Jet SBR-30M, Инструкция по эксплуатации и каталог запасных частей

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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:
D C
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.
Grasp upper roll firmly, to
prevent it falling out of machine.
4. Slip workpiece off end of roll.