AF-M

Flexible couplings

 

FIAMA flexible shafts are mechanical devices that are used to transfer, with the highest precision, a rotary movement between two non-aligned shafts. Installation is extremely simple by connecting the two terminals (various types are available) without the need for other supports.
Terminals made of stainless steel AISI 303. 
Protective cover made of “Rilsan” for lengths over 400mm.
• Limited dimensions, weight, inertia 
• Robust and highly reliable, not subject to wear and maintenance 
• Excellent compensation of misalignments without free play 
• Compact space requirements, max recommended length 400mm
• Same rotation speed of both shafts, silent operation, dampening of vibrations and shocks.

The limited cost and easy installation allow various solutions, even in heavy-duty applications such as:machine tools, equipment automation, automatic machines, robots, etc.


Photogallery

1. Nr. 3 screws at 120°

 DIMENSION TABLE

 VERSION  FLEXIBLE SHAFT EXTERNAL COVER TERMINAL  EFFECTIVE (L)  INNER TERMINAL BORE DEPTH

KEYWAY 

COVER TERMINAL  TERMINAL (L)
   Ø A  Ø B  Ø C D Ø E   F  G  Ø L
AF6M 6 12 12 30 6 20 = 15 45
AF8M 14  15  30  20  20  45 
AF12M  12  20  17  37  10  26  26  56 
AF15M  15  22  20  37  10  26  28  56 
AF20M  20  35  25  45  14  32  34  72 
The data refers to length L=1000mm

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EFFICIENCY TABLE
VERSION TORSION MIN. BENDING RADIUS TORQUE WEIGHT
  (°) mm Nm gr
AF6M 80  70  3  800
AF8M 70  90  4.5  1100 
AF12M 50  160  1600 
AF15M 28  300  12  2100 
AF20M 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 T [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 r (dimensionless parameter which characterizes the asymmetric behavior of the shaft) 

  φ = T . L  
        rk
  T = rk . φ
         L
  

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]

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.