This regulation applies to the initial verification, subsequent verification and in-use inspection of Morse and metric, 7:24 and drill clamp gauges. JJG 177-2003 Taper Gauge JJG177-2003 Standard download decompression password: www.bzxz.net
This regulation applies to the initial verification, subsequent verification and in-use inspection of Morse and metric, 7:24 and drill clamp gauges.

National Metrology Verification Regulation of the People's Republic of China JJG177—2003
Taper Gauges
Promulgated on March 5, 2003
Implementation on September 1, 2003
Promulgated by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China JJG177—2003
Verification Regulation of
Taper Gauges
JJG177—2003
Replaces JJG177—1993
This regulation was approved by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China on March 5, 2003, and came into effect on September 1, 2003.
Responsible unit: National Technical Committee for Geometric and Angle Metrology Main drafting unit: Liaoning Institute of Metrology, China Institute of Metrology
This regulation is interpreted by the National Technical Committee for Geometric and Angle Metrology Main drafter of this regulation:
Shi Zuode
Participating drafter:
JJG177—2003
(Liaoning Institute of Metrology)
(Liaoning Institute of Metrology )
(China National Institute of Metrology)
(Liaoning Institute of Metrology)
(China National Institute of Metrology)
Scope·
References·
Overview·
Metrological performance requirements·
Surface hardness of gauge working surface
Surface roughness of gauge working surface
Plug gauge shape tolerance
Plug gauge cone angle error
Plug gauge size.
Line width,
Ring gauge size
Matching size of plug gauge and ring gauge
Contact ratio of plug gauge and ring gauge…
General technical requirements…
6 Control of measuring instruments
Verification conditions
Verification items·
Verification methods
Processing of verification results
Verification cycle
Appendix A||t t||Verification of coating thickness and coating preparation
Appendix B
Format of the inner page of the verification certificate
JJG177—2003
(3)
1 Scope
JJG177—2003
Verification procedure for cone gauges
This procedure applies to the initial verification, subsequent verification and in-service inspection of Mohs and metric, 7:24 and drill clamp gauges. 2 References
GB/T11853~11855—1989 Cone gauge JJG2002—1987
Cone gauge taper measuring instrument verification system General metrological terms and definitions
JJG1001—1998
Evaluation and expression of measurement uncertainty
JJF1059—1999
Batch inspection counting sampling procedures and sampling tables GB2828—1987
When using this procedure, attention should be paid to using the current valid versions of the above references. 3 Overview
Cone gauge is a measuring tool that uses an inner and outer cone to match the entity and realizes the inspection of the cone angle and cone diameter of the corresponding cone matching workpiece. Cone gauges are divided into plug gauges and ring gauges: widely used in the machining industry. According to the use requirements:
Standard taper gauges (plug gauges) are divided into first and second grades; - Proofing gauges (plug gauges) used to check working ring gauges are divided into 1st, 2nd and 3rd grades; - Working gauges (plug gauges and ring gauges) for checking the taper tolerance grade of workpieces AT3 to AT8 are divided into 1st, 2nd and 3rd grades.
The types of taper gauges are
-Morse and metric taper gauges (divided into type A and type B, type B is only used to check the taper size of the workpiece); 7:24 tool taper gauges (divided into type A and type C); drill clamp taper gauges.
The commonly used types are shown in Figures 1, 2, 3, 4 and 5. 0
Figure 1 Mohs and Metric Type A
JJG177—2003
Figure 2 Mohs and Metric Type B
Figure 37: 24A Type
Figure 47: 24C Type
4 Metrological Performance Requirements
4.1 Surface Hardness of Gauge Working Surface
JJG177—2003
District District District District District District District District District
Figure 5 Drill Clamp
, second-class and 1, 2-level gauges shall not be less than 60HRC, and 3-level gauges shall not be less than 58HRC. 4.2 Surface Roughness of Gauge Working Surface
The surface roughness R of the working surface shall be less than that specified in Table 1. Table 1 Surface roughness R of working surface,
Gauge type
Conical plug gauge
Conical ring gauge
Second grade, 1
Plug gauge shape tolerance
Accuracy grade
Second grade, 2
Gauge for checking the cone
diameter of workpiece
The shape tolerance includes the straightness tolerance of the element line in any axial section and the roundness tolerance in any cross section, that is, the tolerance of the two is not greater than the provisions of Table 2.
Table 2 Form Tolerance
Accuracy
Accuracy Grade
Plug Gauge Cone Angle Error
JJG177—2003
Table 2 (Continued)
Morse Short Taper
Jagger Taper
123363
Standard Plug Gauge Cone Angle is measured according to the actual cone angle, and its measurement uncertainty should not exceed the provisions of Table 3. Table 3 Cone Angle Measuring Disc Uncertainty
Standard Plug Gauge
—Measurement length, mm.
Note: Lp
Measurement Uncertainty
U, (0.3+10/Lp)\×4.85×Lp×10-3U#(0.2+U)
The maximum allowable error of the cone angle of the calibration plug gauge shall not exceed the provisions of Table 4. Maximum allowable error of the cone angle of the calibration gauge
Accuracy grade
μurad
+40.0+31.5
ATorum
prad+100.0+80.0
ATorμm
+21.0+17.0
+2.5+3.0+2.5
+2.0+2.4+2.2+2.8
+6.0+5.5+7.0
Accuracy grade
μurad
μurad
ATpel μm
Cone accuracy level
μurad
ATpplμm
JJG177—2003
Table 4 (continued)
Mohs short taper
+26.0+20.0
Jag taper
+2.3+2.4+3.0+1.0+1.4+1.9
1. Maximum allowable error of taper angle The data of the difference ATp is given according to the length L, that is, ATpp=ATL×10-3, where: Lp-
measurement length, mm; ATp
corresponds to the measurement length L, the maximum allowable error of the cone angle expressed by the line value, um; AT is the maximum allowable error of the cone angle expressed by the angle value, urad or (\) 2. Unit 1μurad is equal to the central angle corresponding to the radius of 1m and the double length of Iμm. 5jμrad~1; 300urad~1. 4.4.3 The maximum allowable error of the cone angle of the working plug gauge shall not exceed the provisions of Table 5. 4.5 Plug gauge sizebzxZ.net
The distance from the front edge of the first scale line to the end face I, I; the diameter of the front edge of the scale line D; the distance between the two scale lines Z, z,, a; the flat tail size b, e and its symmetry As shall not exceed the provisions of Table 6. 4.6 Scale width
The scale width shall not exceed 0.15mm.
