Technical Documentation for CB-ND & CB-NS

Collet Chucks

www.microcentric.com

MicroCentric

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 Drawings & Parts Lists8.1 CB-ND Dead Length Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138.2 CB-NS Low Profile Dead Length Models (for Sub Spindles) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

9.0 Collet Chuck Installation9.1 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

MicroCentric

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

IMPORTANT Instructions for optimum chuckperformance and avoiding errorsor misuse of chuck.

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

We recommend you read through this entire manual to familiarize yourself with the installation andoperation of MicroCentric collet chucks before installing and using your chuck. We also suggest youkeep this manual at hand for future reference.

2

MicroCentric

3

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.

MicroCentric

4

! 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.

MicroCentric

5

! 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 hammer

The 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.

MicroCentric

6

! 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.

MicroCentric

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

7

MicroCentric

5.0 CHUCKING GUIDELINES5.1 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 workpiece’s 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, thecollet’s 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

8

MicroCentric

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 callingMicroCentric’s 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

MicroCentric

10

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

! CAUTION

5.4 END STOPPING A WORKPIECEPart stops can be mounted inside CB-ND, CB-NS,and CB-K series collet chucks to provide endlocation of the workpiece. Figure 5.3 illustrates atypical part stop configuration using a stop platemounted inside the collet chuck body. Part stops,locators, and ejectors are available for specificworkpiece applications. Contact MicroCentric’stechnical sales staff for information.

When using a dead length style collet chuck, aworkpiece can also be end stopped on a bankingface machined in the bore a collet, as shown in figure5.4, or on the front face of a collet as shown in figure5.5.

Figure 5.3

Figure 5.5Figure 5.4

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 MicroCentric’stechnical sales staff for further information.

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

! WARNING

MicroCentric

ød

L

øA

6.1 QUICK CHANGE COLLETS

Collet Model

42mmSK42BZI

1.625" +/- .020"3.122" 1.850"

+/- 0.5mm79.3mm 47mm

66mmSK65BZI

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

+/- 0.5mm99.5mm 58mm

100mmSK100BZI

3.937" +/- .040"5.689" 2.323"

+/- 1.0mm144.5mm 59mm

øA L Rangeød Max.

6.2 "S" PAD MASTER COLLETS

ød

L

øA

Master Collet

SK46BZI/S16 S-16+/- .020"1.625" 1.850"

+/- 0.5mm41.3mm 47mm

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

+/- 0.5mm50.8mm 58mm

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

+/- 0.5mm57.2mm 59mm

L Rangeød 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

11

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.

MicroCentric

12

7.1 QUICK CHANGE COLLET CHUCKS

Chuck Model

42mm

CB42-ND/NS

1.625"

+/- .020"

+/- 0.5mm

66mm

CB65-ND/NS

2.625"

100mm

CB100-ND

3.937"

+/- .040"

+/- 1.0mm

Collet Model SK42BZI SK65BZI SK100BZI

Through Capacity

Clamping Range+/- .020"

+/- 0.5mm

Draw Tube Stroke4mm

.160"

4mm

.160"

7mm

.275"

Max. Draw Tube Force3,580 kg

7,850 lbs

4,590 kg

10,095 lbs

6,630 kg

14,580 lbs

Max. Clamping Force4,280 kg

9,420 lbs

5,510 kg

12,115 lbs

7,950 kg

17,500 lbs

Max. Spindle Speed 6,000 rpm 6,000 rpm 4,500 rpm

7.0 COLLET CHUCK MODELS & SPECIFICATIONS

7.1 "S" PAD COLLET CHUCKS

Chuck Model

42mm

CB46-NS

1.625"

+/- .020"

+/- 0.5mm

50.8mm/57.2mm

CB65-ND/NS

2.000"/2.250"

66.7mm/76.2mm

CB80-ND

2.625"/3.000"

+/- .020"

+/- 0.5mm

Master Collet Model SK46BZI/S16 SK65BZI/S20-S22 SK80BZI/S26-S30

Through Capacity

Clamping Range+/- .020"

+/- 0.5mm

Draw Tube Stroke4mm

.160"

4mm

.160"

