SERVOFLEX SFF (N)High performance metal disk coupling

'14.10-1.5-MP-SFFN(en)-002C

■ Selection

SERVOFLEX SFF (N)

Items Checked for Design Purposes

Tn [N･m] ≧ Td [N･m]

Loadproperties

Constant Vibration:Small Vibration:Medium Vaibration:Large

K 1.0 1.25 1.75 2.25

Td [N･m] = Ta [N･m] × K (see below)

Td [N･m] = TS [N･m] × (1.2 to 1.5)

Ta [N･m] ＝ 9550 × n [min－1]P [kW]

Find the torque Ta applied to the coupling using the output capacity, P, of the driver and the usage speed, n.

(1)

Determine the factor K from the load properties, and find the corrected torque, Td, applied to the coupling.

For servo motor drive, multiply the maximum torque, Ts, by the usage factor K = 1.2 to 1.5.

(2)

Set the size so that the rated coupling torque, Tn, is higher than the corrected torque, Td.

(3)

Check that the mount shaft is no larger than the maximum bore diameter of the coupling.

(4)

Contact MIKI PULLEY for assistance with any device experi-encing extreme periodic vibrations.

*

■ How to find the natural frequency of a feed screw system

■ Points to consider regarding the feed screw systemWhen the torsional natural frequency of the overall feed screw system is 400 to 500 Hz or less, gain adjustment of the servo motor may cause the servo motor to oscillate.Ocsillation in the servo motor during operation can cause problems particularly with the overall natural frequency and electrical control systems of the feed screw system. In order for these issues to be resolved, the torsional stiffness for the coupling and feed screw section and the moment of inertia and other characteristics for the system overall will need to be adjusted and the torsional natural frequency for the mechanical system raised or the tuning function (filter function) for the electrical control system in the servo motor adjusted during the design stage.Please contact Miki Pulley with any questions regarding servo motor oscillation.

Select a coupling based on the nominal and maximum torque of the servo motor.

(1)

Find the overall natural frequency, Nf, from the torsional stiffness of the coupling and feed screw, κ, the moment of inertia of driving side, J1, and the moment of inertia of driven side, J2, for the feed screw system shown below.

(2)

Motor Feed screw

Bearing

TableCoupling

Nf：Overall natural frequency of a feed screw system [Hz]κ：Torsional stiffness of the coupling and feed screw [N･m/rad]J1：Moment of inertia of the driver [kg･m²]J2：Moment of inertia of the follower [kg･m²]

Nf = 2π1

J1 J2K +1 1

J1J2

κ

002 MIKI PULLEY SERVOFLEX MIKI PULLEY SERVOFLEX 003

SERVOFLEX SFF (N) MODEL

*Compared to the conventional company products SFF model.

Coupling outer diameter, lineup for shaft diameter and rated torque are designed for the latest servo motor specifications and dimensions. It goes well with each manufacturer's the latest servo motors.Also, maximum 1.5 times rated torque compared to the company conventional model is achieved. It permits miniaturization of the coupling and reduces the moment of inertia. In addition, our unique technology had solved the problem of the clamp method which had been considered to be difficult to identify, precisely shaft centering is now realized.By adoption of the clamp method, installation time is drastically shortened.It's the metal disk coupling that can be used for high specifications of machine tools.

Best design for the latest servo motor SERVOFLEX for feed shaft which intro-duce the high precision clamp method

FULL LINEUP

SFF-□SS -□N TYPE

●Rated torque 8 to 600 N･m●Parallel offset misalignment 0.02 mm●Angular misalignment 1°●Axial displacement misalignment ±0.2 to ±0.8 mm●Operational temperature －30 to 120 ℃●Adapted to the RoHS

High-rigidity single element

SFF-□DS -□N TYPE

●Rated torque 8 to 600 N･m●Parallel offset misalignment 0.1 to 0.38 mm●Angular misalignment 1°(one side)●Axial displacement misalignment ±0.4 to ±1.6 mm●Operational temperature －30 to 120 ℃●Adapted to the RoHS

High-flexibility double element

BENDING RADIALTORQUE THRUST

BENDING RADIALTORQUE THRUST

Clamp hub Material: S45C or an equivalent Surface finishing: Black oxide finishing

Clamp bolt Material: Alloy steel for machine structural use Surface finishing: Black oxide finishing

Element material Metal disk: SUS304 Collar: S45C or an equivalent

Hexagon socket head cap screw Material: Alloy steel for machine structural use Surface finishing: Black oxide finishing

Clamp hub Material: S45C or an equivalent Surface finishing: Black oxide finishing

Clamp bolt Material: Alloy steel for machine structural use Surface finishing: Black oxide finishing

Element material Metal disk: SUS304 Collar: S45C or an equivalent

Hexagon socket head cap screw Material: Alloy steel for machine structural use Surface finishing: Black oxide finishing

Spacer Material: S45C or an equivalent Surface finishing: Black oxide finishing

002 MIKI PULLEY SERVOFLEX MIKI PULLEY SERVOFLEX 003

SERVOFLEX SFF (N) MODEL

*Compared to the conventional company products SFF model.

Coupling outer diameter, lineup for shaft diameter and rated torque are designed for the latest servo motor specifications and dimensions. It goes well with each manufacturer's the latest servo motors.Also, maximum 1.5 times rated torque compared to the company conventional model is achieved. It permits miniaturization of the coupling and reduces the moment of inertia. In addition, our unique technology had solved the problem of the clamp method which had been considered to be difficult to identify, precisely shaft centering is now realized.By adoption of the clamp method, installation time is drastically shortened.It's the metal disk coupling that can be used for high specifications of machine tools.