4.7 Ring gauge dimensions
Dimensions z, Z; dimensions e, lo, l, l, 2, l3: Dimension h shall not exceed the provisions of Table 6. 4.8 Matching dimensions of plug gauges and ring gauges
4.8.1 Morse and metric taper gauges: When using a calibration plug gauge or working plug gauge to check the diameter tolerance of a taper working ring gauge, the large end face of the taper working ring gauge shall coincide with the front edge of the marking line of the large end diameter D platform of the plug gauge, and a gap of no more than 0.1Z is allowed (see Figure 6).
Accuracy level
Accuracy level
μurad
ATrlpum
ATaμm
JJG177—2003
Maximum allowable error of cone angle of working plug gauge
-200.0-160.0
ATorlμm
-41.0-33.0
AToeμm
Accuracy level
±2.0±2.4±2.2±2.8
-10.0-12.0-11.0-14.0
Mohs short cone
μrad±50.0
±125.0±100.0
AToeμm
D±IT5/2
Sebh8
±26.0±20.0
，±IT10/2
Jag cone
±0.5±0.8
±2.4 ±3.0
±1.4±1.9
Basic dimensions of tapered plug gauge
12.065|17.780|23.825|31.26744.399|63.380200
26.1832.1938.1950.2062.22
a (not greater than)2.03.0
102.5129.5
10.012.016.020.0
e (not greater than)
lz±I11/2
+IT11/2
. (not greater than)
e(not greater than)
D±IT5/2
1±IT11/2
1+IT11/2
D±IT5/2
l±IT8/2
A (not less than)
1, ±IT8/2
JJG177—2003
Table 6 (continued)
Mohs short cone
48.058.068.0
88.0108.0
25.06|31.06
13.0616.0619.06
88.0108.0
133.350165.100|203.200
Jag cone
17.780|21 .793|23.8256.350
10.09412.06515.7331
9.75414.19915.85017.170|20.59916.0
Front edge of marking line
Large end diameter D plane marking line
4.8.27:24 Cone gauge: When checking the cone diameter tolerance of the cone working ring gauge with a check plug gauge, the cone large end face of the cone working ring gauge should coincide with the large end diameter D plane marking line of the check gauge, and a gap of no more than 0.3Z is allowed. If the working plug gauge is used for inspection, the distance between the cone large end face of the cone working ring gauge and the second Z marking line should not be less than z, and a distance of no more than 1.3z is allowed (see Figure 7). 4.8.3 Drill clamp taper gauge: When using a proofing plug gauge or a working plug gauge to check the taper diameter tolerance of the taper working ring gauge, 7
Working ring gauge
Working plug gauge
JJG177—2003
Working ring gauge
Front edge of the marking line
Second Z marking line
First Z marking line
Front edge of the marking line
Large end diameter D plane
Marking line
Proofing plug gauge
The large end face of the taper working ring gauge should coincide with the large end diameter D plane marking line of the plug gauge, with a difference of 0.2Z allowed (see Figure 8).
Front edge of marking line
Rear edge of marking line
Large end diameter D plane marking line
4.9 Grinding contact rate of plug gauge and ring gauge
For cone working ring gauges of various accuracy grades, the grinding contact rate should be above 90% when inspected with proofreading plug gauges. If they are ground together with working plug gauges, the grinding contact rate should be above 98%. The thickness of the coating layer should not exceed the requirements in Table 7.
Table 7 Coating thickness
Cone length L/mm
Working gauge
Purpose code
G and GR
Note: G
Working gauge
Accuracy level
>16~40
>40~100
Coating thickness/gμm
Inspect the cone size and cone angle of the workpiece; GR-Inspect the cone angle of the workpiece. >100~250
>250~6309 Grinding contact rate of plug gauge and ring gauge
For cone working ring gauges of various accuracy levels, when tested with calibration plug gauges, the grinding contact rate should reach more than 90%. If it is ground with the working plug gauge, the grinding contact rate should reach more than 98%, and the coating thickness should not exceed the provisions of Table 7.
Table 7 Coating thickness
Cone length L/mm
Working gauge
Purpose code
G and GR
Note: G
Working gauge standard
Accuracy level
>16~40
>40~100
Coating thickness/gμm
Inspect the cone size and cone angle of the workpiece; GR-Inspect the cone angle of the workpiece. >100~250
>250~6309 Grinding contact rate of plug gauge and ring gauge
For cone working ring gauges of various accuracy levels, when tested with calibration plug gauges, the grinding contact rate should reach more than 90%. If it is ground with the working plug gauge, the grinding contact rate should reach more than 98%, and the coating thickness should not exceed the provisions of Table 7.
Table 7 Coating thickness
Cone length L/mm
Working gauge
Purpose code
G and GR
Note: G
Working gauge standard
Accuracy level
>16~40
>40~100
Coating thickness/gμm
Inspect the cone size and cone angle of the workpiece; GR-Inspect the cone angle of the workpiece. >100~250
>250~630
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