The standard applies to calipers intended for measuring external and internal dimensions up to 2000 mm, as well as special-purpose calipers for measuring grooves on external and internal surfaces, grooves, distances between the axes of small diameter holes and pipe walls.

Designation:	GOST 166-89*
Russian name:	Calipers. Specifications
Status:	current
Replaces:	GOST 166-80
Date of text update:	01.10.2008
Date added to the database:	01.02.2009
Effective date:	01.01.1991
Designed by:	Ministry of Machine Tool and Tool Industry of the USSR
Approved:	State Standard of the USSR (10/30/1989)
Published:	Publishing house of standards No. 1989 IPC Standards Publishing House No. 1997

VERNIER CALIPS

TECHNICAL CONDITIONS

GOST 166-89

(STSEV 704-77¸ ST SEV 707-77; ST SEV1309-78, ISO 3599-76)

USSR STATE COMMITTEE FOR MANAGEMENT
PRODUCT QUALITY AND STANDARDS

Moscow

STATE STANDARD OF THE USSR UNION

Validity from 01.01.91

until 01/01/96

Failure to comply with the standard will be prosecuted by law

This standard applies to calipers designed for measuring external and internal dimensions up to 2000 mm, as well as special-purpose calipers for measuring grooves on external and internal surfaces, grooves, distances between the axes of small diameter holes and pipe walls.

The requirements of this standard are mandatory.

(Changed edition, Amendment No. 2).

1 . TYPES. MAIN PARAMETERS AND DIMENSIONS

Vernier reading value

Dividing value of the circular scale of the reading device

Discrete step of digital readout device

0 - 125

0 - 135

0 - 150

0,02; 0,05; 0,1

0 - 160

0 - 200

0 - 250

0,05; 0,1

0,01

0 - 300

0 - 400

0 - 500

250 - 630

250 - 800

320 - 1000

500 - 1250

500 - 1600

800 - 2000

Notes:

l

l 1

l 2

l 3

no less

no more

no less

0 - 125

0 - 135

0 - 150

0 - 160

0 - 200

0 - 250

0 - 300

0 - 400

0 - 500

250 - 630

250 - 800

320 - 1000

500 - 1250

500 - 1600

800 - 2000

(Changed edition. Amendment No. 1).

Limit of permissible error of calipers (± )

at the vernier reading value

with the division value of the circular scale of the reading device

with discrete step of digital readout device

0,05

0.1 for accuracy class

0,02

0,05

0.1 for accuracy class

0,01

Up to 100

0,05

St. 100 to 200

0,05

0,10

0,03

0,04

0,05

0,08

0,03

» 200 » 300

0,04

» 300 » 400

0,10

0,04

» 400 » 600

0,10

0,05

» 600 » 800

0,06

» 800 » 1000

0,07

» 1000 » 1100

0,15

» 1100 » 1200

0,16

» 1200 » 1300

0,17

» 1300 » 1400

0,18

» 1400 » 1500

0,19

» 1500 » 2000

0,20

(Changed edition).

Notes:

Upper limit of measurement, mm

Type of processing or coating of steel calipers

highly alloyed

instrumental and structural

Rod (except scale and end), jaws, caliper frame, microfeed frame, excluding measuring and adjacent surfaces

Until 2000

Chrome plating

Bar and vernier scale

Up to 630

Matte coating

Matt chrome plating

Chrome plating

St. 630 to 2000

Chrome plating

Note: It is allowed to use other metallic and non-metallic coatings in accordance with GOST 9.303 and GOST 9.032, whose protective and decorative properties are not inferior to those indicated in the table. .

It is allowed for calipers with an upper measurement limit of more than 1000 mm not to be chromed.

(Changed edition, Amendment No. 1).

2.18 . Calipers must be demagnetized.

2.19 - 2.24 (Excluded. Changes No. 1, 2).

2.25 .Completeness

2.25.1 . Each caliper must be accompanied by operating documentation for GOST 2.601.

Calipers ШЦ, ШЦК, ШЦЦ produced by YUUIZ "CALIBR" are included in State Register measuring instruments reg. No. 73659-18 in accordance with the order of the Federal Agency for Technical Regulation and Metrology No. 2769 dated December 27, 2018 “On approval of types of measuring instruments.”

ShTs calipers with vernier reading GOST 166-89, TU 26.51.33-001-04567838-2018

Type ШЦ-I - with double-sided arrangement of jaws, for measuring external and internal dimensions and for marking. ShTs-I calipers are equipped with a depth gauge for measuring depths and ledges.

Type ШЦ-II - with double-sided arrangement of jaws, for measuring external and internal dimensions and for marking.

Type ШЦ-III - with one-sided arrangement of jaws, for measuring external and internal dimensions.

