machines can be used for nonprecision cutting similar
to that performed by power hacksaws. Some types can
also be used for precision cutting, filing, and polishing.
A bandsaw machine is more flexible for straight cutting
than a power hacksaw in that it can cut objects of any
reasonable size and of regular and irregular shapes. A
power hacksaw has a more limited capacity; it can only
cut pieces with regular shapes. Also, the bandsaw cuts
much faster than the hacksaw because the cutting action
of the blade is continuous.
Figure 5-55 shows a tiltable blade bandsaw. The
blade may be set either upright or at any angle up to 45
degrees from the vertical. The work is held stationary
in a vise and the blade is moved into the work.
Figure 5-56 shows a tiltable table bandsaw. On the
type shown, you should feed work either manually or
by power to the blade, which runs in a fixed position.
During recent years, the tiltable table bandsaw has been
installed in most repair shops on repair ships and ten-
ders.
A third type of bandsaw is designed for heavier
Figure 5-56.--Tiltable table-type (contour) metal-cutting
bandsaw.
work and has neither a tiltable blade nor a tiltable table.
You will find this type on some ships.
Many of the new models, such as the one shown in
appear in the window, read in conjuction with stationary
figure 5-56, also have a job selector mounted on the
entries on the dial face, give the correct saw pitch, set
machine. The names of various materials are inscribed
and temper, saw velocity, and power feed pressure
on the outer ring of the selector. This ring is movable
needed to cut that particular material.
and can be positioned so that the name of any specific
Another type of metal-cutting bandsaw is shown in
material can be brought into alignment with the window
figure 5-57. This horizontal band cutoff saw is being
slot at the bottom of the dial. The numbers or letters that
used in shops on some ships to replace the reciprocat-
ing-type power hacksaw. The continuous cutting action
of the blade provides greater speed, accuracy, and ver-
satility.
Figure 5-57.--Horizontal band cutoff saw.
Figure 5-55.--Tiltable blade metal-cutting bandsaw.
5-32
