Laying Out Bends; Stubs; Offsets - Greenlee 881 Manual De Instrucciones

Laying Out Bends

The following drawings and bending charts are intended
to provide the information necessary to accomplish the
most common types of bends. The "Special Bending
Information Chart" contains precise measurements for
the most commonly needed bends.

Stubs

HEIGHT
(H)
ANGLE
Y
MARK
1. Select the size and type of conduit. Determine the
height of stub and the angle of bend.
2. Find the chart that corresponds to the size and type
of conduit selected in Step 1.
3. Under the column labeled ANGLE, find the angle of
bend.
4. Find the row labeled Y. In the row at the top of the
page, find the height (H) of the stub.
5. The number shown at the intersection of row Y and
the appropriate H column is the distance Y. Place
the bending mark Y inches from the end of the
conduit.
6. Bend the conduit.
Greenlee Tools, Inc.
881 and 881CT Hydraulic Benders

Offsets

An offset is used to route the conduit around an
obstruction. To make an offset, two equal bends are
required. The distance between the two bends is the
center-to-center distance. This is represented by L1
in the bending tables.
When working past an obstruction, it is necessary to
determine the location of the first bend. The center-
to-center distance is then used to find the location
of the second bend. See "Offsets: Working Past an
Obstruction." When working toward an obstruction, it is
necessary to determine the location of the second bend.
The center-to-center distance is then used to find the
location of the first bend. See "Offsets: Working Toward
an Obstruction."
Offsets: Working Past an Obstruction
START OF
FIRST BEND
LENGTH
HEIGHT
(H)
LENGTH – X
BENDING
MARK 1
1. Select the size and type of conduit. Measure the
height of the obstruction and the distance labeled
LENGTH. Select the angle to be used.
2. Find the chart that corresponds to the size and type
of conduit selected in Step 1.
3. To the right of the size and type of conduit, find the
dimension labeled X. Subtract X from LENGTH.
Place the first bending mark this distance from the
end of the conduit.
4. Under the column labeled ANGLE, find the angle of
bend. Find the row labeled L1. In the row at the top
of the page, find the height (H) of the offset.
5. The number shown at the intersection of row L1 and
the appropriate H column is L1. Place the second
bending mark L1 inches from the first bending mark.
6. Bend the conduit.
25
4455 Boeing Dr. • Rockford, IL 61109-2988 USA • 815-397-7070
ANGLE
L1
BENDING
MARK 2