Special alignment options
127
5.4.4iv Spacer shaft
5.4.5 Sign convention
Vertical alignment plane:
› Offset is positive when the right shaft centerline is higher than the left
centerline.
› Gap and angularity are positive when the coupling opens toward the top.
Horizontal alignment plane:
› Offset is positive when the right axis is further away from the viewer than the
left axis.
› Gap and angularity are positive when the coupling opens away from the
viewer.
5.4.6 Coupling targets
The position of machines at rest can be considerably different than that during
operation (e.g. due to thermal growth or load-related displacements). This effect can
be compensated through use of alignment target values for the coupling, which allow
precise ‘misalignment’ when the machines are at rest so that they will be in proper
alignment position during operation.
Alignment target values may be found in the machine documentation or upon
request from the manufacturer or can be measured using the Live Trend Application
or PERMALIGN. For further details, contact your local PRÜFTECHNIK representative.
The coupling type determines the targets to be entered. These values are entered as
described in section 4.9 – ‘Coupling properties’.
Spacer shaft is a coupling
with two transmission
planes and a spacer.
Coupling results may be
displayed in any one of the
following formats:
‘Offset B/Offset A
Gap A/Gap B’
‘Angle α /Angle ß’
‘Gap/Offset at left’
‘Gap/Offset at right’
‘Angle/Offset at left’
‘Angle/Offset at right’
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