User's Manual

44 Revision 2 GM550 v1043 FCC-IC.doc
Radius Parameters for a Lattice Crane
The radius calculation parameters highlighted in green must be measured on the crane and set
into the radius settings of the GS550 display unit
Jib mounting point
Head sheave
Jib offset angle
Jib length
Boom length: distance
from boom base pin to
head sheave centre
Crane centre
of rotation
Boom base pin
Distance from head
sheave centre to jib
mounting point
(Your measurement)
Head sheave radius
(Your measurement)
Sheave head length:
distance from head
sheave centre to
boom centreline
(Your measurement)
Slew offset: distance from boom
base pin to crane centre of rotation.
If the boom base pin is behind the
centre of rotation this value must be
negative.
(Your measurement)
Figure: Basic radius parameters for a lattice crane