4mm

.160"

Max. Draw Tube Force3,580 kg

7,850 lbs

4,590 kg

10,095 lbs

5,050 kg

11,105 lbs

Max. Clamping Force4,280 kg

9,420 lbs

5,510 kg

12,115 lbs

6,060 kg

13,330 lbs

Max. Spindle Speed 6,000 rpm 6,000 rpm 4,500 rpm

MicroCentric

13

8.0 COLLET CHUCK ASSEMBLY

Item No. Qty Description1 1 Spindle Adapter2 3 Collet Sleeve Mounting Screw3 1 Draw Tube Connector4 1 Collet Chuck Body5 6 Chuck Body Mounting Screw6 1 Tapered Collet Sleeve7 1 Collet - Quick Change or Master8 6 Spindle Adapter Mounting Screw9 1 O-Ring10 4 Radial Adjusting Screw11 3 Tapered Set Screw12 1 Face Seal13 3 Collet Sleeve Bushing14 2 O-Ring15 1 Lock Screw16 1 Locating Key

8.1 CB-ND DEAD LENGTH MODELS

Collet Chuck Body AssemblyTo replace a collet chuck with a worn tapered colletsleeve, a collet chuck body assembly is available.A chuck body assembly consists of the following:

Item 4 - Chuck BodyItem 5 - Tapered Collet SleeveItem 2 - Collet Sleeve Mounting ScrewsItem 9 - O-RingItem 10 - Radial Adjusting ScrewsItem 11 - Tapered Set ScrewItem 12 - Face SealItem 13 - Collet Sleeve BushingItem 14 - O-RingItem 15 - Lock ScrewItem 16 - Locating Key

Worn tapered collet seats can also be reground.Contact one of MicroCentric's technical salesassociates for information.

MicroCentric

14

8.2 CB-NS LOW PROFILE DEAD LENGTH

Item No. Qty Description1 1 Spindle Adapter2 3 Collet Sleeve Mounting Screw3 1 Draw Tube Connector4 1 Collet Chuck Body5 3 Collet Sleeve Bushing6 6 Chuck Body Mounting Screw7 1 O-Ring8 1 Collet - Quick Change or Master9 6 Spindle Adapter Mounting Screw10 1 O-Ring11 3 Tapered Set Screw12 1 Locating Key13 1 Face Seal14 1 Collet Sleeve

Collet Chuck Body AssemblyTo replace a collet chuck with a worn tapered colletsleeve, a collet chuck body assembly is available.A chuck body assembly consists of the following:

Item 4 - Chuck BodyItem 14 - Tapered Collet SleeveItem 2 - Collet Sleeve Mounting ScrewsItem 5 - Collet Sleeve BushingItem 7 - O-RingItem 10 - O-RingItem 11 - Tapered Set ScrewItem 12 - Locating KeyItem 13 - Face Seal

Worn tapered collet seats can also be reground.Contact one of MicroCentric's technical salesassociates for information.

MicroCentric

15

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 assemblydrawings (on pages 13 and 14) to familiarize yourselfwith the chuck's components before installation.

9.1 MOUNTING ADAPTER PLATE1. Make certain that the spindle and the mounting

plate are clean and free of nick or burrs that couldprevent the proper seating of the adapter plate.

2. Mount the adapter plate to the machine spindle.Tighten the mounting bolts to the recommendedtorque value given in section 4.0.

3. Use a dial indicator to measure the radial and facerunout of the mounting surfaces of the adapterplate. Radial runout should not exceed .0002"(0.005mm). Runout of the face should not exceed.0001" (0.0025mm). On flat spindle noses, theradial runout can be adjusted by loosening themounting bolts and tapping the mounting platewith a plastic hammer. On tapered spindle nosesno adjustment is possible. If the runout exceedsthese values, remove the adapter from the spindlenose and verify that the adapter plate is seatingproperly and is clean and free of nicks and burrs.A skim cut can be taken on the pilot diameter andmounting face of the adapter once it is mounted tothe spindle to assure that both surfaces arerunning true.

