Requirements for normal conditions for performing linear and angular measurements. requirements for normal conditions for linear and angular measurements Normal conditions for linear and angular measurements
STATE STANDARD OF THE UNION OF THE SSR
STATE PROVISION SYSTEM
UNIT OF MEASUREMENTS
NORMAL PERFORMANCE CONDITIONS
LINEAR AND ANGULAR MEASUREMENTS
GOST 8.050-73
(st sev 1155-78)
STATE STANDARDS COMMITTEE
USSR COUNCIL OF MINISTERS
Moscow
(Revised edition, Rev. No. 1).
DEVELOPED AND INTRODUCED by the All-Union Research Institute of Metrology. DI. Mendeleev (VNIIM)
Director Arutyunov V.O.
Theme leader Zeitlin Ya.M.
Artists: Zeitlin Ya.M., Gofman I.A.
PREPARED FOR APPROVAL
Department of machine-tool industry and intersectoral productions State Committee standards of the Council of Ministers of the USSR
Head of Department Bergman V.P.
Art. engineer Lepid N.M.
All-Union Research Institute of the State Committee for Standards of the Council of Ministers of the USSR (VNIIGK)
Head of laboratory Bulatov S.B.
Head laboratory Eidinov V.Ya.
APPROVED by the State Committee for Standards of the Council of Ministers of the USSR on December 15, 1972 (Minutes No. 192)
Deputy chairman of the branch scientific and technical commission Bergman V.P.
Commission members: Dolyakov V.G., Zlatkovich L.A., Klimov G.N., Baranov N.N.
INTRODUCED BY Decree of the State Committee for Standards of the Council of Ministers of the USSR dated February 21, 1973 No. 425
STATE STANDARD OF THE UNION OF THE SSR
|
NORMAL PERFORMANCE CONDITIONS State system for ensuring the uniformity of |
GOST (st sev 1155-78) |
By the Decree of the State Committee for Standards of the Council of Ministers of the USSR dated November 21, 1973 No. 425, the validity period is established
from 01.01.1975
until 01.01.1985
(Revised edition, Rev. No. 1).
This International Standard specifies requirements for normal conditions for measuring lengths (linear dimensions) and angles (angular dimensions).
The requirements specified in this standard are recommended for use in the design, development and implementation of measurement processes for objects that do not have internal heat sources.
Normal conditions must be ensured during measurements in order to practically exclude additional errors.
The standard fully complies with ST SEV 1155-78.
(Revised edition, Rev. No. 1).
. NORMAL VALUES OF MAIN INFLUENCING QUANTITIES
|
Rows of limits of permissible values δ in. l, µm |
From v.1 to 3 |
» 120 » 180 |
Note. Tolerances of the measured values Δ l in microns, indicated in table. , correspond to:
from I to VIII series - tolerances for accuracy classes 02-09 according to GOST 11472-69;
|
Rows of limits of permissible values δ in. y for degrees of accuracy according to GOST 8908 -58 |
2" 00" |
3" 00" |
5" 00" |
1" 40" |
2" 30" |
4" 00" |
2" 00" |
3" 00" |
1" 40" |
2" 30" |
2" 00" |
1" 40" |
2" 30" |
2" 00" |
1" 40" |
|
page 1
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page 5
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page 7
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page 18
page 19
STATE STANDARD OF THE UNION OF THE SSR
STATE PROVISION SYSTEM
UNIT OF MEASUREMENTS
NORMAL PERFORMANCE CONDITIONS
LINEAR AND ANGULAR MEASUREMENTS
This International Standard specifies requirements for normal conditions for measuring lengths (linear dimensions) and angles (angular dimensions).
The requirements specified in this standard are recommended for use in the design, development and implementation of measurement processes for objects that do not have internal heat sources.
Normal conditions must be ensured during measurements in order to practically exclude additional errors.
The standard fully complies with ST SEV 1155-78.
1. NORMAL VALUES OF MAIN INFLUENCING QUANTITIES
1.1. Temperature environment 20 °С (according to GOST 9249-59).
1.2. Atmospheric pressure 101325 Pa (760 mm Hg).
1.3. Relative humidity of the ambient air 58% (normal partial pressure of water vapor 1333 Pa).
1.4. Free fall acceleration (acceleration of gravity) 9.8 m/s 2 .
1.5. The direction of the line and plane of measurement of linear dimensions is horizontal (90° from the direction of gravity).
1.6. The position of the angle measurement plane is horizontal (90° from the direction of gravity).
1.7. Relative movement speed external environment equals zero.
1.8. Values of external forces, except for gravity, atmospheric pressure, action magnetic field The earth and the adhesion forces of the elements of the measuring system (installation) are equal to zero.
Note. For comparability, measurement results should be reduced to normal values of influencing quantities with an error not exceeding 35% of the permissible measurement error. In justified cases, it is allowed to bring the measurement results to other nominal values of the influencing quantities established in each individual case in the relevant state standards.