Best design for the latest servo motor SERVOFLEX for feed shaft which intro-duce the high precision clamp method

FULL LINEUP

SFF-□SS -□N TYPE

●Rated torque 8 to 600 N･m●Parallel offset misalignment 0.02 mm●Angular misalignment 1°●Axial displacement misalignment ±0.2 to ±0.8 mm●Operational temperature －30 to 120 ℃●Adapted to the RoHS

High-rigidity single element

SFF-□DS -□N TYPE

●Rated torque 8 to 600 N･m●Parallel offset misalignment 0.1 to 0.38 mm●Angular misalignment 1°(one side)●Axial displacement misalignment ±0.4 to ±1.6 mm●Operational temperature －30 to 120 ℃●Adapted to the RoHS

High-flexibility double element

BENDING RADIALTORQUE THRUST

BENDING RADIALTORQUE THRUST

Clamp hub Material: S45C or an equivalent Surface finishing: Black oxide finishing

Clamp bolt Material: Alloy steel for machine structural use Surface finishing: Black oxide finishing

Element material Metal disk: SUS304 Collar: S45C or an equivalent

Hexagon socket head cap screw Material: Alloy steel for machine structural use Surface finishing: Black oxide finishing

Clamp hub Material: S45C or an equivalent Surface finishing: Black oxide finishing

Clamp bolt Material: Alloy steel for machine structural use Surface finishing: Black oxide finishing

Element material Metal disk: SUS304 Collar: S45C or an equivalent

Hexagon socket head cap screw Material: Alloy steel for machine structural use Surface finishing: Black oxide finishing

Spacer Material: S45C or an equivalent Surface finishing: Black oxide finishing

004 MIKI PULLEY SERVOFLEX MIKI PULLEY SERVOFLEX 005

*These measurement results were calculated from actual experiments performed using MIKI PULLEY procedures and are not to be interpreted as guarantees of product performance.

No backlash

No backlash, accurate shaft rotation, and precise control.

Elastic （metal） couplingMetal disk ： SERVOFLEX

Elastic （rubber, plastic） couplingrubber, plastic commpression, etc

Correction couplingOldham, pin bush, etc

No backlash Pseudo backlash Backlash

High-rigidity metal disk flexible couplings

A layerd metal disk is rigid in the torsional direction and flexible in the parallel misallgnment, angular, and axial direction.

SFF SS(N) SFC SA2 SFC DA20

20

25

30

35

40

15

10

5

Oldham Cross-slit Heli-cal

Torsional rigidity comparison of couplings

Types of coupling

Tors

iona

l rig

idit

y　×

10

3［

N・

m/r

ad］

Outer diameter φ48 Outer diameter φ56 Outer diameter φ56

High rigidity and concentricity

SERVOFLEX has high rigidity and excellent concentricity, resulting in a greatly improved finish on a workpiece.

* Top row: Machined surface after using SERVOFLEX * Bottom row: Machined surface using jaw type coupling

High precision clamping connection

The number of mounting bolts has been reduced substantially. You can remarkable reduce mounting time.

SERVOFLEX SFF (N) MODEL

004 MIKI PULLEY SERVOFLEX MIKI PULLEY SERVOFLEX 005

*These measurement results were calculated from actual experiments performed using MIKI PULLEY procedures and are not to be interpreted as guarantees of product performance.

No backlash

No backlash, accurate shaft rotation, and precise control.

Elastic （metal） couplingMetal disk ： SERVOFLEX

Elastic （rubber, plastic） couplingrubber, plastic commpression, etc

Correction couplingOldham, pin bush, etc

No backlash Pseudo backlash Backlash

High-rigidity metal disk flexible couplings

A layerd metal disk is rigid in the torsional direction and flexible in the parallel misallgnment, angular, and axial direction.

SFF SS(N) SFC SA2 SFC DA20

20

25

30

35

40

15

10

5

Oldham Cross-slit Heli-cal

Torsional rigidity comparison of couplings

Types of coupling

Tors

iona

l rig

idit

y　×

10

3［

N・

m/r

ad］

Outer diameter φ48 Outer diameter φ56 Outer diameter φ56

High rigidity and concentricity

SERVOFLEX has high rigidity and excellent concentricity, resulting in a greatly improved finish on a workpiece.

* Top row: Machined surface after using SERVOFLEX * Bottom row: Machined surface using jaw type coupling

High precision clamping connection

The number of mounting bolts has been reduced substantially. You can remarkable reduce mounting time.

SERVOFLEX SFF (N) MODEL

006 MIKI PULLEY SERVOFLEX 007To download CAD data or product catalogs www.mikipulley.co.jp WEB CODE A002

How to Place an Order SFF-080SS-25BK-30BK-200N

Size

Type S: Single elementMaterial S: SteelBore dia. d1(Small dia.)

Affixing method B: Clamp

Bore dia. d2(Large dia.)

Nominal rated torque（Refer to the specifications）

Mating shaft tolerance blank: h7 , K: k6 , M: m6 , J: j6 , S: 35 +0.010

0

Model

■ Standard bore diametersStandard bore diameters

d1･d2 [mm]

8●●

11

●●●●●

12

●●●●●●●

14

●●●●●●●

15

●●●●●●●

16

●●●●●●●

17

●●●●

18

●●●●●●

19

●●●●●●

20

●●

●●●

22

●●

●●●●●●●

24

●●

●●●●●●●

25

●●

●●●●●●●●●

28

●●

●●●●●●●●●

30

●●●●●●●

●●●

32

●●●●●●●

●●●●●●●

9●●

10

●●●●●

9.525

●●

d1d2d1d2d1d2d1d2d1d2d1d2d1d2d1d2d1d2d1d2d1d2d1d2

d1･d2 38

●●●●●●●

35

●●●●●●●

●●●●●●●

40

●●●●●●●

42

●●●●●●●

45

●●●●

48

●●●●

50

●●

55

●●

SFF-040SS

SFF-040SS

SFF-050SS

SFF-060SS

SFF-070SS

SFF-070SS

SFF-080SS

SFF-080SS

SFF-090SS

SFF-090SS

SFF-100SS

SFF-120SS

-8N

-12N

-25N

-60N

-90N

-100N

-150N

-200N

-250N

-300N

-450N

-600N

NEW

NEW

NEWNEW

NEWNEW

33334244444847474747565353565353706666666674848484

100

Model

■ Dimensions

D

[mm]