9.0 COLLET CHUCK INSTALLATION

The radial runout of the mounting plate shouldnot exceed .0002" (0.005mm), and the runoutof the face of the mounting plate should notexceed .0001" (0.0025mm).

IMPORTANT

Figure 9.1

Figure 9.2

FaceRunout

RadialRunout

Position #2

Position #1

MicroCentric

16

9.2 MOUNTING CHUCK ASSEMBLY1. Set the draw tube force to the lowest pressure

that is available for your machine. Actuate thedraw tube to bring it to the forward position.

2. Make certain that the mounting surfaces of thechuck body and adapter plate are clean and freeof nicks or burrs that could prevent the properseating of the chuck body. Also make sure the(4) radial adjusting screws are not protruding intothe locating diameter of the chuck body.

3. Take the entire chuck assembly and thread thedraw tube connector onto the draw tube until thethread bottoms out. Back the chuck assembly offthe draw tube thread 1/4 turn.

4. Actuate the draw tube to seat the chuck onto theadapter plate, and align the mounting bolts in thebody with the mounting holes on the adapterplate.

5. Semi tighten all the mounting bolts, but do notfully tighten them at this point.

6. Indicate the ID runout of the collet taper as shownin position #1 in figure 9.2. Make adjustments tothe (4) radial adjusting screws so that the runoutof the collet taper is within .0002" (0.005mm).

7. Before tightening the mounting bolts, measure therunout of the collet taper on position #2 in figure9.2. If the chuck body is properly seated on theadapter plate, the runout measured on position #2should be the same as position #1. If the runoutmeasured in position #2 exceeds the runout ofposition #1 by more than .0001" (0.0025mm),remove the chuck body from the adapter plateand repeat this mounting procedure.

8. After the runout of the collet taper has beenadjusted, tighten the mounting bolts to the torquespecifications given on page 7. Also make sure totighten all (4) radial adjusting screws.

9. Actuate the draw tube to verify that the chuck isfunctioning correctly by measuring the stroke oftapered sleeve as shown in figure 9.3.

The runout of the ID of the tapered colletseat should not exceed .0002" (0.005mm).

IMPORTANT

Figure 9.3

Chuck Model Min. Max.

CB42-ND

CB42-NS

CB65-ND

CB65-NS

CB80-ND

-.068"

-.100"

-.095"

+.092"

+.060"

+.065"

Min. Max.

Verify that the chuck is functioning correctlyby measuring the stroke of the collet sleeve.

IMPORTANT

-2.4mm +1.7mm

-.035" +.125"-0.9mm +3.2mm

-.070" +.090"-1.8mm +2.3mm

+1.5mm+2.5mm

+2.3mm+1.7mm

CB100-ND-.195" +.125"

-9.9mm +3.2mm

MicroCentric

17

10.0 QUICK CHANGE COLLET

The collet chuck must be in the unclampedposition when installing and removing quickchange collets. Dead length chucks areunclamped when the collet sleeve is fullyretracted.

IMPORTANT

Verify the collet is properly coupled into thechuck body by actuating the chuck beforeattempting to clamp a workpiece.

IMPORTANT

Do not continue to turn the hand wheel onthe manual changing fixtures after all colletsegments are touching.

! CAUTION

Do not exceed 100 psi inlet air pressure forpneumatic changing fixtures.

! CAUTION

If the collet does not easily go into or comeout of the coupling inside the collet chuckbody, check to make sure the collet is fullycollapsed. Check to make sure that chips arenot preventing the collet from collapsing.Also make sure the collet chuck is in theunclamped position.

IMPORTANT

MicroCentric quick change collets are collapsed by achanging fixture for installation and removal from thecollet chuck. Changing fixtures are available inmanual and pneumatic models.

10.1 COLLET INSTALLATION1. Insert the pins on the changing fixture into the

holes on the face of the quick change collet.2. Actuate the changing fixture to collapse the collet.

On manual changing fixtures turn the hand wheelclockwise until the rear of all collet segment aretouching. On pneumatic changing fixtures depressand hold the trigger button.

3. With the collet fully collapsed, insert the collet intothe tapered collet seat. Make certain that the keyslot in one of the collet segments is aligned withthe key in the tapered collet seat.

