Sys Lab Magazine 310 172
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Transcript of Sys Lab Magazine 310 172
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National Institute of Metrology (Thailand)
Ministry of Science and Technology of Thailand
Hand torque tools calibration Hand torque tools calibration according to ISO 6789: 2003(E)according to ISO 6789: 2003(E)
NATTAPON SAENKHUMMetrologist
Torque laboratoryDepartment of mechanical metrology
2553 1-2 .. 2553
Assembly tools for screws and nuts-Hand tools-Requirements and test methods for design conformance testing and recalibration
procedure
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National Institute of Metrology (Thailand)
Ministry of Science and Technology of Thailand
1. Scope
Torque tool 4 ( Classification) indicating setting torque wrench 258 259 ISO 1703: 1983It applies to torque tools in accordance with Clause 4, in particular to indicating and setting torque wrenches in accordance with numbers 258 and 259 of ISO 1703: 1983.
International Standard / Hand torque tools This International Standard specifies the requirements for, and describes the test methods and marking of, hand torque tools used for controlled tightening of bolted connections.
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National Institute of Metrology (Thailand)
Ministry of Science and Technology of Thailand
2. Classification
a) Type I: Indicating torque tools
Tool that indicates by means of a mechanical scale, dial or electronic display, the value of torque exerted by the tool at the out put drive
- Class A: wrench, torsion or flexion bar- Class B: wrench, rigid housing, with scale or dial display- Class C: wrench, rigid housing and electronic measurement- Class D: screwdriver, with scale or dial display- Class E: screwdriver, with electronic measurement
Hand torque tools International Standard
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Ministry of Science and Technology of Thailand
2. Classification
a) Type I: Indicating torque tools
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National Institute of Metrology (Thailand)
Ministry of Science and Technology of Thailand
2. Classification
a) Type I: Indicating torque tools
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National Institute of Metrology (Thailand)
Ministry of Science and Technology of Thailand
2. Classification
b) Type II: Setting torque tools
Tool that is pre-set to a certain torque value, so that, when the prescribed value of torque is exerted by the tool at the output drive, a signal is release (e.g. audibly, visibly, perceptibly)
- Class A: wrench, adjustable, graduated or with display - Class B: wrench, fixed adjustment- Class C: wrench, adjustable, non-graduated- Class D: screwdriver, adjustable, graduated or with display- Class E: screwdriver, fixed adjustment- Class F: screwdriver, adjustable, non-graduated- Class G: wrench, flexion bar, adjustable, graduated
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National Institute of Metrology (Thailand)
Ministry of Science and Technology of Thailand
2. Classificationb) Type II: Setting torque tools
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National Institute of Metrology (Thailand)
Ministry of Science and Technology of Thailand
2. Classification
b) Type II: Setting torque tools
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National Institute of Metrology (Thailand)
Ministry of Science and Technology of Thailand
3. Tolerances
a) Indicating torque tools (Type I)
Table 1: Permissible deviation (Type I)
a In the case of torque tools with electronic measurement (Class C and E) and display (Class B and Class D), the value of permissible deviation include the error due to the resolution of the display
4 % 6 %B, C and E
6 %A and D
> 10 Nm 10 Nm
Maximum torque valueClassa
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National Institute of Metrology (Thailand)
Ministry of Science and Technology of Thailand
3. Tolerances
b) Setting torque tools (Type II)
Table 2 : Permissible deviation (Type II, Classes A, B, D, E and G)
a In the case of torque tools with display (Class A and D), the value of permissible deviation include the error due to the resolution of the display
6 %D, E and G
4 % 6 %A and B
> 10 Nm 10 Nm
Maximum torque value
Classa
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National Institute of Metrology (Thailand)
Ministry of Science and Technology of Thailand
3. Tolerances
c) Indicating torque tools (Type I) Setting torque tools (Type II)
Table 3 : Permissible deviation (Type II, Classes C and F)
6 %F
4 % 6 %C
> 10 Nm 10 Nm