L

[mm]

d2

810101212241818202028222228222228252530303532323248

9.52516192222281919252535252535252535282832324248454555

d1N1

[mm]

333342444848475647565653565653707066746674748484

100100

N2

[mm]

LF

[mm]

S

[mm]

K

[mm]Tighteningtorque [N･m]

SFF-040SSSFF-040SSSFF-050SS

SFF-060SS

SFF-070SS

SFF-070SS

SFF-080SS

SFF-080SS

SFF-090SS

SFF-090SS

SFF-100SS

SFF-120SS

-8N-12N-25N

-60N

-90N

-100N

-150N

-200N

-250N

-300N

-450N

-600N

3838485858586868686868787878787878888888888898

118118118

38.938.948.453.453.453.455.955.955.955.955.968.368.368.367.767.767.768.368.368.368.368.390.290.290.290.2

17.517.521.52424242525252525303030303030303030303040404040

3.93.95.45.45.45.45.95.95.95.95.98.38.38.37.77.77.78.38.38.38.38.3

10.210.210.210.2

1717203232323838383838373737424242505050505056686868

2-M42-M42-M52-M62-M62-M52-M62-M62-M62-M62-M62-M82-M82-M62-M82-M82-M82-M82-M82-M82-M82-M8

2-M102-M102-M102-M10

3.43.47

14147

1414141414343414343434343434343468686868

Tighteningtorque [N･m]

3.43.47

1477

1414141414341414343434343434343468686868

Min.[mm]

Max.[mm]

810101224241828202828222828222828253530353532324848

1616192228282535253535253535253535324232424248455555

Min.[mm]

Max.[mm]

M1

Quantity -Nominal dia.

2-M42-M42-M52-M62-M52-M52-M62-M62-M62-M62-M62-M82-M62-M62-M82-M82-M82-M82-M82-M82-M82-M8

2-M102-M102-M102-M10

M2

Quantity -Nominal dia.

NEW

NEW

ＬＬＦＫ ＳClamp bolt Ｍ１ Clamp bolt Ｍ2

φｄ

１φ

Ｎ１

φＤ

φｄ

２

φＮ

２

Model

SFF-040SSSFF-040SSSFF-050SSSFF-060SSSFF-070SSSFF-070SSSFF-080SSSFF-080SSSFF-090SSSFF-090SSSFF-100SSSFF-120SS

-8N-12N-25N-60N-90N

-100N-150N-200N-250N-300N-450N-600N

812256090

100150200250300450600

0.020.020.020.020.020.020.020.020.020.020.020.02

111111111111

±0.2±0.2±0.3±0.3±0.5±0.5±0.5±0.5±0.6±0.6

±0.65±0.8

180001800018000180001800018000170001700015000150001300011000

150001500032000

104000240000240000120000310000520000520000740000970000

17417414539948448496

546321321540360

0.032×10－3

0.032×10－3

0.10×10－3

0.21×10－3

0.40×10－3

0.42×10－3

0.79×10－3

1.11×10－3

1.54×10－3

1.58×10－3

3.27×10－3

6.90×10－3

0.170.170.360.470.720.671.041.351.621.532.533.78

Ratedtorque

［N･m］

Misalignment

Parallel［mm］

Angular［°］

Axial［mm］

Max. rotationspeed

［min－1］

Torsionalstiffness

［N･m/rad］

Axialstiffness

［N/mm］

Momentof inertia［kg･m2］

Mass

［kg］

■ Specifications

* Max. rotation speed does not take into account dynamic balance. * Torsional stiffness values given are calculated for the element alone. * The moment of inertia and mass are measured for the maximum bore diameter.

NEW

NEW

SERVOFLEX SFF SS (N)

Single Element Type

006 MIKI PULLEY SERVOFLEX 007To download CAD data or product catalogs www.mikipulley.co.jp WEB CODE A002

How to Place an Order SFF-080SS-25BK-30BK-200N

Size

Type S: Single elementMaterial S: SteelBore dia. d1(Small dia.)

Affixing method B: Clamp

Bore dia. d2(Large dia.)

Nominal rated torque（Refer to the specifications）

Mating shaft tolerance blank: h7 , K: k6 , M: m6 , J: j6 , S: 35 +0.010

0

Model

■ Standard bore diametersStandard bore diameters

d1･d2 [mm]

8●●

11

●●●●●

12

●●●●●●●

14

●●●●●●●

15

●●●●●●●

16

●●●●●●●

17

●●●●

18

●●●●●●

19

●●●●●●

20

●●

●●●

22

●●

●●●●●●●

24

●●

●●●●●●●

25

●●

●●●●●●●●●

28

●●

●●●●●●●●●

30

●●●●●●●

●●●

32

●●●●●●●

●●●●●●●

9●●

10

●●●●●

9.525

●●

d1d2d1d2d1d2d1d2d1d2d1d2d1d2d1d2d1d2d1d2d1d2d1d2

d1･d2 38

●●●●●●●

35

●●●●●●●

●●●●●●●

40

●●●●●●●

42

●●●●●●●

45

●●●●

48

●●●●

50

●●

55

●●

SFF-040SS

SFF-040SS

SFF-050SS

SFF-060SS

SFF-070SS

SFF-070SS

SFF-080SS

SFF-080SS

SFF-090SS

SFF-090SS

SFF-100SS

SFF-120SS

-8N

-12N

-25N

-60N

-90N

-100N

-150N

-200N

-250N

-300N

-450N

-600N

NEW

NEW

NEWNEW

NEWNEW

33334244444847474747565353565353706666666674848484

100

Model

■ Dimensions

D

[mm]

L

[mm]

d2

810101212241818202028222228222228252530303532323248

9.52516192222281919252535252535252535282832324248454555

d1N1

[mm]

333342444848475647565653565653707066746674748484

100100

N2

[mm]

LF

[mm]

S

[mm]

K

[mm]Tighteningtorque [N･m]

