Some standard content:
National Metrology Technical Specification of the People's Republic of China JJF1207-—2008
Calibration Specification for Cylindrical Measuring Pin2008-06-06 Issued
Implementation on 2008-12-06
Issued by the General Administration of Quality Supervision, Inspection and Quarantine JJF1207—2008
Calibration Specification for Cylindrical Measuring Pin
JJF1207-—-2008
Replaces JJG41-1990
This specification was approved by the General Administration of Quality Supervision, Inspection and Quarantine on June 6, 2008, and came into effect on December 6, 2008.
Responsible unit: National Technical Committee for Geometry and Length Metrology Drafting unit: Shenzhen Metrology Quality Inspection Institute, China National Institute of Metrology
This specification is interpreted by the National Technical Committee for Geometry and Length Metrology Drafting person of this specification:
JJF1207--2008
Huang Yang (China National Institute of Metrology)
Gan Jiping (Shenzhen Metrology Quality Inspection Institute 2
Scope·
References·
Metrological characteristics·.
Calibration conditions…
5.1 Environmental conditions
Isothermal time·
5.3 Standard instruments and other equipment
5.4 Other conditions
Calibration items and calibration procedures Calibration method·
6.2 Straightness
6.3 Diameter and diameter variation..
Expression of calibration results·
Recalibration time interval
Appendix A Relevant metrological characteristics in product standards
Appendix B
Appendix C
Appendix D
JJF1207—2008
Corresponding relationship table of three-needle diameter and prism probeUncertainty requirements for diameter measurement results
Uncertainty evaluation record for three-needle diameter detection results
(2)
(2)
(3)
(5)
(6)
JJF1207-2008
Needle gauge, three-needle calibration Specification
This specification is applicable to the calibration of various needle gauges and three-needle gauges made of steel, cemented carbide, ceramics and other materials. References
The provisions contained in the following documents constitute the provisions of this specification through reference to this specification. When this specification is published, the versions shown are valid
All parties using this specification should explore the possibility of using the latest versions of the following documents JB/T3326-
JB/T10631
JJF1001
JJF1059
Needle gauges and tools generally use
the same three-needle gauge
4 Metrological characteristics
General metrological terms and definitions
Evaluation and expression of measurement uncertainty The pin gauge is a set of cylindrical measuring tools with a nominal diameter and is mostly arranged at certain size intervals.
Workpiece aperture inspection; standard pin gauges are mostly used for instrument calibration. Triple pins are usually used in groups, and three diameter HSnOH
are used to measure threads.
Pin gauges,
The style is shown in Figure 1.
BLISHIN
A Various types of round gauges BO titanium
Triple pins:
Handled pin gauges
According to the purpose of pin gauges and triple pins, the following metrological characteristics should be calibrated. Roundness;
Element straightness;
Diameter and diameter variation.
Note: The metrological characteristics specified in the relevant product standards are shown in Appendix A. 5 Calibration conditions
5.1 Environmental conditions
Temperature control range: (20±1)℃;
5.2 Isothermal time
JJF1207—2008
Under the calibration environmental conditions, the isothermal time shall not be less than 1 hour. 5.3 Standard instruments and other equipment
It is recommended to use the instruments listed in Table 1, and it is allowed to use other standards that meet the uncertainty requirements for calibration. Table 1 Standards and other equipment
Calibration items
Straightness
Diameter and diameter variation
5.4 Other conditions
Standards and other equipment
Optical gauge, hollow measuring cap and special measuring head, roundness gauge 4-level gauge block, 1-level flat crystal, 0-level knife edge ruler, grinding surface flat ruler, electric profiler length measuring machine, length measuring instrument, laser diameter gauge, 2-level and 3-level gauge blocks and comparator Before calibration, it should be confirmed that there are no appearance defects that affect the correct implementation of calibration and the calibration results. 6 Calibration items and calibration methods
6.1 Roundness
6.1.1 Roundness of three needles
6.1.1.1 Calibration can be performed on a horizontal optical gauge. First, install a special hollow measuring cap on the tail pipe (as shown in Figure 2), and then insert a prismatic measuring head with a V-shaped angle of 60° into the measuring cap hole (you can use a measuring head of a threaded micrometer or a specially made one, see Appendix B). Then install a narrow flat measuring head on the measuring rod of the optical meter, and make its long side perpendicular to the groove of the prismatic measuring head. After the two measuring heads are installed and adjusted, put the three needles between the two measuring heads so that the middle section of the working surface of the three needles contacts the measuring heads. Adjust the tail pipe of the instrument so that the indication of the optical meter is at zero or a certain scale near it. Rotate the three needles 360° around the axis and observe the change of the indication of the optical meter at the same time. The 1/3 of the difference between the maximum indication and the minimum indication is the roundness of the three needles. Figure 2 Hollow measuring cap
6.1.1.2 When calibrating on a vertical optical gauge, a special workbench with a fixed small shaft (as shown in Figure 3) is required. The workbench is placed on the workbench of the vertical optical gauge. The fixed small shaft of the special workbench is used to install the hollow measuring cap.
