This standard applies to the calibration of three-needle with a diameter of φ0.118～6.585mm, which is newly manufactured and in use. JJG 41-1990 Three-needle calibration procedure JJG41-1990 Standard download decompression password: www.bzxz.net
This standard applies to the calibration of three-needle with a diameter of φ0.118～6.585mm, which is newly manufactured and in use.

National Verification Regulations of the People's Republic of China JJG 47-90
Approved on September 24, 1990
Implementation on March 1, 1991
State Administration of Technical Supervision
Three-needle Verification Regulations
V,R,af Through Measurement WirosJG 41
Agency G41-
This verification regulation was approved by the State Administration of Technical Supervision on September 24, 109, and has been in effect since March 1, 1991,
Responsible units: Liaoning Provincial Technical Supervision Higher Education
Translation unit, Liaoning Inspection and Testing Technology Research Institute This regulation is exempted from interpretation, and is the main author of this regulation.
Three jade standards
(Ningmi meter stock test technology research institute)
(Liaoning door scale test technology solution) "Ningmi meter stock test technology research institute
stable items and test conditions
technical level test method.
Test comprehensive treatment...
Blue needle test procedures
welcome to apply the new standard and make the two send for 0.118~585m three needle setting,
a shake description
three needles I come out of the standard you return to the uniform slow needle group spring group in the shape of a melon plate, in the actual half of the measurement outside the middle order. According to the common structure form, it is divided into I, positive, sub-type, as shown in 1, 2, and 3,
Figure 2 type with needle
a total of 1 2nd positive
Figure 1 is the nominal point diameter. 18-572mm
J3G41—90
Figure 2 is the gauge with a nominal diameter w0.7241.553mmFigure 3 is the outer diameter D of 1.732~6.585mm3
Calibration items milk calibration rate parts
The items to be adjusted in the next month are listed in Table 1, Table 1| |tt||, the form tells the school to design and supervise the secretion position
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2,1 risk of the internal and 2-6.
7 page 3 yuan
22 before the inspection will be three strands of final determination of its indoor flat temperature before the time is not less! 4h
Three technical requirements and verification methods
3 External climbing
3, 1 Requirements: The workpiece of the new three-point needle should be polished and not rusted. The three-point needle in use should not have any defects that affect the accuracy. The number plate of the new three-point needle should be straight and light, the accuracy level and the name of the manufacturer (or factory standard
, 3 Verification method, daily observation rate. If necessary, you can also put a mirror to observe, 4 pictures
4.1 Requirements: The zero circle should not be greater than 0.25m, and the return of the first-level three-point needle should not be less than .sm
4.2 Verification method, use horizontal Or vertical optical meter calibration, on the Peng type optical meter, first install a special center measuring flag on the display plate (as shown in Figure 4), and then insert a calibration pull head with a 60* angle in the tidal hole (the plug of the threaded micrometer can be used or specially made), and then stand on the two upper and lower surfaces of the optical meter to get the report, and make its long side and the quick-set head fall vertically, after the test of the data and the helper head, put one pin into the press-type plug and align it with the fixed plane, and make the middle of the two pins touch the measuring point, refer to Figure 4
total point member
JTG41-90
information science, partner optics let show a The degree is calculated with the dishes, six calculations, each three needles are controlled together, and the meter is read according to the North School training. The 1/3 of the difference between the maximum and the small display is found as the Haiguo point. In the optical calibration, a special workbench with a small gear is equipped (as shown in Figure 5). The workbench is placed on the vertical optical meter. It is used to install the hollow measuring instrument. The calibration method and teaching principle on the vertical mechanics are the same as the horizontal optical card meter calibration standard. The three meters with a diameter of 40.724nm can be measured in the above Figure 5. The straightness of the 5th meter can be obtained. 1 half: for the opponent color large lower middle 1.855mm three needle, its generatrix straightness tolerance is not greater than 1 in 8rr length charge,
5.2 according to the determination and output: three plan Dan shallow straight over class and with small 20mm four-grade disk fast with standard push light comparison method to deal with the capital
when the trend, will put the standard measuring block to make the long time pull on, will turn the three needles Chu, too light stock is not suitable for 1
for small 0514 three years, but the two are not pet, center and diameter
J5G41-9
8.1 accept the demand, three medicine industry line pot benefit room support 22
the 5th goods
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G, the second test is to place: horizontal optical meter or contact optical meter or sand only with three-grade salt comparison test.
For the three needles with a diameter of 17mm, the optical comparison test can be carried out. The scale error of the optical meter must be adjusted. For the needles with diameters of 0.201, 40.260 and 0.291mm, they can be combined with 1m blocks. For the three needles with diameters of 0.724 and 0.796r, they can be combined with the forbidden items. After that, the scale or 1 meter block is compared and tested.
When calibrating on the horizontal optical meter, a narrow plane should be installed on the measuring support of the optical tube. Its long position should be in a flat position, and the two measuring working surfaces should be adjusted to parallel with the end pins of the tube radial adjustment. The three needles are placed vertically. The front measuring block shall be used for the assembly, and its long side shall be in the horizontal position. The three-pin diameter shall be measured on three planes, the middle of the working part and 1.5 from the side. Each plane shall be measured at least in two vertical directions. The accuracy shall not exceed the allowable value of vertical difference. The actual size of the three-pin diameter shall be determined by the average of the middle diameter position. The three-pin true diameter shall be determined on the vertical code-type instrument according to the timing. The workbench (6-month period) shall be equipped. The position is the same as described above. North 7 Page 6
Four treatment of the test results
JJG4-90
? After the calibration, the company will issue a calibration certificate for the three products that are of small length to small length. If the product does not meet the requirements, it will issue a calibration result notice. For the products that are in use, the blind diameter position difference exceeds the requirements, but does not exceed -2,UI. It is allowed to continue to be used according to the actual situation, and the calibration certificate will be used to prove that the product is in use at the same time. JSG4190
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