Laying Out A Segment Bend - Greenlee 777 Mode D'emploi

Laying Out a Segment Bend

When a bend with a large radius is necessary, segment
bending is required. Segment bending requires a series
of small bends, or shots, spaced closely together.
Use the formulas and tables that follow to mark the
conduit. To easily and accurately make the bend, use
a model 1802 Bending Table or a model 1807 Bending
Degree Indicator.
1. Determine the size of conduit to be used, the length
of stub needed, the degree of the bend, and the
bending radius.
2. Find the total length of conduit needed, which is
the developed length. Use the Developed Length
Formula or, for a 90-degree bend, use the Developed
Length for 90-Degree Bend Table.
3. Find the location of the center bend and mark the
conduit. To find the location, see To Locate the Center
of a 90-Degree Bend.
4. Refer to the Suggested Number of Bends Table.
Based on the radius, find an appropriate number of
bends. This is usually an odd number.
5. Divide the developed length by the number of bends
to find the distance between each bend.
6. Mark the conduit.
7. Use the Ram Travel Constants Table to find the ap-
proximate amount of ram travel per bend.
8. Bend the conduit.
Greenlee Tools, Inc.
Example: 2" conduit
60" stub
Example: 90° bend, 46"
Formula: 0.01744 x 90 x 46 = 72.2
Table: 72.22
48.92"
Developed Length: 72.22
Number of Bends: 15
Distance Between Bends:
Round to the Nearest
Fraction or Whole Number:
Place marks 4-13/16" apart
48.92'
Ram Travel Constant: 6.2
Number of Bends: 15
Approximate Ram
Travel Per Bend: 6.2 ÷ 15 = 0.41" inches
10
4455 Boeing Dr., Rockford, IL 61109 815-397-7070
777 Segment Bender
90° bend
46" radius
CENTER BENDING MARK
72.22/15 = 4.81
4-13/16