2. REQUIREMENTS FOR NORMAL CONDITIONS FOR PERFORMING LINEAR AND ANGULAR MEASUREMENTS
2.1. The limits of the normal range of values of the influencing quantities are set depending on the tolerances and the range of measured dimensions (Tables 1 and 2).
2.2. The normal range of values of the influencing quantities in linear measurements is the area, providing for which the output δ in. l of the actual value of the instrumental error (error of the measuring instrument) beyond the limit of the permissible basic error of the measuring instrument does not exceed the values \u200b\u200bspecified in Table. one.
The table is compiled under the condition that the limit of permissible measurement error as a percentage of Δ l is 35% for I - VIII rows, 30% for IX, X, 25% for XI, XII and 20% for XIII, XIV rows.
2.3. The normal range of values of the influencing quantities for angular measurements is the area, providing for which the output δ in. at the actual value of the instrumental error (error of the measuring instrument) beyond the limit of the permissible basic error of the measuring instrument should not exceed the values \u200b\u200bspecified in Table. 2.
The table is compiled under the condition that the limit of measurement error is 35% of Δ y, where Δ y is the tolerance for the measured angle.
2.4. With the limits of the permissible measurement error exceeding the values \u200b\u200bspecified in paragraphs. 2.2 and 2.3 for the corresponding series, the normal conditions are selected from a coarser series. With a decrease in the permissible measurement error, the normal conditions should be selected according to a more accurate series.
2.5. With tolerances on the size of the product that do not correspond to the values \u200b\u200bspecified in table. 1 and 2, allowed values δ in. . l and δ in. y are selected according to the nearest smaller tolerance value for the corresponding size range.
2.6. Normal conditions for determining the basic error of measuring instruments are established in the standards for these instruments. The basic error of the working measuring instruments should be determined under normal conditions corresponding to the normal range of values of the influencing quantities for rows with a permissible measurement error equal to the limit of the permissible basic error of the verified means. Deviations from the specified equality should not exceed the values of δ in. . l for linear measurements and δ in. y for angular measurements.
Table 1
|
Size ranges, mm |
Rows of limits of permissible values δ in. l, µm |
|||||||||||||||||||||||||||
|
» 120 » 180 |
||||||||||||||||||||||||||||
Note. Tolerances of the measured values Δ l in microns, indicated in table. 1, match:
from I to VIII series - tolerances for accuracy classes 02-09 to GOST 11472-69 ;
IX, X, XI, XII, XIV rows - tolerances for accuracy classes, respectively, 1, 2, 2a, 3, 3a according to OST NKM 1011, OST 1012, OST NKM 1016, OST 1013, OST NKM 1017;
XIII series - tolerances Sh 3.
table 2
|
Ranges of lengths of the smaller side of the corner, mm |
Rows of limits of permissible values δ in. y for degrees of accuracy in GOST 8908 -58 |
|||||||||
|
2" 00" |
3" 00" |
5" 00" |
||||||||
|
1" 40" |
2" 30" |
4" 00" |
||||||||
|
2" 00" |
3" 00" |
|||||||||
|
1" 40" |
2" 30" |
|||||||||
|
2" 00" |
||||||||||
|
1" 40" |
2" 30" |
|||||||||
|
2" 00" |
||||||||||
|
1" 40" |
||||||||||
2.7. When the influencing quantities go beyond the normal range of values during the measurement process and it is impossible (inexpedient) to bring the measurement result to normal conditions, the actual values of the influencing quantities are recorded.
2.8. If the requirements of clause 2.2 (2.3) are met and a certified (standardized) measurement procedure is available, it is allowed not to introduce corrections for the exit of the influencing quantities beyond the normal range of values and not to record the actual values of the influencing quantities. In this case, the random component of the difference between the values of the measured value and the set level of adjustment of the measuring instrument should not exceed 25% of the tolerance for the measured value.
2.9. Maintaining normal conditions in the workspace must be ensured during the entire measurement process.
Note. The dimensions of the working space are established when developing methods for performing measurements.
2.10. During measurements, the current sanitary and safety regulations must be observed. The air supplied to the working space must be free of dust, vapors, oils, aerosols, toxic and corrosive gases.
3. NORMAL LIMITS FOR THE VALUES OF THE INFLUENCING QUANTITIES
3.1. Normal limits for the values of influencing quantities in linear measurements
3.1.1. Limits of permissible deviations from the normal direction of the measurement line and normalized parameters of the orientation of measuring instruments and objects:
± 1° - for I - III rows;
± 2° - for IV - VIII rows;
± 5° - for IX - XIV rows.
3.1.2. The limits of permissible deviation of the temperature of the object of measurement and the working space from the normal value during the measurement process must correspond to those indicated in Table. 3.
