Gerima SMA 20?P 62 User manual

1 V62.1.2.27.09.10.ENG
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OperatingManual
SMA20‐P62
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GERIMASMA20‐P62

2 V62.1.2.27.09.10.ENG
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DearCustomer,
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Congratulations,youhavepurchasedahigh‐
qualitybevelmillingmachinethatwillhelpyou
toachieveoutstandingresultsinyourhandbev‐
ellingapplications.
Toensurethatthemachineisusedsafelyand
effectively,pleasereadthisoperatingmanual
carefullyinordertobecomeproperlyac‐
quaintedwiththetool.Pleaseinstructyourco‐
workersandemployeessothattheyalsobe‐
comeacquaintedwiththemachine.Learningto
usethemachineproperlywillsaveyoutimeand
money,willsaveyouremployeestimeandef‐
fort,andwillimprovethequalityofyourprod‐
ucts.
Yourmachinewassubjectedtothoroughinspec‐
tionandtestingbeforebeingpackedand
shipped.
Shouldyouneedtocontactusforassistance,
pleasealwayshavethemachineidentification
numberavailable.
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Themachineidentificationnumberisprinted
onthemachine’sratingplate.
Themachineidentificationnumberisalso
engravedonthegearhousing.
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1.Operatingissues
Ifyouhavequestionsregardingtheuseoropera‐
tionofthemachine,orifyouneedoursupportor
adviceregardingspecializedapplications,ourteam
ofspecialistretailersandapplicationtechnicians
wouldbepleasedtooffertheirassistance.
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2.Servicingandrepairissues
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Ifyouneedtomakeaguaranteeclaim,ifthema‐
chineneedstoberepairedorifyouneedtoorder
spareparts,pleasecontactourspecialistretailers
forhelp.
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3.Sales
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Ourspecialistretailersarealsothepeopletocon‐
tactifyouwishtopurchaseadditionalGERIMA
machines,accessoriesorconsumableitems.
Tohelpusprovidequickandefficientassistance,
pleasealwayshaveyourmachineidentification
numbertohand.
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Wehopeyouenjoyworkingwithyourprecision‐
madeGERIMAmachine.
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TheGERIMATeam
Machineidentificationnumber
Machine‐No.
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3 V62.1.2.27.09.10.ENG
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1.Quickreferenceguide
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2.Safetyinformation   
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3.Descriptionofmachine  
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4.Machineadjustments
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5.Machineoperation
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6.Maintenance
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7.Replacingthemillingheadand
guidebearing
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8.GERIMAspareparts
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9.Consumables
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10.Spareandwearingparts
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11.Guarantee
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12.ECDeclarationofConformity 
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Adjustingthebevelheight  4
Changingthemillinghead  4
Changingtheguidebearing5
Replacingtheindexableinserts 5
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Generalsafetyinformation  6
Specificsafetyinstructions  7
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Functionalcomponents  8
Intendeduse    8
Technicaldata    9
Power‐ontime    11
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Adjustingthebevelheight  12
Indexablecuttinginsertsformilling 
bevels13
Indexablecuttinginsertsforradius
milling14
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Workingwiththemachine  21
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Maintenanceplan   23
Servicing24
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Changingthemillingheadandthe
DL/DSguidebearings   26 
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Radiusmillingcutter   28
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Overviewofindexablecuttinginserts29
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Gearunit30
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Pneumaticmotor    32
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Guarantee35
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ECDeclarationofConformity 36
Contents

4 V62.1.2.27.09.10.ENG
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Quickreferenceguide
Separateairconnection
1.Quickreferenceguide
Workingdirection:
Alwaysmillagainstthedirectionofrotationof
themillinghead(‘up‐cutmilling’)
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MovemachineONLYinthedirectionofthe
arrow!
Adjustingbevelheight(a):
Thebevelheight(a)–seepage12–issetbyad‐
justingtheheightofthemachine’sguideplate.
Theheightsettingcanbereadfromthefixed
mainscaleandtheverniercollar.
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1.Releaseclampingscrew
2.Rotatetheguideplate untiltherequired
bevelheighthasbeensetasshownbythe
fixedmainscaleincombinationwiththe
verniercollar.
3.Re‐tightenlockingscrew.
4.Checkbevelheightonworkpieceandreadjust
asnecessary.
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Changingthemillinghead:
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On/Off
2
1
3
2

5 V62.1.2.27.09.10.ENG
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Quickreferenceguide
Separateairconnection
Changingtheindexableinserts:

