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You can use the slip roll to create a
bend with the correct radius so that
the two ends meet, forming a 150
mm diameter cylinder (Figure 20).
NOTE:
Performing multiple passes
through the machine with
gradual reductions in the
curve radius produces better
results than trying to make
the curve in one or two
passes.
TO CREATE A CYLINDER:
1. Use the diameter adjustment knobs to fully lower the rear roller below the
level of the bottom roller, then rotate the thickness adjustment leaf bolts
counterclockwise until the upper roller can be lifted with enough
clearance for the workpiece.
2. Insert the workpiece between the
upper and lower rollers and just
over the rear roller, as illustrated in
Figure 21, then snug the thickness
adjustment leaf bolts down to
secure the workpiece. Make sure
you tighten the leaf bolts the
same amount.
3. Turn the hand crank clockwise to
feed the workpiece through the
machine until it is approximately
half way through the upper and lower rollers.
4. Turn the diameter adjustment
knobs clockwise knobs to lift the
rear roller until the desired radius
bend is reached, as illustrated in
Figure 22. Make sure to turn the
knobs equal amounts so the rear
roller is always parallel with the
other rollers. Failure to do so will
create a larger radius on one end
than the other, resulting in a cone
shape.
NOTE:
Always err on the side of making the radius too large rather than too
small. It is easy to decrease the radius but very difficult to increase the
radius later.
Fig. 20
Fig. 21
Fig. 22
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