Table 3
3.1.3. It is not recommended to place measurement objects with a temperature deviation on the surface from normal by more than 1.5 in the working space; 2.5; 3.5, 5 °C, respectively, for I - III; IV - VIII; IX-XI; XII - XIV rows. In this case, the exposure time in the working space at the temperature specified in clause 3.1.2, before the start of measurements, must be at least that indicated in Table. four.
Table 4
Note. If the surface temperature of the measurement objects placed in the working space exceeds the values specified in clause 3.1.3, the exposure time must be increased.
3.1.4. Measuring instruments must be in conditions that meet the requirements of clause 3.1.2, at least 24 hours before the start of measurements.
3.1.5. The limits of the non-stationary component of the temperature difference allowed during the measurement process at any two points and the temperature change at any point of the working space and the surfaces of the object and measuring instruments located in it must correspond to those indicated in Table. 5.
Only smooth temperature changes at a rate of not more than 0.1 ° s / min are allowed in the working space. Separate fluctuations with a period of less than 0.5 min are not taken into account.
Table 5
|
Permissible temperature deviations from normal, °С |
Permissible temperature changes, °C |
Permissible temperature difference at two points, °C |
|
|
within 0.5 h |
within 12 hours |
||
* Provided when the operator is located outside the workspace.
Note. The norms indicated in the table. 5, apply to the conditions for comparing measures and measurement objects with a difference in linear expansion coefficients of not more than 7 10 -6 K-1 with a total mass of measurement tools and objects of not more than 500 kg.
3.1.6. The frequency of disturbing harmonic vibrations acting on the means and the object of measurement should not exceed 30 Hz. The amplitude of disturbing vibrations in millimeters at a frequency of more than 1 Hz should not exceed the values determined by the dependence
V - amplitude of oscillation speed;
υ - the reduced amplitude of the oscillation speed;
f- vibration frequency, Hz.
At vibration frequencies less than 1 Hz, the vibration amplitude should not exceed the values A indicated in Table. 6.
Under the influence of disturbing vibrations with the parameters of the spectral components that go beyond the normal limits, the fluctuation range of the reference index of the device and the additional error of the measuring instrument should not exceed 0.2 scale divisions and 0.2 of the permissible measurement error, respectively.
Table 6
|
υ , mm/s |
|||
3.1.7. The ambient air pressure in the working space should not be less than atmospheric pressure. It is allowed to exceed the atmospheric pressure by no more than 3 kPa.
3.1.8. The amount of solid dust particles in 1 m 3 of air in the working space should not exceed the values \u200b\u200bspecified in Table. 7.
Table 7
|
Dust particle size, microns, no more |
The number of dust particles in 1 m 3 of air |
|
Note. The number of smaller particles for the corresponding series is not standardized, and the presence of larger particles is not allowed.
3.1.9. Limits of permissible deviation of air humidity in the working space from normal ± 20%.
With interference linear measurements corresponding to rows I - VI, the limits of permissible deviation of air humidity in the working space from normal ± 5%; the normal content of carbon dioxide is 0.03%.
It is allowed not to measure the actual content of carbon dioxide and to increase the limits of the permissible deviation of humidity up to ± 10%, provided that during the measurement the refractive index of air is determined with an error not exceeding the values \u200b\u200bspecified in Table. eight.
Table 8
|
Dimensions, mm |
Limit of permissible errors for rows |
|||
Note. Refractive index of normal air P n = 1.00027159 for the primary reference wavelength λ n = 605.61574 nm and P n = 1.00027259 - for the secondary reference wavelength λ n = 546.07819 nm.
3.1.10. The highest speed of air movement in the working space should not exceed 0.1 m / s for measurements corresponding to rows I - VIII, and 0.2 m / s for measurements corresponding to rows IX - XIV.
3.1.11. The limits of illumination of the working space with general illumination are set in accordance with those indicated in Table. 9.
Table 9
3.1.12. The noise level in the working space should not exceed 45 dB for measurements corresponding to rows I - VIII, and 80 dB - for measurements corresponding to rows IX - XIV.
3.1.13. The magnetic field strength should not exceed 80 A / m, the electrostatic field strength - 5 V / m.
3.1.14. The limits of the permissible amplitude of the magnetic field oscillations during the measurement process in the presence of unshielded electromagnetic transducers in the measuring instruments are 10 A/m.
3.1.15. The error of the measuring instrument, caused by contact deformations at the point of contact of the measuring tip with the measured object, should not exceed 0.1 of the permissible measurement error, which is ensured by the choice of material and shape of the measuring surfaces, the normalization of the measuring force and its fluctuations.
3.2. Normal limits for influence quantities in angular measurements
3.2.1. Limits of permissible deviations from the normal position of the plane for measuring angles and normalized parameters for the orientation of measuring instruments and objects:
± 0.5° for 1st, 2nd degrees of accuracy;
± 1.5° for 3-5 degrees of accuracy.
