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Conair SC-5 manual Calculating Blade Interruption, B-4 APPENDIX, Cutter Blade Selection And Use

Models: SC-5

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Calculating Blade Interruption

CUTTER BLADE

SELECTION

AND USE

Calculating Blade Interruption

Blade interruption is the length of time which the blade interrupts the extrudate during the cutting process. Knowing blade interruption allows you to optimize blade speed and design for specific applications.

You can calculate blade interruption for your application if you know:

●the cutting blade width

●blade speed (cutter rpm)

●extrudate cross section

The rotary knife cut path circumference is fixed for each cut- ter model:

SC-5 Sure Cut	Bushing	Knife Cut Path	Knife Cut Path
Model	Diameter	Diameter	Circumference
5	2.25"	28"	87.9"
	3.25"	29"	91.1"
	4.25"	30"	94.2"
	5.25"	31"	97.3"
	2"x4"	28"	87.9"
	2"x6"	28"	87.9"
	2"x8"	28"	87.9"
	2"x10"	28"	87.9"
	3"x6"	29"	91.1"
	4"x7"	30"	94.2"

As an example, calculate the blade interruption (in millisec- onds) for an SC-5 cutter running 1/4 inch (0.250 inch) OD tubing. The blade speed is 718 rpm and the cutting blade is 15/16 inch (0.937 inch) width at the point where it passes through the extrudate, and the cut path circumference is 87.9" for the SC-5.

Calculate the blade interruption time. The interruption time starts when the blade makes its first contact with the extrudate and ends when the blade is totally clear of the product (i.e. no longer interrupting it). Because we know the blade travel speed, we can calculate the interruption time if we know how far the blade travels during period of interruption. This dis- tance is equal to the sum of the extrudate outer diameter and the blade width at the point of contact.

Blade interruption	= (Product OD + Blade width)	X 60,000
time, msec	Knife circumference	rpm

B-4 APPENDIX

CUTTER BLADE SELECTION AND USE

UGE059/1003

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Conair SC-5 manual Calculating Blade Interruption, B-4 APPENDIX, Cutter Blade Selection And Use

