Nabrico DF-1 N Series, Owner'S Manual

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NABRICO DF-1 N ELECTRIC WINCH Owner’s Manual
OM-DF1-021-A
Fleet Angle:
In order to insure proper wrapping on the drum and no undue wear of the wire rope, the fleet angle
should be kept as small as practical. This is important to consider during the planning of a winch
installation. Sheaves and drums should be placed so that the fleet angle will be equal on each side of
the centerline of rope travel.
For a smooth drum a maximum fleet angle of 1-1/2 degrees is recommended. When the drum is
grooved to suit the wire rope, the fleet angle should not exceed 2 degrees.
Example: Fleet Angle Calculation for 36” Chain Drive Barge Moving Winch
36” Chain Drive Moving Winch
a=18”
b=x (distance to be determined)
A°=1.5° (minimum for a smooth drum)
tanA=a/b
tan 1.5°=18”/x
.02619=18”/x
x=18”/.02619
x ~ 688” (rounded up to next whole number)
x ~688” / 12 (convert to feet)
x ~58’
A.1 FLEET ANGLE