3.2.2. Limits of permissible deviation of the temperature of the measurement object and the working space during the measurement process from the normal value ± 3.5 °С.
3.2.3. The limits of the non-stationary component of the temperature difference allowed during the measurement process at any two points and the temperature change at any point of the working space of the surfaces of the object and measuring instruments must correspond to those indicated in Table. ten.
Only smooth temperature changes at a rate of not more than 0.2 °C/min are allowed in the working space. Individual pulses shorter than 0.5 min are not taken into account.
Table 10
3.2.4. The frequency and amplitude of disturbing vibrations must correspond to those specified in clause 3.1.6 when A= 0.01 mm, υ \u003d 0.01 mm / s - for 1, 2 degrees of accuracy and A= 0.03 mm, υ \u003d 0.03 mm / s - for 3 - 5 degrees of accuracy.
3.2.5. The deviation of air humidity in the working space from the normal value should not exceed ± 10% for measurements corresponding to the 1st - 3rd degrees of accuracy, and ± 25% - for measurements corresponding to the 4th, 5th degrees of accuracy.
3.2.6. The noise level in the working space should not exceed 55 dB for measurements corresponding to the 1st, 2nd degrees of accuracy, and 80 dB - for measurements corresponding to the 3rd - 5th degrees of accuracy.
3.2.7. The highest speed of air movement in the working space should not exceed 0.1 m/s for measurements corresponding to the 1st - 3rd degrees of accuracy, and 0.2 - for measurements corresponding to the 4th, 5th degrees of accuracy.
3.2.8. The normal limits and requirements for the normal range of other influence quantities must comply with the requirements of paragraphs. 3.1.7, 3.1.8 (for angles of the 1st, 2nd degree of accuracy along the IX - XI rows, for angles of the 3rd - 5th degree of accuracy along the XII row), paragraphs. 3.1.11, 3.1.13, 3.1.14 and 3.1.15 of this standard.
ATTACHMENT 1toGOST 8.050-73
Reference
DEFINITION OF THE MOST IMPORTANT CONCEPTS FOUND IN THE STANDARD
1. Normal limits of values of influencing quantities - limits of the normal range of values of influencing quantities, established regardless of the type of measuring instrument selected with the condition that the requirements of clause 2.2 (2.3) are met.
2. Working space - a part of the space surrounding the means and the object of measurement, the action of influencing quantities outside of which the measurement result can be neglected.
APPENDIX 2toGOST 8.050-73
Reference
REQUIREMENTS FOR MEASUREMENT OBJECTS
1. The roughness of the surfaces, the dimensions of which are to be measured, should not be rougher than indicated in the table.
|
Surface cleanliness classes according to GOST 2789 -59 |
Rows according to this standard |
Size range, mm |
||
|
linear measurements |
angular measurements |
linear |
smaller side of the angle |
|
|
St. 10 to 80 |
||||
|
St. 80 to 180 |
||||
|
St. 180 to 360 |
||||
|
St. 360 to 500 |
||||
|
St. 360 to 500 |
St. 32 to 120 |
|||
|
St. 180 to 500 |
St. 120 to 500 |
|||
|
St. 360 to 500 |
St. 200 to 500 |
|||
|
St. 360 to 500 |
St. 200 to 500 |
|||
2. Deviations in the shape and location of the measured surfaces must comply with the requirements GOST 10356-63.
APPENDIX 3toGOST 8.050-73
Reference
ALLOWED VALUES δ in. l FOR ISO CLASSIFICATIONS
When assigning tolerances for ISO qualifications, the output δ in. l of the actual value of the instrumental error (error of the measuring instrument) under normal conditions beyond the limit of the permissible basic error of the measuring instrument should not exceed the values \u200b\u200bspecified in the table.
STATE STANDARD
UNION SSR
STATE SYSTEM FOR ENSURING THE UNIFORMITY OF MEASUREMENTS
GOST 8.050-73
Official edition
STATE COMMITTEE OF STANDARDS OF THE COUNCIL OF MINISTERS OF THE USSR
STATE STANDARD
UNION SSR
STATE UNITY SYSTEM
MEASUREMENTS
NORMAL CONDITIONS FOR LINEAR AND ANGULAR MEASUREMENTS
GOST 8.050-73
Official edition
DEVELOPED AND INTRODUCED by the All-Union Research Institute of Metrology. D. I. Mendeleev (VNIIM)
Director V. O. Arutyunov
The leader of the topic Zeitlin Ya-M.
Performers: Zeitlin Ya. M. t Gofman I. A.
PREPARED FOR APPROVAL
Department of the machine-tool industry and intersectoral production of the State Committee of Standards of the Council of Ministers of the USSR
Head of Department Bergman V.P.
Art. engineer Lepnd N. M.