JJF1207-2008
Figure 3 Special workbench
6.1.1.3 The method for calibrating the roundness of three needles on a vertical optical gauge is the same as that of a horizontal optical gauge. 6.1.1.4 The roundness of three needles with a diameter greater than 1mm can be calibrated with a roundness meter. 6.1.2 Roundness of pin gauge
6.1.2.1 Calibrate the roundness at the two ends and the three middle sections of the working surface in the same way as the three needles. 6.1.2.2 The position of the measuring section of the pin gauge with handle is determined according to its working length. When the working length is less than or equal to 10mm, select a measurement section near the end; when the working length is greater than 10mm to 20mm, select 2 measurement sections at the end and the root; when the working length is greater than 20mm, select 3 measurement sections at the end, middle and root. 6.1.2.3 Take the maximum value of the evaluation results at each position as the roundness of the pin gauge being measured. 6.1.2.4 The roundness of the pin gauge with a diameter greater than 1mm can be calibrated with a roundness meter. 6.1.3 Roundness of the standard pin gauge
Calibrate with a roundness meter at the two ends and the three middle sections of the working surface, and take the maximum value of the evaluation results at each position as the roundness of the standard pin gauge being measured.
6.1.4 Reference circle center
When calibrating the roundness of the pin gauge and three pins with a roundness meter, the reference circle center for error evaluation shall be the least squares circle center or the minimum area circle center.
6.2 Straightness
6.2.1 Calibrate straightness using the light gap method
6.2.1.1 Use the working surface of a 4-level gauge block of about 20 mm as a standard to calibrate the straightness of the three-pin prime line. During calibration, place the middle part of the three-pin working surface in the horizontal position of the gauge block working surface, rotate the three needles to be measured 360° around the axis, observe the light gap, and determine the prime line straightness of the three needles by comparing with the standard light gap. 6.2.1.2 Use a ground flat ruler or gauge block as a standard to calibrate the prime line straightness of the entire length of the pin gauge or standard pin gauge. Rotate the pin gauge or standard pin gauge to be measured 360° around the axis, observe the light gap, and determine the prime line straightness of the pin gauge or standard pin gauge by comparing with the standard light gap. The standard light gap consists of a 4-level gauge block, a level 1 flat crystal, and a level 0 knife edge ruler. 6.2.2 Calibration of straightness with electric profiler
The electric profiler can be equipped with an axe-shaped probe to calibrate the straightness of the pin gauge and three-pin. During calibration, at least three element lines are selected for measurement, and the maximum value is taken as the straightness of the pin gauge and three-pin to be calibrated. 6.3 Diameter and diameter variation
6.3.1 The diameter and diameter variation are calibrated by direct measurement or comparative measurement. When selecting the measurement method, the uncertainty of the measurement result should be considered.
