Basic Controls; Bend Allowance; Adjusting Setback - Grizzly T10718 Owner's Manual

Basic Controls

Use Figure 7 and following descriptions to become
familiar with the basic controls of the brake.
Pressure
Adjustment
Knob
Setback
Adjustment
Knob
Bending Leaf
Handle
Figure 7. Basic controls.
Pressure Adjustment Knobs: Adjust the clamp-
ing pressure for different workpiece thicknesses.
Setback Adjustment Knobs: Adjust the distance
of the bending blocks from the clamping fingers.
Bending Leaf Handle: Allows the operator to lift
the bending leaf to produce the bend.
Foot Pedal & Lock: Controls the action of the
clamping leaf.
Sharp edges of sheet metal
can easily cut fingers,
hands, or other body parts.
Always wear leather gloves
when handling sheet metal,
and always chamfer and
debur the edges.
-14-
Foot Pedal
& Lock

Bend Allowance

When a bend is made in sheet metal, the inside
surface of the bend compresses and the outside
surface stretches. To bend metal objects accu-
rately, you need to consider the length of each
bend, especially when more than one bend is
required. This is called bend allowance.
The bend allowance is added to the sum of the
outside dimensions of the workpiece flat surfaces
to obtain the overall length and width of the blank
needed to make a particular part.
Exact allowances can only be obtained by trial due
to differences in sheet metal hardness, whether
the bend is with or across the grain, and difficul-
ties in making an exact bend radius. Formulas for
calculating the bend allowance can be found in
metalworking handbooks or the internet.

Adjusting Setback

Setback is the required distance between the
bending blocks and the clamping fingers to prop-
erly make the bend (see Figure 8). A number of
factors determine the correct setback distance,
such as bend allowance, bend radius, and mate-
rial thickness.
There are many sources to help you calculate the
correct setback for your operation, such as metal-
working handbooks, the internet, or experienced
sheet metal workers.
Setback
Figure 8. Identification of setback.
Model T10718 (Mfg. Since 1/13)
Clamping
Finger
Clamping
Base