it's useful to find problems about band sawing machine.

1. Subject :-Manufacturing
Processes - 1
Band Sawing Machine
 Mechanical Engineering
 Prepared by :-
Mangukiya Riken

2. Introduction
 A sawing machine is a machine tool designed to cut off bar stock, tubing ,pipe, or
any metal stock within its capacity, or to cut sheet stock to desired contours. The
sawing machine functions by bringing a saw blade containing cutting teeth in
contact with the work piece to be cut, and drawing the cutting teeth through the
work piece. The sawing machine is much faster and easier than hand sawing, and
is used principally to produce an accurate square or mitered cut on rectangular
or cylindrical material.
 One of the two common types of sawing machines used for metal cutting in the
machine shop is the band saw machine. The band saw machine cuts by drawing
a continuous metal band, called a band saw blade, across the work piece. The
band saw blade is supported and driven by a drive wheel and an idler wheel.
 This sub course describes band saw operations and maintenance. This lesson
introduces three common models of band saw machines and describes their use.
In lesson two, the methods for maintaining, repairing, and troubleshooting these
three band saw machines will be discussed.

3. Types Of Band sawing machine
1) Vertical Band saw:-
 The vertical metal cutting band saw machine, being the more common
of the two types of band saw machines, is usually identified as a "band
saw machine" without using the word "vertical." A typical band saw
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 band saw machine does not require preformed band
saw 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 work piece 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.

4.  An attachment for the
metal cutting ban dsaw
twists the blade 30° or
90° so that stock which
normally could not be cut
because of insufficient
clearance of the sawing
machine column can be
successfully cut. Other
attachments permit the
use of band files and
polishing bands in place
of the band saw blade.
Adjustable guides for
holding and feeding work
pieces are also provided.
The machine has a power
feed mechanism operated
by counterweights. Forced
air for chip removal is
supplied by an air pump
in the base of the
machine.

5.  The typical metal cutting horizontal
ban dsaw Machine is a floor
mounted machine used for simple
cutting of solid steel, tubing, and odd
shaped material. The material to be
cut is mounted in a vise attached to
the bed of the machine. An electric
motor drives the band saw blade
through a belt and pulley
arrangement from which three
speeds may be obtained. The sawing
machine frame, upon which the
drive wheel, idler wheel, band saw
blade, and motor are mounted, pivots
from one corner of the sawing
machine bed.
2) Horizontal Band saw :-
 The frame is counterbalanced by a tension spring between the frame and the bed.
Feed is controlled by positioning a sliding weight along a bar fixed to the top side
of the sawing machine frame. A dashpot is positioned between the frame and bed
to stabilize the feed movement and prevent any quick movement of the frame that
could cause damage to the band saw blade. The vise used to hold the material
being cut is a quick positioning type and can be adjusted easily to any angle. An
adjustable work piece stop is provided for rapid positioning of production work
pieces.

6. Major parts of the Vertical Band
saw
Wheel Tension
Adjustment
Upper Guide
Adjustment
Upper Guide
Blade
Table
Switch
Guard
Table
Miter Gauge
Fence

7. 1. The blade is a circular band of steel with teeth shaped on its front edge.
2. The upper blade guide is an assembly that keeps the blade from twisting.
The depth of cut is adjusted by raising or lowering the upper blade guide.
3. The upper blade guide adjustment knob is used to raise and lower the
upper blade guide. It is on the right side of the saw.
4. The work table is the support for the material to be cut. A miter gauge
slot is formed into the table to cut angles on the saw. The work table also
has a fence guide to cut straight lines. The table is also able to tilt for
angle cuts.
5. The miter gauge is a guide that will adjust to cut angles and 90 degrees.
6. The fence is a guide for straight cuts and for re-sawing thickness.

8. Guard
 Should be 1/8” to ¼”
above the material being
cut
 Table is supported by
Base Is shown in below
figure..
Table

9. Miter
Gauge Fence

10. Operations of the Band saw
Ripping :-
Ripping is defined as
cutting along the
materials length OR
cutting with the
grain.

11. Cross cutting
 Cross cutting is defined as
cutting the material’s
length OR cutting across
the grain.
 A miter is defined as
cutting the material’s
length at an angle OR
cutting across the grain at
an angle.
Mitering

12.  Re sawing is defined
as cutting the
material’s thickness
 Freehand cutting is
defined as cutting on the
bandsaw without the use
of a guide to cuts arcs,
angles, etc.
Re sawing Freehand cutting

13. Application of Band saw Machines
 The band saw machine is used for external and internal
sawing.
 With the use of attachments, the band saw machine can
also serve a variety of other functions.
 Band files and polishing bands can be used in place of the
band saw blade for filing and polishing operations.
 A disk cutting attachment permits the cutting of true
circles. An angular blade guide attachment is furnished
with most band saw machines. This attachment twists the
band saw blade so that large or long work pieces that
would not normally clear the band saw machine column
can be cut.
 A miter guide attachment can be used to guide the work
piece at any convenient angle.

14. Advantages & limitation
Advantages :-
• Material can be cut using less power.
• Saving in raw material.
• Proper planning of utilization of material results less
material cost.
• Required accuracy can be achieved.
• Requires less skilled operator.
Limitations :-
• Only length cutting can be done.
• Other dimensions like , diameter ,lateral dimensions can
not be performed

15. The End …