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है”ह”ह
IS 2743 (1992): Test chart for surface grinding machineswith horizontal grinding wheel spindle and reciprocatingtable [PGD 3: Machine Tools]
IS 2743 : 1992
IS0 1986 : 1985
( S?l?T g;Ifbm )
Indian Standard
TEST CHART FOR SURFACE GRINDING MACHINES WITH HORIZONTAL GRINDING WHEEL SPINDLE ”
AND RECIPROCATING TABLE
( Second Revision )
UDC 621’924’2 : 620’1 ( 084’3 )
@BlS 1992
BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
October 1992 Price Group 6
Machine Tool Basics and Modular Units Sectional Committee, PE 03
NATIONAL FOREWORD
This Indian Standard ( Second Revision ) which is identical with IS0 1986 : 1985 ‘Acceptance conditions for surface grinding machines with horizontal grinding wheel spindle and recipro- cating table - Testing of accuracy’ issued by the International Organization for Standardization ( IS0 ) was adopted by the Bureau of Indian Standards on the recommendations of the Machine Tool Basics and Modular Units Sectional Committee ( PE 03 ) and approval of the Production Engineering Division Council.
This standard was first issued in 1964 based on DIN 8632 : 1942. The first revision was done to align the requirements laid down in IS0 recommendation ISO/R 1986 : 1971. Consequent upon the publication of IS0 1986 : 1985, this standard has been revised by adopting IS0 1986 : 1985, to bring it in line with IS0 standard.
Certain conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following:
a) Comma ( , ) has been used as a decimal marker in the International Standard while in Indian Standards the current practice is to use point ( . ) as a decimal marker.
b) Wherever the words ‘International Standard’ appear, referring to this standard, they should be read as ‘Indian Standard’.
c) Some dimensions appear in ‘inches’ in the International Standard besides in metric system while in Indian Standards, the current practice is to give metric values only.
In this adopted standard, reference appears to ISO/R 230 ( since revised as IS0 230/l : 1986). The Indian Standard IS 2063 1988 ‘Acceptance code for machine tools : Geometric accuracy of machines operating under no load or finishing conditions ( first revision )’ which is identical with IS0 230/l : 1986 is to be substituted in its place.
IS 2743 : 1992
IS0 1986 : 1985
Indian Standard
TEST CHART FOR SURFACE GRINDING MACHINES WITH HORIZONTAL GRINDING WHEEL SPINDLE
AND RECIPROCATING TABLE
( Second Revision )
1 Scope and field of application
This International Standard describes, with reference to
ISO/R 230, both geometrical and practical tests on general
purpose and normal accuracy surface grinding machines with
reciprocating table and horizontal grinding wheel spindle, and
the corresponding permissible deviations which apply.
It is not applicable to surface grinding machines with fixed or
rotating tables or to machines having longitudinal traverse of
the wheelhead. 1)
This International Standard deals only with the verification of
accuracy of the machine. It does not apply to the testing of the
running of the machine (vibrations, abnormal noises, stick-slip
motion of components, etc.), nor to machine characteristics
(speeds, feeds, etc.) which should generally be checked before
testing accuracy.
2 Preliminary remarks
2.1 In this International Standard, all dimensions and per-
missible deviations are expressed in millimetres and in inches.
2.2 To apply this International Standard, reference should be
made to ISO/R 230, especially for the installation of the
machine before testing, warming up of spindles and other
moving parts, description of measuring methods and rec-
ommended accuracy of testing equipment.
2.3 The sequence in which the geometrical tests are given is
related to the sub-assemblies of the machine and this in no way
defines the practical order of testing. In order to make the
mounting of instruments or gauging easier, tests may be
applied in any order.
2.4 When inspecting a machine, it is not always necessary to
carry out all the tests described in this International Standard. It
is up to the user to choose, in agreement with the manu-
facturer, those tests relating to the properties which are of
interest to him, but these tests are to be clearly stated when
ordering a machine.
2.5 Practical tests should be made with finishing cuts.
2.6 When the tolerance is established for a measuring range
different from that given in this International Standard (see
2.311 in ISO/R 230 or when determining permissible deviation
by calculation), it should be taken into consideration that the
minimum value of tolerance is 0,001 mm (0.000 04 in) for
geometrical tests and practical tests.