Designation of type 2 calipers with a measurement range of 0-250, division price 0.05 when ordering: ШЦ-II-250-0.05

Specifications:

Vernier caliper modification		Reference value vernier, mm
ШЦ-I-125	from 0 to 125	0,02; 0,05; 0,1	-
ШЦ-I-135	from 0 to 135	0,02; 0,05; 0,1	-
ШЦ-I-150	from 0 to 150	0,02; 0,05; 0,1	-
ШЦ-I-160	from 0 to 160	0,02; 0,05; 0,1	-
ШЦ-I-200	from 0 to 200	0,02; 0,05; 0,1	-
ШЦ-I-250	from 0 to 250	0,02; 0,05; 0,1	-
ШЦ-I-300	from 0 to 300	0,02; 0,05; 0,1	-
ШЦ-II-160	from 0 to 160	0,02; 0,05; 0,1	10
ШЦ-II-200	from 0 to 200	0,02; 0,05; 0,1	10
ШЦ-II-250	from 0 to 250	0,02; 0,05; 0,1	10
ШЦ-II-300	from 0 to 300	0,02; 0,05; 0,1	10
ШЦ-II-400	from 0 to 400	0,02; 0,05; 0,1	10; 20
ШЦ-II-500	from 0 to 500	0,02; 0,05; 0,1	10; 20
ШЦ-II-600	from 0 to 600	0,02; 0,05; 0,1	10; 20; 30
ШЦ-II-800	from 0 to 800	0,02; 0,05; 0,1	10; 20; 30
ШЦ-II-1000	from 0 to 1000	0,02; 0,05; 0,1	10; 20; 30
ШЦ-II-1250	from 0 to 1250	0,02; 0,05; 0,1	20; 30
ШЦ-II-1500	from 0 to 1500	0,02; 0,05; 0,1	20; 30
ШЦ-II-1600	from 0 to 1600	0,02; 0,05; 0,1	20; 30
ШЦ-II-2000	from 0 to 2000	0,02; 0,05; 0,1	20; 30
ШЦ-II-2500	from 0 to 2500	0,02; 0,05; 0,1	20; 30
ШЦ-II-3000	from 0 to 3000	0,02; 0,05; 0,1	20; 30
ШЦ-II-3500	from 0 to 3500	0,02; 0,05; 0,1	20; 30; 40
ШЦ-II-4000	from 0 to 4000	0,02; 0,05; 0,1	20; 30; 40
ШЦ-II-5000	from 0 to 5000	0,02; 0,05; 0,1	20; 30; 40
ШЦ-II-630(250)	from 250 to 630	0,02; 0,05; 0,1	10; 20
ШЦ-II-800(250)	from 250 to 800	0,02; 0,05; 0,1	10; 20
ШЦ-II-1000(320)	from 320 to 1000	0,02; 0,05; 0,1	10; 20; 30
ШЦ-II-1250(500)	from 500 to 1250	0,02; 0,05; 0,1	10; 20; 30
ШЦ-II-1600(500)	from 500 to 1600	0,02; 0,05; 0,1	10; 20; 30
ШЦ-II-2000(800)	from 800 to 2000	0,02; 0,05; 0,1	10; 20; 30
ШЦ-III-160	from 0 to 160	0,02; 0,05; 0,1	10
ШЦ-III-200	from 0 to 200	0,02; 0,05; 0,1	10
ШЦ-III-250	from 0 to 250	0,02; 0,05; 0,1	10
ШЦ-III-300	from 0 to 300	0,02; 0,05; 0,1	10
ШЦ-III-400	from 0 to 400	0,02; 0,05; 0,1	10; 20
ШЦ-III-500	from 0 to 500	0,02; 0,05; 0,1	10; 20
ШЦ-III-600	from 0 to 600	0,02; 0,05; 0,1	10; 20; 30
ШЦ-III-800	from 0 to 800	0,02; 0,05; 0,1	10; 20; 30
ШЦ-III-1000	from 0 to 1000	0,02; 0,05; 0,1	10; 20; 30
ШЦ-III-1250	from 0 to 1250	0,02; 0,05; 0,1	20; 30
ШЦ-III-1500	from 0 to 1500	0,02; 0,05; 0,1	20; 30
ШЦ-III-1600	from 0 to 1600	0,02; 0,05; 0,1	20; 30
ШЦ-III-2000	from 0 to 2000	0,02; 0,05; 0,1	20; 30
ШЦ-III-2500	from 0 to 2500	0,02; 0,05; 0,1	20; 30
ШЦ-III-3000	from 0 to 3000	0,02; 0,05; 0,1	20; 30
ШЦ-III-3500	from 0 to 3500	0,02; 0,05; 0,1	20; 30; 40
ШЦ-III-4000	from 0 to 4000	0,02; 0,05; 0,1	20; 30; 40
ШЦ-III-5000	from 0 to 5000	0,02; 0,05; 0,1	20; 30; 40
ШЦ-III-630(250)	from 250 to 630	0,02; 0,05; 0,1	10; 20
ШЦ-III-800(250)	from 250 to 800	0,02; 0,05; 0,1	10; 20
ШЦ-III-1000(320)	from 320 to 1000	0,02; 0,05; 0,1	10; 20; 30
ШЦ-III-1250(500)	from 500 to 1250	0,02; 0,05; 0,1	10; 20; 30
ШЦ-III-1600(500)	from 500 to 1600	0,02; 0,05; 0,1	10; 20; 30
ШЦ-III-2000(800)	from 800 to 2000	0,02; 0,05; 0,1	10; 20; 30

