Electronics TSP-M User manual

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IM0124!2018-04!

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Electronics!Inc.!•!(574)!256-5001!•!www.electronics-inc.com!
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Table!of!Contents!
Description!...................................................................................................................................................................!3!
General!Information!.....................................................................................................................................................!3!
Environment!.................................................................................................................................................................!3!
Control!Features!...........................................................................................................................................................!4!
Quick!Switch!From!MM!to!Inch!....................................................................................................................................!4!
Factory!Default!Settings!...............................................................................................................................................!4!
Measuring!the!Pre-Bow!of!a!New!(Unpeened)!Almen!Strip!.........................................................................................!5!
Measuring!the!Arc!Height!of!a!Peened!Almen!Strip!.....................................................................................................!6!
Changing!the!Batteries!.................................................................................................................................................!7!
Calibration!....................................................................................................................................................................!8!
Inspection!of!the!Gage!Head!........................................................................................................................................!8!
Digital!Indicator!Instruction!Manual!Information!........................................................................................................!9!
Computer!Interface!Device!Accessory!..........................................................................................................................!9!
Trouble!Shooting!the!Model!TSP-M!...........................................................................................................................!10!
Checking!or!Setting!the!Spindle!Starting!Position!......................................................................................................!11!
Contacting!Electronics!Inc.!.........................................................................................................................................!11!
Limited!Warranty!........................................................................................................................................................!12!
Appendix!.....................................................................................................................................................................!13!
Introduction!to!Correlation!..................................................................................................................................!13!
The!Almen!Strips!and!Correlation!Holder!.............................................................................................................!13!
Examples!of!Correlation!.......................................................................................................................................!14!
Graph&1&-&3.26&A&to&1.15&Mini&A&....................................................................................................................&15!
Graph&2&-&3.25&A&to&1.25&Mini&A&....................................................................................................................&16!
Graph&3&–&3.5&A&to&1.25&Mini&A,&3.26&A&to&1.15&Mini&A&..................................................................................&17!
Graph&4&-&5.79&A&to&2.40&Mini&A,&5.95&A&to&2.46&Mini&A&................................................................................&18!
Graph&5&-&5.95&A&to&2.46&Mini&A&....................................................................................................................&19!
Graph&6&-&6.09&A&to&2.40&Mini&A&....................................................................................................................&20!
Graph&7&-&12.08&A&to&5.68&Mini&A,&18.40&Mini&N&...........................................................................................&21!
Graph&8&-&12.32&A&to&4.93&Mini&A&..................................................................................................................&22!
Graph&9&-&12.08&A&to&5.68&Mini&A&..................................................................................................................&23!
Compilation!of!Correlation!Data!..........................................................................................................................!24!
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Electronics!Inc.!•!(574)!256-5001!•!www.electronics-inc.com!
3!
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Description!
The!model!TSP-M!Almen!Gage!is!manufactured!to!the!specifications!of!SAE&J442&Test&Strip,&Holder&and& Gage&for&
Shot& Peening.! It! is! a! precision! device! used! for! measuring! the! curvature! of! a! metal! test! coupon! called! an! Almen!
mini-strip.!It!has!a!calibrated!electronic!digital!indicator!with!a!low-force!spindle!spring!to!provide!highly!accurate!
and!repeatable!measurements.!This!gage! will!provide!many! years!of!trouble-free!service! if!properly!maintained.!
The!gage!should!be!calibrated,!the!indicator!performance!should!be!tested,!and!the!support!platform!checked!for!
wear!annually!or!more!frequently!if!conditions!warrant.!!
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The!gage!comes!with!two!(2)!batteries!with!a!life!expectancy!of!at!least!one!(1)!year.!The!batteries!can!be!easily!
replaced!without!loss!of!calibration.!
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General!Information!
A!special!Zero!Block!(included)!will!set!the!digital!zero!reference.!
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Environment!