All-Union Research Institute of the State Committee for Standards of the Council of Ministers of the USSR (VNIIGK)
Head of the laboratory Bulatov S. B.
Head laboratory Eidinov V. Ya.
APPROVED by the State Committee for Standards of the Council of Ministers of the USSR on December 15, 1972 (Minutes No. 192)
Deputy Chairman of the branch scientific and technical commission Bergman V.P. Members of the commission: Dolyakov V.G., Zlatkovich L.A., Klimov G.N., Baranov N.N.
INTRODUCED BY Decree of the State Committee for Standards of the Council of Ministers of the USSR dated February 21, 1973 No. 425
©Standards Publishing, 1973
Editor A. I. Lomina Technical editor S. Yu, Mironova Proofreader E. I. Evteeva
Handed over to the set 12/1II 1973 Signed, printed. 7/V 1973 1.0 p. l. Tyr. YUOOOO
Standards Publishing House. Moscow, D-22, Novopresnensky per., 3 Kaluga printing house of standards, st. Moscow, 256, Zak.491
UDC 531.7(083.74) Group Т80
STATE STANDARD OF THE UNION OF THE SSR
State system ensuring the uniformity of measurements
NORMAL CONDITIONS FOR LINEAR AND ANGULAR MEASUREMENTS
State system for ensuring the uniformity of measurements. Reference conditions for linear and angular measurements
By the Decree of the State Committee for Standards of the Council of Ministers of the USSR dated 21/II 1973 “No. 425, the validity period is set
from 01.01.1975 to 01.01.1985
This standard specifies requirements for normal conditions for performing linear measurements in the range of 1 to 500 mm and measuring angles with a shorter side length of up to 500 mm.
The requirements specified in this standard are recommended for use in the design, development and implementation of measurement processes for objects that do not have internal heat sources.
Normal conditions must be ensured during measurements in order to practically exclude additional errors.
1. NORMAL VALUES OF MAIN INFLUENCING QUANTITIES
1.1. Ambient temperature 20°C (according to GOST 9249-59).
1.2. Atmospheric pressure 101324.72 Pa (760 mm Hg).
1.3. The relative humidity of the ambient air is 58^o (the normal partial pressure of water vapor is 1333.22 Pa).
1.4. Free fall acceleration (acceleration of gravity) 9.8 m/s 2 .
1.5. The direction of the line for measuring linear dimensions up to 160 mm at the outer surfaces is vertical, in other cases it is horizontal.
1.6. The position of the angle measurement plane is horizontal.
1.7. The relative velocity of the environment is zero.
1.8. The values of external forces, except for gravity, atmospheric pressure, the action of the Earth's magnetic field and the adhesion forces of the elements of the measuring system (installation), are equal to zero.
Note. For comparability, the measurement results must be reduced to normal values of the influencing quantities with an error not exceeding 35% of the permissible measurement error.
2. REQUIREMENTS FOR NORMAL CONDITIONS FOR PERFORMING LINEAR AND ANGULAR MEASUREMENTS
2.1. The limits of the normal range of values of the influencing quantities are set depending on the tolerances and the range of measured dimensions (Tables 1 and 2).
2.2. The normal range of values of the influencing quantities in linear measurements is the area in which the output b in l of the actual value of the instrumental error (error of the measuring instrument) beyond the limit of the permissible basic error of the measuring instrument does not exceed the values \u200b\u200bspecified in Table. one.
The table is compiled under the condition that the limit of permissible measurement error as a percentage of D l is 35% for I-VIII rows, 30% for IX, X, 25% for XI, XII and 20% for XIII, XIV rows.
2.3. The normal range of values of the influencing quantities in angular measurements is the region, in which the output of the bin at the actual value of the instrumental error (error of the measuring instrument) beyond the limit of the permissible basic error of the measuring instrument should not exceed the values indicated in Table. 2.
The table is compiled under the condition that the limit of measurement error is 35% of D y, where D y is the tolerance for the measured angle.
2.4. With the limits of the permissible measurement error exceeding the values \u200b\u200bspecified in paragraphs. 2.2 and 2.3 for the corresponding series, the normal conditions are selected from a coarser series. With a decrease in the permissible measurement error, the normal conditions should be selected according to a more accurate series.
2.5. With tolerances on the size of the product that do not correspond to the values \u200b\u200bspecified in table. 1 and 2, the allowable values \u200b\u200bof inl and bii.y are selected according to the nearest lower tolerance value for the corresponding size range.
2.6. Normal conditions for determining the basic error of measuring instruments are established in the standards for these instruments. The main error of the working measuring instruments should be determined
|
Rows limit in allowable values 6 ”sqm |
||||||||||||||
|
Ranges sizes, | ||||||||||||||
GOST 8.050-73 Page
Continuation
Rows of limits of permissible values 6, microns
|
Ranges sizes, | |||||||||||||||
Note. Tolerances of the measured values D l in microns, indicated in table. 1, correspond to: from I to VIII series - tolerances for clans of accuracy 02-OY according to GOST 11472-69:
XIII series - tolerances Sh 3.