SFF-040SSSFF-040SSSFF-050SS

SFF-060SS

SFF-070SS

SFF-070SS

SFF-080SS

SFF-080SS

SFF-090SS

SFF-090SS

SFF-100SS

SFF-120SS

-8N-12N-25N

-60N

-90N

-100N

-150N

-200N

-250N

-300N

-450N

-600N

3838485858586868686868787878787878888888888898

118118118

38.938.948.453.453.453.455.955.955.955.955.968.368.368.367.767.767.768.368.368.368.368.390.290.290.290.2

17.517.521.52424242525252525303030303030303030303040404040

3.93.95.45.45.45.45.95.95.95.95.98.38.38.37.77.77.78.38.38.38.38.3

10.210.210.210.2

1717203232323838383838373737424242505050505056686868

2-M42-M42-M52-M62-M62-M52-M62-M62-M62-M62-M62-M82-M82-M62-M82-M82-M82-M82-M82-M82-M82-M8

2-M102-M102-M102-M10

3.43.47

14147

1414141414343414343434343434343468686868

Tighteningtorque [N･m]

3.43.47

1477

1414141414341414343434343434343468686868

Min.[mm]

Max.[mm]

810101224241828202828222828222828253530353532324848

1616192228282535253535253535253535324232424248455555

Min.[mm]

Max.[mm]

M1

Quantity -Nominal dia.

2-M42-M42-M52-M62-M52-M52-M62-M62-M62-M62-M62-M82-M62-M62-M82-M82-M82-M82-M82-M82-M82-M8

2-M102-M102-M102-M10

M2

Quantity -Nominal dia.

NEW

NEW

ＬＬＦＫ ＳClamp bolt Ｍ１ Clamp bolt Ｍ2

φｄ

１φ

Ｎ１

φＤ

φｄ

２

φＮ

２

Model

SFF-040SSSFF-040SSSFF-050SSSFF-060SSSFF-070SSSFF-070SSSFF-080SSSFF-080SSSFF-090SSSFF-090SSSFF-100SSSFF-120SS

-8N-12N-25N-60N-90N

-100N-150N-200N-250N-300N-450N-600N

812256090

100150200250300450600

0.020.020.020.020.020.020.020.020.020.020.020.02

111111111111

±0.2±0.2±0.3±0.3±0.5±0.5±0.5±0.5±0.6±0.6

±0.65±0.8

180001800018000180001800018000170001700015000150001300011000

150001500032000

104000240000240000120000310000520000520000740000970000

17417414539948448496

546321321540360

0.032×10－3

0.032×10－3

0.10×10－3

0.21×10－3

0.40×10－3

0.42×10－3

0.79×10－3

1.11×10－3

1.54×10－3

1.58×10－3

3.27×10－3

6.90×10－3

0.170.170.360.470.720.671.041.351.621.532.533.78

Ratedtorque

［N･m］

Misalignment

Parallel［mm］

Angular［°］

Axial［mm］

Max. rotationspeed

［min－1］

Torsionalstiffness

［N･m/rad］

Axialstiffness

［N/mm］

Momentof inertia［kg･m2］

Mass

［kg］

■ Specifications

* Max. rotation speed does not take into account dynamic balance. * Torsional stiffness values given are calculated for the element alone. * The moment of inertia and mass are measured for the maximum bore diameter.

NEW

NEW

SERVOFLEX SFF SS (N)

Single Element Type

008 MIKI PULLEY SERVOFLEX 009To download CAD data or product catalogs www.mikipulley.co.jp WEB CODE A002

How to Place an Order SFF-080DS-25BK-30BK-200N

Size

Type D: Double elementMaterial S: SteelBore dia. d1(Small dia.)

Affixing method B: Clamp

Bore dia. d2(Large dia.)

Nominal rated torque（Refer to the specifications）

Mating shaft tolerance blank: h7 , K: k6 , M: m6 , J: j6 , S: 35 +0.010

0

型式

■ Standard bore diametersStandard bore diameters

d1･d2［mm］

8●●

11

●●●●●

12

●●●●●●●

14

●●●●●●●

15

●●●●●●●

16

●●●●●●●

17

●●●●

18

●●●●●●

19

●●●●●●

20

●●

●●●

22

●●

●●●●●●●

24

●●

●●●●●●●

25

●●

●●●●●●●●●

28

●●

●●●●●●●●●

30

●●●●●●●

●●●

32

●●●●●●●

●●●●●●●

9●●

10

●●●●●

9.525

●●

d1d2d1d2d1d2d1d2d1d2d1d2d1d2d1d2d1d2d1d2d1d2d1d2

d1･d2 38

●●●●●●●

35

●●●●●●●

●●●●●●●

40

●●●●●●●

42

●●●●●●●

45

●●●●

48

●●●●

50

●●

55

●●

SFF-040DS

SFF-040DS

SFF-050DS

SFF-060DS

SFF-070DS

SFF-070DS

SFF-080DS

SFF-080DS

SFF-090DS

SFF-090DS

SFF-100DS

SFF-120DS

-8N

-12N

-25N

-60N

-90N

-100N

-150N

-200N

-250N

-300N

-450N

-600N

NEW

NEW

NEWNEW

NEWNEW

33334244444847474747565353565353706666666674848484

100

Model

■ Dimensions

D

[mm]

L

[mm]

d2

810101212241818202028222228222228252530303532323248

9.52516192222281919252535252535252535282832324248454555

d1N1

[mm]

333342444848475647565653565653707066746674748484

100100

N2

[mm]

LF

[mm]

S

[mm]

K

[mm]Tighteningtorque [N･m]

SFF-040DSSFF-040DSSFF-050DS

SFF-060DS

SFF-070DS

SFF-070DS

SFF-080DS

SFF-080DS

SFF-090DS

SFF-090DS

SFF-100DS

SFF-120DS

-8N-12N-25N

-60N

-90N

-100N

-150N

-200N

-250N

-300N

-450N

-600N

3838485858586868686868787878787878888888888898

118118118

48.848.860.865.865.865.869.869.869.869.869.886.686.686.685.485.485.486.686.686.686.686.6

112.4112.4112.4112.4

17.517.521.52424242525252525303030303030303030303040404040

LP

[mm]