6 V62.1.2.27.09.10.ENG
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Safetyinformation
2.Safetyinformation
Generalsafetyinformation:
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Beforeusingthemachine,theoperatingmanual
andsafetyinformationmusthavebeenreadand
understoodintheirentirety.Theinstructions
containedthereinmustbefollowed.
Theseoperatinginstructionsarebasedonthe
relevantpartsoftheEuropeanMachinery
Directive(98/37/EC)andtheCENTC255
regulations“Hand‐held,non‐electricpowertools
–Safety”.
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Theseinstructionscovertheoperationandhan‐
dlingofthemachine,includingtools,accessories
andmachinemaintenance.
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Failuretocomplywiththeseestablishedsafety
recommendationscancauseserioushazards.
Themachineoperatormusthaveproperlyun‐
derstoodthefollowingsafetyadviceandmust
haveaccesstotheseinstructionsatalltimes.
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Topreventimproperhandlingofthemachine
andtopreventaccidents,theoperatormust
complywiththesafetyprecautionssetoutbe‐
low.
Installation:
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Complywiththespecificationsregarding
compressedairquality,whicharecontainedin
theoperatinginstructionssuppliedwiththe
machine.
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Onlyusetherecommendedlubricants.
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Checkpneumatictubingandairpressure.When
themachineisrunning,theairpressureatthetool
inletshouldnotexceed7bar(=700kPa=100psi),
oralowermaximumoperatingairpressureif
specified.
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Avoidhazardsassociatedwithvibrating
pneumatictubing.Checktheconditionofthe
tubing,tubeconnectorsandtubeclamps
regularly.
Makesurethattheexhaustairventispositioned
sothatdustorairdrawnfromtheworkpieceisnot
directedtowardtheoperatororanyotherperson.
Asafetyscreenshould,ifpossible,bepositioned
betweentheoperatorandthe
workpiece.
Pneumatically‐drivenpowertoolsaregenerally
notinsulatedinawaythatwouldallowthemto
comeintocontactwithanelectricalpowersource.
Ifanexplosionhazardexists,usesomeother
machiningtechniquethatdoesnotgenerate
sparksinordertoavoidpersonalinjuryor
damagetopropertyfromfire.
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Alwaysdisconnecttheairsupplytubefromthe
machinebeforeservicingorcarryingout
maintenanceonthemachine.
Beforeeachuse,alwaysinspectthepneumatic
tubingforsignsofwearordamage.
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• Servicingandtestingmustonlybecarried
outbyappropriatelyqualifiedtechnicians.

7 V62.1.2.27.09.10.ENG
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Safetyinformation
Specificsafetyinstructions:


Warning
Riskofinjurytohands!

• Donotplaceyourhandnearthemilling
head.
• Alwaysholdthemachinewithtwohands.
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Caution

Improperusecandamageequipmentand
property!

• Riskofmachinebeingdamagedorde‐
stroyed.
• Neverliftorcarrythemachinebyits
powercable.
• Makesurethecableisdirectedbehind
andawayfromthemachine.Donotlay
thecableoversharpedges.
• Servicingandtestingmustonlybecarried
outbyappropriatelyqualifiedtechnicians.

• AlwaysusegenuineGERIMAspare
partsandaccessories.

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  Warning

Riskofinjuryfromhotmetalchips
• Hotchipsareejectedfromthemachineat
highspeed.
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• Usethechipbin.
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Warning

Improperusecancauseseriousinjury!

• Makesureyoualwayshaveafirmfooting
whenworkingwiththemachine.
• Nevertouchthemillingheadwhenthema‐
chineisrunning.
• Neverusethemachineaboveheadheight.
• Themachineshouldonlybeusedforcon‐
ventionalup‐cutmilling.
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  Important

Themanufacturerreservestherighttomake
technicalchanges.

8 V62.1.2.27.09.10.ENG

3.Descriptionofmachine



1Airconnection
2Air‐Motor
3Mainscale
4Guideplate
5 Grip



Toavoidinjuryanddamagetohealth,please
observethefollowing:

Themachinemayonlybeusedforworkand
materialsdescribedinthesection‘Intended
use’.

Donotusethemachinetoworkon
materialscontainingasbestos!




