Technical Documentation for CB-NDR Pull to Close ?· Technical Documentation for CB-NDR Pull to Close…

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  • Technical Documentation for CB-NDR Pull to Close

    Dead Length Collet Chucks

    MicroCentric

    www.microcentric.com

  • MicroCentric

    1.0 TABLE OF CONTENTS

    1

    1.0 Contact & Service Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2.0 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 3.0 Precautions for Safe Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 4.0 Recommended Tightening Torque for Mounting Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 5.0 Chucking Guidelines

    5.1 Accuracy & Runout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85.2 Clamping Force . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95.3 Clamping Short Workpieces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95.4 End Location of Workpiece . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105.5 Centrifugal Force . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

    6.0 Collet Models, Specifications, & Capacities6.1 Quick Change Collets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116.2 "S" Pad Master Collets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

    7.0 Collet Chuck Models & Specifications7.1 Quick Change Collet Chucks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127.2 "S" Pad Collet Chucks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

    8.0 Collet Chuck Assembly Drawing & Parts Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 9.0 Collet Chuck Installation

    9.1 Mounting Adapter Plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159.2 Mounting Collet Chuck Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

    10.0 Quick Change Collet Installation & Changeover10.1Quick Change Collet Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1710.2Quick Change Collet Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

    11.0 "S" Pad Master Collet Installation & Removal11.1 "S" Pad Master Collet Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1811.2 "S" Pad Master Collet Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

    12.0 Changing Fixture Assembly Drawings & Parts Lists12.1Manual Changing Fixtures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1912.2Pneumatic Changing Fixtures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

    13.0 Trouble Shooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 14.0 Spindle Data Sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

    1.0 CONTACT & SERVICE INFORMATIONManufactured by:MicroCentric Corp.Plainview, NY USA

    Service in North America:MicroCentric Corp.25 Terminal DrivePlainview, NY 11803Tel: 1-800-573-1139 (toll free)

    1-516-349-7220Fax: 1-516-349-9354E-mail: sales@microcentric.com

    Service in Europe:MicroCentric GmbHAuf der Hub 9D-70439 StuttgartGermanyTel: 49-711-9809240Fax: 49-711-802483E-mail: info@microcentric.de

    Service in Asia:Dynamic Tools Corp.3-3-13 Saikujo-choNara 630JapanTel: 81-742-62-6760Fax: 81-742-62-6766E-mail: dynex@earth.email.ne.jp

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    Safety Alert SymbolThis is the industry "Safety Alert Symbol". This symbol is usedto call your attention to items or operations that could bedangerous to you or persons using this equipment. Please readthese messages and follow these instructions carefully.It is essential that you read the instructions and safety regula-tions before you attempt to assembly or use this unit.

    ! DANGER

    ! WARNING

    ! CAUTION

    !

    Indicates an imminent hazardouscondition which, if not avoided, couldresult in serious injury or death.

    Indicates a potentially hazardouscondition which, if not avoided, couldresult in serious injury or death.

    Indicates a potentially hazardouscondition which, if not avoided, couldresult in minor or moderate injury.

    2.0 INTRODUCTION

    IMPORTANTInstructions for optimum chuckperformance and avoiding errorsor misuse of chuck.

    MicroCentric Collet Chucks offer unmatched accuracy and long term performance. The information containedin this manual, if properly followed, will enable you to take full advantage of your chuck's capabilities.

    We recommend you read through this entire manual to familiarize yourself with the installation and operation ofMicroCentric collet chucks before installing and using your chuck. We also suggest you keep this manual athand for future reference.

    2

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    3.0 PRECAUTIONS FOR SAFE OPERATION

    ! DANGER

    ! DANGER

    ! DANGER

    Switch off power to the machine before installing,or changing the chuck.

    Do not operate the control valve (foot pedal) or solenoidvalve during spindle rotation.

    Do not exceed the maximum recommended speed of thechuck for a given input pressure (draw tube force).

    The machine spindlemay inadvertantly beswitched on, and theturret indexed or joggedpotentially causingserious injury to theoperator.

    The workpiece will bethrown from the chuckpotentially causingserious injury to theoperator.

    The workpiece can bethrown from the chuckdue to inadequategripping force as aresult of centrifugalforce.

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    ! WARNING

    ! WARNING

    ! WARNING

    Do not start the machine with the door open.

    Do not exceed the maximum recommended input force(draw tube force) for a specific chuck model.

    Make certain the mounting bolts are securely tightenedto the recommended torque values.

    The operator could beinjured by cutting chipsor other flying debris.

    The workpiece can bethrown from the chuckas a result of damage tothe chuck's actuatingmechanism.

    The chuck couldbecome loose duringoperation causingdamage to the chuckand potentially throwingthe workpiece from thechuck.

