VERNIER CALIPS
TECHNICAL CONDITIONS
GOST 166-89
(ST SEV 704-77¸ ST SEV 707-77; ST SEV 1309-78, 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 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.
(Changed edition, Amendment No. 2).
1.1 . Calipers should be made of the following main types:
I - double-sided with depth gauge (Fig. );
T-1 - one-sided with a depth gauge with measuring surfaces made of hard alloys (drawing);
II - double-sided (drawing) );
III - one-sided (Fig. ).
Note: It is allowed to equip calipers with devices or auxiliary measuring surfaces for expansion functionality(measurements of heights, ledges, etc.).
Notes:
1. The lower limit of measurement for calipers with an upper limit of up to 400 mm 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 hard alloy (Hard alloy according to GOST 3882)
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 vernier reading value 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
(Changed edition).
(Changed edition. Amendment No. 1).
(Changed edition).
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. at temperature (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 the length of the larger side of the measuring surface of the 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. Amendment 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 vernier reading value, 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 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 the caliper is in a vertical position.
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. .
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 over 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 operational documentation for GOST 2.601.
2.25.2 . At the customer's request, calipers of types II and III are equipped with a device for marking.
2.26 .Marking
The 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.
| Designation: | GOST 166-89* |
| Russian name: | Calipers. Specifications |
| Status: | active |
| 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).
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 discreteness 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.
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, their metrological characteristics;
Acquiring the skill of using calipers, calipers
depth gauge and micrometer.
The concept of the absolute measurement method
Measurement of linear dimensions is performed absolute and relative
telny methods.
With the absolute method, the measurement result is read
directly according to the shown measuring instrument. A distinctive feature of 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 value countdown
(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 rod 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.
GOST 166-89(ISO 3599-76)
Group P53
INTERSTATE STANDARD
VERNIER CALIPS
Specifications
Vernier callers. Specifications
ISS 17.040.30
OKP 39 3310
Date of introduction 1991-01-01
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 Resolution of the USSR State Committee for Product Quality Management and Standards dated October 30, 1989 N 3253
3. INSTEAD GOST 166-80
4. The standard fully complies with ST SEV 704-77 - ST SEV 707-77, ST SEV 1309-78, ISO 3599-76
5. REFERENCE REGULATIVE AND TECHNICAL DOCUMENTS
Item number |
|
GOST 2.601-95 | |
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 2789-73 | |
GOST 3882-74 | |
GOST 13762-86 | 2.26.3; 2.27.2; 5 |
MI 1384-86 |
________________
* In the territory Russian Federation the document is not valid. GOST R 27.403-2009 is in force. - Database manufacturer's note.
6. The validity period was removed by Decree of the State Standard of October 12, 1992 N 1353
7. EDITION (August 2003) with Amendments No. 1, 2, approved in July 1990, October 1992 (IUS 11-90, 1-93)
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.
1. TYPES, MAIN PARAMETERS AND DIMENSIONS
1.1. Calipers should be made of the following main types:
I - double-sided with a depth gauge (Fig. 1);
T-1 - single-sided with a depth gauge with measuring surfaces made of hard alloys (Fig. 2);
II - double-sided (Fig. 3);
III - one-sided (Fig. 4).
Note. It is allowed to equip calipers with devices or auxiliary measuring surfaces to expand functionality (measure heights, ledges, etc.).
1
- rod; 2
- frame; 3
- clamping element; 4
- vernier; 5
6
- depth gauge; 7
- jaws with edge measuring surfaces for measuring internal dimensions; 8
9
- rod 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
- rod 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
- rod 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
- rod scale
Damn.4
(Changed edition, Amendment No. 1).
1.2. Vernier calipers should be made with vernier reading (SD) (Fig. 1-4) or with circular scale reading (SCC) (Fig. 5), or with a digital reading device (DVR) (Fig. 6).
1
- circular scale of the reading device; 2
- rod; 3
- frame; 4
- rod scale
Damn.5
1
- digital reading device; 2
- rod; 3
- frame
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 vernier calipers must correspond to those indicated in Table 1.
Table 1
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. The lower limit of measurement for calipers with an upper limit of up to 400 mm is established for measuring external dimensions. 2. With calipers type T-I The measuring range only applies to measurements of external dimensions and depth. 3. The upper limit of measurement of type I and T-I calipers should be no more than 300 mm. 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 made of carbide. (Carbide alloy according to GOST 3882). |
|||
An example of a type II caliper symbol with a measuring range of 0-250 mm and a vernier reading value of 0.05 mm:
Vernier caliper ShTs-II-250-0.05 GOST 166-89
The same, type II calipers with a measuring range of 250-630 mm and a vernier reading value of 0.1 mm, accuracy class 1:
Vernier caliper ShTs-II-250-630-0.1-1 GOST 166-89
The same, type I calipers with a measuring range of 0-150 mm with a dial division of 0.02 mm:
Vernier caliper ShTsK-I-150-0.02 GOST 166-89
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-I-125-0.01 GOST 166-89
1.4. Vernier calipers of 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. The extension of the jaws for measuring external dimensions and the extension of the jaws and for measuring internal dimensions must correspond to those indicated in Table 2 (Figures 1-4).
table 2
Range | |||||
no less |
|||||
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 ).
