Gardner Bender Guide to Profitable Bending - Manual (Page 28)

For GB Sweep Benders
1. Mark desired turn-up (H) dimension on straight length of conduit.
2. Locate the size of conduit you are bending in charts. Select the
desired sweep radius to find set-back (S) dimension.
3. Measure back dimension (S) and mark conduit. This is the first
bite mark.
4. Mark off given number of bites (column A) at spacing intervals given
in column B.
5. Place pivot shoes in conduit hole size shown on frame. Make first
bend to degree of angle shown in Column C.
NOTE: It may be advisable to overbend the first bite slightly to
compensate for accumulated springback.
6. Make all succeeding bends by moving the pivot shoe (without the
optic angle gauge) to a hole that keeps conduit parallel to edge of
bending frame while using the same amgle of bend.
For 15° and 30° Kicks and Offsets using a sweep bender, see
pages 20 - 23.
See pages 30-31 for sizes 1 1 ⁄ 4 "- 5".
* Radii correspond to 90° one-shot bends
29
Centerline (A) (B) (C)
Conduit Radius (S) No. of Spacing Degree
Size (R) Set - back Bites (90°) betw. Bites per Bite
5 3 ⁄ 4 ” * 4 7 ⁄ 8 3 3” 30°
7 3 ⁄ 4 ” 6 7 ⁄ 8 4 3” 22°
9 3 ⁄ 4 ” 8 7 ⁄ 8 ” 5 3 1 ⁄ 8 ” 18°
11 3 ⁄ 4 ” 10 7 ⁄ 8 ” 6 3 1 ⁄ 8 ” 15°
13 3 ⁄ 4 ” 12 7 ⁄ 8 ” 7 3 1 ⁄ 8 ” 13°
1"
90° Sweep Bend
Instructions for
Sweep / Segmental Benders
H
R
S
H
L
7 / ˝ 1 8 7 / ˝ 1 8 7 / ˝ 1 8 7 / ˝ 1 8 7 / ˝ 1 8
See page 23 for
Minimum “L” Dimension
First
Bite Bite Bite Bite Bite Bite
(1) (2) (3) (4) (5) (6)
Top Bender Plate
Top Bender Plate
Cylinder
Cylinder
Bottom Bender Plate
Bottom Bender
Plate
Move this Pivot Shoe for All
Succeeding Bites
Optic Angle
Gage
Optic Angle
Gauge
Pivot Pin
Pivot
Pin
First
Bite
Bite
Second
Bending
Bending
Shoe
Shoe Conduit
Pivot Shoe
Pivot Shoe
28
Example: To make a 90° Sweep Bend in 3" conduit
having a 27
1 ⁄ 4 " radius, mark conduit as shown using
information A, B, C and S in 3" conduit chart shown
on page 31.
E-507 Guide to Profitable Bending rA.qxd 10/19/09 3:17 PM Page 55