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    ! WARNING Long workpieces should be supported by a live centerin the tail stock or by a steady rest.The workpiece can bethrown from the chuck ifit is too long and notproperly supported.

    ! CAUTION Never hit the outside of the chuck, the tapered sleeve,or the workpiece with a hammerThe workpiece can bethrown from the chuck ifthe chuck is damaged.

    ! WARNING Do not attempt to modify the chuck or any or its' components.The workpiece can bethrown from the chuckdue to damage whichmay be caused to thechuck.

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    ! CAUTION Always make sure to keep your hands and fingers clear ofthe collet and workpiece as the chuck is clamped.The operator can beseriously injured if afinger or hand isclamped between thetop jaw and workpiece.

    ! WARNING

    ! WARNING

    Never attempt to operate a machine tool while underthe influence of drugs or alcohol.

    Never wear gloves, loose clothing, or ties while operatinga machine tool.

    Damage to the ma-chine, tooling, andchuck, or serious injuryto the operator couldresult.

    Gloves, loose clothing,and ties can becomecaught in the chuckcausing serious injury tothe operator as thespindle is rotated.

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    4.0 RECOMMENDED TIGHTENING TORQUE FOR MOUNTING SCREWS

    Screw Size

    M5 9.5 N-m

    9.4 lb-ft

    Tightening Torque

    M6M8

    M10

    M12

    M14

    M16

    M20

    12.7 N-m

    38.2 N-m

    72.6 N-m

    106.8 N-m

    170.6 N-m

    250.0 N-m

    402.1 N-m

    7.0 lb-ft

    28.2 lb-ft

    53.5 lb-ft

    78.8 lb-ft

    125.8 lb-ft

    184.4 lb-ft

    296.6 lb-ft

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    5.0 CHUCKING GUIDELINES

    5.1 ACCURACY AND RUNOUTTo obtain high accuracy workholding it is important tocorrectly match the collet diameter to the workpiecediameter being clamped. Each workpiece has adimensional tolerance, and to achieve best chuckingaccuracy the collet should be sized to correspond tothe largest diameter of the workpieces range.Figure 5.1 illustrates the principle of single linecontact by each collet segment. This condition willenable you to obtain minimum workpiece runout.

    When a workpiece is clamped by a collet that has adiameter that is smaller than the workpiece diameter,the condition shown in figure 5.2 will result. This willproduce higher clamping force on the workpiece,however, accuracy will be sacrificed.

    Even when close chucking accuracy is not required,it is always important to use a collet with the properbore size for each workpiece or bar stock. Followingthis principle will maximize the overall performanceof the collet chuck system.

    In order to obtain close chucking accuracy, thecollets surfaces must be kept clean and free fromchip buildup. On long running operations it isrecommended that the collet be removed periodicallyfor cleaning.

    Figure 5.1 Figure 5.2

    Keep the clamping surface of the colletclean and free from chip buildup.

    IMPORTANT

    The collet should be removed periodicallyfrom the chuck and cleaned.

    IMPORTANT

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    5.2 CLAMPING FORCEHigher clamping force is generally required forroughing applications as compared to finishingoperations. The clamping characteristics of a colletare enhanced by serrations, which will permittedhigher rates of metal removal at the same draw tubeforce as compared to a smooth bore collet. Thefrictional force between the collet and workpiece orbar stock can also be increased by applying acarbide grit or diamond particle plating to theclamping surface of the collet. Sharp serrations thatpenetrate the surface of the workpiece provide thegreatest clamping force to prevent workpieceslippage. Collets with widely spaced serrations alsohave enhanced clamping capability. The appropriatecollet configuration for a given application isdetermined by a number of factors including cuttingforces, spindle speed, and the material of theworkpiece or bar stock. Recommendations for aspecific applications can be obtained by callingMicroCentrics technical sales staff.

    5.3 CLAMPING SHORT WORKPIECESIf the clamping length of a workpiece is .312" (8mm)or less, it is necessary to use a reduced nose collet.Figure 9.3 shows a reduced nose collet with abanking step clamping a short workpiece.

    To accurately clamp short workpieces, the part mustbe located against a banking step in the collet (ondead length chucks) or against a part stop mountedinside the chuck body. In order to clamp shortworkpieces with minimum runout, the workpiecemust have a square face to locate against.

    9

    Do not exceed the maximum recommendeddraw tube force for a specific collet chuckmodel.

    ! WARNING

    Figure 5.3

    Whenever the clamping length of a work-piece is .312" (8mm) or less, it is necessaryto use a reduced nose collet.

    ! CAUTION

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    Collet chucks running at speeds above4,000 rpm may need to be dynamicallybalanced.

