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Instrument Calibration Procedure

Internal and External Dial, Vernier and DigitalCalipers and Outside Micrometers

GPC CAL00DA!E 0"0#

$EV% 0

&ualit' Assurance Manager

Appro(ed Date)



*EC!IO+

I+!$OD C!IO+ A+D DE*C$IP!IO+

% !-is procedure describes t-e calibration o. Internal and External Dial, Vernier and

Digital Calipers and Outside Micrometers% !-e instrument being calibrated isre.erred to -erein as t-e !I /!est Instrument

%1 !-is procedure includes test and essential per.ormance parameters onl'% An'mal.unction noticed during calibration, 2-et-er speci.icall' tested .or or not,s-ould be corrected%

!able Calibration Description

!I !IC-aracteristics

Per.ormance*peci.ication !est Met-od

Dial, Vernierand Digital

Calipers

3ero indication test !est point 0 in%!olerance 4"5 %0006 in% Determined b' slidingt-e 7a2s toget-er andreading t-e !I

indication%Outside accurac' $ange 0 to 18

!olerance) see !able IIComparison to gage

bloc9s bet2een t-e !I 7a2s%

Inside accurac' $ange 0 to 18!olerance) see !able II

Comparison to gage bloc9s dimensions placing t-e bloc9s

2it- attac-ed caliper

7a2s outside t-e !I 7a2s%Dept- gage accurac' $ange 0 to 18 Comparison to gage

bloc9 dimensions, placing t-e !I dept-

gage bloc9 andreading t-e !I outside

dimension scale%OutsideMicrometers

Lengt- and Linearit' $ange) 0 to 18 Measured b'comparing !I

indications to gage

bloc9 dimensionssetup to test t-e basiclengt- and

micrometer -eadlinearit'%



*EC!IO+ 1

E& IPME+! $E& I$EME+!*

!able 1 E:uipment $e:uirements

Item Minimum se*peci.ications

CalibrationE:uipment

1% Gage ;loc9 *et $ange %0605 <8!olerance %00006

E**M =*E00>0

1%1 Lo2 po2er magni.ier !o aid in reading t-e !L(ernier or barrel scale

1%? Micrometer 2renc- Ad7ustment o. micrometer 1%< *mall 7e2elers scre2dri(er Ad7ustment o. caliper 1%6 *mall clamp @old gage bloc9s .or inside

measurement comparison

1%> Lig-t mac-ine oil or spra' Lubrication o. slides ort-imble1%# Clean .lat sur.ace *ur.ace Plate or *teel ;loc9

*EC!IO+ ?

P$ELIMI+A$ OPE$A!IO+*

?% !I I+*PEC!IO+

?%1 Ensure t-at t-e 2or9 area is clean, 2ell illuminated, .ree .rom excessi(e dra.ts,

.ree .rom excessi(e -umidit', and t-at t-e rate o. temperature c-ange does notexceed < oB per -our%

?%? Ensure t-at t-e gage bloc9 set /item 1% is clean and t-at t-e !I and t-e gage bloc9s -a(e been allo2ed to stabili e at t-e ambient temperature .or a minimumo. 1 -ours%

CALIPERS

?%< Ensure t-at t-e !I 7a2s slide smoot-l' and .reel' along t-e .ull lengt- o. t-e !I beam, i. not ta9e correcti(e action%

?%6 Inspect to ensure t-e 7a2s are .ree o. nic9s and burrs and t-at it is clean and .ree.rom damage t-at 2ould impair its operation%

+O!E!I test point are basicall' determined b' selecting < test point 2it-in t-e .irst inc-o. range and < to point additional test points extending o(er t-e remainder o. t-e!I range at approximatel' e:ual spacing%



?%> In order top minimi e t-e number o. gage bloc9s needed to test calipers 2it--ig-er ranges, select test point at 16, 60, #6, and 00 o. t-e !I range be'ond t-e

st inc- and round to t-e nearest F inc-% se ma7or (ernier graduations or normalelectronic digital (alues as test points as necessar'%

OUTSIDE MICROMETERS

?%# *lo2l' rotate t-e !I micrometer t-imble, and ensure t-at it operates smoot-l' itsentire range%

?% !-e !I lengt- measurement test s-ould be pre.ormed at approximatel' > pointsacross t-e range o. t-e !I% Bor example, 0 to 8 micrometer ma' -a(e calculatedtest points at %000, %100, %<00, %>00, % 00 and %000 inc-%

*EC!IO+ <

CALI;$A!IO+ P$OCE**CALIPERS

+O!E*nless ot-er2ise speci.ied, (eri.' t-e results o. eac- test and ta9e correcti(e action

2-ene(er t-e test re:uirement is not being met be.ore proceeding%

Cotton glo(es s-ould be 2orn 2-en -andling gage bloc9s to pre(ent t-e trans.er o. bod'-eat, protect t-e gage sur.aces%

<% 3E$O !E*!

<% % *lide t-e !I 7a2s toget-er, ensuring t-at no lig-t is (isible bet2een t-e 7a2smeasuring sur.aces% I. t-e !I -as inside measurement capabilit', (eri.' t-at t-edial indicator or (ernier indicates ero, as necessar'% Ad7ust t-e dial be el, i.necessar'%

<% %1 !ig-ten t-e !I sliding 7a2 set scre2, i. applicable

<% %? I. t-e !I -as a digital readout, depress t-e ero set and (eri.' t-at t-e digitalindication reads 0%000%

<% %< I. t-e !I is a (ernier t'pe, (eri.' t-at t-e !I ero mar9s are aligned, as applicable%

<%1 O !*IDE ACC $AC !E*!