1011,
Page 4 GOST 8.050-73
Rows of tolerance limits $ in
|
Shorter side length ranges |
degrees |
Accuracy according to GOST 8908- | ||||||||
divide under normal conditions corresponding to the normal range of values of the influencing quantities for series with an allowable measurement error equal to the limit of the allowable basic error of the means being checked. Deviations from the specified equality should not exceed the values of bin.l for linear measurements and bin.y for angular measurements.
2.7. When the influencing quantities go beyond the normal range of values during the measurement process and it is impossible (inexpedient) to bring the measurement result to normal conditions, the actual values of the influencing quantities are recorded.
2.8. If the requirements of clause 2.2 (2.3) are met and a certified (standardized) measurement procedure is available, it is allowed not to introduce corrections for the exit of the influencing quantities beyond the normal range of values and not to record the actual values of the influencing quantities. In this case, the random component of the difference between the values of the measured value and the set level of adjustment of the measuring instrument should not exceed 25% of the tolerance for the measured value.
2.9. Maintaining normal conditions in the workspace must be ensured during the entire measurement process.
Note. The dimensions of the working space are established when developing methods for performing measurements.
2.10. During measurements, the current sanitary and safety regulations must be observed. The air supplied to the working space must be free of dust, vapors, oils, aerosols, toxic and corrosive gases.
3. NORMAL LIMITS FOR THE VALUE OF INFLUENCING QUANTITIES
3.1. Normal limits for the values of influencing quantities in linear measurements
3.1.1. Limits of permissible deviations from the normal direction of the measurement line and normalized parameters of the orientation of measuring instruments and objects:
±1° - for I-III rows;
±2° - for IV-VIII rows;
±5° - for IX-XIV rows.
3.1.2. The limits of permissible deviation of the temperature of the object of measurement and the working space from the normal value during the measurement process must correspond to those indicated in Table. 3.
Table 3
3.1.3. It is not recommended to place measurement objects with a temperature deviation on the surface from normal by more than 1.5 in the working space; 2.5; 3.5, 5°C, respectively, for I-III; IV-VIII; IX-XI; XII-XIV rows. In this case, the exposure time in the working space at the temperature specified in clause 3.1.2, before the start of measurements, must be at least that indicated in Table. four.
Table 4
Note. If the surface temperature of the measurement objects placed in the working space exceeds the values specified in clause 3.1.3, the exposure time must be increased.
3.1.4. Measuring instruments must be in conditions that meet the requirements of clause 3.1.2, at least 24 hours before the start of measurements.
3.1.5. The limits of the non-stationary component of the temperature difference allowed during the measurement process at any two points and the temperature change at any point of the working space and the surfaces of the object and measuring instruments located in it must correspond to those indicated in Table. 5.
Only smooth temperature changes at a rate of not more than 0.1 ° s / min are allowed in the working space. Separate fluctuations with a period of less than 0.5 min are not taken into account.
Table 5
* Provided when the operator is located outside the workspace.
Note. The norms indicated in the table. 5, apply to the conditions for comparing measures and objects of measurement with a difference in linear expansion coefficients of not more than 7-10 _ in K ~ g with a total mass of means and objects of measurement of not more than 500 kg.
3.1.6. The frequency of disturbing harmonic vibrations acting on the means and the object of measurement should not exceed 30 Hz. The amplitude of disturbing vibrations in millimeters at a frequency of more than 1 Hz should not exceed the values determined by the dependence
V is the amplitude of the oscillation speed;
v is the reduced amplitude of the oscillation velocity;
f - vibration frequency, Hz.
At vibration frequencies less than 1 Hz, the vibration amplitude should not exceed the A values indicated in Table. 6.
When exposed to disturbing vibrations with the parameters of the spectral components that go beyond the normal limits, the fluctuation range of the reference index of the device and the additional error of the measuring instrument should not exceed the corresponding
venno 0.2 divisions of the scale and 0.2 permissible measurement error.
3.1.7. The ambient air pressure in the working space should not be less than atmospheric pressure. It is allowed to exceed the atmospheric pressure by no more than 3 kPa.
3.1.8. The amount of solid dust particles in 1m 3 of air in the working space should not exceed the values \u200b\u200bspecified in Table. 7.
Table 7
Note. The number of smaller particles for the corresponding series is not standardized, and the presence of larger particles is not allowed.
3.1.9. Limits of permissible deviation of air humidity in the working space from normal ± 20%.
With interference linear measurements corresponding to rows I-VI, the limits of permissible deviation of air humidity in the working space from normal ± 5%; the normal content of carbon dioxide is 0.03%.