ShTsK calipers with circular scale GOST 166-89, TU 26.51.33-001-04567838-2018

The ShTsK model caliper with a circular dial indicator is intended for internal and external thickness measurements, as well as for depth measurements. Vernier calipers are used for measurements using the absolute method, which do not require high precision. It is allowed to equip ShTsK calipers with devices or auxiliary measuring surfaces for expansion functionality. External dimensions are measured using the lower jaws. The upper jaws are used to measure internal dimensions. For marking work, upper and lower jaws are used. The length of the jaws is standard.

The indicator scale allows you to adjust the zero setting and control tolerance deviations. It has external jaws for measuring external dimensions and internal jaws for measuring internal ones, as well as a built-in depth gauge. The fixed rod and movable frame are made of hardened steel. The division lines on the bar stand out in contrast against its matte surface. The scale is graduated using a laser. Made from carbon and of stainless steel. Hardness of measuring surfaces of tool and structural steel. The caliper has a scale marked on a rod with divisions and a pointer-type reading device is driven by a gear mechanism. The arrow on the dial counts fractions of a millimeter, i.e. the reading of a caliper consists of reading integer values ​​on the rod scale and fractional values ​​according to the readings dial indicator caliper. Smooth movement of the frame is ensured by a spring located inside the frame.

Specifications:

Vernier caliper modification	Measuring range of external dimensions, mm	Reference value on a circular scale, mm
ShTsK-I-125	from 0 to 125	0,01; 0,02; 0,05; 0,1
ShTsK-I-135	from 0 to 135	0,01; 0,02; 0,05; 0,1
ShTsK-I-150	from 0 to 150	0,01; 0,02; 0,05; 0,1
ShTsK-I-160	from 0 to 160	0,01; 0,02; 0,05; 0,1
ShTsK-I-200	from 0 to 200	0,01; 0,02; 0,05; 0,1
ShTsK-I-250	from 0 to 250	0,01; 0,02; 0,05; 0,1
ShTsK-I-300	from 0 to 300	0,01; 0,02; 0,05; 0,1

ShTsTs caliper with digital reporting device GOST 166-89, TU 26.51.33-001-04567838-2018

The ShTsTs caliper has a digital reading device and is intended for measuring external and internal dimensions.

The parts of ShTsTs calipers are made of corrosion-resistant steel or have a reliable anti-corrosion coating.

Calipers are manufactured in three types:
I - double-sided with depth gauge;
II - double-sided;
III - unilateral.

Features of the ShCC:
- setting the origin in the absolute coordinate system;
- issuance of digital information in direct code (indicating the sign and absolute value);
- pre-zero setting;
- output of measurement results to external devices (via digital interface RS232);
- the ability to measure values ​​in both millimeters and inches.

Designation of the ShTsTs type II vernier caliper with a measurement range from 0 to 400 mm and a reading device discrete step of 0.01 mm: ShTsTs-II-400-0.01 vernier caliper

Specifications:

