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Petrol Powered Pole Tools

Understanding and Avoiding "Kick-Back"

and Other Reactionary Forces

Reactionary forces can cause loss of control of the

tool, particularly when using chainsaw attachments,

and can result in serious, even fatal injury – use the tool in ways to

avoid reactive forces at all times.

When the cutting attachment or chainsaw is rotating, many forces are

created, such as the ability to cut. The contact point between the cutting

tool and object to cut is critical, especially when using the chainsaw

attachment. If the cutting tool is not used correctly, cutting forces may

become "reactionary", in that instead of the cutting tool or chain rotating, a

reactionary force is created. Many factors affect the occurrence and force

of reaction, such as cutter speed, contact angle, density of material being

cut, and cutting tool condition.

Kick-Back

"Kick-back" is a reactionary force that causes the tool to rotate against the direction of cut. Kick-back can

also be thought of as the cutters "digging in" to an object and momentarily stop or significantly slow cutter

rotation. For chainsaw attachments, kick-back can occur if the cutters at the tip of the chain bar – the "kick-

back zone", "digging in" to an object and momentarily stop or significantly slow saw chain rotation, which

causes the tool to suddenly and quickly rotate backwards towards the operator. To avoid kick-back:

• Do NOT use the tip of the cutter for cutting or allow it to make contact with any object.

• Always hold the machine firmly with both hands when operating.

• Maintain cutter sharpness.

• Use extreme caution when re-inserting the cutter into an unfinished cut.

• Be alert to branches shifting or other forces that may close over or pinch the cutter.

Pull-In

"Pull-in" is a reactionary force that causes the cutter to pull forward in the direction of cut. Pull-in can also be

thought of as the cutters on the non-cutting side of the cutting attachment being caught, pinched or "digging

in" to an object and momentarily stop or significantly slow cutter rotation, which causes the tool to suddenly

and quickly pull forward in the direction of cut. To avoid pull-in:

• Be aware of objects on the non-cutting side of the cutter and avoid making contact with them.

• Use cutters with greater numbers of teeth or blades.

Push-Back

"Push-back" is a reactionary force that causes the cutter to push backward against the direction of cut. Push-

back can also be thought of as the cutters on the cutting side of the cutting attachment being caught,

pinched or "digging in" to an object and momentarily stop or significantly slow cutter rotation, which causes

the tool to suddenly and quickly push away from the direction of cut. To avoid push-back:

• Cut one piece of timber at a time.

• Avoid twisting the cutter when withdrawing it from material.

NEVER ALLOW ANY OBJECT

TO COME INTO CONTACT

WITH THE KICK-BACK ZONE

Kick-Back

Zone

Kick-Back

Pull-In

Push-Back

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