The! indicator! is! built! to! withstand! severe! use.! It! has! a! gasket-sealed! case,! a! hard! crystal! display! window! and! a!
durable! stem! assembly! to! resist! most! dust! and! fluids.! The! gage! should! never! be! immersed! in! liquid! as! this! will!
cause!damage!to!the!unit.!The!seals!and!boots!should!be!regularly!inspected!to!prevent!contamination.!The!dust!
cap!for!the!electronic!4-pin!connector!should!always!be!in!place!whenever!an!output!cable!is!not!attached.!This!
will!prevent!damage!to!the!connector.!Please!respect!the!recommended!temperature!ranges!shown!below.!
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Temperature!Range!
Storage:!
4°F!-!140°F!
-15.5°C!–!60°C!
Operation:!
60°F!-!90°F!
15.5°C!-!32°C!
The&magnetic&base&secures&the&&
Zero&Block&for&easy&access&
The&Zero&Block&on&the&
&magnetic&base&
The&Zero&Block&&

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Control!Features!
Three!red!control!buttons!on!the!display!perform!these!user!functions:!
•ZERO/ON:! Turns!the! unit! “ON”.! It! can! also! be! used! to! set! the! Spindle!
Starting!Position.!See!the!“Trouble!Shooting!the!Model!TSP-M”!section!for!
more!information!on!this!feature.!
•M/OFF:!This!button,!when!pushed!and!held!for!three!(3)!seconds,!turns!the!
unit!“OFF”.!!
•inch/mm:!Allows!the!selection!of!the!display!in!inches!or!millimeters.!
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Quick!Switch!From!MM!to!Inch!
SAE!J442!requires!Almen!gage!indicators!to!have!a!resolution!of!0.001!mm;!therefore,!the!TSP-M!Almen!Gage!is!
factory!set!to!display!0.000!mm,!with!a!0.001!mm!resolution.!
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Pressing!the! inch/mm!button,! changing!measurement!units! from!millimeters!to! inches,!results! in!a! five!(5)!digit!
display!(0.00000!inch)!with!a!resolution!of!0.00005!inch.!
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If!a!display!of!only!four!(4)!digits!(0.0000)!in!inches!is!preferred,!use!the!following!steps!to!reprogram!the!indicator.!
1. Turn!on!the!TSP-M!by!pressing!ZERO/ON.!
2. Press!inch/mm!to!change!the!scale!to!inches!
3. Press!the!M/OFF!and!inch/mm!buttons!at!the!same!time!(M1!will!appear!on!the!bottom!left!of!the!display)!
4. Press!M/OFF!four!(4)!times!
5. Press!inch/mm!six!(6)!times!until!the!display!shows!0.0001!
6. Press!M/OFF!to!exit!the!programming!mode!
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Factory!Default!Settings!
Indicator!Polarity!
The! indicator! should! be! in! the! Reverse! Measurement! Direction! mode! as! indicated! by! “R”! at! the! bottom! of! the!
display.!This!allows!for!positive!numbers!to!be!shown!on!the!display!as!the!indicator!extends!into!the!concave!arc!
of!the!Almen!strip.!If!the!“R”!is!not!shown,!see!the!“Trouble!Shooting!the!Model!TSP-M”!section!to!return!to!the!
Reverse!Measurement!Direction!Mode.!
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Resolution!
Metric!mode!resolution!is!factory!set!to!three!(3)!decimal!places!(e.g.,!0.600!mm).!If!the!inch!mode!is!required,!the!
resolution! will!be! set!at! five!(5)!places!(e.g.,!0.00240!inch)!by!default.!See!the!“Quick! Switch!from! MM! to!Inch”!
section!above!to!change!the!resolution!to!only!four!(4)!places.!!
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Red&control&buttons&

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The&small&side&of&the&Zero&Block&is&placed&
on&the&gage.&The&reading&is&0.000&mm.&
Measuring!the!Pre-Bow!of!a!New!(Unpeened)!Almen!Strip!
The!following!steps!should!be!performed!on!the!standard!Almen!strips!and!the!mini-strips.!
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1. Push!the!ZERO/ON!button!to!turn!the!gage!“ON”.!