Note: The recommended uncertainty requirements are shown in Appendix C. 6.3.2 Diameter and diameter variation of three-pin
6.3.2.1 Direct calibration with a length measuring machine
JJF1207-2008
When using a length measuring machine to directly calibrate the diameter of the three needles, horizontally install narrow flat probes on the headstock and tailstock measuring rods of the length measuring machine, adjust the parallelism and zero position of the probes, move the length measuring machine, place the three needles to be measured between the two probes, measure the diameter of the middle section, and read the value from the length measuring machine. Rotate the three needles to be measured 90° around the axis, measure the second value on the middle section, and the average of the two readings is the diameter of the three needles. If possible, the indication error of the length measuring machine should be corrected. 6.3.2.2 Calibration with a laser diameter gauge
When using a laser diameter gauge to directly calibrate the three needles, place the three needles on the instrument's √-shaped frame, align the middle section with the laser line, press the measurement key, and read the second value. Rotate the three needles to be measured around the axis
and measure the second value. The average of the two readings is the diameter of the three needles. 90°, measure the second value on the middle section, 007
Instrument calibration
6.3.2.3 Use gauge blocks and comparator to calibrate three needles. When using gauge blocks and comparator, 1 first install the narrow plane probe horizontally on the comparator, adjust the parallelism of the probe, then select a gauge block of appropriate size and place the gauge block!
The long sides of the probes are in the same direction
Adjust the zero position, then place the three needles to be measured between the two probes, and read the difference
from the comparator. The average value of the measured three needles rotated 90 degrees around the axis
and the algebraic sum of the gauge block is the diameter of the three needles. When the diameter of the three needles is smaller than
(the long side of the gauge block and
measure the cross-sectional diameter,
measure the second value on the cross-sectional area, and read
1mm twice), it can be combined with an appropriate gauge block, and then use a gauge block close to the combined size to refer to the following formula:
Comparison. Combination principle
By+combination gauge block)
Zero gauge block one (three needle diameter
For example, use a 1.2mm gauge block to zero, and compare the 0.201
three needles with the 1mm
comparator measurement range| |tt|| gauge block combination, read the difference
value on the comparator. For example, use the 1.3 gauge block to zero, and read the difference by combining the 0.796mm three-needle and 0.5mm gauge block.
6.3.2.4 Use the same method to
measure the two mutually perpendicular
diameter values on the two sections
mm near the middle section of the needle on the comparator, together with the two values of the middle section, take the difference between the maximum and minimum values as the diameter variation 6.3.3 The diameter and diameter variation of the needle gauge
The same method is used to calibrate the
diameters of the two perpendicular
sections of the middle section, respectively measure the two ends of the needle gauge and 6.3.3.1 Use the same method as the three-needle straight
two diameters, and take the maximum value as the diameter of the needle gauge 6.3.3.2 The needle gauge with handle measures the position of the section and uses it as the calibration Quick determination. When the working length is less than or equal to 10mm
, select a measuring section near the end; when the working length is about 10mm to 20mm, select 2 measuring sections at the end and the root; when the working length is greater than 20mm, select 3 measuring sections at the end, middle and root. Using the same method as the three-needle diameter calibration, measure two mutually perpendicular diameters at each measured section of the needle gauge, and take the maximum value as the diameter of the needle gauge.
6.3.3.3 Take the difference between the maximum and minimum values of the above measurement results as the diameter variation of the needle gauge 6.3.4 Diameter of the standard pin gauge
Use the method of comparing with two equal blocks to measure the two mutually perpendicular diameters at the two ends and the middle section of the needle gauge respectively, and take the average of the two results of each section as the diameter of the standard pin gauge section. 4
Expression of calibration results
JJF1207—2008
A calibration certificate is issued for calibrated needle gauges and three-needle gauges. The certificate should include at least the following information: a) Title: Calibration Certificate;
b) Name and address of the laboratory;
c) Unique identification of the calibration certificate (such as serial number) and identification on each page to ensure that the page can be identified as part of the calibration certificate, as well as a clear identification indicating the end of the calibration certificate; NIS
|d) Name and address of the customer;
f Description of the calibrated instrument and clear identification; g) Calibration date;
A schematic diagram of the measuring section and position of the standard gauge should be given; h) Signatures of the person who checked and approved the calibration result;
i) Calibrator,
ji) Environmental conditions
1) Evidence of traceability.