66777788888

101010101010101010101012121212

3.93.95.45.45.45.45.95.95.95.95.98.38.38.37.77.77.78.38.38.38.38.3

10.210.210.210.2

d3

[mm]

1717202929293737373737404040404040505050505052727272

1717203232323838383838373737424242505050505056686868

2-M42-M42-M52-M62-M62-M52-M62-M62-M62-M62-M62-M82-M82-M62-M82-M82-M82-M82-M82-M82-M82-M8

2-M102-M102-M102-M10

3.43.47

14147

1414141414343414343434343434343468686868

Tighteningtorque [N･m]

3.43.47

1477

1414141414341414343434343434343468686868

Min.[mm]

Max.[mm]

810101224241828202828222828222828253530353532324848

1616192228282535253535253535253535324232424248455555

Min.[mm]

Max.[mm]

M1

Quantity -Nominal dia.

2-M42-M42-M52-M62-M52-M52-M62-M62-M62-M62-M62-M82-M62-M62-M82-M82-M82-M82-M82-M82-M82-M8

2-M102-M102-M102-M10

M2

Quantity -Nominal dia.

NEW

NEW

Ｌ

ＬＦ ＬＰＫＳ

Clamp bolt Ｍ１

φｄ

１φ

Ｎ１

φＤ

φｄ

２

φＮ

２

φｄ

３

Clamp bolt Ｍ2

Model

SFF-040DSSFF-040DSSFF-050DSSFF-060DSSFF-070DSSFF-070DSSFF-080DSSFF-080DSSFF-090DSSFF-090DSSFF-100DSSFF-120DS

-8N-12N-25N-60N-90N

-100N-150N-200N-250N-300N-450N-600N

812256090

100150200250300450600

0.100.100.200.200.250.250.320.310.320.320.380.38

1 (On one side)1 (On one side)1 (On one side)1 (On one side)1 (On one side)1 (On one side)1 (On one side)1 (On one side)1 (On one side)1 (On one side)1 (On one side)1 (On one side)

±0.4±0.4±0.6±0.6±1.0±1.0±1.0±1.0±1.2±1.2±1.3±1.6

14000140001400014000140001400013000130001200012000100009000

75007500

1600052000

12000012000060000

155000260000260000370000485000

8787

72.5199.524224248

273160.5160.5270180

0.042×10－3

0.042×10－3

0.13×10－3

0.27×10－3

0.53×10－3

0.55×10－3

1.10×10－3

1.41×10－3

2.03×10－3

2.10×10－3

4.18×10－3

8.87×10－3

0.220.220.460.600.900.851.371.672.021.923.124.60

Ratedtorque

［N・m］

Misalignment

Parallel［mm］

Angular［°］

Axial［mm］

Max. rotationspeed

［min－1］

Torsionalstiffness

［N･m/rad］

Axialstiffness

［N/mm］

Momentof inertia［kg･m2］

Mass

［kg］

■ Specifications

* Max. rotation speed does not take into account dynamic balance. * Torsional stiffness values given are calculated for the element alone. * The moment of inertia and mass are measured for the maximum bore diameter.

NEW

NEW

SERVOFLEX SFF DS (N)

Double Element Type

008 MIKI PULLEY SERVOFLEX 009To download CAD data or product catalogs www.mikipulley.co.jp WEB CODE A002

How to Place an Order SFF-080DS-25BK-30BK-200N

Size

Type D: Double elementMaterial S: SteelBore dia. d1(Small dia.)

Affixing method B: Clamp

Bore dia. d2(Large dia.)

Nominal rated torque（Refer to the specifications）

Mating shaft tolerance blank: h7 , K: k6 , M: m6 , J: j6 , S: 35 +0.010

0

型式

■ Standard bore diametersStandard bore diameters

d1･d2［mm］

8●●

11

●●●●●

12

●●●●●●●

14

●●●●●●●

15

●●●●●●●

16

●●●●●●●

17

●●●●

18

●●●●●●

19

●●●●●●

20

●●

●●●

22

●●

●●●●●●●

24

●●

●●●●●●●

25

●●

●●●●●●●●●

28

●●

●●●●●●●●●

30

●●●●●●●

●●●

32

●●●●●●●

●●●●●●●

9●●

10

●●●●●

9.525

●●

d1d2d1d2d1d2d1d2d1d2d1d2d1d2d1d2d1d2d1d2d1d2d1d2

d1･d2 38

●●●●●●●

35

●●●●●●●

●●●●●●●

40

●●●●●●●

42

●●●●●●●

45

●●●●

48

●●●●

50

●●

55

●●

SFF-040DS

SFF-040DS

SFF-050DS

SFF-060DS

SFF-070DS

SFF-070DS

SFF-080DS

SFF-080DS

SFF-090DS

SFF-090DS

SFF-100DS

SFF-120DS

-8N

-12N

-25N

-60N

-90N

-100N

-150N

-200N

-250N

-300N

-450N

-600N

NEW

NEW

NEWNEW

NEWNEW

33334244444847474747565353565353706666666674848484

100

Model

■ Dimensions

D

[mm]

L

[mm]

d2

810101212241818202028222228222228252530303532323248

9.52516192222281919252535252535252535282832324248454555

d1N1

[mm]

333342444848475647565653565653707066746674748484

100100

N2

[mm]

LF

[mm]

S

[mm]

K

[mm]Tighteningtorque [N･m]

SFF-040DSSFF-040DSSFF-050DS

SFF-060DS

SFF-070DS

SFF-070DS

SFF-080DS

SFF-080DS

SFF-090DS

SFF-090DS

SFF-100DS

SFF-120DS

-8N-12N-25N

-60N

-90N

-100N

-150N

-200N

-250N

-300N

-450N

-600N

3838485858586868686868787878787878888888888898

118118118

48.848.860.865.865.865.869.869.869.869.869.886.686.686.685.485.485.486.686.686.686.686.6

112.4112.4112.4112.4

17.517.521.52424242525252525303030303030303030303040404040

LP

[mm]

66777788888

101010101010101010101012121212

3.93.95.45.45.45.45.95.95.95.95.98.38.38.37.77.77.78.38.38.38.38.3

10.210.210.210.2

d3

[mm]

1717202929293737373737404040404040505050505052727272

1717203232323838383838373737424242505050505056686868

2-M42-M42-M52-M62-M62-M52-M62-M62-M62-M62-M62-M82-M82-M62-M82-M82-M82-M82-M82-M82-M82-M8

2-M102-M102-M102-M10

3.43.47

14147

1414141414343414343434343434343468686868

Tighteningtorque [N･m]

3.43.47

1477

1414141414341414343434343434343468686868

Min.[mm]

Max.[mm]

810101224241828202828222828222828253530353532324848

1616192228282535253535253535253535324232424248455555

Min.[mm]

Max.[mm]

M1

Quantity -Nominal dia.

