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15
10.0 Operation
General operating procedure:
1. Turn feed knob to off.
2. Raise bow and set desired feed rate.
3. Position workpiece; make sure it is secure
within vise. Make sure left blade guide bracket
is adjusted as close as possible to left vise jaw.
4. Press Start to begin blade movement. Activate
and adjust coolant flow.
5. Turn feed knob to on. Adjust feed rate further if
needed.
6. Blade will shut off at end of cut. (If blade does
not shut off, limit switch stop bolt needs
adjustment.)
10.1 Blade selection
The HBS-916EVS and 1018EVS are provided with
a hook-type variable-tooth blade adequate for a
wide range of jobs on a variety of common
materials.
Sect. 12.0 shows 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
workpiece 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 for hard-to-cut materials such as
stainless steel, tool steel, or titanium, ask your
industrial distributor for more specific blade
recommendations.
Also, the supplier who provides the workpiece
material should be prepared to provide very specific
instructions regarding the best blade (and coolant or
cutting fluid, if needed) for the material and shape
supplied.
10.2 Blade break-in procedure
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 feed rate 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. Observe chip
formation until cutting is at its most efficient rate
(see sect. 10.3) and allow the saw to complete
the cut.
6. The blade is now considered ready for regular
service.
10.3 Evaluating cutting efficiency
The best way to determine if the blade is cutting
efficiently is to observe the chips formed by the
cutting.
If chip formation is powdery, then feed rate is much
too light, or the blade is dull.
If chips are curled, but colored — that is, either blue
or straw-colored from heat generated during the cut
— then feed rate or blade speed (or both) is too
high.
If chips are slightly curled, warm, and silvery (not
colored by heat), the blade is sufficiently sharp and
is cutting at an efficient rate.
Consult a machinist’s handbook or similar source for
specific speed and feed rates.
11.0 User-maintenance
Always disconnect power to
machine before performing maintenance,
unless indicated otherwise. Failure to comply
may result in serious personal injury.
Clean up accumulated saw cuttings after use. Make
sure vise lead screw is kept free of saw cuttings and
other material that would cause damage. Open both
wheel covers and remove chips from the wheel
housings.
Remove dust or debris from motor fan area with
compressed air or vacuum. Wear eye protection
when using compressed air.
If power cord is worn, cut, or damaged in any way,
have it replaced immediately.
Release tension on blade if saw will sit idle for an
extended period of time.
Periodically clean chip sludge from chip tray and
reservoir.
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