CHESTER Cobra Mill Manuel utilisateur
Contents
1. Introduction 2
2. Health&Safety 35
3. MachineSpecification 67
4. Operation 89
5. Controls 10
6. PartDiagrams&Lists 1113
7.CircuitDiagram 1415
8. GuideToMilling 16
ChesterUKCobraMill
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Introduction
ChesterUKLimitedisaspecialistcompanythathasbeensupplyingthemachinetoolindustryfor
over15years.TheChesterUKHeadOfficecomprisesofa30,500sq.ftfactorycompletewithofficesand
a showroom. Specialisingin conventional machine tools, Chester has built a reputation for quality and
reliability,whichishighlyregardedinthemachinetoolindustryandthemodelengineeringmarket.
Thereareseveral divisionswithinthecompany;Export,Education, ModelEngineering &UKSales,all
withdedicatedsalespersonnelwhoaretrainedtoansweryourquestions.
When buying from Chester you can be assured of a complete backup service with mechanical and
electricalengineersthatareavailabletogiveadviceifrequired.
StockisalargepartofanybusinessandChesterhavealwaysinvestedsubstantiallyinbuildingalarge
quantity of machines and spares, ready to satisfy customer requirements. Chester UK has one of the
largest stocks ofconventionalnew machines andaccessories within Great Britain. Pleasetake time to
visitourwebsite: www.chesteruk.net
ChesterUKCobraMill
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Health&Safety
Aswithallmachinerytherearecertainhazardsinvolvedwiththeoperationanduseofthelathe.
Using the machine with respect and caution will considerably lessen the possibility of person injury.
However, if normal safety precautions are overlooked or ignored, personal injury to the operator may
result.
Thismachinewasdesignedforcertainapplicationsonly.Westronglyrecommendthatthemachineisnot
modified,and/orusedforanyapplicationotherthanwhichitwasdesigned.Ifyouhaveanyquestions
relativetoitsapplicationdonotusethemachine,untilyouhavefirstbeenincontactwithChester
UK.
The lathe may not arrive with a power socket or plug. In the event of this happening, please inform
ChesterUKonTel:(01244)531631.
Safetyrulesforalltools
User
1. Wearcorrectapparel
Nolooseclothing,gloves,rings,braceletsor otherjewellerytoget caughtinmovingparts.Non
slipfootwearisrecommended.Wearprotectivehaircoveringtocontainlonghair.
2. Alwaysweareyeprotection
Refer to ANSLZ87.1 standard for appropriate recommendations. Also use face and / or a dust
maskifthecuttingoperationisdusty.
3. Don’toverreach
Keepaproperfootingandbalanceatalltimes.
4. Neverstandonatool
Seriousinjurycouldoccurifthetoolistippedorifthecuttingtoolisaccidentallycontacted.
5. Neverleavethetoolrunningunattended
Turnpoweroff.Leavetooluntilitcomestoacompletestop.
6. Drugs,alcoholandmedication
Donotoperatethetoolwhileundertheinfluenceofdrugs,alcoholoranymedication.
7. Makesurethetoolisdisconnectedfromthepowersupply
Whilemotorisbeingmounted,connectedorreconnected.
8. Always
Keephandsandfingersawayfromanymovingparts.
9. Stop
Themachinebeforemovingchips.
10.Shutoff
Powerandcleanthelatheandworkareabeforeleavingthemachine.
Useofthemachine
1. Removeadjustingkeysandwrenches
Form a habit of checking to see that keys and adjusting wrenches are removed from the tool
beforeturningit‘on’.
2. Don’tforcethetool
Itwilldothejobbetterandbesaferattherateforwhichitwasdesigned.
3. Usetherighttool
Don’tforcethetoolorattachmenttodoajobforwhichitwasnotdesigned.
4. Securework
Useclampsoravicetoholdworkwhenpractical.It’ssaferthanusingyourhands,andfreesboth
tooperatethemachine.
ChesterUKCobraMill
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5. Maintaintoolsintopcondition
Keeptoolssharpandcleanforthebestandsafestperformance.Followinstructionsforlubricating
andchangingaccessories.
6. Userecommendedaccessories
ConsultChesterUKforrecommendedaccessories.Theuseofimproperaccessoriesmaycause
hazards.
7. Avoidaccidentalstarting
Makesuretheswitchisinthe‘OFF’positionbeforeplugginginpowercord.
8. Stop
Themachinebeforeputtingmaterialinthevice.
9. Always
Havestockfirmlyclampedinthevicebeforestartingthecut.
10. Groundalltools
If the tool is equipped with a threeprong plug, it should be plugged into a threehole electrical
receptacle.Ifanadapterisusedtoaccommodateatwoprongreceptacle,theadapterplugmust
beattachedtoaknownground.Neverremovethethirdprong.
Adjustment
Make all adjustments with the power off.When assembling follow the manuals instructions, this
willensurecorrectinstructionandasafestructure.
Workingenvironment
1. Keeptheworkareaclean
Clutteredareasandbenchesinviteaccidents.
2. Don’tuseinadangerousenvironment
Don’tusepowertoolsindamporwetlocations,orexposetorain.Keeptheworkareawelllit.