Recalibration time interval
Recalibration time
The interval can be determined by the user, and it is recommended not to exceed the operating year
METROL
UBLISHING HOUSE
Appendix A
A.1 Metrological characteristics of needle gauges
JJF1207-2008
Relevant metrological characteristics in product standards
The metrological characteristics of needle gauges are quoted from Article 5.6 of JB/T10631--2006 "Needle Gauges". See Table A.1. Table A.1 Metrological characteristics of needle gauges
Nominal value d
>6~10
>10~25
Limit deviation of any diameter
Note: The values in the table should be the corresponding values at 20℃. A.2 Metrological characteristics of three needles
Diameter variation and roundness
Element straightness
Grade 0, 1, 2
The metrological characteristics of the three needles are quoted from Article 4.3 of JB/T3326-1999 "Measuring needles", see Table A.2. Table A.2 Metrological characteristics of three needles
Accuracy level
Nominal diameter D/mm
0.118~6.212
Dimension deviation/μm
Roundness tolerance A/μm
Taper tolerance
Within the
deviation range of diameter D
Directional straightness tolerance B
On a length of 8mm
Not more than 1μm
Directional straightness tolerance is not taken into account.
Note: Within the range of 1mm from the edge of the measuring surface, the roundness tolerance, taper tolerance, Note: The contents of this appendix are for reference only.
Appendix B
Three-pin nominal diameter
JJF1207—2008
Three-pin diameter and prism probe corresponding relationship table Table B.1 Three-pin diameter and prism probe corresponding relationship Probe size
(marked on the tail handle)
Specially manufactured
M1.75~2.5
M1.75~2.5 or T2
M1.75~2.5
M3~4.5 or T
Three-pin nominal diameter||t t||Probe size
(marked on the tail handle)
M3~4.5 or Ts
M5~6 or Ts
Specially manufactured
Specially manufactured or T:
Specially manufactured
Appendix C
JJF1207-2008
Uncertainty requirements for diameter measurement results
C.1 Uncertainty requirements for measurement results
The uncertainty requirements for diameter measurement results of recommended pin gauges and three-pin gauges are shown in Table C.1. Table C.1 Uncertainty requirements for diameter measurement results Type
Nominal value/mm
Standard pin gauge
Note: Contains factor Shop
Degree of certainty/μm
URLISING HOUSE
METROLOGY3 Use gauge blocks and comparator to calibrate three needles. When using gauge blocks and comparator 1. First install the narrow plane probe horizontally on the comparator, adjust the parallelism of the probe, and then select a gauge block of appropriate size and place the gauge block!
The long sides of the probes are in the same direction
Adjust the zero position, then place the three needles to be measured between the two probes, and read the difference
from the comparator. The average value of the measured three needles rotated 90 degrees around the axis
and the algebraic sum of the gauge block is the diameter of the three needles. When the diameter of the three needles is smaller than
(the long side of the gauge block and
measure the cross-sectional diameter,
measure the second value on the cross-sectional area, and read
1mm twice), it can be combined with an appropriate gauge block, and then use a gauge block close to the combined size to refer to the following formula:
Comparison. Combination principle
By+combination gauge block)
Zero gauge block one (three needle diameter
For example, use a 1.2mm gauge block to zero, and compare the 0.201
three needles with the 1mm
comparator measurement range| |tt|| gauge block combination, read the difference
value on the comparator. For example, use the 1.3 gauge block to zero, and read the difference by combining the 0.796mm three-needle and 0.5mm gauge block.
6.3.2.4 Use the same method to
measure the two mutually perpendicular
diameter values on the two sections
mm near the middle section of the needle on the comparator, together with the two values of the middle section, take the difference between the maximum and minimum values as the diameter variation 6.3.3 The diameter and diameter variation of the needle gauge
The same method is used to calibrate the
diameters of the two perpendicular
sections of the middle section, respectively measure the two ends of the needle gauge and 6.3.3.1 Use the same method as the three-needle straight
two diameters, and take the maximum value as the diameter of the needle gauge 6.3.3.2 The needle gauge with handle measures the position of the section and uses it as the calibration Quick determination. When the working length is less than or equal to 10mm
, select a measuring section near the end; when the working length is about 10mm to 20mm, select 2 measuring sections at the end and the root; when the working length is greater than 20mm, select 3 measuring sections at the end, middle and root. Using the same method as the three-needle diameter calibration, measure two mutually perpendicular diameters at each measured section of the needle gauge, and take the maximum value as the diameter of the needle gauge.