Vernier caliper modification	Measuring range of external dimensions, mm	Discrete step of digital reading device, mm	Size of jaws moved until they touch cylindrical surfaces, (g) mm
ШЦЦ-I-125	from 0 to 125	0,01	-
ШЦЦ-I-135	from 0 to 135	0,01	-
ШЦЦ-I-150	from 0 to 150	0,01	-
ШЦЦ-I-160	from 0 to 160	0,01	-
ШЦЦ-I-200	from 0 to 200	0,01	-
ШЦЦ-I-250	from 0 to 250	0,01	-
ШЦЦ-I-300	from 0 to 300	0,01	-
ШЦЦ-II-160	from 0 to 160	0,01	10
ШЦЦ-II-200	from 0 to 200	0,01	10
ШЦЦ-II-250	from 0 to 250	0,01	10
ШЦЦ-II-300	from 0 to 300	0,01	10
ШЦЦ-II-400	from 0 to 400	0,01	10; 20
ШЦЦ-II-500	from 0 to 500	0,01	10; 20
ШЦЦ-II-600	from 0 to 600	0,01	10; 20; 30
ШЦЦ-II-800	from 0 to 800	0,01	10; 20; 30
ШЦЦ-II-1000	from 0 to 1000	0,01	10; 20; 30
ШЦЦ-II-1250	from 0 to 1250	0,01	20; 30
ШЦЦ-II-1500	from 0 to 1500	0,01	20; 30
ШЦЦ-II-1600	from 0 to 1600	0,01	20; 30
ШЦЦ-II-2000	from 0 to 2000	0,01	20; 30
ШЦЦ-II-2500	from 0 to 2500	0,01	20; 30
ШЦЦ-II-3000	from 0 to 3000	0,01	20; 30
ШЦЦ-II-3500	from 0 to 3500	0,01	20; 30; 40
ШЦЦ-II-4000	from 0 to 4000	0,01	20; 30; 40
ШЦЦ-II-5000	from 0 to 5000	0,01	20; 30; 40
ШЦЦ-III-160	from 0 to 160	0,01	10
ШЦЦ-III-200	from 0 to 200	0,01	10
ШЦЦ-III-250	from 0 to 250	0,01	10
ШЦЦ-III-300	from 0 to 300	0,01	10
ШЦЦ-III-400	from 0 to 400	0,01	10; 20
ШЦЦ-III-500	from 0 to 500	0,01	10; 20
ШЦЦ-III-600	from 0 to 600	0,01	10; 20; 30
ШЦЦ-III-800	from 0 to 800	0,01	10; 20; 30
ШЦЦ-III-1000	from 0 to 1000	0,01	10; 20; 30
ШЦЦ-III-1250	from 0 to 1250	0,01	20; 30
ШЦЦ-III-1500	from 0 to 1500	0,01	20; 30
ШЦЦ-III-1600	from 0 to 1600	0,01	20; 30
ШЦЦ-III-2000	from 0 to 2000	0,01	20; 30
ШЦЦ-III-2500	from 0 to 2500	0,01	20; 30
ШЦЦ-III-3000	from 0 to 3000	0,01	20; 30
ШЦЦ-III-3500	from 0 to 3500	0,01	20; 30; 40
ШЦЦ-III-4000	from 0 to 4000	0,01	20; 30; 40
ШЦЦ-III-5000	from 0 to 5000	0,01	20; 30; 40

For questions regarding purchasing products, please contact the sales department
by phone

LABORATORY WORK No. 2

MEASUREMENT OF PART DIMENSIONS USING THE ABSOLUTE METHOD

Goal of the work:

Explanation of the concept of an absolute measurement method;

Mastering the selection technique, measuring instrument By
measurement accuracy;

Study of the design of calipers, vernier depth gauges and
micrometer, them metrological characteristics;

Acquiring the skill of using calipers, calipers
depth gauge and micrometer.

The concept of the absolute measurement method

Measurement linear dimensions perform absolute and relative
telny methods.

With the absolute method, the measurement result is read
directly according to the shown measuring instrument. Distinctive feature measuring instruments for absolute measurements is the presence of line measures (linear scales) with which the measured value is compared. The accuracy of measuring instruments for absolute measurements is limited by the manufacturing accuracy of the scales.

The most common measuring instruments for
absolute measurements are caliper tools and micrometers
ical tools.

Device, technical specifications and methodology

measurements with caliper ShTs-II (GOST 166-80)

Vernier calipers are designed to measure internal and
will violate the dimensions by the absolute method.

The design of the ShTs-II caliper (see Fig. 1) is shown in
rice. I. The caliper has two scales: the main one is on
rod 7, additional one is located on vernier 9. Lower pair
sponges are used for external and internal measurements; top pair
pointed jaws are used for marking, as well as for
external measurements.

Vernier reading value, mm - 0.05 or 01
Measurement error, mm + (0.05 or 0.1)

Sequence of change. When measuring with a caliper
the measuring surfaces of the jaws are adjusted to the required size
by contact with the surface being tested, checking at
This ensures that their position is correct (no distortions and normal force when moving), secure frame 3, and read the readings.

When measuring external dimensions, the part is compressed by the internal measuring surfaces of the lower nubs.

When measuring internal dimensions, external measuring
the surfaces of the lower jaws are brought into contact with the walls of the hole. In this case, the thickness of the jaws indicated on them is added to the readings of the caliper.

Verniers . 1. Vernier with a reading value of 0.05 mm. The length of the vernier is 39 mm, it is divided into 20 parts. The vernier division interval is 39:20 = 1.05 mm, i.e. 0.05 mm less than a whole number.” Value C = 0.05 mm and is the vernier reading value.

2. Vernier with a reading value of 0.1 mm. The length of the vernier is
19 mm, it is divided into 10 parts. One division of the vernier is 19:10 » 1.9 mm i.e. 0.1 mm less than a whole number.
C=0.1 mm is the reading value along the vernier.
At zero reading, the vernier stroke is located to the nearest
to the right of the bar stroke at a distance of 9 equal to the reading value
(0.05 or 0.1 mm) multiplied by the serial number of the vernier stroke, not counting zero.

