BANDSAW OPERATIONS - OD1646 - LESSON 1/TASK 1
Types of Metal Cutting Bandsaws
Metal cutting bandsaw machines fall into two basic categories: horizontal
machines and vertical machines. Vertical bandsaw machines are more commonly
On vertical machines, the blade's cutting position is vertical and
cuts into the side of the stock. The blade rotates on a fixed track between
the idler wheel mounted above the worktable and the drive wheel mounted
beneath the worktable.
The stock is moved against the blade to make the
cut. On the horizontal bandsaw machine, the cutting position of the bandsaw
blade is horizontal and cuts downward into the stock. The drive and idler
wheels are positioned lengthwise on the sawing machine frame, which pivots
from a corner of the sawing machine bed. With the horizontal machine, the
stock is fixed rigidly in a vise to the bed of the machine, and the blade is
fed downward into the workpiece.
The horizontal bandsaw machine is used
primarily for cutting stock to length, either at right angles or to any
desired miter angle. The vertical machine is more versatile and can be used
for contour cutting, filing, and polishing, as well as for simple stock
The vertical metal cutting bandsaw machine, being
the more common of the two types of bandsaw machines, is usually identified
as a "bandsaw machine" without using the word "vertical." A typical bandsaw
machine (figure 1 on the following page) is driven by an electric motor
through a belt transmission which permits adjustment of the blade speed
through a range of speeds.
The table may be tilted front-to-back or
sideways to make mitered cuts. The metal cutting bandsaw machine does not
require preformed bandsaw blades.
An electric butt welder and grinding
wheel are fastened to the sawing machine.
The welder is used to weld a
length of blade into a continuous band, and the grinding wheel is used to
remove beads caused by the welding.
Since the machine can weld its own
blades, internal cutting is possible. When making internal cuts, the blade
is inserted through a hole cut in the workpiece and is then welded into a
band and mounted to the machine. After cutting the internal shape in the
piece, the band is cut so that it can be removed.