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igus® inc.

PO BOX 14349

East Providence

RI 02914

+1 800 521 2747
+1 401 438 7270

twisterchain selection

1. Determine series and chain width

Specify which cables you would like to use for the chain. The type of cable(s) and the largest cable diameter determine the series and chain width selection. We recommend that you allow for a cable clearance of approx. 20% of the chain's inner height and width. For instance, you must choose Series 3808 for a cable diameter of 1.18 (30 mm).


2. Specify the outer and inner radius

Determine the installation space available to you (dimension X1 and X2)
example: α = 220° / max. cable diameter 0.94 (24 mm) -> Series 2808
X2 = 22.83 (580 mm) -> AR = 19.69 (500 mm)
X1 = 12.20 (310 mm) -> IRmin. = 15.35 (390 mm) -> Selection table -> 15.43 (392 mm)


3. Specify the bend radius

HF = 18.11 (460 mm) -> H ≤ 16.14 (410 mm) -> R = = 7.00 (178 mm) -> R175*
*next smallest radius
Result: Series 2808, Part No. 2808-087-175/500


4. Calculate the required number of links

  • Always round up the calculated number of links
  • The mounting brackets may only be mounted to the outer links of the twisterchain, so the number of links must always be rounded up to the next odd number

Links formula for cable cararier n = number of links

cable carrier upper limitation C = Upper limitation

Legend

a = Acceleration
α = Angle of rotation
AR = Outer energy chain radius
Ba = Outer energy chain width
Bi = Inner energy chain width
FZmax = Max. Additional load
H = Nominal clearance height
ha = Outer energy chain height
hi = Inner energy chain height
HF = Required clearance height incl. 1.97" (50 mm) clearance
IR = Inner energy chain radius
K = Series-dependent add-on for bend radius
n = Number of links
R = energy chain bend radius
T = Pitch
v = Speed
X1 = Interior installation space
X2 = Outer radius incl. clearance
RLK = Distance pivot point / outer mounting holes


cable carrier with external limit A = external limit
B = machine

The following clearances are absolutely essential for the chain to function correctly:

IRmin. = X1 + 3.15" (80 mm)

X2 min = AR + 3.15" (80 mm)

HF = H + 1.97" (50 mm)

Chain height including clearance


Recommendations for design without additional components

energy chainFZmax.FZmax.v to ARa to ARBRAR
Seriesα 180°α 360°Permitted[ft/s²]max.Permitted
 [lbs/ft][lbs/ft][ft/s]max.[in][in]
 
2208.0.670.670.98 - 3.286.563.9411.81
2808.1.340.670.98 - 3.286.565.9117.71 - 21.63
3808.2.021.210.98 - 3.286.567.8717.71 - 21.63
4008.2.681.680.98 - 3.286.569.8423.62 - 27.56

If your calculations exceed our recommendations, please contact us. We offer special solutions and many additional components.