4. While pressing the rear of the collet firmly againstthe face seal inside the chuck body, release thecollet by turning the hand wheel counterclockwiseon the manual changing fixture. On pneumaticchanging fixtures, release the trigger button.

5. Remove the changing fixture from the collet.6. Actuate the chuck to make sure the collet is

properly coupled in the chuck body. Also clamp aplug, bar end, or workpiece in the collet to verifythe collet is clamping properly.

10.2 COLLET REMOVAL1. Insert the pins on the changing fixture into the

holes on the face of the quick change collet.2. Actuate the changing fixture to collapse the collet.3. When the collet is fully collapsed pull the collet

straight out from the chuck.4. After the collet has been removed from the chuck,

remove the collet from the changing fixture byreleasing the changing fixture.

MicroCentric

18

MicroCentric "S" pad master collets are a bayonetcoupling design. A collet installation ring is used toinstall and remove the master collet from the chuck.

11.1 COLLET INSTALLATION1. Back out all collet keys from the ID of the tapered

collet seat, by turning the collet keys counter-clockwise with a hex wrench. Make sure each keyis below the tapered surface of the collet seat.

2. Verify that the face seal is properly seated in thegroove behind the collet coupling. It isrecommended that grease be applied to the faceseal to make sure the master collet turnssmoothly as it is installed in the chuck.

3. Place the master collet into the tapered seat ofcollet chuck. Make sure the ears on the couplingon the collet engage into the cutouts in thecoupling in the chuck body.

4. Place the collet installation ring onto the face ofthe collet. The pins on the bottom face of the ringshould engage into the rubberized slots on themaster collet.

5. Press the master collet firmly against the faceseal in the chuck body and turn the installationring until the alignment mark is in line with one ofthe collet keys.

6. Bring one collet key back into the collet seat byturning it clockwise with a hex wrench, andengage the key into the key slot on the OD of themaster collet. You may need to turn the mastercollet slightly to allow the key to engage in theslot.

7. Engage the other collet keys in the slots on theOD of the master collet. Make sure each key istight, and each retaining screw is replaced on theOD of the chuck body.

8. Actuated the chuck to make sure the master colletis properly coupled into the collet chuck body.

11.2 REMOVING THE MASTER COLLET1. Back out the collet keys to disengage them from

the key slots on the OD of the master collet.2. Insert the installation ring onto the face of the

master collet and turn the collet until the couplingis released. Turn the collet 60 degrees on CB46and CB65 model chucks, and 90 degrees onCB80 models.

3. Remove the master collet from the tapered colletseat in the chuck body by pulling is straight outfrom seat.

11.0"S" PAD MASTER COLLET

The collet chuck must be in the unclampedposition when installing and removing themaster collet. Dead length chucks areunclamped when the collet sleeve is fullyretracted.

IMPORTANT

Remove the collet pads from the mastercollet before installing or removing themaster collet from the chuck.

IMPORTANT

Make sure all collet keys are properly en-gaged in the key slots on the OD of the mastercollet after installation.

IMPORTANT

Verify the master collet is properly coupledinto the chuck body by actuating the chuckbefore attempting to clamp a workpiece.

IMPORTANT

MicroCentric

19

12.0 CHANGING FIXTURE ASSEMBLY DRAWINGS & PARTS LISTS

12.1 MANUAL COLLET CHANGING

Item No. Qty Description1 1 Hand Wheel2 1 Retaining Screw3 1 Housing4 1 Rod Actuator5 3 Jaw6 3 Pivot Pin7 3 Collet Pin8 1 Bearing9 1 Spring

MicroCentric

20

12.2 PNEUMATIC COLLET CHANGING

Item No. Qty Description1 1 Handle2 1 Trigger3 1 Cylinder4 1 Piston5 1 Wear Plate6 1 Actuator Rod7 3 Lever*8 1 Front Plate9 3 Jaw*10 1 O-Ring11 2 O-Ring

Item No. Qty Description12 1 O-Ring13 1 O-Ring14 1 Set Screw15 2 Socket Head Cap Screw16 1 Retaining Screw17 3 Lever Pivot Pin*18 3 Jaw Pivot Pin*19 6 Collet Pin**20 1 Trigger Spring 21 1 Conical Spring 22 1 Hollow Bolt

* CP-100 Changing Fixture has six of each of thesecomponents

MicroCentric

21

13.0 TROUBLE SHOOTING GUIDEThis trouble shooting guide is intended to help you identify some common causes of problems experiencedoperating MicroCentric collet chucks, or correctly clamping a bar or workpiece. For further assistance contactone of our technical sales associates.