2-M42-M42-M52-M62-M52-M52-M62-M62-M62-M62-M62-M82-M62-M62-M82-M82-M82-M82-M82-M82-M82-M8

2-M102-M102-M102-M10

M2

Quantity -Nominal dia.

NEW

NEW

Ｌ

ＬＦ ＬＰＫＳ

Clamp bolt Ｍ１

φｄ

１φ

Ｎ１

φＤ

φｄ

２

φＮ

２

φｄ

３

Clamp bolt Ｍ2

Model

SFF-040DSSFF-040DSSFF-050DSSFF-060DSSFF-070DSSFF-070DSSFF-080DSSFF-080DSSFF-090DSSFF-090DSSFF-100DSSFF-120DS

-8N-12N-25N-60N-90N

-100N-150N-200N-250N-300N-450N-600N

812256090

100150200250300450600

0.100.100.200.200.250.250.320.310.320.320.380.38

1 (On one side)1 (On one side)1 (On one side)1 (On one side)1 (On one side)1 (On one side)1 (On one side)1 (On one side)1 (On one side)1 (On one side)1 (On one side)1 (On one side)

±0.4±0.4±0.6±0.6±1.0±1.0±1.0±1.0±1.2±1.2±1.3±1.6

14000140001400014000140001400013000130001200012000100009000

75007500

1600052000

12000012000060000

155000260000260000370000485000

8787

72.5199.524224248

273160.5160.5270180

0.042×10－3

0.042×10－3

0.13×10－3

0.27×10－3

0.53×10－3

0.55×10－3

1.10×10－3

1.41×10－3

2.03×10－3

2.10×10－3

4.18×10－3

8.87×10－3

0.220.220.460.600.900.851.371.672.021.923.124.60

Ratedtorque

［N・m］

Misalignment

Parallel［mm］

Angular［°］

Axial［mm］

Max. rotationspeed

［min－1］

Torsionalstiffness

［N･m/rad］

Axialstiffness

［N/mm］

Momentof inertia［kg･m2］

Mass

［kg］

■ Specifications

* Max. rotation speed does not take into account dynamic balance. * Torsional stiffness values given are calculated for the element alone. * The moment of inertia and mass are measured for the maximum bore diameter.

NEW

NEW

SERVOFLEX SFF DS (N)

Double Element Type

010 MIKI PULLEY SERVOFLEX MIKI PULLEY SERVOFLEX 011

■ Differences in torsional stiffness due to element shape

Couplingsize

040050・060

060・070・080080・090100・120

M4M5M6M8

M10

3.47

143468

Nominal boltdiameter

Tightningtorque [N･m]

N50LTDKN100LTDKN230LCKN450LCK

N900SPCK × 68N･m

Torquedriver or wrench

SB 3mmSB 4mm

230HCK 5mm450HCK 6mm900HCK 8mm

Hexagonbit or head

■ Compatible torque driver and wrench

■ Removal

Model

SquareSquareSquare

HexagonHexagonHexagonSquare

HexagonHexagonHexagonHexagonHexagon

SFF-040SS/DSSFF-040SS/DSSFF-050SS/DSSFF-060SS/DSSFF-070SS/DSSFF-070SS/DSSFF-080SS/DSSFF-080SS/DSSFF-090SS/DSSFF-090SS/DSSFF-100SS/DSSFF-120SS/DS

-8N-12N-25N-60N-90N

-100N-150N-200N-250N-300N-450N-600N

Element shape

Adjust runout using the same procedure as for the motor shaft side, and then finish by tightening the clamp bolts to the appropriate tightening torque.

(9)

Check to confirm that there is no torque or axial load being applied to the coupling. There may be cases where a torque is applied to the coupling, particularly when the safety brake is being used, for example. Make sure to verify that this is not occurring before removing parts.

(1)

Release the fastening to the shaft by sufficiently loosening all clamp bolts. Grease has been applied to the clamping bolts, so do not remove them all the way. Since two clamp bolts were used to fasten to the shaft, loosening only one will decrease the axial force of the other clamp bolt. Note that this is not the bolt loosening that occured during operation.

Elements used by SFF (N) models may be either square or hexago-nal. Since torque is transmitted by placing bolts at each vertex and coupling the hubs to each other via the element, torsional stiffness is higher in couplings that use hexagonal elements, at the expense of some flexibility. Choose your element shape accordingly.

(2)

To protect against initial loosening of the clamp bolt, we recom-mend operating for a set period of time and then retightening to the appropriate tightening torque.

(10)

Model

3.93.95.45.45.95.98.37.78.38.3

10.210.2

SFF-040SS/DSSFF-040SS/DSSFF-050SS/DSSFF-060SS/DSSFF-070SS/DSSFF-070SS/DSSFF-080SS/DSSFF-080SS/DSSFF-090SS/DSSFF-090SS/DSSFF-100SS/DSSFF-120SS/DS

-8N-12N-25N-60N-90N

-100N-150N-200N-250N-300N-450N-600N

S dimension [mm]

Ｓ

M4M5M6M8

M10

3.47

143468

Nominal clump bolt diameter Tightning torque [N･m]

Ａ

Ｂ

ＮOGOODGOOD

Alternately fasten the two clamp bolts as you adjust them, and finish by tightening both bolts to the appropriate tightening torque of the following table, using a calibrated torque wrench.Since it is fastened by two clamp bolts, tightening one bolt before the other will place more than the prescribed axial force on the bolt tightened first when the other bolt is tightened. Be sure to tighten them alternately, a little at a time.