Reading readings on a caliper.

An integer number of millimeters is counted on the rod scale 7 from left to right with a vernier stroke. The fractional value is determined by multiplying the vernier reading value (0.05 or 0.1 mm) by the serial number of the vernier stroke (not counting zero) that exactly matches the bar stroke. Thus, the reading of the measured quantity A on a vernier scale consists of the reading of whole divisions on the scale of the rod and the reading of the fractional part of the division on the vernier scale, i.e.

where A is the measured value;

N is the integer number of divisions of the rod scale, indicated by the zero stroke of the vernier;

K - number of the vernier stroke (not counting zero) exactly matching any stroke of the rod scale;

C – vernier reading value.

Examples of reading on a caliper with verniers having
The reading value of 0.05 or 0.1 mm is shown in Fig. 2.

STATE STANDARD OF THE USSR UNION

VERNIER CALIPS

(ST SEV 704-77¸ ST SEV 707-77; ST SEV 1309-78, ISO 3599-76)

USSR STATE COMMITTEE FOR PRODUCT QUALITY MANAGEMENT AND STANDARDS

STATE STANDARD OF THE USSR UNION

Validity from 01/04/91

until 01/01/96

Failure to comply with the standard is punishable by law

This standard applies to calipers intended for measuring external and internal dimensions up to 2000 mm, as well as calipers special purpose for measuring grooves on external and internal surfaces, grooves, distances between the axes of small diameter holes and pipe walls.

The requirements of this standard are mandatory.

1. TYPES. MAIN PARAMETERS AND DIMENSIONS

1.1. Calipers should be made of the following main types:

I - double-sided with depth gauge (Fig. 1);

T-1-one-sided with a depth gauge with measuring surfaces made of hard alloys (Figure 2);

II-double-sided (Fig. 3);

III - one-sided (feature 4).

Note. It is allowed to equip calipers with devices or auxiliary measuring surfaces to expand functionality (measuring heights, yielding, etc.).

1 – rod; 2 – frame; 3-clamping element; 4 – vernier; 5-working surface of the rod; 6 – depth gauge; 7-jaws with edge measuring surfaces for measuring internal dimensions; 8-jaws with flat measuring surfaces for measuring external dimensions; 9-barbell scale.

Damn 1

1 – rod; 2 – frame; 3-clamping element; 4 – vernier; 5-working surface of the rod; 6 – depth gauge; 7-jaws with flat measuring surfaces for measuring external dimensions; 8-barbell scale.

Damn 2

1 – rod; 2 – frame; 3-clamping element; 4 – vernier; 5-working surface of the rod; 6-device for fine frame adjustment; 7-jaws with edge measuring surfaces for measuring external dimensions; 8-jaws with flat and cylindrical measuring surfaces for measuring external and internal dimensions, respectively; 9-barbell scale.

Damn 3

1 – rod; 2 – frame; 3-clamping element; 4 – vernier; 5-working surface of the rod; 6-jaws with flat measuring surfaces for measuring external dimensions; 7-jaws with cylindrical measuring surfaces for measuring internal dimensions; 8-barbell scale.

Crap. 4

1.2. The caliper should be made with a vernier reading (SD) (Fig. 1-4) or with a circular scale reading (CHIK) (Fig. 5), or with a digital reading device (DRT) (Fig. 6).

1-circular scale of the reading device; 1-digit reading device; 2 –

2 – rod; 3 – frame; 4 – rod scale. barbell; 3 – frame.

Damn 5 Damn 6

Note Figures 1-6 do not define the design of calipers.

1.3. The measurement range, the reading value of the vernier, the division value of the circular scale and the discrete step of the digital reading device of calipers must correspond to those indicated in the table. 1.

Table 1

mm

Measuring range of calipers	Vernier reading value	Dividing value of the circular scale of the reading device	Discrete step of digital readout device

Notes:

1. lower limit measurements for calipers with an upper limit of up to 400mm is set for measuring external dimensions.

2. For T-1 type calipers, the measuring range only applies to external dimensions and depth measurements.

3 The upper limit of measurement for type I and T-1 calipers should be no more than 300mm .

4. It is allowed to produce calipers with separate verniers or scales for measuring external and internal dimensions.

5. It is allowed to manufacture type III calipers with surfaces for measuring external dimensions from a hard alloy (Hard alloy according to GOST 5882)

Example of a symboltype II caliper with a measuring range of 0-250 mm and a vernier reading value of 0.05 mm:

Caliper ShTs- II-250-0.05 GOST 166

The same, caliper type I I with a measuring range of 250-630 mm and a reading value along the vernier of 0.1 mm, accuracy class 1.