2. Place! the! Zero! Block!on! the! gage! with! the! indicator! tip! touching! the! small!side!of! the! block.!Push! the!
ZERO/ON!button!to!achieve!0.000!mm!in!the!display.!!
3. Place!a! new! (unpeened)!Almen! strip!onto! the!measurement!position.! Be! sure! the! strip! touches! the! back!
posts!and!is!centered!between!the!end!posts.!!
4. Read!and!record!the!pre-bow!(also!called!flatness).!!
5. Turn!the!strip!over!and!measure!the!opposite!side.!If!the!reading!from!either!side!exceeds!the!specification!
value,!discard!the!strip.!(See!Table!1!for!common!examples!of!acceptable!pre-bow).!
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Table!1.!Examples!of!common!industry!Almen!strip!requirements!for!maximum!pre-bow!of!unpeened!strip!
Specification!
Grade!
mm!
Inch!
AMS2432,!Shot!Peening,!Computer!Monitored!
A1-S™,!N1-S™!
±0.013!
±0.0005!
AMS2430,!Shot!Peening!
A-1™,!N-1™!
±0.025!
±0.0010!
J442,!Test!Strip,!Holder!and!Gage!for!Shot!Peening!
A-1™,!N-1™!
±0.025!
±0.0010!
MIL-S-13165!Shot!Peening!of!Metals!(Canceled)!
A-2™,!N-2™!
±0.038!
±0.0015!
An&unpeened&&
mini-strip&placed&on&
the&mini-strip&gage.&
An&unpeened&&
Standard&Almen&
strip&placed&on&the&
#2&Almen&gage.
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Electronics!Inc.!•!(574)!256-5001!•!www.electronics-inc.com!
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Measuring!the!Arc!Height!of!a!Peened!Almen!Strip!
The!following!steps!should!be!performed!on!the!standard!Almen!strips!and!the!mini-strips.!
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Step!One!–!Zero!the!Almen!Gage!
1. Push!the!ZERO/ON!button!to!turn!the!gage!“ON”.!!
2. Place!the! Zero!Block! on! the! gage! with! the! indicator! tip! touching!
the!small!side.!Push!the!ZERO/ON!button!to!achieve!0.000!mm!in!
the!display.!
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Step!Two!–!Perform!Pre-Bow!Compensation!
If!your!shot!peening!procedure,!such!as!process!development!or!system!
capability! studies,! requires! higher! intensity! accuracy,! pre-bow!
compensation! may! be! used.! This! technique! can! provide! an! additional!
reduction! in! process! uncertainty.! A! pre-bow! compensation!ensures!that!
only!the!net!difference!in!arc!height!of!a!peened!Almen!strip!is!plotted!on!
a!saturation!curve.!To!perform!pre-bow!compensation:!
1. Zero!the!Almen!gage!and!then!place!the!unpeened!Almen!strip!on!
the!gage!and!record!its!value.!!
2. Be!sure!to!note!if!value!is!positive!or!negative!and!write!the!value!
on!the!opposite!side!of!the!strip.!!
3. Do! not! peen! the! side! of! the! Almen! strip! with! your! handwritten!
note.!!
4. A!positive!number!is!subtracted!from!the!arc!height!reading!
after!the!strip!has!been!peened.!A!negative!number!is!added!
to! the! arc! height! reading! after! the! strip! has! been! peened.!
For!example:!
a) If!the!pre-bow!is!+2! and!the! arc!height!reading!is! 10,!
the!adjusted!arc!height!reading!is!8!
b) If! the! pre-bow! is! -2! and! the! arc! height! reading! is! 10,!
the!adjusted!arc!height!reading!is!12!
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In! summary,! most! peening! applications! can! tolerate! the! SAE! J442!
pre-bow!bias!of!±0.001”!for!N!and!A!strips.!If!this!tolerance!level!is!
too! high,! you! can! apply! the! pre-bow! compensation! discussed!
above.!!
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Step!Three!–!Measure!the!Arc!Height!