Contents

Instant Access Parts and Service SC-5 Servo ModelInstallation Operation Maintenance Troubleshooting Sure Cut Rotary Knife CutterDocument Number Serial numbers Model numbers Power Specifications Amps Volts PhaseDate CycleINTRODUCTION INSTALLATIONTABLE OF CONTENTS DESCRIPTIONPARTS/DIAGRAMS MAINTENANCETROUBLESHOOTING APPENDIXPurpose of the User Guide How the User Guide is organized no one gets hurt How to Use the Lockout DeviceINTRODUCTION Your Responsibilities as a User ATTENTION Read this soPURPOSE OF THE USER GUIDE HOW THE USER GUIDE IS ORGANIZEDYOUR RESPONSIBILITY AS A USER DANGER Sharp blades READ THIS SO NO ONE GETS HURTWARNING Voltage Hazard Two electric switches make a contact between the side and the clear polycarbonate sliding blade observation windows such that the windows MUST BE CLOSED in order to enable the blade wheel to spinREAD THIS SO NO ONE GETS HURT WARNING Electrical hazard HOW TO USE THE LOCKOUT DEVICEelectrical power Isolate the equipment fromPage What is the SC-5 Sure Cut Knife Cutter Typical Applications How the SC-5Works SC-5 Features Specifications Optional EquipmentDESCRIPTION SC-5 SURE CUT? WHAT IS THEMechanical Features FlywheelSC-5 SURE CUT? CONTINUEDWHAT IS THE DESCRIPTIONTYPICAL APPLICATIONS Cutting from Below the Bushing HolderHOW THE SC-5 SURE CUT WORKS HOW THE SC-5 SURE CUT WORKS CONTINUEDDESCRIPTION The SC-5 Sure Cut Servo Cutter features FEATURESSPECIFICATIONS SC-5Blade Wipe OPTIONAL EQUIPMENTSlide Base Custom Bushing Holder Sizes AvailableLeft to Right Machine Operation Discharge ConveyorIsolation Transformer Special Paint Type or ColorPage Sure Cut Connecting the Main Power Source Installing the Encoder INSTALLATIONUnpacking the Boxes Preparing for Installation Positioning the SC-5 Installing the Cutter Blades Mounting the Cutter BushingsCAUTION Lifting You are now ready to begin installationUNPACKING THE BOXES Carefully uncrate the cutter and its compo- nentsPREPARING FOR INSTALLATION 1 You need these tools for installationPOSITIONING THE SERVO CUTTER Determine the best distance from the belt puller toCAUTION Lifting Measure the centerline height of the extrudate as Adjust the cutters floorlock/caster assemblyAlign the cutter with the extrusion line POSITIONING THE SERVO CUTTERCONNECTING THE MAIN POWER SOURCE WARNING Electrical hazardINSTALLING THE ENCODER CAUTION Handle with careINSTALLING THE CUTTER BLADES Installing the Cutter BladesDANGER Sharp blades INSTALLING THE CUTTER BLADES CONTINUEDTIP We recommend that you MOUNTING THE CUTTER BUSHINGS Installation of the bushing7 Tighten the two screws in the housing to lock in the bushings 3-10CHECKING THE ALIGNMENT OF THE BUSHINGS Close the safety coverTurn on the Power Rotary main disconnect Checking the Alignment of bushing to bladeType of Cutter CHECKING REPEATABILITY3-12 Repeatability TimeMake sure all components are installed according TESTINGTESTING THE Check that all wiring conforms to electricalPage Maintenance Area Encoder Area Unit of Measure Scale Distance Homing The Cutter Control Before Starting Powering Up Main ScreenTotal Screen Batch Screen Length Screen Preset to Run Time Preset Offset Example Preventative Maintenance Power On TimeNumeric keys OPERATOR CONTROL FEATURESSoft Keys Fixed Function Keys at BottomBEFORE STARTING POWERING UPMake sure that the Cut Enable is Off Make sure the E-Stop button is in the out, extended positionPower UpEdictVerSequence.