3 Reference
ISO/R 230, Machine tool test code.
11 For reasons of stmplicity, the diagrams in this international Standard illustrate only one type of machine
1
IS 2743 : 1992
IS0 1988 : 1985
4 Acceptance conditions and permissible deviations
4.1 Geometrical tests
No. Diagram Object
-
___--_.
Verification of levelling of slideways :
a) Longitudinal verification :
Straightness of slideways in the vertica
plane.
GO
I
b) Transverse verification :
Slideways should be in the same plane.
--
Verification of straightness of slideways in a
horizontal plane.
G, _____________-.___ ____ _ ~~
Alternatives
(These alternatives are for small machines
where the table is not to be dismantled.)
Verification of the straightness of thcl
longitudinal movement of the table.
I- -------_ ---_----- ______ --___ I I
2
IS 2743 : 1992 IS0 1986 : 1985
-
-
-
Permissible deviation
mm
a) 0,02 up to 1000
For each 1000 mm in
crease in length, add
0,015
Maximum permissible
deviation :
0,05
a) Variation of level :
0.0211 000
0.02 up to i ooo
For each 1000 mm increase in
length, add
0.02
Maximum permissible devi-
ation :
0.05
Local tolerance :
0,Ol
over any measuring length
of 300
C.
i-
0.01 up to 1000
For each 1000 mm increas? in
length. add
0,Ol
Maximum permissible devi-
ation :
0,025
in
0.000 8 up to 40
For each 40 in increase in length, add
0.000 6
Maximum permissible deviation :
0.002
Variation of level :
0.000 8140
0.000 8 up to 40
For each 40 in increase in
length, add
0.000 8
Maximum permissibie devi-
ation :
0.002
Local tolerance :
0.000 4
over any measuring length
of 12
0.000 4 up to 40
For each 40 in increase in
length, add
0 000 4
Maximum permissible devi-
ation :
0 001
--------t--- ---------
Measuring
instruments
Precision levels,
optical or other
methods
Straightedge, support and dial
gauge, or taut
wire and micro-
XODe
Observations and references
in test code ISO/R 230
a) Clauses 3.11, 3.21, 5.212.21 and
5.212.22
Measurements should be made at a
number of positions equally spaced along
the length of the slideways.
For machines standing on three support points or having a table travel less than
1 500 mm (60 in) the table need not be
removed. In this case the level should be
placed successively on the exposed por-
tions of the slideways and on the table. The
table should be in its central position.
6) Clause 5.412.7
A level should be placed transversely on
the slideways, and measurements should
be taken at a number of positions equally
spaced along the length of the slideway.
The variation of level measured at any pos-
ition should not exceed the permissible
deviation. -
Clause 5.232.1
The dial gauge should be fixed on a sup-
port A of a suitable form such that it can
slide in the slideways with the stylus
touching a straightedge laid parallel to the
slidewavs.
Clauses 5.232 1 or 5.212.3 - 5.232.2
In alternative 11, the dial gauge support
should be placed on a fixed part of the
machine, the stylus touching a straight-
edge laid parallel to the general direction of
the longitudinal movement of the table.
3
IS 2743 : 1992 IS0 1988 : 1985
No.
G2
-
G3
-
Diagram
L
Alternative
r
4
Object
Verification of flatness of the table surface.
Verification of parallelism of the table surface
a) to its longitudinal movement;
6) to its transverse movement or to tt
transverse movement of the wheelhead.
IS 2743:1992
IS0 1986:1985
Permissible deviation Measuring Observations and references
mm in instruments in test code ISO/R 230
0.01 up to 1 ooo o.Cw 4 up to 40
For each loo0 mm increase in For each 40 in increase in length, add length, add
0.01 0.000 4
Maximum permissible devi- Maximum permissible devi- ation : ation :
Straightedge Clauses 5.322 and 5.323 and slip gauges
0.04 0.0016 or precision Table not locked and positioned at thl
level centre of travel.
Local tolerance : Local tolerance :
0,005 0.000 2
over any measuring length over any measuring length
of 300 of 12
-
l
a) L’
0,010 x __ 1000 a) o.ooo4 x &
Clause 5.422.21
Maximum permissible Maximum permissible deviation : deviation :
1) Checking by direct contact with the
table.
