referring to the latest issue of ‘BIS Handbook. and ‘Standards Monthly Additions’. Comments on this Indian Standard may be sent to BIS giving the following reference:

Dot : No. LM 02 ( 0205 )

Amend No.

Amendments Issoed Since Pal.$licatIaa

Date of Issue Text Affected

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