ISO 1708:1983

international Standard @ I7O8
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION.ME)YHA~~HAR OPrAHHlAUHR Il0 CTAHAAPTH3ALIHH.ORGANISATlON INTERNATIONALE DE NORMALISATION
Acceptance conditions for general purpose parallel
lathes - Testing of the accuracy
Conditions de réception des tours parallèles d'usage général - Contrôle de la précision
Third edition - 1983-06-15
- w UDC 621.941.22-187 Ref. No. IS0 1708-1983 (E)
-
'
Descriptors : machine tools, lathes, tests, testing conditions, accuracy.
9
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v, Price based on 12 pages

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Foreword
IS0 (the International Organization for Standardization) is a worldwide federation of
national standards bodies (IS0 member bodies). The work of developing International
Standards is carried out through IS0 technical committees. Every member body
interested in a subject for which a technical committee has been authorized has the
right to be represented on that committee. International organizations, governmental
and non-governmental, in liaison with ISO, also take part in the work.
Draft International Standards adopted by the technical committees are circulated to
the member bodies for approval before their acceptance as International Standards by
the IS0 Council.
International Standard IS0 1708 was developed by Technical Committee ISO/TC 3,
Machine tools.
This third edition was submitted directly to the IS0 Council, in accordance with clause
6.11.2 of part 1 of the Directives for the technical work of EO. It cancels and replaces
the second edition (i.e. IS0 1708-19791, which had been approved by the member
bodies of the.following countries :
Australia
India South Africa, Rep. of
Austria
Israel Spain
Belgium
Italy Sweden
Brazil
Japan Switzerland
Chile Thailand
Korea, Rep. of
Czechoslovakia
Netherlands Turkey
France New Zealand United Kingdom .
Germany, F.R. Poland USA
Greece Portugal
Hungary Romania
No member body had expressed disapproval of the document.
0 International Organization for Standardization, 1983 O
Printed in Switzerland

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IS0 1708-1983 (E)
INTERNATIONAL STANDARD
Acceptance conditions for general purpose parallel
lathes - Testing of the accuracy
3.3 The sequence in which the geometrical tests are given is
1 Scope and field of application
related to the sub-assemblies of the machine, and this in no
This International Standard describes, with reference to
way defines the practical order of testing. in order to make the
ISO/R 230, both geometrical and practical tests on general pur-
mounting of instruments or gauging easier, tests may be
pose parallel lathes, and gives the corresponding permissible
applied in any order.
deviations which apply.
It deals only with the verification of accuracy of the machine. It
does not apply to the testing of the running of the machine
3.4 When inspecting a machine, it is not always necessary to
(vibrations, abnormal noises, stick-slip motion of components,
carry our all the tests given in this International Standard. It is
etc.), or to characteristics (speeds, feeds, etc.,) which should
up totthe user to choose, in agreement with the manufacturer,
generally be checked before testing accuracy.
those relating to the properties which are of interest to him, but
the adreed tests shall be clearly stated when ordering a
machine.
2 Reference
ISO/R 230, Machine tool test code.
-
3.5 Practical tests should be made with finishing cuts
for instance, depth = 0,l mm (0.004 in); feed = 0,l mm
3 Preliminary remarks
(0.004 in) per revolution - and not with roughing cuts, which
are liable to generate appreciable cutting forces.
3.1 In this International Standard, all the dimensions are
expressed in millimetres and in inches.
3.6 When establishing the tolerance for a measuring range
3.2 To apply this International Standard, reference shall be
made to ISO/R 230, especially for installation of the machine different from that indicated in this International Standard (see
clause 2.31 1 in ISO/R 230) it should be taken into consideration
before testing, warming up of spindles and other moving parts,
that the minimum value of tolerance is 0,005 mm (0.0002 in) for
description of measuring methods and recommended accuracy
of testing equipment. precision lathes and 0,010 mm (O.OOO4 in) for other lathes.
1

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4 Acceptance conditions and permissible deviations
4.1 Geometrical tests
-
Precision lathes
Diagram
No. Object
rnm
in
1, < 500 and DC< 150( Da < 20 and DC < 60
-
DC < 500
DC < 20
0,Ol (convex) 0.0004 (convex)
~~
500 20 < DC < 40
0,015 (convex) O.ooo6 (convex)
Local tolerance ** : Local tolerance ** :
A - Bed
0,005 0.0002
Verification of levelling of slide-
for any length of 250 for any length of 10
ways
a) Longitudinal verification:
1OoO < DC < 1500 40 Straightness of slideways in
0,02 (convex) O.ooo8 (convex)
the vertical plane.
G1
Local tolerance ** : Local tolerance ** :
0,005 0.0002
for any length of 250
for any length of 10
b)
61 Transverse verification: 6) Variation of level : 6) Variation of level :
Slideways should be in the
0.03/1000 0.0012/40
same plane.
-
DC < 500
DC < 20
~
1
0.01
O.OOO4
500 B - Carriage
0,015
0.O006 ~
Checking of straightness of
G2 carriage movement in a horizon-
tal plane or, possibly, in a plane
defined by the axis of the centres
1000 < DC < 1500
40 and the tool point.
i
0,02
O.OOO8 1
b)
deviation
4
-
' DC = distance between centres.
Da = maximum permissible diameter above the bed.
** See clause 5