1. Place!the! peened!Almen! strip! onto!the! measurement!position! with!
the!indicator!tip!touching!the!non-peened!side!(concave!side)!of!the!
strip.!Record!the! value!of! the!arc! height! shown! in!the! display!or,! if!using!pre-bow! compensation,!the!arc!
height!shown!in!the!display!with!the!pre-bow!compensation!applied.!
2. Remove!the!strip!and!place!it!once!again!on!the!gage.!Do!this!three!(3)!times!to!assure!an!accurate!reading.!!
3. When!finished,!push!and!hold!the!M/OFF!button!for!three!(3)!seconds!to!turn!the!gage!“OFF”.!(The!gage!
automatically!turns!“OFF”!if!it!is!not!active!for!15!minutes.)!
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Peened&mini-strip&placed&on&the&mini-
strip&gage.&The&reading&is&0.199&mm.&
Peened&standard&Almen&strip&placed&
on&the&#2&Almen&gage.&

Electronics!Inc.!•!(574)!256-5001!•!www.electronics-inc.com!
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Battery&Low&message&
Changing!the!Batteries!
The! Almen!gage! has! a! battery! tray! that! holds! two! (2)! CR2450! lithium! batteries.! A!
warning!message!appears!in!the!gage’s!display!when!the!batteries!need!to!be!replaced.!!
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To!change!the!batteries:!
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The!batteries!are!on!the!underside!of!the!tray.!!
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Step!3.!Remove!the!expired!batteries!and!place!the!new!!
batteries!positive!side!up!in!the!tray.!(The!current!Almen!!
gage!set-up!and!calibration!information!are!retained!when!!
the!batteries!are!replaced.)!Place!the!battery!holder!in!!
the!battery!compartment!and!push!it!in!until!it!locks!into!!
position.!
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Step!1.!Using!a!small!flat-blade!screwdriver,!carefully!
slide!the!blade!into!the!opening!and!release!the!
battery!holder.!Do!NOT!remove!digital!indicator!from!
the!gage.!
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Step!2.!Once!the!battery!holder!is!unlocked,!grasp!it!
with!your!fingers!and!pull!the!battery!holder!out.!
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Do!NOT!remove!the!digital!
indicator!from!the!gage!
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Electronics!Inc.!•!(574)!256-5001!•!www.electronics-inc.com!
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Calibration!
Periodic! calibration! of! the! Almen!gage! is! important! to! assure!
process!repeatability!and!accuracy.!The!gage’s!digital!indicator!
should! be! removed! and! calibrated! annually! or! sooner! if! it!
appears! to! be! damaged! or! inaccurate.! Use! of! a! standard!
calibration!stand!as!shown!is!recommended!or!you!may!return!
the!gage!to!Electronics!Incorporated!for!service.!!
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The!digital!indicator!should!be!re-installed!with!the!Zero!Block!
in!place!and!the!physical!position!of!the!indicator!adjusted!on!
the!frame!so!that!it!is!near!True!Spindle!Zero!±0.025!mm.!This!
assures! that! the! indicator! is! in! the! preferred! accuracy! range.!
!See!the!section!titled!“Checking!or!Setting!the!Spindle!Starting!
Position”!for!more!information.!
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Inspection!of!the!Gage!Head!
Examine!the!condition!of!the!back!post!for!wear,!which!may!
interfere!with!proper!seating!of!the!strip!onto!the!platform.!!
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Federal&Calibration&Stand&

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Digital!Indicator!Instruction!Manual!Information!
For!additional!information!on!the!digital!indicator,!please!refer!to!the!Mahr!Federal!Incorporated!Digital!Indicator!
Manual!included!with!the!gage.!If!missing,!the!manual!is!available!from!Electronics!Inc.!
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Computer!Interface!Device!Accessory!
Entering! multiple! measurements! is! quick! and! easy! with! the!
Computer!Interface!Device.!The! device!plugs!into! a!computer’s!
USB! port! and! pulls! the! value! displayed! on!the! Electronics!
Incorporated!Almen! Gage!directly! into! a! computer! program!
(Excel,! Word,! or! similar! software).! The! Computer! Interface!