6.3.3.3 Take the difference between the maximum and minimum values of the above measurement results as the diameter variation of the needle gauge 6.3.4 Diameter of the standard pin gauge
Use the method of comparing with two equal blocks to measure the two mutually perpendicular diameters at the two ends and the middle section of the needle gauge respectively, and take the average of the two results of each section as the diameter of the standard pin gauge section. 4
Expression of calibration results
JJF1207—2008
A calibration certificate is issued for calibrated needle gauges and three-needle gauges. The certificate should include at least the following information: a) Title: Calibration Certificate;
b) Name and address of the laboratory;
c) Unique identification of the calibration certificate (such as serial number) and identification on each page to ensure that the page can be identified as part of the calibration certificate, as well as a clear identification indicating the end of the calibration certificate; NIS
|d) Name and address of the customer;
f Description of the calibrated instrument and clear identification; g) Calibration date;
A schematic diagram of the measuring section and position of the standard gauge should be given; h) Signatures of the person who checked and approved the calibration result;
i) Calibrator,
ji) Environmental conditions
1) Evidence of traceability.
Recalibration time interval
Recalibration time
The interval can be determined by the user, and it is recommended not to exceed the operating year
METROL
UBLISHING HOUSE
Appendix A
A.1 Metrological characteristics of needle gauges
JJF1207-2008
Relevant metrological characteristics in product standards
The metrological characteristics of needle gauges are quoted from Article 5.6 of JB/T10631--2006 "Needle Gauges". See Table A.1. Table A.1 Metrological characteristics of needle gauges
Nominal value d
>6~10
>10~25
Limit deviation of any diameter
Note: The values in the table should be the corresponding values at 20℃. A.2 Metrological characteristics of three needles
Diameter variation and roundness
Element straightness
Grade 0, 1, 2
The metrological characteristics of the three needles are quoted from Article 4.3 of JB/T3326-1999 "Measuring needles", see Table A.2. Table A.2 Metrological characteristics of three needles
Accuracy level
Nominal diameter D/mm
0.118~6.212
Dimension deviation/μm
Roundness tolerance A/μm
Taper tolerance
Within the
deviation range of diameter D
Directional straightness tolerance B
On a length of 8mm
Not more than 1μm
Directional straightness tolerance is not taken into account.
Note: Within the range of 1mm from the edge of the measuring surface, the roundness tolerance, taper tolerance, Note: The contents of this appendix are for reference only.
Appendix B
Three-pin nominal diameter
JJF1207—2008
Three-pin diameter and prism probe corresponding relationship table Table B.1 Three-pin diameter and prism probe corresponding relationship Probe size
(marked on the tail handle)
Specially manufactured
M1.75~2.5
M1.75~2.5 or T2
M1.75~2.5
M3~4.5 or T
Three-pin nominal diameter||t t||Probe size
(marked on the tail handle)
M3~4.5 or Ts
M5~6 or Ts
Specially manufactured
Specially manufactured or T:
Specially manufactured
Appendix C
JJF1207-2008
Uncertainty requirements for diameter measurement results
C.1 Uncertainty requirements for measurement results
The uncertainty requirements for diameter measurement results of recommended pin gauges and three-pin gauges are shown in Table C.1. Table C.1 Uncertainty requirements for diameter measurement results Type
Nominal value/mm
Standard pin gauge
Note: Contains factor Shop
Degree of certainty/μm
URLISING HOUSE
METROLOGY3 Use gauge blocks and comparator to calibrate three needles. When using gauge blocks and comparator 1. First install the narrow plane probe horizontally on the comparator, adjust the parallelism of the probe, and then select a gauge block of appropriate size and place the gauge block!
