TOOLS 24 - CHAIN SAW OPERATIONS Flashcards
CHAIN SAW OPERATIONS
GENERAL RULES
In the starting stance, keep your body to the ________ of the chain and never ________ the saw or _______ across the chain.
In the starting stance, keep your body to the LEFT of the chain and never STRADDLE the saw or LEAN across the chain.
CHAIN SAW OPERATIONS
POLICY
Except for _____________ operations, the chain saw is not to be used for the ventilation or overhauling of structural fires
PIER FIRE
Except for pier fire operations, the chain saw is not to be used for the ventilation or overhauling of structural fires.
CHAIN SAW OPERATIONS
GENERAL RULES
In the starting stance, what are the hand positions?
Left hand - hold the handlebar on top behind the hand guard
Right hand - pull starter grip straight up
CHAIN SAW OPERATIONS
GENERAL RULES
In the operating stance, which arm is kept in the “straight arm” position?
LEFT ARM
Left arm kept in “straight arm” position to withstand any kickback force
CHAIN SAW OPERATIONS
GENERAL RULES
In the operating stance, the body is alway kept to the ________ of the chain.
LEFT
In the operating stance, the body is always kept to the LEFT of the chain.
CHAIN SAW OPERATIONS
GENERAL RULES
TRUE/FALSE
A member using the saw is allowed to lightly overextend as long as they maintain balance and my cut objects above chest high.
FALSE
- Do not overextend or cut while off balance.
- Do not attempt cutting above chest height.
CHAIN SAW OPERATIONS
GENERAL RULES
At what speed should the saw be running before allowing the chain to touch the wood?
FULL SPEED
- Hold saw near log and throttle up to full speed just before allowing chain to touch wood.
CHAIN SAW OPERATIONS
GENERAL RULES
When operating on slopes, the chain saw operator must always stand on the ________ side of the tree/log when cutting.
UPHILL
When operating on slopes, the chain saw operator must always stand on the UPHILL side of the tree/log when cutting.
CHAIN SAW OPERATIONS
GENERAL RULES
Start cuts with “bumper spike” against the wood and keep it there. Let the chain saw do the cutting. While firmly holding the saw, use the bumper spike for leverage as you slowly rock the saw in upward motions.
TRUE
CHAIN SAW OPERATIONS
GENERAL RULES
When does the operator release the throttle trigger of the chainsaw?
The moment the chain breaks clean of the object.
CHAIN SAW OPERATIONS
GENERAL RULES
What is pull-in?
Pull-in is when the chain on the bottom of the bar is suddenly stopped (by being pinched), the reaction of the saw pulls the chain forward and may cause the operator to lose balance.
CHAIN SAW OPERATIONS
GENERAL RULES
When does pull-in occur?
- frequently occurs when the bumper spike is not held securely against the tree or limb.
- chain is not rotating at full speed when it comes in contact with wood.
CHAIN SAW OPERATIONS
GENERAL RULES
How do you avoid pull-in?
- always start cut with chain running at full speed and bumper spikes in contact with the wood
- uses wedges to open the kerf or cut
CHAIN SAW OPERATIONS
GENERAL RULES
What is pushback and when does it occur?
- cutting the underside of a log or limb with the top side of the chain, the tip will be pushed out towards the operator
- the top of the bar is suddenly stopped when it is pinched, caught or encounters a foreign object in the wood.
CHAIN SAW OPERATIONS
GENERAL RULES
How does the operator compensate for pushback?
To compensate for this force, keep your left arm stiff and maintain constant pressure against log with the saw. Release the throttle trigger immediately after chain breaks clean.
CHAIN SAW OPERATIONS
GENERAL RULES
Tips to avoiding pushback?
- be alert to forces and situations that may pinch top of chain
- do not cut more than one log at a time
- do not twist the saw when withdrawing from an underbuck cut because the chain can pinch
CHAIN SAW OPERATIONS
GENERAL RULES
What does the “kerf” refer to?
The kerf is the space left behind the cutting blade as it cuts
CHAIN SAW OPERATIONS
SAW OPERATIONS
How big a radius is the circle of danger and who is allowed to operate within it?
10ft radius
The saw operator and control person will be the only personnel in this area during cutting.
Officer is to monitor conditions and relay orders received from the officer in command. If possible, officer is positioned as to permit visual contact with the control person.
CHAIN SAW OPERATIONS
SAW OPERATIONS
Where is the positioning of the control man during saw operations?
- The control member should be positioned as to permit easy visual contact with the operator maintaining a safe distance from the saw.
- The control member must maintain a sufficient distance, from the member using the saw, as to prevent any possible contact with the saw. The possibility of kickback or movement of the operator must be taken into consideration.
- If possible, this member is to maintain a visual contact with the officer.
CHAIN SAW OPERATIONS
SAW OPERATIONS
Members outside the circle of danger are to be deployed as required, what are some of their duties?
- monitoring incident for changing condition
- relief
- assist in refueling
- pedestrian and crowd control
CHAIN SAW OPERATIONS
SAW OPERATIONS
Where is the saw refueling area locating?
Outside the circle of danger
CHAIN SAW OPERATIONS
SAW OPERATIONS
What are the two reasons the officer must rotate members in saw cutting operations?
- reduce individual exposure to high noise levels
- prevent operator fatigue.
CHAIN SAW OPERATIONS
OPERATION PRECAUTIONS
TRUE/FALSE
Members must secure an object that has fallen against a structure before cutting it.
FALSE
- Do not attempt cutting an object which has fallen against a structure and is now supported by it.
- If a branch, tree section or other object is hanging, leaning or otherwise damaged members are to prevent access to the danger area by unauthorized persons. If practical, the object should be stabilized by lashing or shoring. The cutting down of it is not to be attempted
CHAIN SAW OPERATIONS
OPERATION PRECAUTIONS
Trees are ________ conductors of electricity.
GOOD
Trees are GOOD conductors of electricity.