(5)

Mount the motor, to which the coupling has already been mounted, on the body of the machinery.At that time, adjust the motor mounting position (centering location) while inserting the coupling onto the driven shaft (a feed screw or the like), being alert to undue forces on the element such as compression or pulling.

(6)

Make the length of the driven shaft (feed screw or the like) inserted into the coupling connect to the shaft for the length of the LF dimension (described above), alternately tighten the two clamp bolts, and provisionally tighten enough that the coupling cannot be manually rotated.

(7)

In addition, keep the dimension between clamp hub faces (the S dimension in the diagram) to within the allowable misalign-ment of the axial displacement with respect to a reference value. Note that the tolerance values were calculated based on the assumption that both the level of parallel misalignment and angular deflection are zero. Adjust to keep this value as low as possible.

(8)

■ Precautions for handling ■ Mounting

LF LF

SFF (N) models come pre-assembled. Couplings are assembled at high accuracy using a special mounting jig to ensure accurate concentricity of left and right internal diameters.Take extra precautions when handling couplings, should strong shocks be given on couplings, it may affect mounting accuracy and cause the parts to break during use.

Couplings are designed for use within an operating tempera-ture range of －30℃ to 120℃. Although the couplings are designed to be waterproof and oilproof, do not subject them to excessive amounts of water and oil as it may cause part deterioration.

Handle the element with care as it is made of a thin stainless steel metal disk, also making sure to be careful so as not to injure yourself.

(1)

(2)

Do not tighten up clamp bolts until after inserting the mounting shaft.

(3)

Check that coupling clamp bolts have been loosened and remove any rust, dust, oil residue, etc. from the inner diameter surfaces of the shaft and couplings. (Use a waste cloth, etc. to wipe away oil residue or an oil remover as needed.)

(1)

Be careful when inserting the couplings into the shaft so as not to apply excessive force of compression or tensile force to the element.

(2)

Make the length of the coupling inserted onto the motor shaft connect to the shaft for the entire length of the clamp hub of the coupling (LF dimension) as shown below, alternately tighten the two clamp bolts, and provisionally tighten enough that the coupling cannot be manually rotated.

(3)

Hold a dial gauge against the outer diameter of the clamp hub on the motor shaft side (the surface processed simultaneously with the inner diameter), and then tighten the two clamp bolts while turning the motor shaft by hand and adjusting the difference in the runout values at A and B in the figure below is 0.02 mm or less (and as close to 0 as possible).

(4)

Model

SFF-040SS/DSSFF-040SS/DSSFF-050SS/DSSFF-060SS/DSSFF-070SS/DSSFF-070SS/DSSFF-080SS/DSSFF-080SS/DSSFF-090SS/DSSFF-090SS/DSSFF-100SS/DSSFF-120SS/DS

-8N-12N-25N-60N-90N

-100N-150N-200N-250N-300N-450N-600N

LF dimension [mm]

17.517.521.5242525303030304040

SERVOFLEX SFF (N)

Items Checked for Design Purposes

010 MIKI PULLEY SERVOFLEX MIKI PULLEY SERVOFLEX 011

■ Differences in torsional stiffness due to element shape

Couplingsize

040050・060

060・070・080080・090100・120

M4M5M6M8

M10

3.47

143468

Nominal boltdiameter

Tightningtorque [N･m]

N50LTDKN100LTDKN230LCKN450LCK

N900SPCK × 68N･m

Torquedriver or wrench

SB 3mmSB 4mm

230HCK 5mm450HCK 6mm900HCK 8mm

Hexagonbit or head

■ Compatible torque driver and wrench

■ Removal

Model

SquareSquareSquare

HexagonHexagonHexagonSquare

HexagonHexagonHexagonHexagonHexagon

SFF-040SS/DSSFF-040SS/DSSFF-050SS/DSSFF-060SS/DSSFF-070SS/DSSFF-070SS/DSSFF-080SS/DSSFF-080SS/DSSFF-090SS/DSSFF-090SS/DSSFF-100SS/DSSFF-120SS/DS

-8N-12N-25N-60N-90N

-100N-150N-200N-250N-300N-450N-600N

Element shape

Adjust runout using the same procedure as for the motor shaft side, and then finish by tightening the clamp bolts to the appropriate tightening torque.

(9)

Check to confirm that there is no torque or axial load being applied to the coupling. There may be cases where a torque is applied to the coupling, particularly when the safety brake is being used, for example. Make sure to verify that this is not occurring before removing parts.

(1)

Release the fastening to the shaft by sufficiently loosening all clamp bolts. Grease has been applied to the clamping bolts, so do not remove them all the way. Since two clamp bolts were used to fasten to the shaft, loosening only one will decrease the axial force of the other clamp bolt. Note that this is not the bolt loosening that occured during operation.

Elements used by SFF (N) models may be either square or hexago-nal. Since torque is transmitted by placing bolts at each vertex and coupling the hubs to each other via the element, torsional stiffness is higher in couplings that use hexagonal elements, at the expense of some flexibility. Choose your element shape accordingly.

(2)

To protect against initial loosening of the clamp bolt, we recom-mend operating for a set period of time and then retightening to the appropriate tightening torque.

