SMC Networks CY3B Series Operation Manual page 9

Wrong example
Cylinder
body
Load
Mo
Since the cylinder is subject to direct moment
of load, guide shaft can work as only
non-rotation and operating failure may be
caused.
In wrong example shown of Fig. 3-2 [Ex.-2] (with external slider mounted directly on load base), the
misalignment between guide (orbit) and cylinder is not compensated and may induce operating failure. To
eliminate the misalignment and deflection of cylinder by self-weight, clearance is provided between
mounting bracket and cylinder as shown on correct example. Additionally, the mounting bracket should
be longer than center of axis of cylinder to minimize the moment applied to the external slider.
If the cylinder is mounted as shown on wrong example from Ex.1 to 4, external slider clamped is cylinder
tube strongly during operation and the wearing is worn so much as to cause operating failure.
As alternative solution for misalignment between cylinder and load, the rodless cylinder with specific
bracket (floating joint) is also by addition of -XC57 to suffix of part no. (Fig. 3-5) However, the floating joint
block obtained by –XC57 can't be mounted to standard cylinder because –XC57 is adopting specific
external slider. Therefore, if –XC57 spec. is required for standard cylinder purchased independently, the
cylinder needs to be sent to SMC factory for repair with description of request "-XC57 spec."
Guide shaft
Fig.3-4 [Ex.-4]
Floating joint
Body
Fig. 3-5 [Ex.-5] (-XC57)
7
Correct example
Guide by LM guide
Load
The load is supported by guide shaft and the
clearance is provided to compensate misalignment.
The bracket is longer than center of axis of cylinder
to prevent moment applied to external slider.
Center
of axis
C
Bracket