6Spindlelock
7Millinghead
8guidebearing(DL)
9Heightclampingscrew
10 Paddleswitch(starterlever)

Intendeduse:

TheGERIMASMA20‐Pisahand‐held,pneumati‐
callydrivendeviceintended:

• formachiningworkpiecesmadeofsteel,
caststeel,fine‐grainedsteel,stainless
steel,aluminium,aluminiumalloys,brass
andplastics;
• forcommercialuseinindustrialsettings
andintheskilledtrades;
• forpreparingK,V,XandY‐shapedwelding
grooves;
• forcreatingvisibleedgesinplantandme‐
chanicalengineeringwork;
• foredgeroundingtopreparematerialsfor
paintingorcoatingorasimpactprotection

Functionalcomponents
1
2
35
4
6
789
10

9 V62.1.2.27.09.10.ENG

SMA20‐P62

6‐7bar

20l/s


800W


8.0001/min


2,5kg




1‐10mm

1‐4mm


1,5mm


12‐20,0mm


30‐40mm


2‐3mm








Themanufacturerreservestherighttomake
technicalchanges.
Technicaldata
Technicaldata:

Airpressure

Requiredairflowrate


Ratedpowerconsumption


Motorspeedwhenidling


Weight(approx.)


Bevelwidth(material‐dependent)

Aluminium

Steel


Minimumthicknessofworkpiece


Smallestcontourradius(bevel‐dependent)


Smallestborediameter(bevel‐dependent)


Edgeradius








Donotoverload!(seepage11)

10 V62.1.2.27.09.10.ENG

Noiseemissionvaluesinaccordancewith
theDINEN60745‐1standard

Vibrations:
Note:

Themeasuredvalueslistedabovedependonthe
materialsandoperatingproceduresusedandmay
thereforebeexceededunderotheroperating
conditions.
Usingthemachinetocreatebevelswithawidth
greaterthanthatpermittedwillresultinadispro‐
portionallylargereductioninthemachine’son‐
timeandtheservicelifeoftheindexablecutting
inserts.Thevibrationandnoiseemissionvalues
willincreaseaccordingly.
Noiseemissions
Vibrations
Noiseemission
Emissionsoundpressurelevel(inidlemode,speedset‐
Peakemissionsoundpressurelevelatworkplace
(duringmillingoperations)
Soundpowerlevel
Totalvibrationvalue
(tri‐axialvectorsum)
Workprocess:
‐30°millinghead‐(45°millingheadforRadius)
‐2mmbevelwidth(C)in12mmsteelsheet(S355)
RadiusR2Radiusin12mmsteelsheetS355
‐pressure6to7bar
Totalvibrationvalue
(tri‐axialvectorsum)
Workprocess:
‐45°millinghead‐
‐3mmbevelwidth(C)in12mmsteelsheet(S355)
RadiusR3Radiusin12mmsteelsheetS355
‐pressure6to7bar
ValueUncertainty
LpAindB(A)833
LpGpeak1013
LWAindB(A)943
Measuredvibrationemissionvalueah=
2,50m/s²
UncertaintyK=1.5m/s²
DeterminedasperEN60745:

























Thepower‐onperiodslistedonpage11have
takenthevibrationvaluesintoaccount.
Topreventoverloadingthemachineandtoavoid
operatorfatigueitisveryimportanttoobserve
themaximumpower‐onperiodsespeciallywhen
machiningwidebevelsorhigh‐strengthmaterials.



Measuredvibrationemissionvalueah=
3,0m/s²
UncertaintyK=1.5m/s²
DeterminedasperEN60745:


11 V62.1.2.27.09.10.ENG



Thecompressedairthatpowersapneumatic
drivealsoservestocoolthemotoraswell.Pneu‐
matictoolscanthereforebeoperatedforlonger
periodsthanelectricallypoweredtools.
However,ifthemachineissubjectedtoparticu‐
larlyextremeloads(e.g.whenmachiningwide
bevelsorveryhardortoughmaterials)and/orif
themachineisrunforverylongperiods,theair
coolingmaystillbeinsufficienttopreventover‐
heatingofthemillingdriveunit.Iftheoperator
continuestousethemachine,themillingdrive
unitmayoverheatandbedamagedasaresult.





Donotoverloadthemachine!

Themachinecanbecomeoverloadedif,forex‐
ample,itcontinuestobeusedeventhoughthe
bevelbeingcutistoolargeforthematerialbe‐
ingmilled,orifthecuttinginsertshavebecome
bluntandthereforeunabletopenetratethema‐
terial.