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IS0 1708-1983 (E)
Permissible deviation*
Other lathes
Observations and references
Measuring
instruments to the test code ISO/R 230
rnrn
in
Da < 800 800 < Da < 1600 Da < 32 I 32 c Da < 64
I
DC < 20
0.0004 (convex) I 0.0006 (convex)
I
20 < DC < 40
0.0008 (convex) I 0.0012 (convex)
Local tolerance ** :
0.0003 I 0.0O04
Precision
for any Ielgth of 10
levels, optical
or other
methods
DC > 40 a) Clauses 3.11, 3.21, 5.212.21 and 5.212.22
For each 40 increase in distance between
Make the measurements at a number of
centres beyond 40, add to the corre-
positions equally spaced along the length of
sponding preceding tolerance :
the bed.
O.OOO4 I o.ooo8
The levels may be placed on the transverse
slide.
Local tolerance ** :
When the slideways are not horizontal, use a
O.ooo6 I 0.0O08
special straightedge as mentioned in
for any length of 20
figure 12 of clause 5.212.21 (2O).
I I
b) Variation of level : b) Variation of ievei : b) Clause 5.412.7
0,04/1000 0.0016/40
Place a level transversely on the slideways
and take measurements at a number of posi-
I
Precision tions equally spaced along the length of the
levels slideways.
The variation of level measured at any posi-
tion shall not exceed the permissible devia-
tion.
DC < 500 DC < 20 I)t‘For DC
a) Clause 5.232.3a) or 5.232.1
< 1500mm
0,015 I 0.02 Touch the front generatrix of the mandrel
0.0O06 1 0.0O08
(60 in)
(instead of the mandrel, a straightedge with
dial gauge
parallel faces may be used).
and
I
mandrel
Length of mandrel between centres shall be
I
between
as nearly as possible equal to the value
500 < DC < loo0 20 < DC < 40
centres of
I
of DC.
straight-
0,025 0.0010
edge
0‘02 I O.- I
I I
DC> 1000 DC > 40 b) Whatever
b) Clauses 5.212.3 and 5.232.3b)
the value of
For each 1000 increase in distance be-
For each 40 increase in distance between
The deviation of straightness of carriage
OC, taut
tween centres beyond 1000, add to the centres beyond 40, add to the corre-
movement shall, other than in exceptional
wire and
corresponding preceding tolerance : sponding preceding tolerance :
cases, be concave relative to the axis of the
microscope
centres.
0,005 0.0002 or optical
methods
Maximum permissible deviation : Maximum permissible deviation :
0.03 I 0.05 0.0012 I 0.0020
3-4

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Precision lathes
No. Diagram Object
in
1, < 500 and DC < 150l Da < 20 and DC < 60
Checking of parallelism of tail-
stock to carriage movements:
t
a) in the horizontal plane; a) 0.02 a) o.Oo08
Local tolerance : Local tolerance :
0.01 O.ooo4
- il
for any length of 500 for any length of 20
i
G3
6) in the vertical plane. 6) 0,03 6) 0.0012
= constant
Local tolerance : Local tolerance :
+
0,02
O.Oo08
for any length of 500 for any length of 20
C - Headstock spindle
6)
F** a) 0.005
a) Measurement of periodic axial a) 0.0002
slip.
G4
b) Measurement of camming of 6) 0,Ol 6) o.ooo4
the face plate resting surface.
including periodic
including periodic
axial slip axial slip
-
1
Measurement of run-out of
65
0,007 0.0003
spindle nose centring sleeve
-
Measurement of run-out of axis
of centre :
a) at the spindle nose of the a) 0,005
housing;
a) . , b)
6) at a distance from the spindle 6) 0,015 6) O.ooo6
Da
for a measuring length for a measuring length
nose equal to -or not more
2
of 300
of 12
G6
than 300 mm (12 inill.
0.01
O.OOO4
for a measuring length for a measuring length
of 200 of 8
0,005 0.0002
for a measuring length for a measuring length ~
of 100 of 4
-
DC = distance between centres.
Da = maximum permissible diameter above the bed.
**
F = constant pressure on spindle to eliminate axial bearing end play. 5

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IS0 1708-1983 (E)
Permissible deviation
Other lathes
Measuring
Observations and references
instruments to the test code ISO/R 230
in
Da < 800 800 DC< 1500 DC < 60
a) and b) 0.03 I ai and b) 0,04 a) and b) 0.0012 a) and b) 0.0016
Local tolerance : Local tolerance ** :
Clause 5.422.5
0,02 O.ooo8
With the tailstock as close as possible to the
for any length of 500 for any length of 20
carriage take the readings when both are
Dial gauge
I I
moved together; keep the tailstock sleeve
DC> 1500
DC > 60
locked so that the dial gauge fixed on the
ai and 6) 0.04 a) and b) 0.0016
carriage always touches the same point.
Local tolerance : Local tolerance :
0,03 0.0012
for any length of 500 for any length of 20
I
Clauses 5.62, 5.621.2, 5.622.2 and 5.632
For the position of the dial gauge, see figures
Dial gauge
ai 0.01 a) 0,015 a) o.oO04 ai O.ooo6
59 to 64 and 67 of clauses 5.62, 5.622 and
and, possibly,
5.632.
a special
device The value of force F to be applied for the
b) 0,02 b) 0,02 b) o.OOO8 b) o.OO08
tests a) and b) shall be specified by the
including pe dic axial slip
manufacturer.
Clauses 5.612.2 and 5.621.2
The value of force F to be applied shall be
specified by the manufacturer.
0,Ol O.oO04 0.0oO6
0,015 Dial gauge
In the case of a tapered spindle nose, fix the
dial gauge perpendicular to the generating
line of the taper.
a) O.OOO6
a) 0.01 a) 0,015 a) O.GûO4
6) 0.02 6) 0.05 6) o.OO08 6) 0.0020
for a measuring
for a measuring for a measuring for a measuring
Dial gauge
length of 300 length of 500 length of 12 length of 20
and test
Clause 5.612.3
mandre
...