The long sides of the probes are in the same direction
Adjust the zero position, then place the three needles to be measured between the two probes, and read the difference
from the comparator. The average value of the measured three needles rotated 90 degrees around the axis
and the algebraic sum of the gauge block is the diameter of the three needles. When the diameter of the three needles is smaller than
(the long side of the gauge block and
measure the cross-sectional diameter,
measure the second value on the cross-sectional area, and read
1mm twice), it can be combined with an appropriate gauge block, and then use a gauge block close to the combined size to refer to the following formula:
Comparison. Combination principle
By+combination gauge block)
Zero gauge block one (three needle diameter
For example, use a 1.2mm gauge block to zero, and compare the 0.201
three needles with the 1mm
comparator measurement range| |tt|| gauge block combination, read the difference
value on the comparator. For example, use the 1.3 gauge block to zero, and read the difference by combining the 0.796mm three-needle and 0.5mm gauge block.
6.3.2.4 Use the same method to
measure the two mutually perpendicular
diameter values on the two sections
mm near the middle section of the needle on the comparator, together with the two values of the middle section, take the difference between the maximum and minimum values as the diameter variation 6.3.3 The diameter and diameter variation of the needle gauge
The same method is used to calibrate the
diameters of the two perpendicular
sections of the middle section, respectively measure the two ends of the needle gauge and 6.3.3.1 Use the same method as the three-needle straight
two diameters, and take the maximum value as the diameter of the needle gauge 6.3.3.2 The needle gauge with handle measures the position of the section and uses it as the calibration Quick determination. When the working length is less than or equal to 10mm
, select a measuring section near the end; when the working length is about 10mm to 20mm, select 2 measuring sections at the end and the root; when the working length is greater than 20mm, select 3 measuring sections at the end, middle and root. Using the same method as the three-needle diameter calibration, measure two mutually perpendicular diameters at each measured section of the needle gauge, and take the maximum value as the diameter of the needle gauge.
6.3.3.3 Take the difference between the maximum and minimum values of the above measurement results as the diameter variation of the needle gauge 6.3.4 Diameter of the standard pin gauge
Use the method of comparing with two equal blocks to measure the two mutually perpendicular diameters at the two ends and the middle section of the needle gauge respectively, and take the average of the two results of each section as the diameter of the standard pin gauge section. 4
Expression of calibration results
JJF1207—2008
A calibration certificate is issued for calibrated needle gauges and three-needle gauges. The certificate should include at least the following information: a) Title: Calibration Certificate;
b) Name and address of the laboratory;
c) Unique identification of the calibration certificate (such as serial number) and identification on each page to ensure that the page can be identified as part of the calibration certificate, as well as a clear identification indicating the end of the calibration certificate; NIS
|d) Name and address of the customer;
f Description of the calibrated instrument and clear identification; g) Calibration date;
A schematic diagram of the measuring section and position of the standard gauge should be given; h) Signatures of the person who checked and approved the calibration result;
i) Calibrator,
ji) Environmental conditions
1) Evidence of traceability.
Recalibration time interval
Recalibration time
The interval can be determined by the user, and it is recommended not to exceed the operating year
METROL
UBLISHING HOUSE
Appendix A
A.1 Metrological characteristics of needle gauges
JJF1207-2008
Relevant metrological characteristics in product standards
The metrological characteristics of needle gauges are quoted from Article 5.6 of JB/T10631--2006 "Needle Gauges". See Table A.1. Table A.1 Metrological characteristics of needle gauges
Nominal value d
>6~10
>10~25
Limit deviation of any diameter
Note: The values in the table should be the corresponding values at 20℃. A.2 Metrological characteristics of three needles
Diameter variation and roundness
Element straightness
Grade 0, 1, 2
The metrological characteristics of the three needles are quoted from Article 4.3 of JB/T3326-1999 "Measuring needles", see Table A.2. Table A.2 Metrological characteristics of three needles
Accuracy level
Nominal diameter D/mm
0.118~6.212
Dimension deviation/μm
Roundness tolerance A/μm
Taper tolerance
Within the
deviation range of diameter D
Directional straightness tolerance B
On a length of 8mm
Not more than 1μmbzxZ.net
Directional straightness tolerance is not taken into account.
