Loading ...
Loading ...
Loading ...
12
If the chip formation is powdery, then the feed rate
is much too light, or the blade is dull.
If the chips formed are curled, but colored — that is,
either blue or straw-colored from heat generated
during the cut — then the feed rate is too high.
If the chips are slightly curled and are not colored by
heat — the blade is sufficiently sharp and is cutting
at its most efficient rate.
10.10 Blade selection
The cut-off saw is provided with a saw blade that is
adequate for a variety of cut-off jobs on a variety of
common materials. A 4/6 vari tooth bi-metal blade
(5512107) and a 6/10 vari tooth bi-metal blade
(5512108) are available from JET.
See sect. 10.6 for recommended speeds for various
materials. These selections, while appropriate for
many shop cutting needs, do not encompass the
wide variety of blades of special configuration (tooth
pitch and set) and special alloys for cutting unusual
or exotic materials.
A coarse blade could be used for a solid steel bar
but a finer tooth blade would be used on a thin-wall
tube. In general, the blade choice is determined by
the thickness of the material; the thinner the
material, the finer the tooth pitch.
A minimum of three teeth should be on the work
piece at all times for proper cutting. The blade
and workpiece can be damaged if the teeth are
so far apart that they straddle the workpiece.
For very high production on cutting of special
materials, or to process hard-to-cut materials
such as stainless steel, tool steel, or titanium, you
can ask your industrial distributor for more
specific blade recommendations. Also, the
supplier who provides the workpiece material
should be prepared to provide you with very
specific instructions regarding the best blade (and
coolant or cutting fluid, if needed) for the material
and shape supplied.
10.11 Blade break-in procedures
New blades are very sharp and, therefore, have
a tooth geometry which is easily damaged if a
careful break-in procedure is not followed.
Consult the blade manufacturer’s literature for
break-in of specific blades on specific materials.
However, the following procedure will be
adequate for break-in of JET-supplied blades on
lower alloy ferrous materials.
1. Clamp a round section workpiece in the vise.
The workpiece should be 2 inches or larger in
diameter.
2. Set the saw on low speed. Start the cut with a
very light feed rate.
3. When the saw has completed 1/3 of the cut,
increase the feed rate slightly and allow the saw
to complete the cut.
4. Keep the same hydraulic cylinder setting and
begin a second cut on the same or similar
workpiece.
5. When the blade has completed about 1/3 of the
cut, increase the feed rate. Watch the chip
formation until cutting is at its most efficient rate
and allow the saw to complete the cut (see sect.
10.9). The blade is now considered ready for
regular service.
11.0 User-maintenance
11.1 Cleaning
1. Clean off any preservative on machined
surfaces.
2. After cleaning, coat the machined surfaces of
the cut-off saw with a medium consistency
machine oil. Repeat the oil coating process at
least every six months.
3. Clean up accumulated saw cuttings after use.
Make sure the lead screw is kept free of saw
cuttings and other material that would cause
damage.
4. Clean the chip sludge from the coolant tank.
The frequency should be determined by how
often the saw is used.
11.2 Lubrication
Lubricate the following components at the specified
frequencies and using the lubricants as defined:
1. Ball bearings: The bearings are lubricated and
sealed—periodic lubrication is not required.
2. Blade guide bearing: The bearings are
lubricated and sealed—lubrication is not
required. Inspect periodically.
3. Idler wheel bushing: The bearings are
lubricated and sealed—lubrication is not
required. Inspect periodically.
4. Lead screw bearing housing: Lubricate with
light oil monthly (see exploded figure, section
13.1.1).
5. Lead screw: Lubricate with light oil monthly (see
exploded figure, section 13.1.1).
6. Hydraulic cylinder pivot: Lubricate with light oil
every 6 months (see exploded figure, section
13.1.1).
7. Blade tension shaft: Lubricate with grease
every 6 months (see exploded figure, section
13.2.1).
8. Blade brush bearing: Lubricate with light oil
monthly (see exploded figure, section 13.2.1).
Loading ...
Loading ...
Loading ...