0,030 0.0012 If the spindle can be locked, the dia
Local tolerance : Local tolerance : gauge may be mounted on it. If the
spindle cannot be locked, the dial gauge 0,003 0.000 12
Dial gauge should be placed on a fixed part of tht machine.
over any measuring length over any measuring length of 300 of 12 The stylus to be placed approximately ir
L’ * the wheel spindle axis.
6) 0,007 x ___ 1000
bl o.ooo3 x & l L = measuring length
(this permissible deviation (this permissible deviation
should be > 0,001) should be > 0.000 04)
~---
f
0,007 x L l
a) 1000
a) o.OOO3x&O
Maximum permissible 2) Checking with a straightedge.
Maximum permissible deviation : deviation : It is unnecessary to follow the test code
Dial gauge and ISO/R 230. The checking should be 0,020 0.000 8 precision made on a straightedge laid parallel to
.
0,007 x $&j
+ straightedge the table surface and placed in the di-
b) 6) 0.0003 x $ rection of the movement concerned.
(this permissible deviation (this permissible deviation l L = measuring length
should be > 0,001) should be > 0.000 04)
-.
5
IS 2743 : 1992 IS0 1988 : 1985
Nc
-
Gl
-
S!
-
$6
-
Diagram Object
Verification of parallelism of the median o
reference T slot to the longitudinal movemen
of the table.
Verification of squareness of the longitudinal
movement of the table to its transverse move-
ment or to the wheelhead movement.
Verification of squareness and straightness of
he vertical movement of the wheelhead to the
able surface in a transverse vertical plane.
-
6
IS 2743 : 1992
IS0 1986 : 1985
-
-
-
Permissible deviation Measuring Observations and references ..._..,,I,._l, l _.... ,u,;...lly ‘_ ._ instruments
in test code ISO/R 230
-or each 1000 mm increase in For each 40 in increase in ength, add length, add
0,Ol 0.000 4 Clauses 5.422 1 and 5 422.21
Maximum permissible devi- Maximum permissible devi-
ation : ation : Dial gauge If the spindle can be locked, the dial gauge
may be mounted on it. If the spindle cannot
0,05 0.002 be locked, the dial gauge should be placed
on a fixed part of the machrne.
Local tolerance : Local tolerance :
0,008 o.ooo 3
over any measuring length over any measuring length
of 300 of 12
Clause 5 522.4
0,03/30@ 0.0012/12
a) Place the straightedge parallel to the longitudinal movement of the table and
Straightedge, then place the table in its central pos-
square and dial ition.
gauge 0) Place the square in contact with the
straightedge.
cl Check the transverse movement of the
table or the wheelhead.
Clause 5.522.2
0,04/300 0.0016/12 Dial gauge
and square
Clamp the wheelhead if possible when
taking measurements.
If the spindle can be locked, the dial gauge
can be mounted on it. If the spindle cannot
be locked, the dial gauge should be placed
on a fixed part of the wheelhead.
IS 2743 : 1992
is0 1988 : 1985
No. Diagram Object
G7 Measurement of run-out of the wheel spindle
nose.
G8 Measurement of periodic axial slip of the
wheel spindle.
G9 Verification of parallelism of the axis of the
wheel spindle to the table surface.
Verification of squareness of the axis of the wheel spindle to the median or reference T slot
of the table.
8
IS 2743 : 1992 IS0 1988 : 1985
-
-
-
-
0,Ol
0.01
0,025/300
0.000 4
0.000 4
Permissible deviation Measuring Observations and references
mm in instruments in test code GO/R 230
Dial gauge
Clauses 5.612.1 and 5.612.2
The stylus of the dial gauge should be set
normal to the surface which is to be checked. Checking should be carried out at
each extremity of the taper. This is not
stated in the test code ISO/R 230.
Dial gauge
Clauses 5.622.1 and 5.622.2
A force F, specified by the manufacturer of
the machine, should be exerted co-axially
with the spindle.
The line of action of the stylus of the dial
gauge should be co-axial with the spindle.
O.OOl/ 12” Dial gauge
and square
Clauses 5.512.1 and 5.512.42
Table in central position.
Wheelhead clamped when taking measure-
ments.