Note: Within the range of 1mm from the edge of the measuring surface, the roundness tolerance, taper tolerance, Note: The contents of this appendix are for reference only.
Appendix B
Three-pin nominal diameter
JJF1207—2008
Three-pin diameter and prism probe corresponding relationship table Table B.1 Three-pin diameter and prism probe corresponding relationship Probe size
(marked on the tail handle)
Specially manufactured
M1.75~2.5
M1.75~2.5 or T2
M1.75~2.5
M3~4.5 or T
Three-pin nominal diameter||t t||Probe size
(marked on the tail handle)
M3~4.5 or Ts
M5~6 or Ts
Specially manufactured
Specially manufactured or T:
Specially manufactured
Appendix C
JJF1207-2008
Uncertainty requirements for diameter measurement results
C.1 Uncertainty requirements for measurement results
The uncertainty requirements for diameter measurement results of recommended pin gauges and three-pin gauges are shown in Table C.1. Table C.1 Uncertainty requirements for diameter measurement results Type
Nominal value/mm
Standard pin gauge
Note: Contains factor Shop
Degree of certainty/μm
URLISING HOUSE
METROLOGY3 Take the difference between the maximum and minimum values of the above measurement results as the diameter variation of the pin gauge. 6.3.4 Diameter of the standard pin gauge
Use the method of comparing with two equal blocks to measure the two diameters perpendicular to each other at the two ends and the middle section of the pin gauge respectively, and take the average of the two results of each section as the diameter of the standard pin gauge section. 4
Expression of calibration results
JJF1207—2008
A calibration certificate shall be issued for the calibrated needle gauge and three-needle gauge. The certificate shall include at least the following information: a) Title: Calibration Certificate;
b) Name and address of the laboratory;
c) Unique identification of the calibration certificate (such as serial number) and identification on each page to ensure that the page can be identified as part of the calibration certificate, as well as a clear identification indicating the end of the calibration certificate; NIS
d) Name and address of the customer;
f Description of the calibrated instrument and clear identification; g) Calibration date;
A schematic diagram of the measuring section and position of the standard gauge shall be given; h) Signatures of the person who checked and approved the calibration results;
i) Calibrator,
ji) Environmental conditions
1) Evidence of traceability.
Recalibration time interval
Recalibration time
The interval can be determined by the user, and it is recommended not to exceed the operating year
METROL
UBLISHING HOUSE
Appendix A
A.1 Metrological characteristics of needle gauges
JJF1207-2008
Relevant metrological characteristics in product standards
The metrological characteristics of needle gauges are quoted from Article 5.6 of JB/T10631--2006 "Needle Gauges". See Table A.1. Table A.1 Metrological characteristics of needle gauges
Nominal value d
>6~10
>10~25
Limit deviation of any diameter
Note: The values in the table should be the corresponding values at 20℃. A.2 Metrological characteristics of three needles
Diameter variation and roundness
Element straightness
Grade 0, 1, 2
The metrological characteristics of the three needles are quoted from Article 4.3 of JB/T3326-1999 "Measuring needles", see Table A.2. Table A.2 Metrological characteristics of three needles
Accuracy level
Nominal diameter D/mm
0.118~6.212
Dimension deviation/μm
Roundness tolerance A/μm
Taper tolerance
Within the
deviation range of diameter D
Directional straightness tolerance B
On a length of 8mm
Not more than 1μm
Directional straightness tolerance is not taken into account.
Note: Within the range of 1mm from the edge of the measuring surface, the roundness tolerance, taper tolerance, Note: The contents of this appendix are for reference only.