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 the range: 9; 19; 39 mm - with a vernier reading value of 0.1 mm, 19; 30 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 source 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 readout device should ensure correct readings at maximum permissible speed frame movement of at least 0.5 m/s.
1.11. (Deleted, Amendment No. 2).
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) °C must correspond to that specified in Table 3.
2.4. The permissible error limit of calipers of types I and T-I when measuring depth equal to 20 mm must correspond to Table 3.
Table 3
Measuring length | Limit of permissible error of calipers (±) |
|||||||
at the vernier reading value | with the division value of the circular scale of the reading device | with discreteness step of digital readout device |
||||||
0.1 for accuracy class | 0.1 for accuracy class | |||||||
St. 100 to 200 | ||||||||
" 800 " 1000 | ||||||||
" 1000 " 1100 | ||||||||
" 1100 " 1200 | ||||||||
" 1200 " 1300 | ||||||||
" 1300 " 1400 | ||||||||
" 1400 " 1500 | ||||||||
" 1500 " 2000 | ||||||||
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 indicated in 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 the length of the larger side of the measuring surface of the 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-I 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, Amendment 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 vernier reading value, 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 a revolution.
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 the caliper is in a vertical position.
2.10. The force of moving the frame along the rod should be no more than the values indicated in Table 4.
Table 4
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 Figure 7.
2.11.2. The distance from the upper 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 mm 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 reading device digits 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: from tool and structural steel - not less than 59;
from high-alloy steel - no less than 51.5.
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.
2.16. The roughness parameter of flat and cylindrical measuring surfaces of calipers is 0.32 microns according to GOST 2789;
measuring surfaces of edge jaws and flat auxiliary measuring surfaces - 0.63 microns according to GOST 2789.
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 treatment or coating |
|
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, with protective and decorative properties not inferior to those indicated in Table 5. |
|||
2.16, 2.17. (Changed edition, Amendment No. 1).
2.18. Calipers must be demagnetized.
2.19. (Deleted, Amendment No. 2).
2.20. (Deleted, Amendment No. 1).
2.21-2.24. (Excluded, Amendment No. 2).
2.25. Completeness
2.25.1. Each caliper must be accompanied by operational documentation in accordance with GOST 2.601*.
________________
* GOST 2.601-2006 is in force on the territory of the Russian Federation. - Database manufacturer's note.
2.25.2. At the customer's request, calipers of types II and III are equipped with a device for marking.
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 type II and III calipers with one vernier or one scale, Fig. 3-4) on one of the jaws;
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 transport packaging.
When packing without transport containers, cases with calipers must be secured so that the possibility of their movement is excluded.
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*.
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* PR 50.2.009-94** applies on the territory of the Russian Federation.
** The document is not valid on the territory of the Russian Federation. The procedure for testing standard samples or measuring instruments for the purpose of type approval, the Procedure for approving the type of standard samples or the type of measuring instruments, the Procedure for issuing certificates of approval of the type of standard samples or the type of measuring instruments, establishing and changing the validity period of these certificates and the interval between verifications of measuring instruments are in effect. , Requirements for type approval marks of standard samples or type of measuring instruments and the procedure for their application, approved by Order of the Ministry of Industry and Trade of Russia dated November 30, 2009 N 1081. - Note from the database manufacturer.
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 clause 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 testing 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.
Test results are considered satisfactory if all samples meet all tested requirements.
(Changed edition, Amendment No. 2).
3.5. (Deleted, Amendment No. 2).
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 at a frequency of 80-120 beats per minute.
The calipers in the package are attached to the stand and tested with a total number of impacts of 15,000. After testing, the error of the calipers should not exceed the values specified in Table 3.
It is allowed to test calipers by transporting them on a truck at a speed of 20-40 km/h over a distance of at least 100 km along 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 Table 3.
It is allowed, after holding the calipers in each mode, to keep it under normal conditions for 2 hours.
Transportation and storage - according to GOST 13762.
Calipers can be used at ambient temperatures from 10 to 40 °C and relative air humidity - no more than 80% at a temperature of 25 °C.
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, for calipers equipped with a hard alloy - 18 months, and when sold through a retail network - 12 months from the date of sale.
APPLICATION
Mandatory
1. Issuance of digital information in direct code (indicating the sign and absolute value).
2. Setting the reference point in absolute system coordinates
3. Storing the measurement result*.
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* By customer request.
4. Memory clearing with restoration of the current measurement result*.
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* By customer request.
5. Output of measurement results to an external device*.
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* By customer request.
6. Pre-zero setting.
7. Preset number (input of constants)*.
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* By customer request.
8. Comparison of measurement results with threshold limits*.
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* By customer request.
9. Arithmetic operations with measurement results and constants*.
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* By customer request.
ROSSTANDART FA on technical regulation and metrology
NEW NATIONAL STANDARDS: www.protect.gost.ru
FSUE STANDARDINFORM provision of information from the Russian Products database: www.gostinfo.ru
FA ON TECHNICAL REGULATION"Dangerous goods" system: www.sinatra-gost.ru
