7
Palmgren Operating Manual & Parts List
9683311
OPERATION (CONTINUED)
CHANGING SPEEDS
Refer to Figures 6 and 10.
1. Loosen screw (Ref. No. 190) and open pulley cover (Ref. No. 189).
2. Loosen hex nut (Ref. No. 152) and turn hex head bolt (Ref. No.
151) counterclockwise to loosen belt tension.
3. Move V-belt (Ref. No. 183 to desired position on pulleys (Ref.
Nos. 185 and 184).
4. Turn hex head bolt clockwise to tension belt. Belt is tensioned
properly when a moderate pressure applied to the belt between
the pulleys produces ½” of deflection. Tighten hex nut to secure
belt tension.
5. Close and secure pulley cover.
FEED PRESSURE
•
Correct feed pressure holds the blade in the cut. Feed pressure
is supplied by the weight of the head. Maximum material re-
moval rate corresponds with the proper pressure.
•
Optimum feed pressure ensures that maximum power is used
for cutting. If the feed pressure is too low, the blade will not dig
into the material properly. Too much feed pressure will cause
the blade to dig too deeply, bogging down the motor, and pos-
sibly burning it out. In addition, blade “shocking” could result.
•
Extra energy will be used to produce powdered chips rather
than smooth shavings; this will produce more heat and dull the
blade.
CAUTION:
Do not attempt to increase feed pressure by leaning
on head.
REGULATING FEED PRESSURE
Refer to Figures 7 and 9.
•
Feed pressure is controlled by the feed regulator. The regulator
creates a force which counteracts the feed pressure. The force
from the feed regulator can be adjusted to create any feed pres-
sure up to the set maximum.
•
Having the correct feed pressure will produce the optimum
feed rate and the fastest cut. Incorrect pressure, whether too
great or too small, will put less power into the cut and reduce
the feed rate.
NOTE:
Wasted power damages the saw.
•
Determining the proper feed is largely a judgement based on
experience. The feed is usually determined during the cutting
operation. Before the cutting begins, the blade should be off
the work and the head should be held in position by closing the
knob on the feed regulator (Figure 9, Ref. No. 20).
•
Once the blade is running, the head is slowly lowered onto the
work by adjusting knob on the feed regulator.
•
After the blade begins the cut, optimum feed rate should be de-
termined.
•
To determine if the feed is incorrect, examine the chips pro-
duced. When the blade is operating at the ideal feed for the
speed, the chips will be curled and continuous. If the chips are
thick and not continuous, the feed pressure should be reduced.
If the chips are powdery, the feed pressure needs to be in-
creased (Refer to Figure 7).
CUTTING FLUIDS
•
Using a cutting fluid can improve the cutting conditions and
keep them more consistent throughout the cut by:
a. Lubricating the blade, which reduces the friction between it
and the workpiece.
b. Taking heat away from the cut and preventing the workpiece
and blade from overheating.
c. Dissipating the built-up heat because hot metals become
tough and more difficult to cut and blades become dull at an
accelerated rate.
NOTE:
Because much of the built-up heat comes from friction be-
tween the blade and the workpiece, cutting fluids are often re-
ferred to as “coolants”.
•
The importance of cutting fluids increases with blade speed
and toughness of the material.
•
There are many available types of cutting fluids. Consult a ma-
chinery handbook for specific information. The most common
general purpose coolant is a mixture of water and water soluble
oil. The producer of the water soluble oil should provide the ap-
propriate mixing ratios.
Figure 6 - Speed and Pulley Diagram
Figure 7 – Determine Feed Pressure
Powdery chips indicate too
little pressure. Turn knob
counterclockwise.
Curled shavings indicate cor-
rect feed pressure.
Thick discontinuous chips in-
dicate too much pressure.
Turn knob clockwise.
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