Appendix B
Three-pin nominal diameter
JJF1207—2008
Three-pin diameter and prism probe corresponding relationship table Table B.1 Three-pin diameter and prism probe corresponding relationship Probe size
(marked on the tail handle)
Specially manufactured
M1.75~2.5
M1.75~2.5 or T2
M1.75~2.5
M3~4.5 or T
Three-pin nominal diameter||t t||Probe size
(marked on the tail handle)
M3~4.5 or Ts
M5~6 or Ts
Specially manufactured
Specially manufactured or T:
Specially manufactured
Appendix C
JJF1207-2008
Uncertainty requirements for diameter measurement results
C.1 Uncertainty requirements for measurement results
The uncertainty requirements for diameter measurement results of recommended pin gauges and three-pin gauges are shown in Table C.1. Table C.1 Uncertainty requirements for diameter measurement results Type
Nominal value/mm
Standard pin gauge
Note: Contains factor Shop
Degree of certainty/μm
URLISING HOUSE
METROLOGY3 Take the difference between the maximum and minimum values of the above measurement results as the diameter variation of the pin gauge. 6.3.4 Diameter of the standard pin gauge
Use the method of comparing with two equal blocks to measure the two diameters perpendicular to each other at the two ends and the middle section of the pin gauge respectively, and take the average of the two results of each section as the diameter of the standard pin gauge section. 4
Expression of calibration results
JJF1207—2008
A calibration certificate shall be issued for the calibrated needle gauge and three-needle gauge. The certificate shall include at least the following information: a) Title: Calibration Certificate;
b) Name and address of the laboratory;
c) Unique identification of the calibration certificate (such as serial number) and identification on each page to ensure that the page can be identified as part of the calibration certificate, as well as a clear identification indicating the end of the calibration certificate; NIS
d) Name and address of the customer;
f Description of the calibrated instrument and clear identification; g) Calibration date;
A schematic diagram of the measuring section and position of the standard gauge shall be given; h) Signatures of the person who checked and approved the calibration results;
i) Calibrator,
ji) Environmental conditions
1) Evidence of traceability.
Recalibration time interval
Recalibration time
The interval can be determined by the user, and it is recommended not to exceed the operating year
METROL
UBLISHING HOUSE
Appendix A
A.1 Metrological characteristics of needle gauges
JJF1207-2008
Relevant metrological characteristics in product standards
The metrological characteristics of needle gauges are quoted from Article 5.6 of JB/T10631--2006 "Needle Gauges". See Table A.1. Table A.1 Metrological characteristics of needle gauges
Nominal value d
>6~10
>10~25
Limit deviation of any diameter
Note: The values in the table should be the corresponding values at 20℃. A.2 Metrological characteristics of three needles
Diameter variation and roundness
Element straightness
Grade 0, 1, 2
The metrological characteristics of the three needles are quoted from Article 4.3 of JB/T3326-1999 "Measuring needles", see Table A.2. Table A.2 Metrological characteristics of three needles
Accuracy level
Nominal diameter D/mm
0.118~6.212
Dimension deviation/μm
Roundness tolerance A/μm
Taper tolerance
Within the
deviation range of diameter D
Directional straightness tolerance B
On a length of 8mm
Not more than 1μm
Directional straightness tolerance is not taken into account.
Note: Within the range of 1mm from the edge of the measuring surface, the roundness tolerance, taper tolerance, Note: The contents of this appendix are for reference only.
Appendix B
Three-pin nominal diameter
JJF1207—2008
Three-pin diameter and prism probe corresponding relationship table Table B.1 Three-pin diameter and prism probe corresponding relationship Probe size
(marked on the tail handle)
Specially manufactured
M1.75~2.5
M1.75~2.5 or T2
M1.75~2.5
M3~4.5 or T
Three-pin nominal diameter||t t||Probe size
(marked on the tail handle)
M3~4.5 or Ts
M5~6 or Ts
Specially manufactured
Specially manufactured or T:
Specially manufactured
Appendix C
JJF1207-2008
Uncertainty requirements for diameter measurement results
C.1 Uncertainty requirements for measurement results
The uncertainty requirements for diameter measurement results of recommended pin gauges and three-pin gauges are shown in Table C.1. Table C.1 Uncertainty requirements for diameter measurement results Type
Nominal value/mm
Standard pin gauge
Note: Contains factor Shop
Degree of certainty/μm
URLISING HOUSE
METROLOGY
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