Caliper ShTs- II-250-630-0.1-1 GOST 166

The same, type I calipers with a measurement range of 0-150 mm with a dial division of 0.02 mm.

Vernier caliper ShTsK-1-150 –0.02 GOST 166

The same, type I calipers with a measuring range of 0-125 mm with a discrete step of a digital reading device of 0.01 mm:

Vernier caliper ShTsTs-1-125-0.01 GOST 166

1.4. Calipers types II and III , equipped with a device for marking, should be equipped with a device for fine installation of the frame (Fig. 3).

For fine installation of the frame, micrometric feed can be used.

1.5. Sponge flight l And l 2 And l 3 for measuring the outer dimensions and reach of jawsl 1 to measure internal dimensions must correspond to those indicated in the table. 2 (features 1-4).

table 2

mm

measurement range	l		l 1	l 2	l 3
0 -135
0-150
0-160
0-200
0-250
0-300
0-400
0-500
250-630
5 00-1600

(Changed edition. Amendment No. 1, 2).

1.6. Types II and III calipers with jaws for measuring internal dimensions must have a cylindrical measuring surface with a radius of no more than half the total thickness of the jaws (no more g/2 )

For calipers with a measurement limit of up to 400 mm, the size (Fig. 3-4) should not exceed 10 mm, and for calipers with an upper measurement limit of over 400 mm - 20 mm.

1.7. The length of the vernier should be selected from row 9; 19; 39 mm - with a vernier reading value of 0.1 mm, 19; 39 mm - with a vernier reading value of 0.05 mm.

Long vernier strokes may be marked with integers.

1.8. Calipers with a digital reading device must ensure the performance of functions characterizing the degree of automation in accordance with the list (according to the application).

1.9. Digital readout calipers must be powered from the built-in power supply.

Power supply for calipers that have measurement results displayed on external device, must be carried out from the built-in power supply and (or) from the network general purpose via the power supply.

(Changed edition, Amendment No. 2).

1.10. The design of calipers with a digital reading device must ensure correct readings at the highest permissible speed of frame movement of at least 0.5 m/s.

1.11.(Excluded. Amendment No. 2).

2. TECHNICAL REQUIREMENTS

2.1. Calipers should be manufactured in accordance with the requirements of this standard according to working drawings approved in the prescribed manner.

2.2. Vernier calipers with a vernier reading value of 0.1 mm and an upper measurement limit of up to 400 mm and calipers with a circular scale reading with a division value of 0.1 mm should be manufactured in two accuracy classes: 1 and 2.

2.3. Limit of permissible error of calipers at temperature environment(20 ±5)°С must correspond to that indicated in the table. 3.

2.4. The permissible error limit for calipers of types 1 and T-1 when measuring a depth of 20 mm must correspond to table. 3.

Table 3

mm

	Limit of permissible error of calipers (±)
Measuring length	at the vernier reading value			with the division value of the circular scale of the reading device				with discrete step of digital readout device
		0.1 for accuracy class				0.1 for accuracy class
St. 100 to 200
» 1100 » G200

Notes:

1. The nominal distance between the measuring surfaces of the jaws is taken as the measured length.

2. For calipers with one vernier, the error is checked using jaws for measuring external dimensions.

3. When moving the jaws of the calipers until they touch, the displacement of the zero stroke of the vernier is allowed only in the direction of increasing size.

4. The error of the caliper should not exceed the values ​​​​specified in the table. 3 at a temperature of (20 ± 10) ° C when checking them against plane-parallel gauge blocks made of steel.

2.5. The tolerance for flatness and straightness of the measuring surfaces should be 0.01 mm per 100 mm of length larger side measuring surface of calipers.

In this case, the permissible deviations of flatness and straightness of the measuring surfaces should be:

0.004 mm - for calipers with a reading value along the vernier, with a scale division value and a discrete step of no more than 0.05 mm and the length of the larger side of the measuring surface is less than 40 mm;

0.007 mm - for calipers with a reading value along the vernier and with a scale division value of 0.1 mm and the length of the larger side of the measuring surface is less than 70 mm.

The straightness tolerance of the rod end of type I and T-1 calipers should be 0.01 mm.

Blockages are allowed along the edges of flat measuring surfaces in an area not exceeding 0.2 mm wide.

Note. The flatness requirements only apply to surfaces wider than 4 mm.

(Changed edition. Changes No. 1, 2)

2.6. The parallelism tolerance of the measuring surfaces of the jaws for measuring internal dimensions must be 0.010 mm over the entire length. For calipers of accuracy class 2, the measuring surfaces of the edge jaws can be manufactured with a parallelism tolerance of 0.02 mm.

Blockages are allowed in the area up to 0.5 mm from the top edge of the measuring surfaces.

