TB 44 Rotary Saw Flashcards
Rotary saw make and models
Partner k 950 / Husqvarna k 960 and k 970
The cutting material on abrasive blades consists of ___.
grit bonded by an organic binder.
“Reinforced blades” are made up of a ____, preventing total breakage at maximum working speed if the blade should be cracked or damaged
fabric or fiber base
Abrasive blades are used on
Steel, steel alloy and other hard metals
Abrasive blades should not be used on soft metals such as
Aluminum or brass
Blades shall be a minimum of __ to remain in front line service
12”
Blades smaller than 12” may be used for ___
training purposes.
Blades below ___ shall be sent into the shops for replacement.
9”
Abrasive blades shall be removed from service if there are signs of ___ or __ which could render the blade unsafe.
petroleum product contamination / cracks
The Combi-blade is a diamond blade that consists of a steel flat metal disc with ___ to the outer edge.
synthetic diamonds bonded
Combi-blades can be used to cut on bare metal, concrete, ___, ____ or Robertson Decking
reinforced concrete / masonry
All Combi-blades are____.
bi-directional.
The Combi-blade is not designed to cut soft metals such as ___, however it can cut thin, soft metal found on train siding, aircraft siding, metal clad doors, or aluminum gates.
brass or aluminum
Any glazing or buildup of material on the diamond segment can be cleaned by cutting into a soft material such as ___
brick, cinder block or asphalt.
After several thousand grinding rotations, the exposed matrix holding the diamonds begins to wear and fracture. Matrix erosion exposes ___
new sharp diamonds.
This cycle of erosion and exposing continues until all of the diamond and bond section of the segment is gone. The Combi-blade had a continuous cutting depth of ____.
4¾”
Combi-blades shall be forwarded to Supply and Maintenance for replacement when:
Any one segment is fractured, broken or missing.
Bald spots along any of the segments occur.
Matrix bond is equal to the thickness of the blade body; a step or lip no longer exists.
A Diamond blade is similar in construction to the ___.
Combi-blade
Concrete diamond blades are designed as a ____. An arrow maybe stamped or printed on the blade indicating the proper rotation.
directional cutting rotation
Concrete diamond blades are designed to cut ___ and ____.
concrete / metal encased in concrete.
Diamond Blade : Do not attempt to cut ___ with this blade.
bare metal
Diamond Blade : Glazing or build-up of material on the diamond segments, can be cleaned by cutting in a soft material such as ____.
brick, cinder block or asphalt.
A tempered metal blade, carbide tipped, used for cutting _____.
composition roofing material, wood, and Lexan.
Carbide Tip Blade: Use on light sheet metals such as _____
door cladding or aluminum sheet with care.
On the K-970, press the air purge diaphragm ___. When you push the air purge diaphragm, fuel is pumped through to the carburetor. Fewer pulls will be required for starting.
6 times
Flooding Procedures:
- Ensure the Choke is ___ and the half throttle is engaged. This allows the maximum amount of air to flow through the carburetor, combustion chamber and out the exhaust.
- Pull starting cord and cycle the saw quickly about ___ As the air to fuel mixture in the combustion chamber lowers it will start.
pushed in / 4-5 times.
With the blade centered it reduces blade bind and provides better balance of the saw during operations such as ___.
vertical ventilation on a roof or cutting concrete
Fuel Mixture, how many ounces of 2 cycle oil?
1 gallon :
2.6 ounces
Fuel Mixture, how many ounces of 2 cycle oil?
2 1/2 gallon :
6.5 ounces
Fuel Mixture, how many ounces of 2 cycle oil?
5 gallons :
13 ounces
Current LAFD policy is to replace fuel in small engines every ___ with fresh fuel.
30 days
Also, a fuel stabilizer such as ___ should be used to keep gasoline fresh.
Sta-bil® or Seafoam®
If the spark plug is dirty, clean it with a wire brush and at the same time check that the electrode gap is ____ .If the saw is low on power, difficult to start or runs poorly at idle speed, the spark plug could be the issue and replacement may be necessary.
.020” (0.5 mm).
Annually, the rotary saw shall be taken to the ____ to be inspected by Supply and Maintenance personnel during Annual Pump Test or Aerial Ladder Test.
Small Engine Repair shop
Sparks can be thrown up to___.
30 feet.
The LAFD carries 4 types of ___ rotary saw blades
14”
Inboard
With the blade centered it reduces blade bind and provides better balance of the saw during operations such as ____ on a roof or cutting concrete.
vertical ventilation