(10)

Model

3.93.95.45.45.95.98.37.78.38.3

10.210.2

SFF-040SS/DSSFF-040SS/DSSFF-050SS/DSSFF-060SS/DSSFF-070SS/DSSFF-070SS/DSSFF-080SS/DSSFF-080SS/DSSFF-090SS/DSSFF-090SS/DSSFF-100SS/DSSFF-120SS/DS

-8N-12N-25N-60N-90N

-100N-150N-200N-250N-300N-450N-600N

S dimension [mm]

Ｓ

M4M5M6M8

M10

3.47

143468

Nominal clump bolt diameter Tightning torque [N･m]

Ａ

Ｂ

ＮOGOODGOOD

Alternately fasten the two clamp bolts as you adjust them, and finish by tightening both bolts to the appropriate tightening torque of the following table, using a calibrated torque wrench.Since it is fastened by two clamp bolts, tightening one bolt before the other will place more than the prescribed axial force on the bolt tightened first when the other bolt is tightened. Be sure to tighten them alternately, a little at a time.

(5)

Mount the motor, to which the coupling has already been mounted, on the body of the machinery.At that time, adjust the motor mounting position (centering location) while inserting the coupling onto the driven shaft (a feed screw or the like), being alert to undue forces on the element such as compression or pulling.

(6)

Make the length of the driven shaft (feed screw or the like) inserted into the coupling connect to the shaft for the length of the LF dimension (described above), alternately tighten the two clamp bolts, and provisionally tighten enough that the coupling cannot be manually rotated.

(7)

In addition, keep the dimension between clamp hub faces (the S dimension in the diagram) to within the allowable misalign-ment of the axial displacement with respect to a reference value. Note that the tolerance values were calculated based on the assumption that both the level of parallel misalignment and angular deflection are zero. Adjust to keep this value as low as possible.

(8)

■ Precautions for handling ■ Mounting

LF LF

SFF (N) models come pre-assembled. Couplings are assembled at high accuracy using a special mounting jig to ensure accurate concentricity of left and right internal diameters.Take extra precautions when handling couplings, should strong shocks be given on couplings, it may affect mounting accuracy and cause the parts to break during use.

Couplings are designed for use within an operating tempera-ture range of －30℃ to 120℃. Although the couplings are designed to be waterproof and oilproof, do not subject them to excessive amounts of water and oil as it may cause part deterioration.

Handle the element with care as it is made of a thin stainless steel metal disk, also making sure to be careful so as not to injure yourself.

(1)

(2)

Do not tighten up clamp bolts until after inserting the mounting shaft.

(3)

Check that coupling clamp bolts have been loosened and remove any rust, dust, oil residue, etc. from the inner diameter surfaces of the shaft and couplings. (Use a waste cloth, etc. to wipe away oil residue or an oil remover as needed.)

(1)

Be careful when inserting the couplings into the shaft so as not to apply excessive force of compression or tensile force to the element.

(2)

Make the length of the coupling inserted onto the motor shaft connect to the shaft for the entire length of the clamp hub of the coupling (LF dimension) as shown below, alternately tighten the two clamp bolts, and provisionally tighten enough that the coupling cannot be manually rotated.

(3)

Hold a dial gauge against the outer diameter of the clamp hub on the motor shaft side (the surface processed simultaneously with the inner diameter), and then tighten the two clamp bolts while turning the motor shaft by hand and adjusting the difference in the runout values at A and B in the figure below is 0.02 mm or less (and as close to 0 as possible).

(4)

Model

SFF-040SS/DSSFF-040SS/DSSFF-050SS/DSSFF-060SS/DSSFF-070SS/DSSFF-070SS/DSSFF-080SS/DSSFF-080SS/DSSFF-090SS/DSSFF-090SS/DSSFF-100SS/DSSFF-120SS/DS

-8N-12N-25N-60N-90N

-100N-150N-200N-250N-300N-450N-600N

LF dimension [mm]

17.517.521.5242525303030304040

SERVOFLEX SFF (N)

Items Checked for Design Purposes

SERVOFLEX SFF (N)High performance metal disk coupling

'14.10-1.5-MP-SFFN(en)-002C

■ Selection

SERVOFLEX SFF (N)

Items Checked for Design Purposes

Tn [N･m] ≧ Td [N･m]

Loadproperties

Constant Vibration:Small Vibration:Medium Vaibration:Large

K 1.0 1.25 1.75 2.25

Td [N･m] = Ta [N･m] × K (see below)

Td [N･m] = TS [N･m] × (1.2 to 1.5)

Ta [N･m] ＝ 9550 × n [min－1]P [kW]

Find the torque Ta applied to the coupling using the output capacity, P, of the driver and the usage speed, n.

(1)

Determine the factor K from the load properties, and find the corrected torque, Td, applied to the coupling.

For servo motor drive, multiply the maximum torque, Ts, by the usage factor K = 1.2 to 1.5.

(2)

Set the size so that the rated coupling torque, Tn, is higher than the corrected torque, Td.

(3)

Check that the mount shaft is no larger than the maximum bore diameter of the coupling.

(4)

Contact MIKI PULLEY for assistance with any device experi-encing extreme periodic vibrations.

*

■ How to find the natural frequency of a feed screw system

■ Points to consider regarding the feed screw systemWhen the torsional natural frequency of the overall feed screw system is 400 to 500 Hz or less, gain adjustment of the servo motor may cause the servo motor to oscillate.Ocsillation in the servo motor during operation can cause problems particularly with the overall natural frequency and electrical control systems of the feed screw system. In order for these issues to be resolved, the torsional stiffness for the coupling and feed screw section and the moment of inertia and other characteristics for the system overall will need to be adjusted and the torsional natural frequency for the mechanical system raised or the tuning function (filter function) for the electrical control system in the servo motor adjusted during the design stage.Please contact Miki Pulley with any questions regarding servo motor oscillation.

Select a coupling based on the nominal and maximum torque of the servo motor.

(1)

Find the overall natural frequency, Nf, from the torsional stiffness of the coupling and feed screw, κ, the moment of inertia of driving side, J1, and the moment of inertia of driven side, J2, for the feed screw system shown below.

(2)

Motor Feed screw

Bearing

TableCoupling

Nf：Overall natural frequency of a feed screw system [Hz]κ：Torsional stiffness of the coupling and feed screw [N･m/rad]J1：Moment of inertia of the driver [kg･m²]J2：Moment of inertia of the follower [kg･m²]

Nf = 2π1

J1 J2K +1 1

J1J2

κ