The parallelism tolerance per 100 mm of the length of the flat measuring surfaces of the jaws for measuring external dimensions should be:

0.02 mm - with a reading value of the vernier, scale division value and discrete step of no more than 0.05 mm;

0.03 mm - with a reading value of the vernier and a scale division value of 0.1 mm.

2.7. The backlash of the micrometric pair of the device for fine installation of the frame should not exceed 1/3 of a turn.

2.8. Deviations in the size of jaws with cylindrical measuring surfaces for measuring internal dimensions should not exceed: ( ) mm with a division value or vernier reading value of at least 0.05 mm; ( ) mm when the division value or discrete step is less than 0.05 mm.

2.9. The frame should not move along the rod under its own weight when vertical position caliper.

2.10. The force of moving the frame along the rod should be no more than the values ​​​​indicated in the table. 4.

Table 4

Upper limit of caliper measurement, mm, no more	Moving force, N, no more

Note. For calipers with a measuring range of 0-125, 0-135, 0-150 mm, the permissible values ​​of the moving force are selected from the range 10.15 N.

2.11. Requirements for the rod and vernier scale.

2.11.1 The location of the vernier scale plane relative to the rod scale plane is indicated in Fig. 7.

Damn 7

2.11.2. Distance A from the top edge of the vernier edge to the surface of the rod scale should not exceed 0.25 mm for calipers with a reading value of 0.05 and 0.30 mm for calipers with a reading value of 0.1 mm.

2.11.3. The dimensions of the strokes of the rod and vernier scales must correspond to those indicated below:

stroke width 0.08-0.20 mm;

the difference in the width of the strokes within one scale (for a rod scale at a distance of more than 0.3 from the edge of the scale) and the strokes of the rod scales and the vernier of one caliper is no more than 0.03 mm when reading along the vernier 0.05 mm; 0.05 mm with a vernier reading of 0.1 mm.

(Changed edition, Amendment No. 2).

2.12. Requirements for the circular scale of the reading device

2.12.1. The length of the scale division must be at least 1 mm.

2.12.2. The width of the scale lines is 0.15-0.25 mm. The difference in the width of the corresponding strokes within the same scale should be no more than 0.05 mm.

2.12.3. The width of the arrow above the scale divisions should be 0.15-0.20 mm. The end of the arrow should overlap short strokes by no more than 0.8 of their length. The distance between the end of the hand and the dial should not exceed 0.7 mm for a scale with a division value of no more than 0.05 mm and 1.0 mm with a division value of 0.1 mm.

2.12.4. The reading device must provide the ability to align the arrow with the zero division of the dial scale.

2.13. For calipers with a digital reading device, the height of the digits of the reading device must be at least 4 mm .

2.14. Calipers with a digital reading device can additionally be equipped with an interface for outputting the measurement result to an external device.

2.15. The hardness of the measuring surfaces of calipers must be: made of tool and structural steel - not less than 59 HRC e;

made of high-alloy steel - not less than 51.5 N R Se.

Note. For type I calipers with an upper measurement limit of up to 160 mm, made of tool or structural steel, the hardness of the measuring surfaces must be at least 53 HR Se.

2.16. Roughness parameter of flat and cylindrical measuring surfaces of calipers -RA£ 0.32 microns according to GOST 2789-73;

measuring surfaces of edge jaws and flat auxiliary measuring surfaces -RA£ 0.63 microns according to GOST 2789-73.

2.17. The outer surfaces of calipers must be coated or treated in accordance with Table. 5.

Table 5

Surface name	Upper limit of measurement, mm	Type of processing or coating of steel calipers
		highly alloyed	instrumental and structural
Rod (except scale and end), jaws, caliper frame, microfeed frame, excluding measuring and adjacent surfaces			Chrome plating
Bar and vernier scale		Matte coating	Matt chrome plating
			Chrome plating
	St. 630 to 2000		Chrome plating

Note. It is allowed to use other metallic and non-metallic coatings in accordance with GOST 9.303 and GOST 9.032, whose protective and decorative properties are not inferior to those indicated in the table. 5.

It is allowed for calipers with an upper measurement limit of over 1000 mm not to be chromed.

(Changed edition, Amendment No. 1).

2.18. Calipers must be demagnetized.

1.19-2.24 (Excluded. Amendment No. 1, 2).

2.25. Completeness

2.25.1. Each caliper must be accompanied by operational documentation according to GOST 2.601.

2.25.2. At the customer's request, type II and III calipers are equipped with a marking device.

2.26. Marking

2.26.1. Each caliper must be marked with:

manufacturer's trademark;

serial number according to the manufacturer's numbering system;

symbol Year of release;

vernier reading value or division value;

size (for calipers types II and III with one vernier or one scale, damn. 3-4) on one of the sponges;

accuracy class 2 (for calipers with a vernier reading value or a scale division value of 0.1 mm);

the word "Internal" on a scale for measuring internal dimensions.