Device! eliminates! data! entry! errors! and! accelerates! the!
measurement!process.!A!push-button!or!foot!switch!controls!the!
device.! There! are! no! power! requirements! as! the! device! is!
powered!from!the!USB!port!and!there!are!no!drivers!to!load.!!
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Cover&page&of&the&instruction&manual&for&the&Digital&Indicator&
The&Computer&Interface&Device&&
(part&number&999144)&&
(Does&not&include&an&Almen&gage)&

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Electronics!Inc.!•!(574)!256-5001!•!www.electronics-inc.com!
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Trouble!Shooting!the!Model!TSP-M!
If!the! TSP-M! Almen!Gage!indicator! display! is!flashing,!or! if!the! gage! will!not!zero,! or! the!resolution! needs! to!be!
changed,! the! following! instructions! will! return! the! gage! back! to! its! factory! default! settings! and! remedy! these!
conditions.!Perform!every!step—one!through!six—in!sequence!until!the!problem!is!resolved.!If!more!assistance!is!
needed,!please!call!Electronics!Incorporated!Customer!Service!Department!at!1-800-832-5653!(USA!and!Canada)!
or!(574)!256-5001.!
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Step!One!
•Press!M/OFF!and!the!inch/mm!button!at!the!same!time.!"M1"!will!appear!on!the!screen.!
•If!the!"R"!is!not!on!the!bottom!left!side!of!the!screen,!press!ZERO/ON!button!until!the!“R”!is!on!the!screen.!
•If!the!"X1"!is!not!on!the!bottom!center!of!the!screen,!press!the!inch/mm!button!until!“X1”!is!selected.!
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Step!Two!
Press!M/OFF!button.!"M2"!will!appear!on!the!screen!and!it!should!read!000.0000.!
•If!“-“!precedes!the!digits,!press!the!ZERO/ON!button!to!remove!it.!
•Press!the!inch/mm!button!to!move!the!cursor!over!to!the!first!non-zero!digit!to!be!changed.!
•Press!the!ZERO/ON!button!repeatedly!to!toggle!through!numbers!until!“0”!is!displayed.!Repeat!for!!other!
!digits!not!at!“0.”!
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Step!Three!
Press!M/OFF!button.!"M12"!will!appear!on!the!screen!and!it!should!read!000.0000.!
•If!“-“!precedes!the!digits,!press!the!ZERO/ON!button!to!remove!it.!
•Press!the!inch/mm!button!to!move!a!cursor!over!to!the!first!non-zero!digit!to!be!changed.!
•Press!the!ZERO/ON!button!repeatedly!to!toggle!through!numbers!until!“0”!is!displayed.!Repeat!for!other!
digits!!not!at!“0.”!
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Step!Four!
Press!M/OFF!button.!"M23"!will!appear!on!the!screen!and!it!should!read!000.0000.!
•If!“-“!precedes!the!digits,!press!the!ZERO/ON!to!remove!it.!
•Press!the!inch/mm!button!to!move!a!cursor!over!to!the!first!non-zero!digit!to!be!changed.!
•Press!the!ZERO/ON!button!repeatedly!to!toggle!through!numbers!until!“0”!is!displayed.!Repeat!for!other!
digits!!not!at!“0.”!
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Step!Five!
•Press!M/OFF!button.!"M13"!will!appear!on!the!screen.!This!is!the!Digital!Resolution!Mode!screen.!
•When!using!the!mm!mode!–!press!the!inch/mm!button!repeatedly!to!select!0.001.!
•When!using!the!inch!mode!–!press!the!inch/mm!button!repeatedly!to!select!0.0001.!
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Step!Six!
•Press!M/OFF!button!-!the!gage!will!be!in!run!mode.!
•Place!the!flat!side!of!the!curved!Zero!block!on!top!of!gage!and!press!the!ZERO/ON!button.!
•The!indicator!will!read!0.000!mm!if!in!metric!mode!or!0.0000!if!in!English!mode.!
