Evaluating Cutting Efficiency; Cutting Procedure; Using The Hydraulic Feed Control - Jet J-3130 Operating Instructions And Parts Manual

2. Disconnect the saw from its electrical power
source.
3. With the arm in its fully lowered position,
remove the pulley cover lock screw and open
the pulley cover.
speeds and belt positions.
Figure 12: Blade speeds and belt positions
4. To change the belt position (and, therefore, the
blade speed) first loosen the motor plate
adjustment lock nut. Refer to Figure 13 for the
position of the motor plate adjustment screw
and locknut.
Figure 13: Motor plate adjustment screw
5. Turn the adjustment screw counterclockwise
until the belt can be move to the pulley position
required.
6. Turn the adjustment screw clockwise to
tension the belt until there is 1/2 inch of play in
the belt as shown in Figure 14.
Figure 14: Setting correct play in drive belt
7. Tighten the adjustment lock nut.
8. Close the pulley cover and secure it shut with
the lock screw.
9. Reestablish electrical power to the saw and
proceed with cutting.

9.8 Evaluating cutting efficiency

Is the blade cutting efficiently? The best way to tell
is by observing the chips formed by the blade as it
cuts.
If the chip formation is powdery, then the feed is
much too light or the blade is too dull.
If the chips formed are curled, but straw or blue
colored, then the feed rate is too high.
Refer to Figure 12 for
If the chips formed are curled but not colored, then
the blade is sharp enough and cutting at an
efficient rate.

9.9 Cutting procedure

1. Never start a cut with the blade resting on the
work piece.
2. Be certain you knock off the sharp corners of
any work piece material which might damage
the blade. See Figure 4.
3. Have the motor ON and running at full speed
before lowering the blade into the cut.
4. Use the hydraulic control valve to feed the
blade into the work piece.
5. If you use a cutting fluid, turn the valve on
before beginning the cut.

9.10 Using the hydraulic feed control

Refer to Figure 15.
The hydraulic feed control cylinder is a "single
action" hydraulic cylinder. This allows you to lift
the arm at any time, easily, but controls the
downward movement of the arm using a valve on
the top of the cylinder.
Figure 15: Hydraulic feed control
When the control valve is turned fully clockwise the
cylinder is "locked" and the saw arm will not move
downward. You can lock the arm, using the valve,
at any position in its travel. This allows you to lock
the arm in its up position for operations which
require it. And it allows you to lock the arm in
positions which allow you to adjust work piece
length, etc.
Most important, use of the valve allows you to
begin any cuts "gently," which can greatly extend
the life of the blade. Simply open the valve slightly
to begin the cut, then open the valve to effective
cutting feed. See Evaluating cutting efficiency.
The valve is also important when breaking in any
new blades. See Blade break-in procedures.
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