Figure 2-38.Slip roll forming machine.
Figure 2-39.Forming cylinders on rolling forms.
rolls for the purpose of accommodating a wired edge
when forming a section with this type edge or for
rolling wire into a ring.
COMBINATION ROTARY MACHINE.
Preparing sheet metal for a wired edge, turning a burr,
beading, and crimping are probably the most difficult
of sheet-metal forming operations to perform. When
production dictates, large shops will have a machine
for each operation. However, a COMBINATION
ROTARY MACHINE (fig. 2-40) with a selection of
rolls will prove acceptable for most shop uses.
Wiring an Edge.The wire edge must be applied
to tapered shapes after they are formed. This is
accomplished by turning the edge on the rotary
machine. Gradually, lower the upper roll until the
groove is large enough for the wire. The edge is
pressed around the wire with the rotary machine (fig.
The wire edge can be finished by hand if a rotary
machine is not available. The edge is formed on the
Figure 2-40.Combination rotary machine with extra
Figure 2-41.Turning a wire edge with a rotary machine.