-975.05Runtime.134 POWERING UPCONTINUED OPERATOR CONTROL INSTRUCTIONS MAIN SCREEN Active PresetParts1ENC00000Off.000in MAIN SCREENCONTROL INSTRUCTIONS TOTAL SCREEN Parts TotalSelectSELECTAreaExitPARTSScreenAREABatchCONTROL INSTRUCTIONS TOTAL SCREENCONTROL INSTRUCTIONS TOTAL SCREEN CONTINUED Reset Softkey3CONTROL INSTRUCTIONS BATCH SCREEN BATCH SCREENCONTROL INSTRUCTIONS BATCH SCREEN PRESETExit000,000pcsBatch Preset Screen Batch Select Area ScreenLENGTH SCREEN Batch Pre-Alarm Preset ScreenCONTROL INSTRUCTIONS LENGTH SCREEN Enter or Delete?4-10 CONTROL INSTRUCTIONS PRESET TO RUN SCREENPRESETS TO RUN SCREEN CONTROL INSTRUCTIONS LENGTH SCREENCONTROL INSTRUCTIONS PRESET TO RUN SCREEN CONTROL INSTRUCTIONS TIME SCREENTIME SCREEN CONTINUEDHOLD-OFF TIME SCREEN CONTROL INSTRUCTIONS HOLD-OFF SCREEN4-12 Holdoff00000Exit.500secBLADE SPEED SCREEN SPEED0750.0rpmCONTROL INSTRUCTIONS BLADE SPEED SCREEN CONTROL INSTRUCTIONS HOLD-OFF SCREENBLADE COUNT SCREEN CONTROL INSTRUCTIONS BLADE COUNT SCREEN4-14 CONTROL INSTRUCTIONS BLADE SPEED SCREENBLADE COUNT CONTROLINSTRUCTIONS SCREEN4-16 CONTROL INSTRUCTIONS FUNCTION AREASCONTROL INSTRUCTIONS TEST Reset Softkey3CONTINUED Reset Softkey3CONTROL INSTRUCTIONS TEST On/Off Softkey1CONTROL INSTRUCTIONS CUT MODE 4-18CONTROL INSTRUCTIONS MINIMUM MEASUREMENT MAINTMaint. AREASELECT.MENUAREAFactoryMin SoftkeyIS00000CURRENTMINTIME.150sec AREA4-20 Maint. SoftkeyENTERPASSWORDCONTROL INSTRUCTIONS ENCODER AREA Factory SoftkeyDIRECTION SOFTKEY tion. INCORRECTCOUNTDIRECTIONISCONTROL INSTRUCTIONS ENCODER DIRECTION Change SoftkeyCONTROL SETTING THE SCALE FACTOR4-22 INSTRUCTIONS UNITENTERDISTANCEPERPER CONTROL INSTRUCTIONS SCALE DISTANCEDISTANCE SOFTKEY Numeric keysCOUNTS SOFTKEY CONTROL INSTRUCTIONS SCALE COUNTS4-24 Numeric keysHOMING CONTROL INSTRUCTIONS HOMINGCONTROL INSTRUCTIONS HOME OFFSET HOME OFFSET SCREENHOME OFFSET EXAMPLE CONTROL INSTRUCTIONS OFFSET EXAMPLE4-26 CONTROL INSTRUCTIONS HOME OFFSETCONTROL INSTRUCTIONS PREVENTIVE MAINTENANCE PREVENTIVE MAINTENANCE SOFTKEYInputsSELECTTimeP/MAREACycles Cycles SoftkeyMACH.CYCLES00000000Exit TIME SOFTKEYPOWERONExit00000.0HrsCONTROL INSTRUCTIONS POWER ON TIME 4-28STARTING THE SC-5 CUTTERCHECKING CUT QUALITY Insert a piece of extrudate through the cut- ter bushingsIn Flywheel mode, adjust blade speed MAKING ADJUSTMENTS DURING OPERATIONIn Encoder and Follower modes, adjust the length Adjust blade speed in all modes except FollowerWARNING Never stop the servo cut- ter by opening the knife guard 4 Disconnect the power cord if it is equipped withSTOPPING THE 1 Press Cut On/Off soft key to stop cutting soft keyPage Preventative Maintenance Schedule Checking the Blades MAINTENANCEMaintenance Features Warnings and Cautions Maintenance Overview Cleaning the Blade Tray Lubricating the Slide Rail SystemMAINTENANCE FEATURES WARNINGS AND CAUTIONS WARNING Voltage Hazard WARNINGS AND CAUTIONSLOCKOUT/TAGOUT DANGER Sharp bladesDaily MAINTENANCE OVERVIEWPREVENTATIVE MAINTENANCE SCHEDULE Checking cutter bladesClean the clear blade guard window Cleaning the blade lubrication tray if the cutterthis option. See Cleaning the Blade Tray WeeklyCHECKING BLADES DANGER Sharp bladesINSPECTING CUTTER BUSHING SCREWS CHECKING THE KNIFE GUARDCLEANING THE BLADE TRAY OPTIONAL LUBRICATING THE SLIDE RAIL SYSTEM OPTIONALCheck the depth of the proximity switch ADJUSTING THE PROXIMITY SWITCHESBe sure the main power is disconnected and the Remove the cutter bushingsMain power safety disconnect CHECKING ELECTRICAL CONNECTIONS5-10 WARNING Electrical hazard3 Open the electrical enclosure 5 Close the electrical enclosure doorCHECKING ELECTRICAL CONNECTIONS INSTALLATION INSTALLATION AND REMOVAL INSTRUCTIONS FORB-LOC LOCKING ASSEMBLY SERIES B112 INSTALLATION OF B-LOC LOCKING ASSEMBLIES OVER SHAFT KEYWAYSReplacing Safety and Proximity Switches Checking the Servo Amplifier TROUBLESHOOTINGCause of a