It is allowed not to measure the actual content of carbon dioxide and increase the limits of the permissible deviation of humidity up to ± 10%, provided that during the measurement the refractive index of air is determined with an error D p not exceeding the values \u200b\u200bspecified in Table. eight.
Table 8
Dimensions, mm
Limit of permissible errors A for rows j
Note. The refractive index of normal air i n = 1.00027159 for the primary reference wavelength L n =605.61574 nm and p n = 1.00027259 for the secondary reference wavelength R n =546.07819 nm.
3.1.10. The highest air velocity in the working space should not exceed 0.1 m/s for measurements corresponding to rows I-VIII, and 0.2 m/s for measurements corresponding to rows IX-XIV.
3.1.11. The limits of illumination of the working space with general illumination are set in accordance with those indicated in Table. 9.
Table 9
3.1.12. The noise level in the working space should not exceed 45 dB for measurements corresponding to rows I-VIII, and 80 dB for measurements corresponding to rows IX-XIV.
3.1.13. The magnetic field strength should not exceed 80 A / m, the electrostatic field strength - 5 V / m.
3.1.14. The limits of the permissible amplitude of the magnetic field oscillations during the measurement process in the presence of unshielded electromagnetic transducers in the measuring instruments are 10 A/m.
3.1L5. The error of the measuring instrument, caused by contact deformations at the point of contact of the measuring tip with the measured object, should not exceed 0.1 of the permissible measurement error, which is ensured by the choice of material and shape of the measuring surfaces, the normalization of the measuring force and its fluctuations.
3.2. Normal limits for influence quantities in angular measurements
3.2.1. Limits of permissible deviations from the normal position of the plane for measuring angles and normalized parameters for the orientation of measuring instruments and objects:
±0.5° for 1st, 2nd degrees of accuracy;
±1.5° for 3rd-5th degrees of accuracy.
3.2.2. Limits of permissible deviation of the temperature of the object of measurement and the working space in the process of measurement from the normal value of ± 3.5 ° С.
3.2.3. The limits of the non-stationary component of the temperature difference allowed during the measurement process at any two points and the temperature change at any point of the working space of the surfaces of the object and measuring instruments must correspond to those indicated in Table. ten.
Only smooth temperature changes at a rate of not more than 0.2°C/min are allowed in the working space. Individual pulses shorter than 0.5 min are not taken into account.
Table 10
3.2.4. The frequency and amplitude of disturbing vibrations should
correspond to those specified in paragraph 3.1.6 at A = 0.01 mm, U = 0.01 mm / s - for 1, 2 degrees of accuracy and A = 0.03 mm,
y=0.03 mm/s - for 3rd-5th degrees of accuracy.
3.2.5. The deviation of air humidity in the working space from the normal value should not exceed ± 10% for measurements corresponding to 1-3 degrees of accuracy, and ± 25% - for measurements corresponding to 4, 5 degrees of accuracy.
3.2.6. The noise level in the working space should not exceed 55 dB when measured corresponding to 1, 2-n degrees
accuracy, and 80 dB - for measurements corresponding to 3-5 degrees of accuracy.
3.2.7. The highest speed of air movement in the working space should not exceed 0.1 m/s for measurements corresponding to the 1st-3rd degrees of accuracy, and 0.2 - for measurements corresponding to the 4th, 5th degrees of accuracy.
3.2.8. The normal limits and requirements for the normal range of other influence quantities must comply with the requirements of paragraphs. 3.1.7, 3.1.8 (for angles of the 1st, 2nd degree of accuracy along the IX-XI rows, for angles of the 3rd-5th degree of accuracy along the XII row), paragraphs. 3.1.11, 3.1.13, 3.1.14 and 3.1.15 of this standard.
APPENDIX 1 to GOST 8.050-73 Reference
DEFINITION OF THE MOST IMPORTANT CONCEPTS ENCOUNTERED
IN STANDARD
1. Normal limits of values of influencing quantities - limits of the normal range of values of influencing quantities, established regardless of the type of measuring instrument selected with the condition that the requirement of clause 2.2 (2.3) is met.
2. Working space - a part of the space surrounding the means and the object of measurement, outside of which the effect of influencing quantities on the measurement result can be neglected.
APPENDIX 2 to GOST 8M0-73 Reference
REQUIREMENTS FOR MEASUREMENT OBJECTS
1. The roughness of the surfaces, the dimensions of which are to be measured, should not be rougher than indicated in the table.
|
Surface cleanliness classes according to GOST 2789-59 |
Rows according to this standard |
Size range, mm |
|||
|
linear measurements |
measurements |
linear |
smaller side of the angle |
||
|
St. 32 to 120 |
|||||
Continuation
|
Surface cleanliness classes according to GOST 2789-69 |
Rows according to this standard |
size range, | ||||||||
|
linear measurements |
measurements |
linear |
smaller side of the angle |
|||||||
2. Deviations in the shape and location of the measured surfaces must comply with the requirements of GOST 10356-63.
APPENDIX 3 to GOST 8.050-73 Reference
ALLOWED VALUES bin. l FOR ISO CLASSIFICATIONS
When assigning tolerances for ISO qualifications, the output is bin. l of the actual value of the instrumental error (error of the measuring instrument) under normal conditions beyond the limit of the permissible basic error of the measuring instrument should not exceed the values \u200b\u200bspecified in the table.