•The!bottom!of!the!screen!will!read!"R!X1!mm"!or!"R!X1!in".!
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Step!Seven!
Check!the!Spindle! Starting!Position!to! ensure!it!is! in! the!preferred!range.!See! the!next!section!for! directions!on!
checking!or!setting!the!Spindle!Starting!Position.!
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Checking!or!Setting!the!Spindle!Starting!Position!
To!evaluate!the!Spindle!Starting!Position,!place!the!Zero!Block!on!the!gage!and!enter!the!gage!into!True!Spindle!
Mode!by!pressing!and!holding!the!ZERO/ON!button!for!three! (3)!seconds!(the!“X1”! will!disappear! when!in!True!
Spindle!Mode).!The!value!of!the!Spindle!Starting!Position!should!be!set!to!0.000!mm!+!0.025!mm!(0.0000!inch!+!
0.0010!inch).!If!the! Spindle!Starting!Position!is!out! of!tolerance,!reposition!the! indicator!on! the!frame!using!the!
instructions!below!or!call!Electronics!Incorporated!or!an!Authorized!Distributor!for!assistance.!
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Instructions:!
Be!sure!the!zero!indicator!block!is!in!place!and!then!loosen!the!8!mm!gland!nut!holding!the!indicator.!Adjust!the!
indicator!placement!on!the!frame!until!the!Spindle!Starting!Position!is!within!tolerance.!Carefully!tighten!the!gland!
nut!and!be!sure!the!indicator!is!secure.!It!should!not!move!or!rotate,!and!the!Spindle!Starting!Position!should!not!
change!as!the!gland!nut!is!tightened.!Place!a!dab!of!proof!lacquer!at!the! gland! nut!and! stem!as!a!tamper-proof!
seal.!
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Contacting!Electronics!Inc.!
Mailing!and!Shipping!Address:!
Electronics!Inc.!
56790!Magnetic!Drive!
Mishawaka,!IN!46545!USA!
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Telephone:!1-800-832-5653!(Toll-free!in!USA!and!Canada)!or!(574)!256-5001!
Fax:!(574)!256-5222!
Email:![e-mail]!
Website:!www.electronics-inc.com!
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Limited!Warranty!
The!warranty!obligations!of!Electronics!Inc.!for!the!TSP-M!are!limited!to!the!terms!set!forth!below.!
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Length!of!Warranty!Period!
This! limited! warranty! lasts! one! (1)! year! from! the! shipping! date! of! this! product! from! Electronics! Inc.! or! its!
authorized!distributor.!
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What!is!Covered!
This!limited!warranty!covers!defects!in!materials!and!workmanship!in!this!product.!
!
What!is!Not!Covered!
This!limited!warranty!does!not!cover!any!damage!or!deterioration!of!this!product!resulting!from!any!alteration!or!
modification,!improper!or!unreasonable!use!or!maintenance,!or!improper!handling!or!storage.!
!
How!to!Obtain!a!Remedy!Under!This!Limited!Warranty!
To!obtain!a!remedy!under!this!limited!warranty,!contact!Electronics!Inc.!or!distributor!from!whom!this!product!was!
purchased.!If!it!is!determined!that!this!product!must!be!returned!under!this!limited!warranty,!a!Returned!Goods!
number!(RG),!obtained!from!Electronics!Inc.,!will!be!required.!This!product!should!be!properly!packed,!preferably!
in! the! original! carton,! for! shipping.! Cartons! not! bearing! a! RG! number! will! require! additional! processing! time.!
Shipping!and!insurance!charges!must!be!prepaid;!Electronics!Inc.!is!not!responsible!for!these!expenses.!
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What!Electronics!Inc.!Will!Do!Under!This!Limited!Warranty!!
Electronics!Inc.!will,!at!its!sole!discretion,!provide!one!of!the! following!two! remedies!to!whatever!extent!it!shall!
deem!necessary!to!satisfy!a!proper!claim!under!this!limited!warranty:!
!
1)!Repair!the!product.!Electronics!Inc.!will!pay!the!shipping!costs!necessary!to!return!this!product!to!the!customer!
once!the!repair!is!complete.!