Problem Electrical Problems Product Quality Problems Adjusting the Proximity Switches Checking the EncoderTROUBLESHOOTING SC-5 SURE CUT Servo Knife Cutter BEFORE BEGINNINGA FEW WORDS OF CAUTION WARNING Electrical hazardA FEW WORDS OF CAUTION IDENTIFYING THE CAUSE OF A PROBLEMThe main problems you will see with the servo cutter are DANGER Sharp bladesPossible cause Solution ELECTRICAL PROBLEMSSymptom The green start button does not illuminate when pressedMaster safety Symptom Possible cause Solutionty switch failed or the switch if needed. connection to it is loose Guard switch is badThere is a loose connec- tion There is an anti-jam cir- cuit signal There is a problem with the cutter controlThere is a problem with the servo amplifier There is a problem with the home proximity switchCutter mode selec- tion does not change cut mode Check for wiring for loosereducer assembly, Section There is a communicationBlade speed is too low PRODUCT QUALITY PROBLEMSHairs or strings The blade is too thickQUALITY PROBLEMSPRODUCT Burrs at cut siteCracks at cut site If using Nylon, it may be6-10 The extrudate is too coldThe knife bevel is not symmetric Cut is not square. The blade speed is too lowThe blade is misaligned The cutter bushings are not properly gapped For rigid products the puller is too close to the cutterProximity Switches REPLACING SAFETY AND PROXIMITY SWITCHESSafety Switch Check for loose or damaged wires1 Open the flywheel clear guard window ADJUSTING THE PROXIMITY SWITCHESDANGER Sharp blades Check all connections Check the connector that attaches the cable toCHECKING THE ENCODER Check the encoder cable for damage. If necesEncoder Mounting and General Information CHECKING THE ENCODERCONTINUED CHECKING THE MOTOR/REDUCER ASSEMBLY 6-16 TROUBLESHOOTING SC-5 SURE CUT Servo Knife Cutter1 Open the flywheel clear guard window mode TESTING REPEATABILITYPlace the cutter in any mode except follower Press the Cut On/Off button the cutter is activatedPage APPENDIX A-1 WE’RE HERE TO HELPFrom outside the United States, call HOW TO CONTACT CUSTOMER SERVICEEQUIPMENT GUARANTEE PERFORMANCE WARRANTY WARRANTY LIMITATIONS APPENDIX A-2CUTTER BLADE SELECTION AND USE Blade materialsAPPENDIX B-1 Blade Design B-2 APPENDIXCUTTER BLADE SELECTION AND USE Improving cut quality by adding heat to certain materials Blade thicknessOptimizing blade speed APPENDIX B-3Calculating Blade Interruption B-4 APPENDIXCUTTER BLADE SELECTION AND USE APPENDIX B-5 CUTTER BLADE SELECTION AND USECONAIR CUTTER BLADES CONAIR CUTTER BLADESB-6 APPENDIX PartALL ABOUT CUTTER BUSHINGS Cutter bushing bore sizeAPPENDIX C-1 Cutter bushing bore surface quality C-2 APPENDIXALL ABOUT CUTTER BUSHINGS Cutter bushing shear surface quality APPENDIX C-3ALL ABOUT CUTTER BUSHINGS C-4 APPENDIX Cutter bushing lengthCAUTION Blade hazard ALL ABOUT CUTTER BUSHINGSAdjusting the cutter bushing gap APPENDIX C-5ALL ABOUT CUTTER BUSHINGS Friction and heat during cutting BLADE AND BUSHING LUBRICATIONDescription of the cutting process D-1 APPENDIXAPPENDIX D-2 Common cutting lubricantsLubrication systems BLADE AND BUSHING LUBRICATIONBenefits of using lubricants D-3 APPENDIXBLADE AND BUSHING LUBRICATION ENCODER MODE OPERATOR DISPLAY OVERVIEW ExitEND SENSE MODE OPERATOR DISPLAY OVERVIEW FLYWHEEL MODE OPERATOR DISPLAY OVERVIEW TIMER MODE OPERATOR DISPLAY OVERVIEW FOLLOWER MODE OPERATOR DISPLAY OVERVIEW AUTO DEMAND MODE OPERATOR DISPLAY OVERVIEW MULTIBLE PRESETS ENCODER MODE EXAMPLE OPERATOR DISPLAY OVERVIEW accessed by pressing the menu button FUNCTION AREA OPERATOR DISPLAY OVERVIEWFUNCTION AREA OPERATOR DISPLAY OVERVIEW MAINTAINENCE AREA DISPLAY OVERVIEW 12.000 in. EQUALS