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Push and Pull Forces
Push and pull forces are reactive forces that push the
equipment directly toward the operator, or that pull the
equipment directly away from the operator. These forces are
the result of cutting on the sides of the blade. The direction of
the force depends on the side of the blade being used, and
the direction of blade rotation at the point of contact. The
reactive force is in the opposite direction of blade rotation at
the contact point, regardless of where the contact is being
made. These types of reactive forces are also called “Blade
Thrust.”
As shown in the illustration, a blade turning
counterclockwise will cause the equipment to pull away
from the operator if the point of cutting resistance is on the
left side of the blade. If the point of cutting resistance is on
the right side of the blade, the equipment will push back
toward the operator. In both examples, the reactive force is
in the opposite direction of blade rotation at the contact
point where resistance occurs.
Kickout
Kickout is also a reactive force caused by resistance
to cutting, but the direction of blade thrust is lateral (to
the left or right of the blade), instead of forward or
back toward the operator. In most cases, Push, Pull,
and Kickout can be reduced or eliminated by:
• Using the correct blade for the cutting job
• Using properly sharpened blades
• Applying consistent, even force to the blade during
the cut
• Avoiding obstacles and ground hazards
• Using extra care when cutting harder materials
such as extremely dry brush, saplings, and small
trees
• Cutting from a stable, secure position
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