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FLEXIBLE SHAFT COULPINGS
FOR SHAFT MISALIGNMENT COMPENSATION

Zero Backlash

One Piece Construction

High Flexibility

Constant Velocity

No Wearing Parts

No Lubrication Required 

Ideal for:

stepper motors
servomotors
shaft encoders
ballscrews
gearboxes
tachogenerators
potentiometers
transducers
linear drives
 


 

When installing stepper or servo motors, gearboxes and encoders in machines, care must be taken to ensure all devices are co-axial, i.e. no angular or parallel misalignment. Failure to do so may place excessive loads on bearings and reduce life of the components.

Using flexible couplings with some angular and parallel compliance will ensure this while maintaining constant velocity and backlash.



The coupling consists of several helical slots cut into a solid cylindrical section forming beams. Because the couplings are machined from a single section, they have constant velocity and do not contribute to backlash in position control systems. Both 6 beam and 3 beam couplings are available. Six beam couplings have greater flexibility where 3 beam couplings are suited to applications where space is limited.

The multibeam couplings are available in aluminium alloy, carbon steel and stainless steel. Both setscrew and clamp shaft fixings are available. The clamp style is more expensive but have better shaft locking ability in high torque applications.

Couplings can be supplied with custom bores or small diameter pilot bores at each end enabling easy boring in a lathe.

SHAFT FIXING
 

SETSCREW FIXING

Recommended for low cost applications where torque is low.

CLAMP FIXING

Recommended for higher torque applications or where shaft damage cannot be tolerated.

DIMENSIONS

DIMENSIONS
 

PARALLEL OFFSET


 

ANGULAR OFFSET

 


ALUMINIUM COUPLINGS (6 beam)

SIZE 

 MODEL
(setscrew)

MODEL
(clamp)

D

L

B

R1
(min)

R2
(min)

R1,R2
(max)

ANGULAR
OFFSET

PARALLEL
OFFSET

TORQUE
(peak)
     

mm

mm

mm

mm

mm

mm 

+/- deg. 

+/-mm 

Nm 

2

NAS2

NAC2 

9.5

19.6

5.3

1.9

2.8

4.75

3

0.12

1.0

3

NAS3

NAC3 

12.7

22.9

6.5

2.8

4.4

6.35

5

0.17

2.0

3.5

NAS3.5

NAC3.5

15.9

25.4

6.5

2.8

4.8

8.0

5

0.20

3.4

4

NAS4

NAC4 

19.1

26.5

6.5

4.4

5.8

10.0

7

0.25

5.3

5

NAS5

NAC5 

25.4

38.1

11.0

5.8

7.5

12.7

7

0.37

10.0

6

NAS6

NAC6 

31.8

57.2

16.0

5.8

9.8

19.0 (setscrew)
16.0 (clamp)

7

0.50

15.0

7

NAS7

NAC7 

38.1

66.7

18.0

7.8

11.8

22.0 (setscrew)
19.0 (clamp)

7

0.60

22.0


ALUMINIUM COUPLINGS (3 Beam)

SIZE 

 MODEL
(setscrew)

MODEL
(clamp)

D

L

B

R1
(min)

R2
(min)

R1,R2
(max)

ANGULAR
OFFSET

PARALLEL
OFFSET

TORQUE
(peak)
     

mm

mm

mm

mm

mm

mm 

+/- deg. 

+/-mm 

Nm 

2

RAS2

RAC2 

9.5

14.2

4.5

1.9

2.8

4.0

3

0.10

0.4

3

RAS3

RAC3 

12.7

19.1

6.1

2.8

3.8

5.0

5

0.127

0.9

3.5

RAS3.5

RAC3.5

15.9

20.3

6.5

2.8

3.8

6.35

5

0.127

1.5

4

RAS4

RAC4 

19.1

22.9

6.5

2.8

4.8

8.0

5

0.127

2.5

5

RAS5

RAC5 

25.4

31.8

9.0

4.8

5.8

11.0

5

0.127

4.0

6

RAS6

RAC6 

31.8

44.5

12.0

5.8

7.8

14.0

5

0.127

6.0


Couplings also available in stainless and carbon steel. Contact Office for larger sizes.

AUTOMATED MOTION SYSTEMS PTY. LTD. - WESTERN AUSTRALIA