The Ideal Configuration - Phoenix Mecano RK ROSE+KRIEGER Powerlift M Memory Notice D'assemblage

7.3.5 The ideal configuration

With a synchro system, the positions are supposed to be con-
trolled during movement such that all lifting columns have
exactly the same height at all times. In practice, this is impos-
sible, because a controller must first detect a deviation be-
fore it can correct it. This means for the synchro system that
a deviation from an ideal synchronous move must always be
allowed.
Particular requirements are therefore placed on the connec-
tions between table frame and lifting column. Ideally, the
table design allows a certain freedom of movement.
As a rule, lifting columns are on heavy bases. These guarantee the stability of the table. The con-
nection between base and lifting column does not allow linear and rotational movements. Con-
sequently, we can speak about a rigid connection, even if the bases are not interconnected. Ease
of movement must therefore be created at the top connection to the table plate.
Owing to the control deviation, it must be possible to compensate for slight height differences by
table design. Therefore it is sensible if the connection between lifting column and table frame is
supported so that slight rotation is possible or that the table plate has the required flexibility.
Avoid countersunk screws for fastening the table frame. These are centred in the drilled holes
with solid bolts. If the drilling pattern in the table frame is not identical to that in the lifting col-
umn, this leads to stresses or even destroys the threads. It is better if the drilled holes are some-
what larger than the fixing bolts used. Inaccuracies in the drilling pattern can be compensated in
this way.
If the lifting columns are not exactly parallel, the top distance between the lifting columns can
change. This is why only one lifting column can be fixed (solid mount) and all others should have
a floating mount in the table plane (floating mount). This guarantees that stresses cannot arise
during motion.
The greater the distance between the lifting columns, the better the movement behaviour. If the
lifting columns are not tightly together, then control deviations have a greater effect. The table
plate is unsteady during movement. If the distance is greater, this effect is less.
7. Working life
Fixed bearing
Floating
bearing
Rigid connection
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