18
ADJUSTING LOWER BLADE
GUIDES AND BLADE
SUPPORT BEARING
DISCONNECT MACHINE FROMPOWERSOURCE.
The lower blade guides and blade support bearing
should be adjusted at the same time as the upper guides
and bearing as follows:
1. Loosen the two screws (A) Fig. 46, and move the guides
(B) as close as possible to the side of the blade, being care -
ful not to pinch the blade. Then tighten screws (A).
2. The front edge of the guide blocks (B) should be adjust -
ed so they are just behind the gullet s of the saw teeth
by turning the knurled knob (C) Fig. 46.
3. The lower blade support bearing (D) Fig. 46, should
be adjusted so it is about 1/64 behind the back of the
blade by turning the knurled knob (E).
Fig. 46
D
C
E
A
B
A
CHANGING THE BLADE
MAKE CERTAIN THE MACHINE IS DISCONNECTED FROMTHEPOWERSOURCE.
NOTE: Blades for the 14 band saw are 93-1/2 in length
1. Open the upper and lower wheel guards.
2. Release tension on the band saw blade.
3. Remove the t able adjustment pin and t able insert.
4. Slide the saw blade of f the wheel and guide it out
through the slot in the t able.
5. T o inst all the new saw blade, reverse the above pro -
cedure. NOTE: Blade teeth should be pointing down -
ward at the front of the t able.
BAND SAW BLADES
A band saw blade is a delicate piece of steel that is sub -
jected to tremendous strain. Y ou can obt ain long use
from a band saw blade if you give it fair treatment. B
ensure you use blades of the proper thickness, wid th,
and temper for the various types of material to be cut.
Always use the widest blade possible. Use the narrow
blades only for sawing small, abrupt curves and for fine
delicate work. This will save blades and will produce
better work. Band saw blades may be purchased, weld-
ed, set and sharpened ready for use. For cutting wood
and similar materials, we can supply them in wid ths of
1/8, 3/16, 1/4, 3/8, 1/2, and 3/4 inches.
File and set the wood cutting blades whenever you find it
requires pressure to make them cut. If a blade is broken
it can be brazed or welded; however, if it has become
badly work-hardened, it will soon break in another place.
If you are not equipped to file, set and braze or weld
blades, t ake them to a saw filer for reconditioning. Under
average conditions, blades should be resharpened af ter
4 hours of operation.
Any one of a number of conditions may cause a band
saw blade to break. Blade breakage is, in some cases,
unavoidable, being the natural result of the peculiar
stresses to which such blades are subjected. It is, how -
ever, of ten due to avoidable causes, most of ten to lack of
care or judgment on the p art of the operator in mounting
or adjusting the blade or guides. The most common
causes of blade breakage are: (1) faulty alignment s and
adjustments of the guides; (2) forcing or twisting a wide
blade around a curve of short radius; (3) feeding too fast;
4) dullness of the teeth or absence of suf ficient set;
(5) excessive tightening of the blade; (6) top guide set
too high above the work being cut; (7) using a blade with
a lumpy or improperly finished braze or weld; and (8)
continuous running of the saw blade when not in use for
cutting.
New blades for the st andard 14-inch Band Saw are
93-1/2 inches long. The adjustment will accommodate
blades up to a maximum length of 94 inches and to a
minimum length of 91-1/2 inches. When equipped with
the No. 28-984 Height Att achment, new blades should be
105 inches long; maximum and minimum lengths are
106 and 103-1/2 inches.
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