<%1% Determine t-e gage bloc9s re:uired to obtain test points at a minimum o. < pointt-roug-out t-e .irst inc- o. t-e !I as .ollo2s % 16, %?00, %>60, and %000 inc-%



<%1%1% Open t-e !I to be'ond t-e .irst test point% Insert t-e gage bloc9s and close t-e 7a2s until t-e' are .irml' in contact 2it- t-e gage bloc9% $epeat eac- reading ?56times and (eri.' t-at eac- indication does not exceed 4"5 o. t-e least dialgraduation%

<%1%? Veri.' t-at t-e .irst inc- test points are 2it-in 4"5 %00 inc- .or 05>8 range and 4"5%001 .or 05 18calipers%

<%1%< $epeat steps <%1%1 and <%1%? .or t-e remaining test points o. 16 , 60 , #6 and.ull range / 00 %

<%? I+*IDE ACC $AC !E*!

<%?% Determine t-e gage bloc9s re:uired to obtain test points at a minimum o. < pointt-roug-out t-e .irst inc- o. t-e !I as .ollo2s % 16, %?00, %>60, and %000 inc-%

<%?%1% sing a t-ree gage bloc9 set5up% Place t-e test gage bloc9 bet2een t2o ot-er bloc9s and secure 2it- a t-umb scre2 t'pe clamp /Bigure % Open t-e !I tot-e approximatel' t-e .irst test point% Insert t-e !I and open t-e 7a2s until t-e' are.irml' in contact 2it- t-e inside o. t-e gage bloc9s% $epeat eac- reading ?56 timesand (eri.' t-at eac- indication does not exceed 4"5 o. t-e least dial graduation%

<%?%? Veri.' t-at t-e .irst inc- test points are 2it-in 4"5 %00 inc- .or 05>8 range and 4"5%001 .or 05 18calipers%

<%?%< $epeat steps <%1%1 and <%1%? .or t-e remaining test points o. 16 , 60 , #6 and.ull range / 00 %

Gage BlockGage Block

Clamp

Test Point Gage Block

Bigure Inside Measurement *et5up

<%< DEP!@ ACC $AC

<%<% Position t-e end o. t-e !I beam against a %0 inc- gage bloc9 sur.ace 2it- t-e endo. t-e rod against t-e sur.ace plate or steel gage bloc9%



<%<%1 Ensure t-at t-e !I gage measuring sur.aces are s:uarel' placed against t-e sur.aceo. t-e gage bloc9 and t-e sur.ace plate%

<%<%? Ma9e an' necessar' .inal ad7ustments and note t-e scale indication%

<%<%< Veri.' t-at t-e (alue/s noted in t-e preceding step is 2it-in 4"5 %00 .or 05>8range and 4"5 %001 .or 05 18calipers%

<%<%6 Per.orm steps <%<% t-roug- <%<%< .or eac- additional inc- o. dept- gage range,c-anging gage bloc9s, as necessar'%

*EC!IO+ 6CALI;$A!IO+ P$OCE**

OUTSIDE MICROMETERS

6% Determine t-e gage bloc9s re:uired to obtain test points at a minimum o. 6 point%

/Lo2est !I indication, 10 , <0 , >0 , 0 and .ull range%6% % Ad7ust t-e spindle se(eral tent-s o. an inc- .rom ero, based on t-e !I basic

lengt-% *tarting 2it- t-e gage bloc9 e:ual to t-e lo2est !I range, slide t-e gage bloc9/s bet2een t-e an(il and spindle%

6% %1 Ad7ust t-e !I as applicable to contact t-e gage bloc9/s % $epeat eac- reading 15?times and (eri.' eac- indication% $e.er to !able ? Micrometer Calibration!olerance%

6% %? $epeat step 6% % H 6% %1 t-roug- t-e complete range o. t-e !I%

6%1 I. t-e !I is t-e interc-angeable an(il t'pe, attac- t-e eac- an(il in range and(eri.' as outlined in paragrap- 6% 56% %?%

!able ? Micrometer Calibration !oleranceMicrometer *i e $ange Calibration !olerance

2"(ernier Calibration !olerance

it-out (ernier 05 8 4"5 %000 4"5 %00

8518 t-roug- J85 08 4"5 %0001 4"5 %00085 8 and greater 4"5 %000? 4"5 %001

*EC!IO+ >LA;ELI+G A+D $ECO$D*

>% Complete a Measuring and !est Calibration $ecord /&A5< .or eac- itemcalibrated% tili e additional &A5< .orm as continuation s-eet as needed%



>%1 A..ix a calibration label to t-e !I 2it- t-e date calibrated, date o. next calibrationand 2-o per.ormed t-e calibration%

>%1% *pecial calibration label s-all be applied to an' item t-at -as not beencalibrated to itKs .ull' range o. capabilit'%

>%? All completed calibration records s-all be .ile and maintained%

Download - Instrument Calibration Procedure (3)

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