!
2)!Replace!this!product!with!a!comparable!current!model.!Electronics!Inc.!will!pay!the!shipping!costs!necessary!to!
replace!this!product.!
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Limitation!on!Liability!
The! maximum! liability! of! Electronics! Inc.! under! this! limited! warranty! shall! not! exceed! the! actual!purchase! price!
paid! for! the! product.! Electronics! Inc.! is! not! responsible! for! direct,! special,! incidental! or! consequential! damages!
resulting! from! any! breach! of! warranty! or! condition,! or! under! any! other! legal! theory! to! the! maximum! extent!
permitted!by!law.!
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Exclusive!Remedy!!
To!the!maximum!extent!permitted!by!law,!this!limited!warranty!and! the!remedies!set!forth!above! are! exclusive!
and!in!lieu!of!all!other! warranties,!remedies! and!conditions,!whether!oral!or!written,!express!or! implied.!To! the!
maximum!extent!permitted!by!law,!Electronics!Inc.!specifically!disclaims!any!and!all!implied!warranties,!including,!
without! limitation,! warranties! of! merchantability! and! fitness! for! a! particular! purpose.! If! Electronics! Inc.! cannot!
lawfully! disclaim! or! exclude! implied! warranties! under! applicable! law,! then! all! implied! warranties! covering! this!
product,!including!warranties!of!merchantability!and!fitness!for!a!particular!purpose,!shall!apply!to!this!product!as!
provided!under!applicable!law.!!
!
Rights!under!State!Law!
This!warranty!defines!specific!legal!rights!relative!to!these!products!provided!by!Electronics!Inc.!Legal!rights!may!
also!vary!from!state!to!state.!
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Electronics!Inc.!•!(574)!256-5001!•!www.electronics-inc.com!
13!
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Appendix!
Introduction!to!Correlation!
Almen!mini-strips!must! be! compared! to! standard-size! Almen! strips! to! assure! compliance! with! intensity!
measurement!practices.!The!comparisons!are!described!in!correlation!trials!where!the!standard!Almen!strip!is!used!
to!set!the!requested!intensity!and!the!mini-strip!is!presented!to!the!same!blast!stream.!It!is!important!to!document!
the! test! results,! especially! the! parameters! and! all! test! conditions.! Testing! multiple! strips! and! the! creation! of! a!
histogram!can!help!validate!the!process.!!
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The!Almen!Strips!and!Correlation!Holder!
It! is! convenient! to! peen! the! standard-size! Almen! strip!and! the! mini-strip! at! the! same! time! using! a! correlation!
holder.!There!are!two!methods!of!affixing!the!mini-strip!to!the!correlation!holder.!In!the!first!method,!two!screws!
secure! the! ends! of! the! mini-strip.! For! the! second! method,! double-sided! adhesive! tape! or! a! temporary! glue!
adhesive,!such!as!rubber!cement,!secures!the!mini-strip!to!the!holder.!The!second!method!is!used!only!when!it!is!
not!possible!to!attach!the!mini-strip!to!the!holder!with!two!screws.!!
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For!both!methods,!the!standard!Almen!strip!must!be!affixed!to!the!holder!with!four!screws.!
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The!first!image!below!shows!the!method!using!two!hold-down!screws!to!secure!the!mini-strip!to!the!EI!Correlation!
Holder!for!mini-strips!(Electronics!Inc.!part!number!970070).!The!strip!is!positioned!next!to!two!protruding!back-!
stops!to!help!keep!it!aligned.!In!the!second!image,!the!mini-strip!is!attached!to!the!holder!with!double-sided!tape.!
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It!is!very!important!to!use!only!one!method.!The!two!hold-down!screws!will!keep!the!strip!firmly!secured!to!the!
holder! during! the! blast! cycle! while! the! tape! or! glue! may! allow! some! lift-off! or! curvature.! This! curvature! may!
influence! the! mini! strip! response.! As! long! as! the! technique! is! consistent,! the! results! should! be! consistent.! A!
sufficient!number!of!trials!should!be!run!to!validate!the!procedure.!The!examples!shown!in!the!next!section!titled!