    ! CAUTION

    5.4 END STOPPING A WORKPIECEWhen using a dead length style collet chuck, aworkpiece can also be end stopped on a bankingface machined in the bore a collet, as shown infigure 5.3, or on the front face of a collet as shownin figure 5.4.

    Figure 5.4

    Figure 5.3

    5.5 CENTRIFUGAL FORCEThe clamping force of a collet is affected bycentrifugal force as spindle speed increases. Neverexceed the maximum spindle speed recommendedfor a specific collet chuck model.

    The loss of clamping force at high spindle speedscan be minimized by reducing the weight of a collet.Excess weight can be removed from a collet bydrilling holes into the front face. For some high speedapplications it may be necessary to dynamicallybalance the collet chuck. Consult MicroCentricstechnical sales staff for further information.

    Do not exceed the maximum recommendedspindle speed for a specific collet chuckmodel.

    ! WARNING

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    d

    L

    A

    6.1 QUICK CHANGE COLLETS

    Collet Model

    66mmSK65BZI

    2.625" +/- .020"3.917" 2.284"

    +/- 0.5mm99.5mm 58mm

    A L Ranged Max.

    6.2 "S" PAD MASTER COLLETS

    d

    L

    A

    Master Collet

    SK65BZI/S20+/- .020"2.000" 2.284"

    +/- 0.5mm50.8mm 58mm

    SK65BZI/S22+/- .020"2.250" 2.323"

    +/- 0.5mm57.2mm 59mm

    L Ranged Max.Collet Pad

    SK80BZI/S26+/- .030"2.625" 1.850"

    +/- 0.75mm66mm 47mm

    SK80BZI/S30+/- .030"3.000" 1.850"

    +/- 0.75mm76.2mm 47mm

    S-20

    S-22

    S-26

    S-30

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    6.0 COLLET MODELS & SPECIFICATIONS

    Vulcanized RubberMicroCentric Quick Change and "S" Pad Master Colletsare hardened and precision ground segments heldtogether by vulcanized rubber.

    MicroCentric's vulcanizing technology produces apermanent bond between rubber and metal. However, ifthe rubber becomes damaged during normal use, thecollet can be returned to MicroCentric and revulcanized.Contact one of our technical sales associates forinformation and cost.

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    7.1 QUICK CHANGE COLLET CHUCKS

    Chuck Model

    66mm

    CB65-NDR

    2.625"

    Collet Model SK65BZI

    Through Capacity

    Clamping Range+/- .020"

    +/- 0.5mm

    Draw Tube Stroke4mm

    .160"

    Max. Draw Tube Force3,210 kg

    7,060 lbs

    Max. Clamping Force5,510 kg

    12,115 lbs

    Max. Spindle Speed 5,000 rpm

    7.0 COLLET CHUCK MODELS & SPECIFICATIONS

    7.1 "S" PAD COLLET CHUCKS

    Chuck Model

    50.8mm/57.2mm

    CB65-NDR

    2.000"/2.250"

    66.7mm/76.2mm

    CB80-NDR

    2.625"/3.000"

    +/- .020"

    +/- 0.5mm

    Master Collet Model SK65BZI/S20-S22 SK80BZI/S26-S30

    Through Capacity

    Clamping Range+/- .020"

    +/- 0.5mm

    Draw Tube Stroke4mm

    .160"

    4mm

    .160"

    Max. Draw Tube Force3,210 kg

    7,060 lbs

    3,530 kg

    7,770 lbs

    Max. Clamping Force5,510 kg

    12,115 lbs

    6,060 kg

    13,330 lbs

    Max. Spindle Speed 5,000 rpm 4,500 rpm

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    8.0 COLLET CHUCK ASSEMBLY DRAWING AND PARTS LISTS

    Item No. Qty Description1 1 Spindle Adapter2 1 Draw Tube Connector3 1 O-Ring4 1 Retaining Plate5 23 Ball Bearing6 1 Actuator7 1 Tapered Ring8 1 Bushing Ring9 6 Spring10 3 Locking Set Screw11 1 Collet Chuck Body12 6 Chuck Body Mounting Screw13 1 Locating Key14 1 Lock Screw15 1 Collet - Quick Change or Master16 6 Spindle Adapter Mounting Screw

    Item No. Qty Description17 3 Collet Sleeve Mounting Screw18 3 Collet Sleeve Bushing19 1 O-Ring20 4 Radial Adjusting Screw21 1 Face Seal22 2 O-Ring23 1 Tapered Collet Sleeve

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    MicroCentric collet chucks are supplied with a spindlemounting plate and a threaded draw tube connectorto suit the machine configuration specified when thechuck was ordered. Refer to the chuck assemblydrawing...

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