Maximum torque value
Class
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National Institute of Metrology (Thailand)
Ministry of Science and Technology of Thailand
4. Calibration
Calibration devices (Torque wrench calibrator Torque screwdriver calibrator) uncertainty of measurement 1% of Rdg, k = 2 95% Guide for evaluation of uncertainty of measurement (GUM)
4.1 Calibration devices
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National Institute of Metrology (Thailand)
Ministry of Science and Technology of Thailand
4.2 Environment condition
18C 28C 1C 90%RH
4. Calibration
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National Institute of Metrology (Thailand)
Ministry of Science and Technology of Thailand
4. Calibration
4.3 Calibration condition
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National Institute of Metrology (Thailand)
Ministry of Science and Technology of Thailand
4. Calibration
4.3 Calibration condition
20
100
60
40
80
% O F FULL SCALE
ELECTRONIC TRANSDUCER SYSTEM
O FF
PO WERO N
SELECTUNI TS
M EM O RYRESET
AUTORESET
M EM O RYAUTO RESETTRIGGER LEVEL
% OF FULL SCALE
0.7
0.8
1.0
1.2
1.5
1.9 2.54
710
STOP
N. m/LO AD
lbf . f t
lbf . ins
STD
UUC
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National Institute of Metrology (Thailand)
Ministry of Science and Technology of Thailand
4. Calibration
4.3 Calibration condition
20
100
60
40
80
% OF FULL SCALE
ELECTRONIC TRANSDUCERSYSTEM
OFF
POWERON
SELECTUNITS
MEMORYRESET
AUTORESET
MEMORY
AUTORESETTRIGGERLEVEL% OF FULLSCALE
0.70.81.01.2
1.5 1.92.547
10
STOP
N.m/LOAD
lbf.ft
lbf.ins
STD
UUC
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Ministry of Science and Technology of Thailand
4.4 Calibration sequence
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National Institute of Metrology (Thailand)
Ministry of Science and Technology of Thailand
5. Calculation1.
( Hand torque tools Type I class Type II class C, F)
( ) ( )r
ras x
xxA 100% =
As(%) Torque tools %xa Torque Toolsxr torque standard
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National Institute of Metrology (Thailand)
Ministry of Science and Technology of Thailand
5. Calculation
( ) ( )r
ras x
xxA 100% =
10..... 10321 rrrr
raxxxxxx +++==
2. torque tools type II class C F
As(%) Torque tools %xa xr
xr torque standard
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National Institute of Metrology (Thailand)
Ministry of Science and Technology of Thailand
6. Hand torque tools6.1 Hand torque tools
( )sA
ras XXA =
( ) ( )rXrrXaas LbrXrXA = '
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National Institute of Metrology (Thailand)
Ministry of Science and Technology of Thailand
6. Hand torque tools6.1 ()
Torque tools Hand torque tools (Long-term stability)
rXrXaras LbrrXXA +++= 'aXrXXar'brL
Xrr
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DKD-R 3-8: 2003 ( 1%) DKD-R 3-8: 2003 (Long-term stability) (Error)
National Institute of Metrology (Thailand)
Ministry of Science and Technology of Thailand
6. Hand torque tools6.2
,
( ) 2r22'2r XrXa wwwwAw rXbsC +++=2Xr
w
( )sAwkW CE =
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Ministry of Science and Technology of Thailand
Table 4 Distribution functions
Rel. standard uncertainty of the result in %:
- type B, normal distribution
-Rel. uncertainty of the applied torque value in %
- type B, rectangular distributionrXr
1Resolution of the torque calibration devices, rXr
- type B, rectangular distributionrXa
1Resolution of the torque tools, rXa
- type A, normal distributionRepeatability, b
RemarkRelative standard uncertainty in %ParametersUncertainty component
rb Xn
bw 100'
' =
a
10032 X
rwXar
=
r
10032 X
rwXrr
=
rXw
2X
222' rXrXa
wwwww rrbC +++=
6. Hand torque tools
: 1 Analog scale ra,
1003 X
r
( )( )11
2,
'
==
n
XXb
n
irir
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Ministry of Science and Technology of Thailand
Table 5 Symbols, units and designations
Nm
Analogue scale: obtained from the ratio of the width of the pointer to the centre-to-centre distance between adjacent scale marks (scale spacing)-recommended ratios are 1/2, 1/5 or 1/10 : spacing not smaller than 1.25 mm are required to estimate a tenth of the scale division.Digital scale: the resolution r is considered to be one increment of the least significant active digit of the numerical indicating device, provided that the indication does not fluctuate by more than one increment when the instrument is unloaded. If the reading (unloaded) fluctuates by more than the value previously determined for the resolution, the resolution should be deemed to be equal to half the range of fluctuation.
