FAP-M

Self-supporting flexible shaft

Innovative and simple, the new self-supporting flexible shaft allows easy installation wihtout fixing the protective cover.

● Reinforced steel cover 
 Universally applicable, it is ideal for new projects and upgrades
 High performance and rotation
Highly smooth rotation on ball bearings
 Misalignement compensation and vibration damping
 Maximum  accuracy in torque transmission
 High wear resitance

Photogallery

CYLINDRICAL TERMINAL «C»                                                               FLANGED TERMINAL «F»

1. Nr. 3 screws at 120°

DIMENSION TABLE
 VERSION FLEXIBLE SHAFT ESTERNAL COVER  TERMINAL COVER  EFFECTIVE (L)  INNER TERMINAL  BORE DEPTH KEYWAY 
   Ø A Ø B  Ø C  Ø E  G
FAP6M   6 14 12 16 6 12  =
FAP8M   8 17  15  22  20 
FAP12M  12  25  17  26  10  26 
FAP15M  15  30  20  26  10  26 
FAP20M 20  35  25  35  14  32 
The data refers to length L=1000mm

 

CYLINDRICAL TERMINAL  «C»  
DIMENSION TABLE
FLEXIBLE SHAFT EXTERNAL COVER COVER TERMINAL
Ø A  Ø B  C
6 22 18.5
28  24 
12  35  35 
15  36  37 
20  42  41 
FLANGED TERMINAL «F»  
DIMENSION TABLE
FLEXIBLE SHAFT ESTERNAL COVER COVER TERMINAL (L) FLANGE FLANGE WIDTH FIXING BORES FIXING SCREWS
Ø A  Ø B  C Ø D E Ø F Ø G
6 22 18.5 38 11 30 3.2 
28  24  45  36  4.2 
12  35  35  55  45  4.2 
15  36  37  60  48  5.2 
20  42  41  65  52  5.2 

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EFFICIENCY TABLE
VERSION TORSION MIN. BENDING RADIUS TORQUE WEIGHT
  (°) mm Nm gr
FAP6M 80  70  3  800
FAP8M 70  90  4.5  1100 
FAP12M 50  160  1600 
FAP15M 28  300  12  2100 
FAP20M 18  400  18.5  3300 

The data refers to length L=1000mm 

 

MECHANICAL CHARACTERIZATION OF FLEXIBLE SHAFTS


Flexible shafts are mechanical elements which are subject to torque and undergo a rotational elastic deformation. Considering a single flexible shaft, the equal and opposite torques which are applied at each extremity cause a relative rotation of the various sections which is proportional to the distance between the sections. The relation between Applied Torque [Nm] and Twist Angle of the extremities φ [°] is a function of three parameters as follows: 

Torsional Rigidity k [103Nm/°] which depends on the section diameter and its construction characteristics
Length of the shaft L [mm]
 Rotation Direction (dimensionless parameter which characterizes the asymmetric behavior of the shaft) 

Parameter r is equal to 1 when the shaft is loaded according to the winding direction of the spiral; when loaded in the opposite direction, r < 1 as indicated in the following table:

PARAMETERS OF FLEXIBLE SHAFT
Diameter Ø

k
[103Nm/°]

r

Tmax
[Nm]

φ [°]
(L=1000mm, Tmax) 
4 17 0.55  1.1 64.71
26 0.55 1.8 

                   69.23 

38  0.55  3.0  78.95 
8 67  0.55  4.5  67.16 
10  101  0.55  7.5  74.26 
12  180  0.65  9.0  50.00 
15  405  0.80  12.5  30.86 
20  1050  0.85  18.5  17.62 

 

BENDING EFFICIENCY  

The above shows a qualitative-quantitative curve of the efficiency of the flexible shaft as a function of the bending radius. 
For configurations which are almost in a straight line, the efficiency is equal to the maximum value 0.9. 
The efficiency is nearly constant for high values of the bending radius and decreases rapidly down to 0.2 as the minimum bending radius is approached.

     

1. Efficiency 
2. 
Bending radius/R min.    

DIAGRAM SHOWING TWIST ANGLE VS TORQUE FOR SHAFTS WITH A TOTAL LENGTH  L=1000mm

 

  FOR DIAMETERS FROM Ø4 TO Ø10


1. Twist angle φ [°]
2. Torque (Nm)

 FOR DIAMETERS FROM Ø12 TO Ø20


1. Twist angle φ [°]
2. Torque (Nm)

 GENERAL EFFICIENCY TABLE

1. Power P (kw)
2. Rotation per minute (rpm)

- To identify the most suitable flexible shaft for your requirements, refer to the values in the table. If the real loads and efficiency are very close to the table values, contact the technical department.
- To choose the most suitable flexibel shaft, we advise to consult the figures, tables, and the technical data shown in the “General Information” of this site.
- All tables show linear measurements expressed in <mm>, unless otherwise specified. All forces, efficiency and the loads are expressed in <N or Nm> (10 N ≅ 1 kg or 10Nm ≅ 1Kgm) unless otherwise specified.