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Unsupported | Short travels

The FL G type of installation
always generates the
longest service life and
can be operated with the
max. values for speed and
acceleration

Example for unsupported straight FL G
FL G FL B
H F R H H F R H
S/2 S/2
S S
Unsupported
If the upper run of the e-chain ® operates without touching the lower run over the entire travel, it is
called an unsupported application. The distance between moving end and the beginning of the
radius curve of the e-chain ® is called the unsupported length. The unsupported application is
1. the most common. igus ® e-chains ® are very well suited for high dynamics and long service life.
2. The maximum unsupported length depends on the fi ll weight and the type of e-chain ® or e-tube.
As a result, we diff erentiate among three types of unsupported length:
3.
1. Unsupported with 1. Unsupported with straight upper run FL G
The e-chain ® is unsupported FL G when the upper run still has camber, is straight or has a maximum
straight upper run FL G
2. Unsupported with sag of 1/2 of the e-chain ® link height. Installing the e-chain ® in FL G is always recommended. The
e-chain ® runs smoothly without additional vibration.
permitted sag FL B
3. Critical sag
2. Unsupported with permitted sag FL G
The e-chain ® is unsupported FL B when the sag is more than 1/2 e-chain ® link height and less
than the smallest available radius of this e-chain ® series. In most applications the e-chain ® can
be used unsupported FL B without any problems. There are restrictions concerning the maximum
speed and acceleration.

3. Critical sag
When the sag of the e-chain ® is higher than allowed for FL B , it is in critical sag. Using an e-chain ®
in critical sag should be avoided or solved with special solutions. An e-chain ® should never be
installed with critical sag. Applications may reach critical sag after long service times. The e-chain ®
or e-tube should be replaced in these cases.

116 More information  www.igus-asean.com

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