NmRepeatability of measurement
NmMean value of
%Relative standard uncertainty of the applied torque value of the torque standard devices
NmIndicated value of torque tools
UnitDesignationSymbol
nXXX rrr ,..., 21
aX
rXw
'b
r
rX
6. Hand torque tools
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National Institute of Metrology (Thailand)
Ministry of Science and Technology of Thailand
6. Hand torque tools
Table 6 Example of uncertainty budget of setting torque wrench type II class A at 20 Nm
Quantity Estimate Relative Probability Sensitivity Relativestandard distribution coefficient uncertainty v i or v eff
uncertainty contributionX i x i , Nm w (x i ), % c i wi (y), %X a 20 - - - - -
20.28 0.50 Normal 1 0.50 r xa 0 0.29 Rectangular 1 0.29 b ' 0 0.23 Normal 1 0.23 4r xr 0 0.014 Rectangular 1 0.01
Combined relative uncertainty, w C 0.62Expanded rel. uncertainty, WE at k=2 1.24
208A s -0.285M
rX
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National Institute of Metrology (Thailand)
Ministry of Science and Technology of Thailand
6. Hand torque tools k = 2 95% ( 95.45%) (degree of freedom) (infinity) (effective degrees of freedom) Welch-Satterthwait
( )( )
=
=N
i i
i
ceff yw
yw
1
4
4
( )ywc( )ywi
i
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Ministry of Science and Technology of Thailand
6. Hand torque tools () 95.45% 7 t-distribution 100 k = 2
28
( )k2TN Mw 7M
V a l u e s o f t p ( V ) f r o m th e t - d i s t r i b u t io n f o r d e g r e e s o f f r e e d o m v t h a t d e f i n e a n in t e r v a l t h a t e n c o m p a s s e s s p e c i f i e d f r a c t i o n s p o f t h e c o r r e s p o n d in g d i s t r i b u t i o n
D e g r e e s o f f r e e d o m
%2 7.6 8= %9 0= %9 5= %4 5.9 5= %9 9= %7 3.9 9=
1 1 .8 4 6 .3 1 1 2 .7 1 1 3 .9 7 6 3 .6 6 2 3 5 .8 0 2 1 .3 2 2 .9 2 4 .3 0 4 .5 3 9 .9 2 1 9 .2 1 3 1 .2 0 2 .3 5 3 .1 8 3 .3 1 5 .8 4 9 .2 2 4 1 .1 4 2 .1 3 2 .7 8 2 .8 7 4 .6 0 6 .6 2 5 1 .1 1 2 .0 2 2 .5 7 2 .6 5 4 .0 3 5 .5 1
6 1 .0 9 1 .9 4 2 .4 5 2 .5 2 3 .7 1 4 .9 0 7 1 .0 8 1 .8 9 2 .3 6 2 .4 3 3 .5 0 4 .5 3 8 1 .0 7 1 .8 6 2 .3 1 2 .3 7 3 .3 6 4 .2 8 9 1 .0 6 1 .8 3 2 .2 6 2 .3 2 3 .2 5 4 .0 9
1 0 1 .0 5 1 .8 1 2 .2 3 2 .2 8 3 .1 7 3 .9 6
1 1 1 .0 5 1 .8 0 2 .2 0 2 .2 5 3 .1 1 3 .8 5 1 2 1 .0 4 1 .7 8 2 .1 8 2 .2 3 3 .0 5 3 .7 6 1 3 1 .0 4 1 .7 7 2 .1 6 2 .2 1 3 .0 1 3 .6 9 1 4 1 .0 4 1 .7 6 2 .1 4 2 .2 0 2 .9 8 3 .6 4 1 5 1 .0 3 1 .7 5 2 .1 3 2 .1 8 2 .9 5 3 .5 9