PROBLEM POSSIBLE CAUSE SUGGESTED REMEDYThe tapered colletsleeve does notstroke fully.

The forward and retracted positionof the draw tube was not specifiedcorrectly.

Refer to the spindle data sheet on page 22.Remove the collet chuck from the machinespindle and measure the draw tube position.

The threaded draw tube connectorwas not made correctly.

Compare the design of the draw tube connec-tor with the spindle data sheet for the machinemodel the chuck is being mounted to.

Tapered collet seat is running out,(mounting screws not tight).

Indicate ID of the collet seat and retrue chuckto within specifications given in section 9.2.Make sure all mounting screws are tight.

Workpiece (bar)runs out exces-sively.

Chips, dirt, or other foreign materialhas accumulated between the colletand tapered collet seat.

Remove the collet and clean out all accumu-lated chips and sludge from inside the chuck,both from tapered seat and coupling area.

The tapered collet seat in thechuck body is worn.

Replace the chuck body assembly or regrindthe ID of the tapered collet seat.

The clamping diameter and/or theOD taper of the collet have worn.

Replace or regrind the collet. Note only theclamping diameter of a collet can be reground.

Collet is oversized for the bar orworkpiece clamping diameter.

Use a collet with a clamping diameter thatmatches the OD of the bar or workpiece.

Insufficient clamping force. Increase the hydraulic pressure to the cylinderto increase the draw tube force to the chuck.

Cutting force is too high. Reduce cutting force.Coefficient of friction betweencollet and workpiece (bar) isinsufficient.

Use a serrated collet. Use more aggressiveserrations. Or apply a diamond particle platingor carbide grit to the clamping surface of thecollet.

Spindle speed is too high. Reduce spindle speed.

Chips and sludge mat haveaccumulated inside the chuckbody preventing the collet sleeveand/or the draw tube connectorfrom stroking fully.

Disassemble the chuck and clean all chips andsludge that has built up inside the chuck body.

Workpiece (bar)slips or pushes backduring machining.

Workpiece comesout of the collet, orcollet uncouplesfrom the chuckwhen clamping.

A workpiece whose overall lengthis shorter than .312" (8mm) isbeing clamped.

Use a reduced nose collet for clamping shortworkpieces. Refer to section 5.3 on page 9regarding the clamping of short workpieces.

Too short a length of theworkpiece is being clamped.

Pneumatic colletchanging fixturedoes not actuate.

The air passage in the triggerbutton is clogged from usingunfiltered air.

Remove the trigger button from the handleassembly and clear the clog in the air pas-sage.

If using a standard nose collet, increase thelength being clamped to .37" (10mm) minimum.

MicroCentric

22

14.0 SPINDLE DATA SHEET

A* taper size

B mounting thread

C length of pilot

D through hole diameter

E ID counterbore or taper (if any)

F depth of counterbore (if any)

G OD of draw tube

H ID of draw tube

J thread (RH or LH / ID or OD)

K length of thread

L** forward position

M retracted position

Machine Serial No.

* For machines with a straight spindle pilot a detail drawing of the spindle must be submitted** Positive (+) indicates draw tube is in front of the spindle face (as shown)

Negative (-) indicates draw tube is behind the spindle face

Chuck Model

Serial No. Ref. No.

G D

K

H

F

C

A

EJ

M (Draw tube retracted)

L (Draw tube forward)

B

Date

Machine Make

Machine Model

MicroCentricMicroCentric Corp • 25 Terminal Drive, Plainview, NY 11803 • USATel: 516-349-7220 • Fax: 516-349-9354 • e-mail: sales@microcentric.com

1-800-573-1139www.microcentric.com

CB-ND MNL-04