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11
• Blade guide support adjustment: used to set
distance between the saw blade guide bearing
as required by the size of the workpiece.
• Blade tension handwheel: use to tighten the
saw blade on the drive and idler wheels.
• Vise clamping handwheel: used to tighten the
vise jaws against the workpiece.
10.6 Setting blade speed
Only change speed while saw
motor is running. Failure to comply may cause
damage to motor.
1. The blade speed is controlled by an adjustment
mechanism on the right end of the saw. Speed
increases when the adjustment knob is turned
counterclockwise. Speed decreases when the
knob is turned clockwise.
2. A placard on the drive belt guard provides
recommended speeds for various materials.
3. A speed indicator is provided on the barrel of
the adjustment mechanism. The indicator
provides speed indications of 70,100,130 and
160 feet per minute (21,30,40 and 48 meters
per minute).
4. The feed rate graduations available on the
indicator may not match the recommended feed
rate. An approximate speed may therefore be
required. For example, to set a speed rate of 25
meters per minute, the indicator would be set
about midway between 21 meters-per-minute
and the 30 meters-per-minute graduations.
5. Turn the speed adjustment knob to the desired
rate setting as determined by the material being
cut.
Speed
MPM Material
25 Tool Steel, Stainless Steel, Alloy Steel,
Phosphor Bronze, Hard Bronze,
Hard Cast Iron, Malleable Iron
40 Mild Steel, Soft Cast Iron,
Medium Hard Brass,
Medium Hard Bronze
50 Soft Brasses and Bronzes,
Hard Aluminum, Plastics
75 Plastics, Wood,
Soft and Medium Soft Aluminum,
Other Light Materials
Table 2: Recommended blade speeds
10.7 Raising/lowering saw head
1. To raise saw head, press the Saw Head Up
pushbutton. The head will rise until upper limit
switch (Figure 15) trips.
2. To lower head, press Saw Head Down
pushbutton. The head will lower until lower limit
switch trips.
3. When saw head is being lowered to cut a
workpiece, the saw blade drive motor must be
started before lowering blade against
workpiece. Set coolant pump selector to the ON
( I ) position if coolant is required by the material
being cut.
Figure 15: limit switches
10.8 Controlling the cut: Hydraulic
feed control
The weight of the saw head provides all the force
needed to move the blade through the workpiece. In
fact, if the full weight of the saw head is allowed to
make the cut, rapid blade wear and poor cutting
accuracy will result. A hydraulic feed control is
provided that gives the operator a means to control
the speed and efficiency of cutting.
The hydraulic cylinder is attached between the saw
base and the saw head. The hydraulic cylinder
resists movement of the head in the downward
direction. However, the hydraulic cylinder offers no
resistance when the head is raised upward.
The amount of downward force can be controlled by
using the feed rate control valve. When the valve is
opened slightly, the saw head will move downward.
The further the valve is opened, the faster the head
will move downward.
The feed control is adjusted by the operator until the
saw is operating efficiently. This is usually
determined by observing chip formation. (See sect.
10.9 for more information.)
10.9 Evaluating cutting efficiency
Is the blade cutting efficiently? The best way to
determine this is to observe the chips formed by the
cutting blade.
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