1 6 1 .0 3 1 .7 5 2 .1 2 2 .1 7 2 .9 2 3 .5 4 1 7 1 .0 3 1 .7 4 2 .1 1 2 .1 6 2 .9 0 3 .5 1 1 8 1 .0 3 1 .7 3 2 .1 0 2 .1 5 2 .8 8 3 .4 8 1 9 1 .0 3 1 .7 3 2 .0 9 2 .1 4 2 .8 6 3 .4 5 2 0 1 .0 3 1 .7 2 2 .0 9 2 .1 3 2 .8 5 3 .4 2
2 5 1 .0 2 1 .7 1 2 .0 6 2 .1 1 2 .7 9 3 .3 3 3 0 1 .0 1 1 .7 0 2 .0 4 2 .0 9 2 .7 5 3 .2 7 3 5 1 .0 1 1 .7 0 2 .0 3 2 .0 7 2 .7 2 3 .2 3 4 0 1 .0 1 1 .6 8 2 .0 2 2 .0 6 2 .7 0 3 .2 0 4 5 1 .0 1 1 .6 8 2 .0 1 2 .0 6 2 .6 9 3 .1 8
5 0 1 .0 1 1 .6 8 2 .0 1 2 .0 5 2 .6 8 3 .1 6
1 0 0 1 .0 0 5 1 .6 6 0 1 .9 8 4 2 .0 2 5 2 .6 2 6 3 .0 7 7 1 .0 0 0 1 .6 4 5 1 .9 6 0 2 .0 0 0 2 .5 7 6 3 .0 0 0
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Ministry of Science and Technology of Thailand
7. Calibration record ISO/IEC 17025: 2005 General requirements for the competent of testing and calibration laboratories 4.13.2 4.13.2.1 /
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Ministry of Science and Technology of Thailand
7. Calibration record4.13.2 4.13.2.1 1. 2. ( 5.4.7) / worksheets work books check sheets work notes control graphs
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Ministry of Science and Technology of Thailand
7. Calibration record
4.13.2.2
4.13.2.3
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Ministry of Science and Technology of Thailand
7. Calibration record
Record no. .Page 1 of 1 page
Work order no. : xxxx Item No. : xxCustomer : National Institute of Metrology (Thailand)Address : 3/4-5 Moo 3, Klong 5, Klong Luang
Pathumthani 12120Equipment : Indicating torque wrench Type: I Class: CMaximum capacity: 100 Nm Resolution: 0.1 Nm Model : xxxxSerial no. : xxxxManufacturer : xxxxEnvironment : 221 C, 5010 %RHCalibration Date : dd/mm/yyyyCalibration Procedure : ISO 6789: 2003(E)
Calibrated by : Checkd by :
Calibration devices :Item Rel.exp.Uncert. %
123
Calibration result :Tolerance limit: 4%Clockwise
% Nm 1st 2nd 3rd 4th 5th Mean 1st 2nd 3rd 4th 5th Mean20 20 20.30 20.35 20.20 20.40 20.15 20.28 -1.48 -1.72 -0.99 -1.96 -0.74 -1.3860 60 61.00 60.80 60.50 60.70 61.00 60.80 -1.64 -1.32 -0.83 -1.15 -1.64 -1.31100 100 101.80 101.50 101.60 101.40 101.00 101.46 -1.77 -1.48 -1.57 -1.38 -0.99 -1.44
Anticlockwise
% Nm 1st 2nd 3rd 4th 5th Mean 1st 2nd 3rd 4th 5th Mean20 -20 -20.30 -20.35 -20.20 -20.40 -20.15 -20.28 -1.48 -1.72 -0.99 -1.96 -0.74 -1.3860 -60 -61.00 -60.80 -60.50 -60.70 -61.00 -60.80 -1.64 -1.32 -0.83 -1.15 -1.64 -1.31100 -100 -101.80 -101.50 -101.60 -101.40 -101.00 -101.46 -1.77 -1.48 -1.57 -1.38 -0.99 -1.44
Uncertainty Budget :ClockwiseNominal Value Rel. exp. Uncert. v eff