Thepower‐ontimeisalwaysexpressedasa
percentageofonehour.
Example:
Ifthepower‐ontimeisspecifiedas50%,thenyou
canusethemachinetomillbevelsforamaximum
of30minutesinanhourandmustthenleavethe
machinetocoolfor30minutes.Ifthemachineis
subjectedtoheavyloads,thepower‐ontime
mightbe20%,whichmeansitcanbeusedfor
12minutesinanyhourandmustbelefttocoolfor
48minutes.










Suchconditionscanleadtoexcessivemachinevi‐
brationsorevenmachinefailure.Topreventthis
sortofdamagewhenmillinglargebevelsand/or
hardmaterials,nevertrytomachinethebevelina
singlepass,alwaysusemultiplepasses,
anddonotforgettochangethecuttinginserts
beforetheybecomebluntorworn.


Power‐ontime
Materialstrength
Aluminium,copper,brassorplastics
Steelupto400N/mm²
Steelupto600N/mm²
Steelupto900N/mm²
Power‐ontime
80%
60%
50%
40%
—————————————————————————————————————

12 V62.1.2.27.09.10.ENG












alengthofadjacentleg=bevelheight(a)
blengthofoppositeleg=bevelheight(b)
Cbevelwidth
αbevelangle
βoppositeangle
Avolumeofmaterialremoved
hbeveldepth
Sbase
tmaterialthickness


Thebevelheight(a)issetbyadjustingtheposition
oftheguideplate.Theheightsettingcanberead
fromthefixedmainscaleandthevernier
collar
Releaseclampingscrew
Rotatetheguide‐plateunituntiltherequired
bevelheighthasbeensetasshownbythefixed
mainscaleincombinationwiththevernier
scaleonthecollar.
Re‐tightenclampingscrew





Oncethebevelheighthasbeenset,abevelshould
bemilledonatestsampletocheckwhetherfur‐
therheightadjustmentsarerequired.Thesemay
benecessarybecausetheprecisionofthescaleis
approximately±1mm,dependingonthetypeof
millingheadfitted.
Adjustingthebevelheight
3
4
9
Materialandten‐
silestrength

Bevelheight(a)Bevelwidth
α=30°α=45°c
mmmmmm
Aluminium 1-8,7 1-7,1 1,2-10
Steelupto 1-3,5 1-2,8 1,2-4,0
Steelupto 1-2,6 1-2,1 1,2-3,0
Steelupto 1-1,7 1-1,4 1,2-2,0
Materialandten‐
silestrength

3
9
4
3
9
4.Machineadjustments













Thevaluesspecifiedaretypicalbutwithoutim‐
pliedguarantee.
Insomematerials,flame,plasmaandlasercut‐
tingtechniquescanleadtohardeningofthe
edgesoftheworkpiecebeingmachined.Thiscan
resultinsignificantdeviationsfromthespecified
referencevalues.











13 V62.1.2.27.09.10.ENG

Eight‐foldindexablecuttinginserts:

Theeight‐foldindexablecuttinginsertsarethe
actualtoolsthatperformthebevellingandde‐
burringoperations.Theycanbeusedtomachine
plastic,steel,stainlesssteelsandnon‐ferrous
metalssuchascopperaluminiumandbrass.
Theyaresuitableforcuttingbevelswithangles
of30°or45°.





OuruniversalB02coatingisausefulgeneral‐
purposecoatingthatcancopewithalltheabove
materials.

Wealsoofferinsertswithspecialcoatingsforma‐
chiningothermorespecializedmaterials.Please
contactusfordetails
Indexablecuttinginsertsformillingbevels
Indexablecuttinginsert
Type
PlasticM
Aluminium,copper
orbrassM
Steelupto400N/
mm²M
Steelupto600N/
mm²M
Steelupto900N/
mm²M
 
Materialstrength
Typeofcoating

B 00

B 00

B 02

B 02

B 05


14 V62.1.2.27.09.10.ENG

Adjustingtheeight‐foldindexable
cuttinginserts:

Locatinghole1
Locatinghole2
Indexablecuttinginsertsformillingbevels
1
2






CAUTION!
Itisextremelyimportanttoensure
thatthelowercornerofthe
cuttinginsertisalwayscoveredby
theguidebearingDLorDS.

Thecuttinginsertsformillingedgesmustbefas‐
tenedtothemountingseatonthemillingheadby
meansoftheoriginallockingscrews(max.tighten‐
ingtorque:4.0–5.0Nm).
Aseachinserthasfourcuttingedges,itcaneach
beindexedatotaloffourtimesbeforerequiring
replacement.

