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CREATING CURVES
Your sheet metal machine can easily create constant radius curves in sheet
metal up to 1 mm in thickness (mild steel).
The method of creating a specific radius is a trial and error process. Due to the
many variations among metal workpieces, no single configuration of the
rollers will reproduce the same curve in all materials. We recommend testing
your roller configurations on scrap pieces that are the same dimension and
material as your final workpiece.
TO CREATE A CURVE IN THE WORKPIECE:
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.
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.
2. Insert the workpiece between the
upper and lower rollers and just
over the rear roller, as illustrated in
Figure 12, then tighten the
thickness adjustment leaf bolts
down to hold the workpiece
securely. Make sure you tighten
the leaf bolts exactly the same
amount.
3. Use the diameter adjustment
knobs to raise the rear roller, then
use the hand crank to pass the
workpiece through the machine
(see the illustrations in Figure 13-
14).
NOTE:
For good results, make the
first bend about 25% of the
the final radius, then slightly
increase the bend by 25%
with each successive pass
until the final radius has been reached.
Fig. 12
Fig. 13
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