|
Rows of limits of permissible values b tolerances for qualifications V | ||||||||||||
Continuation
|
Rows of limits of permissible values b, microns, for tolerances for ISO qualifications |
||||||||
|
Dimensions, mm | ||||||||
Group T80
Change No. 1 GOST 8.050-73 State system for ensuring the uniformity of measurements. Normal conditions for performing linear and angular measurements
By the Decree of the USSR State Committee for Standards dated 02.09.81 No. 4121, the introduction period was established
On the cover and on the first page, the designation of the standard shall be supplemented with the designation: (ST SEV 1155-78).
Introductory part. Rewrite the first paragraph:
“This standard establishes requirements for normal conditions for measuring lengths (linear dimensions) and angles (angular dimensions) *
add a paragraph
(Continued see f. 210) 8 Law. 2561 209
(Continuation of changes to GOST 8 050-73)
"The standard fully complies with ST SEV 1155-78."
Item 12. Change the value: 101324.72 Pa to 1G1325 Pa.
Clause 1.3. Change the value: 1333.22 Pa to 1333 Pa.
Paragraph 1 5 shall be reworded as follows:
“1.5. The direction of the line and plane of measurement of linear dimensions is horizontal (90 ° from the direction of gravity).
Paragraph 1.6 shall be supplemented with the words: "(90° from the direction of gravity)".
STATE STANDARD OF THE UNION OF THE SSR
STATE PROVISION SYSTEM
UNIT OF MEASUREMENTS
NORMAL PERFORMANCE CONDITIONS
LINEAR AND ANGULAR MEASUREMENTS
GOST 8.050-73
(st sev 1155-78)
STATE STANDARDS COMMITTEE
USSR COUNCIL OF MINISTERS
Moscow
(Revised edition, Rev. No. 1).
DEVELOPED AND INTRODUCED by the All-Union Research Institute of Metrology. DI. Mendeleev (VNIIM)
Director Arutyunov V.O.
Theme leader Zeitlin Ya.M.
Artists: Zeitlin Ya.M., Gofman I.A.
PREPARED FOR APPROVAL
Department of the machine-tool industry and intersectoral production of the State Committee of Standards of the Council of Ministers of the USSR
Head of Department Bergman V.P.
Art. engineer Lepid N.M.
All-Union Research Institute of the State Committee for Standards of the Council of Ministers of the USSR (VNIIGK)
Head of laboratory Bulatov S.B.
Head laboratory Eidinov V.Ya.
APPROVED by the State Committee for Standards of the Council of Ministers of the USSR on December 15, 1972 (Minutes No. 192)
Deputy chairman of the branch scientific and technical commission Bergman V.P.
Commission members: Dolyakov V.G., Zlatkovich L.A., Klimov G.N., Baranov N.N.
INTRODUCED BY Decree of the State Committee for Standards of the Council of Ministers of the USSR dated February 21, 1973 No. 425
STATE STANDARD OF THE UNION OF THE SSR
|
NORMAL PERFORMANCE CONDITIONS State system for ensuring the uniformity of |
GOST (st sev 1155-78) |
By the Decree of the State Committee for Standards of the Council of Ministers of the USSR dated November 21, 1973 No. 425, the validity period is established
from 01.01.1975
until 01.01.1985
(Revised edition, Rev. No. 1).
This International Standard specifies requirements for normal conditions for measuring lengths (linear dimensions) and angles (angular dimensions).
The requirements specified in this standard are recommended for use in the design, development and implementation of measurement processes for objects that do not have internal heat sources.
Normal conditions must be ensured during measurements in order to practically exclude additional errors.
The standard fully complies with ST SEV 1155-78.
(Revised edition, Rev. No. 1).
. NORMAL VALUES OF MAIN INFLUENCING QUANTITIES
|
Rows of limits of permissible values δ in. l, µm |
From v.1 to 3 |
» 120 » 180 |
Note. Tolerances of the measured values Δ l in microns, indicated in table. , correspond to:
from I to VIII series - tolerances for accuracy classes 02-09 according to GOST 11472-69;
|
Rows of limits of permissible values δ in. y for degrees of accuracy according to GOST 8908 -58 |
2" 00" |
3" 00" |
5" 00" |
1" 40" |
2" 30" |
4" 00" |
2" 00" |
3" 00" |
1" 40" |
2" 30" |
2" 00" |
1" 40" |
2" 30" |
2" 00" |
1" 40" |
|