“Examples!of!Correlation”!use!multiple!trials!and!the!data!is!shown!in!a!statistical!capability!chart!(histogram).!!
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When!in!doubt,!run!more!tests!and!analyze!the!data!carefully.!!!
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Note:!When!using!tape!or!glue!to!affix!the!mini-strip!to!the!holder,!make!sure!the!tape!and!glue!are!completely!
removed!from!the!holder!and!strip!before!measuring!the!strip!or!reusing!the!holder.!
Two&screws&holding&a&mini-strip&in&place&
A&mini-strip&held&in&place&with&double-sided&tape.&This&
method& should& be& used& only& when& the& mini-strip&
cannot&be&attached&to&the&holder&with&screws.&&
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Electronics!Inc.!•!(574)!256-5001!•!www.electronics-inc.com!
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Examples!of!Correlation!
The!following!examples!of!correlation!between!standard-size!Almen!strips!and!mini-strips!are!for!illustration!only.!
Actual!correlation!must!always!be!done!on!a!job-specific!basis.!The!special!Almen!holder!for!correlation!uses!two!
screws!to!capture!the!mini-strip.!Other!methods!may!be!used! such!as!double-sided!tape!or! temporary!adhesive!
(e.g.,!rubber!cement).!For!best!results,!all!procedures!must!be!consistent.!When!in!doubt,!repeat!a!test.!!
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Test!
Standard!Strip!
x!.001!inch!
Mini!Strip!
x!.001!inch!
Graph!1!
3A!to!A!mini!(36)!samples!test!2!
3.26!A!
1.15!Mini!A!
Graph!2!
3A!to!A!mini!(36)!samples!
3.25!A!
1.25!Mini!A!
Graph!3!
3A!to!A!Mini!2!tests!
3.5!A!
3.26!A!
1.25!Mini!A!
1.15!Mini!A!
Graph!4!
6A!to!A!Mini!2!tests!
5.79!A!
5.95!A!
2.40!Mini!A!
2.46!Mini!A!
Graph!5!
6A!to!A!Mini!Test!2!
5.95!A!
2.46!Mini!A!
Graph!6!
6A!to!A!Mini!
6.09!
2.40!Mini!A!
Graph!7!
12A!to!A!Mini!and!N!Mini!
12.08!A!
5.68!Mini!A!
18.40!Mini!N!
Graph!8!
12A!to!A!Mini!
12.32!A!
4.93!Mini!A!
Graph!9!
12A!to!A!Mini!
12.08!A!
5.68!Mini!A!
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Note:!These!examples!are!for!illustration!only.!Differences!in!machine!design,!nozzle!type!and!placement,!type!and!
size!of!media,!and!media!condition!can!affect!results.!Document!what!you!do!and!do!what!you!document.!When!in!
doubt,!repeat!a!test.!Keep!accurate!records!of!every!test.!Use!a!curve!solver!certified!to!SAE!J2597.!Place!the!mini-
strip!on!the!gage!multiple!times!to!assure!the!reading!is!consistent.!!
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Do! not! rely! upon! these! examples.! We! do! not! warrant! that! these! examples! will! be! appropriate! for! your!
applications.!Create!your!own!correlation!studies.!!
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Electronics!Inc.!•!(574)!256-5001!•!www.electronics-inc.com!
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Graph!1!-!3.26!A!to!1.15!Mini!A!
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Graph!2!-!3.25!A!to!1.25!Mini!A!
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Graph!3!–!3.5!A!to!1.25!Mini!A,!3.26!A!to!1.15!Mini!A!
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Graph!4!-!5.79!A!to!2.40!Mini!A,!5.95!A!to!2.46!Mini!A!
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Electronics!Inc.!•!(574)!256-5001!•!www.electronics-inc.com!
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Graph!5!-!5.95!A!to!2.46!Mini!A!
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Graph!6!-!6.09!A!to!2.40!Mini!A!
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