Distance between the two points touched
Clauses 5.512.1 and 5.512.42
Table in central position.
0,015/300* 0.000 6/12* Dial gauge and square Wheelhead clamped when taking measure-
ments.
l Distance between the two points touched.
9
c
IS 2743 : 1992 IS0 1986 : 1985
4.2 Practical tests
Diagram and sizes of test pieces
Grinding of five cylindrical or ret
The surface of the test blocks in Number of test pieces should be five. contact with the table should be
Material from which the test pieces should be manufactured ground before carrying out the test. After grinding test
Pl pieces should have
may be either : The test pieces should be positioned the same
as follows : a) cast iron;
thicknesses.
b) steel. - one at the central point of the
table;
The test pieces should be of equal hardness and should be
suitably fixed to the table. - one at each of the four corners of
the table.
The dimensions of the functional surfaces of the test pieces should be as small as possible, for instance : 50 mm x 50 mm (2 in x 2 in) square or 50 mm (2 in)
diameter.
L w ----- L-3 --_----
. --b--a-- i-
I ----_ r--- ---1 This practical test should be carried L “‘, ___-a
out with combination of the -----_- -----_
I longitudinal and transverse move- -------- __-----_ ments which are particular to every
- machine.
Grinding of a rectangular block.
P2
The test piece should be clamped to
the table by mechanical means.
The rigidity of the test piece must be For any given
such as to prevent the clamping position of the test
causing any deformation of the test piece on the table,
piece. the thickness of the
test piece should be
I> 3e
For the first test, the test piece constant.
should be fixed at the central pos-
ition on the table.
For any additional tests, the test
c = width of grinding wheel pieces may be fixed at any other
I = width of test piece position on the table.
f. = length of test piece The reference surface in contact C = length of table travel with the table should be ground
Material from which the test pieces should be manufactured before carrying out the test.
may be either :
a) cast iron;
b) steel.
IS 2743 : 1992 IS0 1988 : 1985
mm
Permissible deviation
Distance between the test blocks < 1000 :
0,005 for 300
(Distance between the test blocks < 300 :
a permissible deviation proportional to the dis- tance should be taken which does not fall below 0,001)
Distance between the test blocks > 1 Ooo :
add 0,Ol to the tolerance for each 1000 mm in- crease in length.
Maximum permissible deviation :
05
0.005
3r a distance of 300 between ieasurements
/laximum permissible devi- tion :
0,03
in
Distance between the test blocks < 40 :
O.ooO 2 for 12
(Distance between the test blocks < 12 :
a permissible deviation proportional to the .dis- tance should be taken which does not fall below 0.000 4)
Distance between the test blocks > 40 :
add 0.000 4 to the tolerance for each 40 in increase in length.
Maximum permissible deviation :
0.002
0.000 2
for a distance of 12 between measurements
Maximum permissible devi-
ation :
0.0012
r Measuring instruments
Precision dial
gauge
Precision dial
gauge
Observations and references in test code 60/R 230
Clauses 3.1, 3.22, 4.1 and 4.2
Clauses 3.1, 3.22, 4.1 and 4.2
11’
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Standard Mark
‘The use of the Standard Mark is governed by the provisions of the Bureau 01 Indian &ma&& Act, 1986 and the Rules and Regulations made thereunder. The Standard Mark on products covered by an Indian Standard conveys the assurance that they have been produced to comply with the requirements of that standard under a well defined system of inspection, testing and quality control which is devised and supervised by BIS and operated by the producer. Standard marked products are also continuously checked by BIS for conformity to that standard as a further safeguard. Details of conditions under which a licence for the use of the Standard Mark may be granted to manufacturers or producers may be obtained from the Bureau of Indian Standards.
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BIS is a statutory institution established under the Bureau of Indian Standards 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. Euquiries relating to copyright be addressed to the Director ( Publications ), BIS.
Revision of Indian Standards
Indian Standards are reviewed periodically and revised, when necessary and amendments, if any, are issued from time to time. Users of Indian Standards should ascertain that they are in possession of the latest amendments or edition. sent to BIS giving the following reference:
Comments on this Indian Standard may be
Dot : No. PE 03 ( 5126 )
Amendments Issued Since Publication
Amend No. Date of Issue Text Affected
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