% N.m. Repeat. UUCres. STDres. Deviation w rep w UUC res w STD res w STD w C at k=2, WE 20 20 0.52 0.50 0.05 -1.38 0.23 0.14 0.014 0.50 0.57 1.14 14660 60 0.35 0.17 0.02 -1.31 0.16 0.05 0.005 0.50 0.53 1.05 492100 100 0.30 0.10 0.01 -1.44 0.13 0.03 0.003 0.50 0.52 1.04 931
AnticlockwiseNominal Value Rel. exp. Uncert. v eff
% N.m. Repeat. UUCres. STDres. Deviation w rep w res w STD res w STD w C at k=2, WE 20 -20 -0.52 -0.50 -0.05 -1.38 -0.23 -0.14 -0.014 0.50 0.57 1.14 14660 -60 -0.35 -0.17 -0.02 -1.31 -0.16 -0.05 -0.005 0.50 0.53 1.05 492100 -100 -0.30 -0.10 -0.01 -1.44 -0.13 -0.03 -0.003 0.50 0.52 1.04 931
Calibration Record
UUC reading Calibration devices reading in Nm Deviation in %
1.0xxxxTorque wrench calibratorS/N
dd/mm/yyyyDate DueModel
xxxxDescription
UUC reading Calibration devices reading in Nm Deviation in %
Relative deviation in % Relative standard uncertainty in %
Relative deviation in % Relative standard uncertainty in %
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National Institute of Metrology (Thailand)
Ministry of Science and Technology of Thailand
8. Calibration certificate
ISO/IEC 17025: 2005 5.10.2
) ( )) / ) ( )
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National Institute of Metrology (Thailand)
Ministry of Science and Technology of Thailand
8. Calibration certificate
) ) ) ) ) /)
5.10.2
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Ministry of Science and Technology of Thailand
8. Calibration certificate
) ) 1. 2.
5.10.2
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Ministry of Science and Technology of Thailand
8. Calibration certificate Certificate No. ?
Uncertainty of measurement ?
Certificate No. ?
Uncertainty of measurement ?
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Ministry of Science and Technology of Thailand
8. Verification 8 Graphic representation of the results verification
The allowable permissible deviation according to ISO 6789 : 2003 (E) is 6%
This verification chart is concerned of deviation, repeatability, readability and the uncertainty of calibration device.
Rel. Indication deviatin of each measurement results for clockwise and anticlockwise torque
-8
-6
-4
-2
0
2
4
6
8
1 2 3 4 5measurement no.
rela
tive
devi
atio
n in
% o
.r.
-1 Nm
-3 Nm
-5 Nm
1 Nm
3 Nm
5 Nm
tolerance 6%
Rel. Indication deviation of results for clockwise and anticlockwise torque
-8
-6
-4
-2
0
2
4
6
8
-6 -4 -2 0 2 4 6torque in Nm
rela
tive
devi
atio
n in
% o
.r.