Astheinsertsareeachapproximately11mmlong,
eachinsertcanbeindexedfourtimeswhilefas‐
tenedviathelowerlocatingholeandafur‐
therfourtimeswhilefastenedviathemiddlelo‐
catingholeprovidedthatthewidthofthe
bevelbeingcutislessthanorequalto5.0mm.
Therefore,ifthewidthofthebevelsbeingmilledis
notgreaterthan5mm,eachinsertcanbeuseda
totalofeighttimesbeforerequiringreplacement.

Tofacilitatethemillingoftightcontoursandsmall
bores,asmallguidebearing(DS)isalsoavailable
asanaccessorytoeachmillinghead.WhentheDS
guidebearingisfitted,thecuttinginsertscanbe
usedatotaloffourtimes.

15 V62.1.2.27.09.10.ENG

Positioningofinsertsonthemillinghead:
ThetypeMindexableinsertshavefourcutting
edgeseach11mmlong.Ournewtechniqueof
‘rotating,flippingandshifting’theinsertsmakes
itpossibletoindexeachinserteighttimesifma‐
chiningbevelswithwidthsofuptoabout5mm.
Ifmachiningbevelwidthsgreaterthan5mm,
thecuttinginsertscanbeindexedfourtimesin
total.









LargeguidebearingDLfittedtomillingheadand
cuttinginsertsfastenedvialocatinghole1.This
configurationcanbeusedtomillbevelswith
widthsofupto5.0mm.











LargeguidebearingDLfittedtomillingheadand
cuttinginsertsfastenedvialocatinghole2.This
configurationcanbeusedtomillbevelswith
widthsofupto5.0mm(eight‐foldindexingof
insertpossible)orformillingbevelswithwidths
ofupto10.0mm(four‐foldindexingofinsert).

















ThesmallguidebearingDSisusedformillingcon‐
toursanddrilledholeswithdiameters≥45mm
andforbevelwidthsintherange1–10.0mm






Indexablecuttinginsertsformillingbevels
3
1
2
Largeguidebearing
DL
Largeguidebearing
DL
smallguidebearing
DS

16 V62.1.2.27.09.10.ENG

Eight‐foldindexableradius‐millinginserts:

Thenewindexableinsertsusedforradiusmilling
operationscanalsobeindexedatotalofeight
timesbeforerequiringreplacement.Theycanbe
usedformachiningplastic,steel,stainlesssteel,
aswellasnon‐ferrousmetalssuchasaluminium,
copperandbrass.












Indexablecuttinginsertsforradiusmilling
Radius
2 3
Typeofcoating
B00B00
B02B02
B02B02
B05B05
Type
RM

Aluminiumandaluminiumalloysupto
250N/mm²
Steelupto400N/mm²
Steelupto600N/mm²
Steelupto900N/mm²
Materialstrength

17 V62.1.2.27.09.10.ENG

Radius:2.0mmand3.0mm
Theindexableradius‐millinginsertsRM2and
RM3aredesignedwitheightcuttingedges.Our
newtechniqueof‘rotating,flippingandshifting’
theinsertsmakesitpossibletoindexthesecut‐
tinginsertsatotalofeighttimes.
Alwaysusetheoriginallockingscrewstofasten
theradius‐millinginsertstothemountingseat
onthemillinghead(max.tighteningtorque:4.0–
5.0Nm).
















Radius‐millinginsertsfastenedvialocating
hole1canberotatedandflippedatotaloffour
times.



Whenperformingradiusmillingwork,itisessen‐
tialthatthecorrectguidebearingisattachedto
themillinghead.
.






Radius2mm/RM2 Radius3mm/RM3











Aftershiftingtheradius‐millinginsertsfromlocat‐
inghole1tolocatinghole2,theinsertscanthen
berotatedandflippedafurtherfourtimes.










