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11
6.6 Slip Roll set-up
Do not roll material larger
than 30” (40”), 20-gauge
mild steel. The slip roll guard must cover the
rolls except when material is being fed into
the rolls. Failure to comply may cause
serious injury and/or damage to the machine.
Material Size Considerations
To determine approximate length of material
needed for a desired size tube, use the following
formula:
DC
π
=
,
where
C
is the circumference,
π
equals 3.1417
and
D
is the diameter.
For example: To find the length of material
needed (C) to form a tube 4" in diameter,
multiply 3.1417 by 4". Result: 12.5667" is the
circumference of approximate length of material
needed. Cut several pieces of material to this
length for a forming test run. Material may have
to be lengthened or shortened depending upon
results of test run.
TIP: If it doesn’t interfere with the proposed final
shape or design, a slight bend made with the
press brake on the leading edge will simplify the
initial rolling process, by allowing the leading
edge to slip more easily over the idle roll.
Beware of pinch point – the
intersection of upper and lower rolls. Failure
to comply may cause serious injury to
fingers and/or hands.
1. Make sure rolls and workpiece are clean
and free of debris to prevent pitting of sheet
metal.
2. Back off idle roll completely by rotating idle
roll screws (Q, Figure 12) counter-clockwise.
Figure 12
3. Loosen bolt (R, Figure 12) to increase space
between upper and lower press rolls.
4. Insert material between upper and lower
rolls, and tighten bolt (R, Figure 12) to lower
the upper roll, until material fits snugly. The
upper roll must have sufficient pressure on
work piece to feed properly.
5. Rotate both idle roll screws (Q, Figure 12) to
adjust idle roll’s proximity to the two main
rollers. Raise both ends an equal amount.
6. Run workpiece through the machine using
the handles. If workpiece is large, make
sure it receives proper support as it exits the
machine.
7. Make further passes of workpiece, raising
the idle roll incrementally before each pass,
until desired radius is achieved.
No exact formula can be followed when making
roll adjustments because material “spring-back”
varies with the kind of material being formed.
Only by test forming several pieces can correct
adjustments be obtained. Also, keep in mind that
it is much easier to re-pass material to make a
smaller radius than to attempt to increase a
radius that was made too small.
The idle roll must be adjusted exactly parallel or
the material will spiral during the rolling process.
Measure each end of the opening with calipers if
greater precision is required.
Deliberately setting the rolls non-parallel can be
used to make cone shapes.
To remove cylindrical shaped workpieces:
1. Loosen bolt (R, Figure 13)
2. Loosen thumb screw (S) to release the roll
catch.
Figure 13
3. Carefully grasp upper roll and swing out the
end.
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