(Changed edition, Amendment No. 2).

2.26.2. It is allowed not to indicate the serial number in the operational documentation.

2.26.3. Marking on the case is in accordance with GOST 13762.

The name or symbol of the caliper is applied only on the hard case.

2.27. Package

2.27.1. Methods and means for degreasing and preserving calipers - according to GOST 9.014.

2.27.2. Vernier calipers must be packaged in cases made of materials in accordance with GOST 13762. For vernier calipers with an upper limit of up to 630 mm inclusive, soft packaging is allowed.

2.27.3. When transported in containers, calipers with a measurement limit of over 400 mm may be packed in cases without shipping containers.

When packing without transport containers, cases with calipers must be secured so that the possibility of their movement is excluded.

3. ACCEPTANCE

3.1. To check the compliance of calipers with the requirements of this standard, state tests, acceptance inspection, and periodic tests should be carried out.

(Changed edition, Amendment No. 2).

3.2. State tests according to GOST 8.383 and GOST 8.001.

Checking the errors of calipers at a temperature of (20 ± 10) ° C is carried out only during state tests.

3.3. During acceptance inspection, each caliper is checked for compliance with the requirements of paragraphs. 1.3; 1.4; 1.6; 1.8; 2.3-2.10; 2.12.4; 2.16; 2.18; 2.25; 2.26.

3.4. Periodic tests are carried out at least once every 3 years on at least 3 calipers of each standard size from those that have passed acceptance control for compliance with all the requirements of this standard.

(Changed edition, Amendment No. 2).

Test results are considered satisfactory if all samples meet all tested requirements.

3.5 (Deleted. Amendment No. 2).

4. CONTROL AND TEST METHODS

4.1. Verification of calipers according to GOST 8.113 and MI 1384.

4.2. When determining the influence of transport shaking, an impact stand is used, which creates shaking with an acceleration of 30 m/s 2 at a frequency of 80-120 beats per minute.

Vernier calipers in packaging are attached to a stand and tested at total number blows 15000. After testing, the error of calipers should not exceed the values ​​​​indicated in the table. 3.

It is allowed to test calipers by transporting them to truck at a speed of 20-40 km/h for a distance of at least 100 km on a dirt road.

4.3. Impact of climatic factors external environment during transportation, they are determined in climatic chambers in the following modes: at a temperature of minus (50 ± 3) ° C, plus (50 ± 3) ° C and at humidity (95 ± 3)%. Exposure in the climatic chamber for each of the three types of tests is 2 hours. After the tests, the error of the calipers should not exceed the values ​​​​indicated in the table. 3.

It is allowed, after holding the calipers in each mode, to keep it under normal conditions for 2 hours.

5. TRANSPORTATION AND STORAGE

Transportation and storage - according to GOST 13762.

6. OPERATING INSTRUCTIONS

Calipers were allowed to be used at ambient temperatures from 10 to 40°C and relative humidity air - no more than 80% at a temperature of 25°C.

7. MANUFACTURER WARRANTY

The manufacturer guarantees that calipers comply with the requirements of this standard subject to the conditions of transportation, storage and operation.

The warranty period for calipers is 12 months from the date of commissioning, calipers equipped with a hard alloy is 18 months, and when sold through a retail network, it is 12 months from the date of sale.

APPLICATION

Tactile

LIST OF FUNCTIONS CHARACTERIZING THE DEGREE OF AUTOMATION

1. Issuance of digital information in direct code (indicating the sign and absolute value).

2. Setting the origin in the absolute coordinate system.

3. Storing the measurement result*.

4. Memory extinction with restoration current result measurements*.

5. Output of measurement results to an external device*.

6. Pre-zero stop.

7. Preset number (input of constants)*.

8. Comparison of measurement results with threshold limits*.

9. Arithmetic operations with measurement results and constants*.

* By customer request.

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the Ministry of Machine Tool and Tool Industry

PERFORMERS

M. B. Shabalina, Ph.D. tech. Sciences (topic leader); N. V. Semenova

2. APPROVED AND ENTERED INTO EFFECT by the Resolution State Committee USSR on product quality management and standards dated October 30, 1999 No. 3253

3. INSTEAD GOST 166-80

4. The inspection period is Q3. 1994, periodicity - 5 years

5. The standard fully complies with ST SEV 704-77-ST SEV 707-77, ST SEV 1309-78, ISO 3599-76

6. REFERENCE REGULATIVE AND TECHNICAL DOCUMENTS

	Item number
GOST 2.601-68
GOST 8.001-80
GOST 8.113-85
GOST 8.383-80
GOST 9.014-78
GOST 9.032-74
GOST 9.303-84
GOST 27.410-87
GOST 3882-74
GOST 13762-86	2.26.3; 2.27.2; 5