WiththesmallguidebearingDSfitted,smallerin‐
nercontoursorsmallerdiameterdrillholescanbe
milled.
Inthiscase,however,theradius‐millinginsertscan
onlybeindexedatotaloffourtimes.
Indexablecuttinginsertsforradiusmilling
Largeguidebearing
DL
Largeguidebearing
DL
Smallguidebearing
DS

18 V62.1.2.27.09.10.ENG








Standard








Alternativ












Important!
Toensuretheproperformationoftheradiuson
theworkpieceendface,themachinemustbe
fittedwithcorrectguidebearing.
Toensurethesmoothandprecisetransition
fromthemilledradiustotheuppersurfaceof
theworkpiece,theheightoftheguideplate
mustbesetprecisely.
IndexablecuttinginsertsformillingbevelsM
IndexablecuttinginsertsforradiusmillingRM3
≤5mm=8‐fold
>5mm=4‐fold
RM3=8‐fold
1‐10mm=4‐fold
RM3=4‐fold
DL=large
DS=small
MillingheadMH‐45/R3‐AB33.1
Tomill45°bevels,combinewithaDL‐45/R3‐B33‐1
guidebearingandfittypeMindexablecuttingin‐
serts.Tomill3mmradii,combinewiththesame
guidebearingbutfitRM3radius‐millinginserts.
45°bevel,largeguidebearingDL
CombiningthelargeDL‐45/R3‐B33.1guidebearing
withtypeMindexablecuttinginserts,enablesthe
insertstobeindexedatotalofeighttimesifthe
bevelwidthsbeingmachinedare≤5mm,orin‐
dexedfourtimesifthebevelwidthsare>5mm.

or
Radius:3.0mm
ThesameDLguide‐bearingisusedwiththeeight‐
foldindexableRM3radius‐millinginserts.


45°bevel,smallguidebearingDS
IfthesmallDS‐45/R3‐B33.1guidebearingiscom‐
binedwithtypeMindexablecuttinginserts,the
insertscanbeindexedfourtimesifthebevelbe‐
ingmachinedisbetween1and10mmwide.
or
Radius:3.0mm
ThesameDSguide‐bearingischosenwhenthe
RM3radius‐millinginsertsareusedformilling
tightcontoursorsmallerdiameterdrillholes.In
thiscasetheinsertscanbeindexedatotaloffour
times.


19 V62.1.2.27.09.10.ENG

Adjustingtheradii:
Pleasenotethatonlythepositionoftheupper
edgeoftheradiuscanbeadjustedbyrotating
theguideplate.Thelateralpositionoftheradius
ontheworkpieceendfaceisdeterminedbythe
guidebearingfittedandcannotbealtered






Guideplatesettoolow
(Radiusincomplete)













Guideplatesettoohigh
(Radiuscutsintomaterial)
















Guideplatesetcorrectly
(Radiusfullyformedwithsmoothtransitionto
workpiecesurfaces)


Indexablecuttinginsertsforradiusmilling
toolow
toohigh
correct

20 V62.1.2.27.09.10.ENG

>90°
Notesonradiusmilling:
Choosingtherightguidebearingtoensurethe
correctlateralpositionoftheradiusisjustas
importantassettingthecorrectheightofthe
guideplate.
Ifthewrongguidebearingisused,themachined
radiuswillnotformasmoothtransitionwiththe
endfaceoftheworkpiece.
Iftheguidebearingusedistoolarge,theap‐
pearanceoftheresultingradiusissimilar(but
rotatedby90°)tothatcreatedwhentheguide
plateissettoolow.
Iftheguidebearingusedistoosmall,theap‐
pearanceoftheresultingradiusissimilar(but
rotatedby90°)tothatcreatedwhentheguide
plateissettoohigh.
Thesamephenomenonarisesiftheendandup‐
perfacesoftheworkpiecearenotalignedat
rightanglestooneanother.

Iftheedgeoftheworkpiecetobemachinedwas
createdbycuttingalargerplatewithaplasma
cutter,theupperandendfacesoftheworkpiece
maybeoutofrectangularalignmentbyasmuch
as7°.Thistypeofmisalignmentwillresultina
radiusthatiseitherincompleteorthatcutstoo
farintothematerialdependingonwhetherthe
upperorlowersurfaceoftheworkpieceisbeing
machined.


Althoughourconicallyshapedguidebearings
aredesignedtobuttupagainsttheworkpiece
immediatelybelowthecuttinginsertsandcan
thereforeminimizetheproblem,theycannot
eradicateitentirely.
Machiningacorrect
radiusthereforerequires
a90°anglebetweenthe
adjacentfacesoftheworkpiece.







Guidebearingtoolarge(radiusincomplete)







Guidebearingtoosmall(radiuscutsintomaterial)









Anglegreaterthan90°(radiusincomplete)







Anglelessthan90°(radiuscutsintomaterial)
Indexablecuttinginsertsforradiusmilling
<90°
toosmall
toolarge