3. Keepchildrenetcatasafedistance.
Allchildrenetcshouldbekeptatasafedistancefromtheworkarea.
4. Don’t
Install&usethismachineinanexplosivedangerousenvironment.
Maintenance
1. Disconnect
Machinefromthepowersourcewhenmakingrepairs.
2. Checkdamagedparts
Beforefurtheruseofthetool,aguardorotherpartthatisdamagedshouldbecarefullycheckedto
ensure that it would operate properly and perform its intended function check for alignment of
movingparts,bindingofmovingparts,breakageofparts,mountingandanyotherconditionsthat
may affect its operation. A guard or other part that is damaged should be properly repaired or
replaced.
3. Disconnecttools
Beforeservicingandwhenchangingaccessoriessuchasbladesbits,cutters,etc.
4. Toprevent
Thecorrosionofmachinedsurfaceswhenasolubleisusedascoolant,payparticularattentionto
wipingdrythesurfaceswherefluidaccumulatesanddoesnotevaporatequickly,suchasbetween
themachinebedandvice.
ChesterUKCobraMill
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SafetyDevice
1. Interlockswitchonpulleycover.Assoonasthepulleycoverisopen,themachinewillcometo
a stop with the function of this switch. Do not remove this switch from the machine for any
reason,andcheckit’sfunctionfrequently.
2. Interlockswitchoncuttingarea.Assoonasthepulleycoverisopen,themachinewillcometo
a stop with the function of this switch. Do not remove this switch from the machine for any
reason,andcheckit’sfunctionfrequently.
ChesterUKCobraMill
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MachineSpecification
DrillingCapacity 10mm
EndMillingCapacity 10mm
FaceMillingCapacity 20mm
SpindleStroke 30mm
Throat 140mm
TableWorkingSurface 145x240mm
LongitudinalTravel 180mm
CrossTravel 90mm
Max.DistanceSpindleToTable 220mm
No.OfSpindleSpeeds Variable
RangeOfSpeeds 1002000rpm
SpindleTaper MT2
Motor 150W
Supply 240V
Weight(nw/gw) 25/38kg
Dimensions(LxWxH) 480x380x680mm
ChesterUKCobraMill
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Features
1.Forward/Off/ReverseSwitch 2.VariableSpeedControlKnob 3.FuseBox
4.PowerLight(Green) 5.YellowLight(only110V) 6.HighLowChangeKnob
7. 8.FineFeedingHandwheel 9.
10.WorkTable 11.CrossFeedHandwheel 12.LongitudinalFeedHandwheel
13.Handle 14.LiftingHandwheel 15.DCMotor
ChesterUKCobraMill
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Operation
InstallationOfTheTaperedShank
1. Disconnectfromthemainpowersupply,beforeyoureplacethecutter.
2. Removetheprotectivecover(a).
3. Wipethespindlesleeveandtapershank.
4. Putthetapershank(i)intothespindlesleeve.Mattthecutterwithanoilcloth.
5. Usea#14openendwrench(c),turningthespindledrawbar(clockwise)(b),inordertosecure
thetaperedshank.
6. Pulloutthefixingpin
7. Installtheprotectivecover(a).
RemovalOfTheTaperedShank
1. Disconnectfromthemainpowersupply,beforeyoureplacethecutter.
2. Removetheprotectivecover(a).
3. Usea#14openendwrench(c),toloosenthespindledrawbar(counterclockwise)(i),inorder
toremovethetaperedshank.
4. Knockthetapershank(i)(gentlywithaplastichammer)toloosenitinthespindlesleeve.
5. Mattthecutterwithanoilcloth.
6. Installtheprotectivecover(a).
ChesterUKCobraMill
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TravelAdjustment
Theliftinghandlecanbeusedtocontrolthetravellingofthespindlebox.
1. Loosenthescrewinsidethespindlebox.
2. Rotationoftheliftinghandlewillmovethespindleboxupordown.
FineFeeding
Tooperatethefinefeed,pushtheclutchleverin.Thiswillenablethehandwheelforthefinefeed.
MitreWedgeAdjustment
Inthelongtermwearwilloccuronthedovetail.Thiswillcauseinaccuracythatcanbeeliminatedby
adjustingthemitrewedge(adjustingthedovetailgibstrip).Adjustingthescrewslidesthetaperedstripto
reducethegapandrestoreaccuracyofthemill.
Thefollowingadjustmentsarepossible:
1. Base&YAxisCrossSlide.
2. XAxisCrossSlide&WorkTable
3. MillHeadSeat&VerticalColumn.
4. MillHead&Spindle.
TheWayToAdjust
1. Loosenthelockednuts.
2. Adjust the foremost pressure of the mitre wedge by locked nut. If necessary, loosen all the
adjustingscrewstothesame.
3. Tightenand loosen the adjusting screws, also keeping the pressure of each adjusting screw
thesame.
4. Tightenthelockednutuniformly.
5. Whenthenutislocked,pleaseusethe#3interiorhexagonalwrenchtofixtheadjustingscrew
fromrotating(thiswillcauseanunbalanceinthepressure).
6. Please adjust the middle portion first and then go to toward the interior from two sides
uniformlywhileyouareadjustingthescrewinordertoensureuniformpressure.
ChesterUKCobraMill
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