TB 44: Rotary Saw Flashcards

1
Q

The rotary saw is a versatile high speed, hand held, gas powered cutting device designed to cut solid materials such

A

steel, wood, masonry or polycarbonate

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2
Q

utilized in a variety of operations such as

A

forcible entry, ventilation and USAR operation

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3
Q

Each rotary saw will have access to several different

A

blade types, a scrench tool, and a blade board

allows for members to have a variety of options while on scene of an emergency

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4
Q

The LAFD carries 4 types of 14” rotary saw blades. What are they?

A

Abrasive Blade

Combi-Blade

Diamond Blade

Carbide Tooth Blade

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5
Q

Each blade type has a specific use. Each rotary saw should be accompanied by a blade board that has an assortment of blades that best fits the needs of the district. All companies shall have at least

A

one of each blade type available

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6
Q

METAL CUTTING ABRASIVE BLADES

A
  • consists of grit bonded by an organic binder
  • Reinforced blades” are made up of a fabric or fiber base, preventing total breakage at maximum working speed
  • used on steel, steel alloys and other hard metals

-not be used on soft metals such as aluminum or brass

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7
Q

Blades shall be a minimum of

A

12” to remain in front line service.

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8
Q

Blades used during emergency operations may become

A

smaller while performing extensive cutting operations

-used until it is no longer effective or safe

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9
Q

Blades smaller than 12” may be used for

A

training purposes

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10
Q

Blades below 9” shall be sent into

A

shops for replacement

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11
Q

Abrasive blades shall be removed from service if there are signs of

A

petroleum product contamination or cracks

-could render the blade unsafe

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12
Q

Blades that are no longer safe for use shall be marked with

A

F-175 Tag

word “UNSAFE” shall be marked on the blade

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13
Q

COMBINATION “COMBI” BLADE

A
  • diamond blade that consists of a steel flat metal disc with synthetic diamonds bonded to the outer edge
  • do not have teeth to cut; rather they have exposed diamond crystals used to grind the material
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14
Q

Stamping or printing by the manufacture near the arbor with “Metal/Steel”, “Metal Cutting”, or “Concrete/Metal” indicates

A

combination use blade

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15
Q

Combi-blades can be used to cut

A

bare metal, concrete, reinforced concrete, masonry or Robertson Decking

-All Combi-blades are bi-directional

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16
Q

Combi-blade is not designed to cut

A

soft metals such as brass or aluminum

-however it can cut thin, soft metal found on train siding, aircraft siding, metal clad doors, or aluminum gates

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17
Q

Any glazing or buildup of material on the diamond segment can be cleaned by

A

cutting into a soft material such as brick, cinder block or asphalt

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18
Q

After several thousand grinding rotations, the exposed matrix holding the diamonds begins to

A

wear and fracture

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19
Q

Matrix erosion exposes new sharp diamonds. This cycle of erosion and exposing continues until

A

all of the diamond and bond section of the segment is gone

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20
Q

Combi-blade had a continuous cutting depth of

A

4¾”

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21
Q

Combi-blades shall be forwarded to Supply and Maintenance for replacement when:

A
  • 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
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22
Q

CONCRETE DIAMOND BLADES

A

similar in construction to the Combi-blade

  • designed as a directional cutting rotation
  • arrow stamped or printed on the blade indicating the proper rotation
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23
Q

Concrete diamond blades are designed to

A

Cut concrete and metal encased in concrete

*Do not attempt to cut bare metal with this blade!

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24
Q

Glazing or build-up of material on the diamond segments, can be cleaned by

A

Cutting in a soft material such as brick, cinder block or asphalt

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25
Q

As with the Combi-blades, Diamond blades shall be forwarded to Supply and Maintenance for replacement when

A
  1. Any one segment is fractured, broken or missing.
  2. Bald spots along any of the segments occur.
  3. Matrix bond is equal to the thickness of the blade body. No step or lip exists.
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26
Q

CARBIDE TIP BLADE

A

tempered metal blade, carbide tipped

  • cutting composition roofing material, wood, and Lexan
  • Use on light sheet metals such as door cladding or aluminum sheet with care
  • After use, check damage and sharpness. If a missing tip or a visible radius appears, fill out a F-175 tag and send the blade to Supply and Maintenance for replacement
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27
Q

safety equipment should be used while operating the saw

A

Gloves
Eye Protection
Helmet
Brush Jacket/Turn out coat

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28
Q

Engage the half throttle. This is accomplished by engaging the throttle and

A

depressing the throttle lock button on the left side of the throttle assembly

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29
Q

Pulling out the choke on the K-970 will

A

Activate the half throttle position

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30
Q

The half throttle will remain engaged until the throttle trigger is

A

Engaged even if the choke is pushed back in

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31
Q

What will assist in starting the saw?

A

Pressing in the compression valve

Automatically returns to its initial position when the saw starts

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32
Q

On the K-970, how many times do you press the air purge diaphragm?

A

6 times

33
Q

What happens when you push the air purge diaphragm?

A

Fuel is pumped through to the carb

Fewer pulls will be required for starting

34
Q

What are the two starting methods?

A

Ground Start or Drop Start

35
Q

Ground Start Procedures:

A
  • Grip front handle with left hand
  • Right foot on lower section of rear handle
  • Slowly pull cord with right hand, until resistance is felt
  • Pull firmly and rapidly
  • Pull cord to chest with right hand

-DO NOT pull the started cord all the way or let go of handle when cord is fully extended

36
Q

Drop Start Procedure:

A
  • Grip from handle with left hand
  • Stand upright, saw waist level
  • Keep blade away from body at all times
  • Right hand on starting handle, fully extend left arm down while pulling firmly and rapidly on starting handle towards chest
37
Q

Does the cutting blade rotate when the engine is started?

A

Yes

38
Q

Flooding Procedures:

A
  • Choke pushed in
  • Half Throttle engaged (allows maximum amount of air to flow through carburetor, combustion chamber and out exhaust)
  • Pull cord 4-5 times (air to fuel mix lower, saw will start)
39
Q

How does flooding occur?

A

Starter cord continually pulled while remaining in choked position after the saw pops or attempts to start

Fuel mixture in combustion chamber becomes too fuel rich until chamber is cleared of fuel

40
Q

To prevent from binding:

A
  • Adjust blade guard for cutting depth
  • Enter cuts at fu RPMs
  • Cut in straight line (Do not twist)
  • Let the saw work without forcing or pressing the blade
  • Release throttle and immediately remove blade if occurs (avoid belt damage)
41
Q

Which position is best when used during ventilation or extended concrete cutting operations:

A

Inboard position

Protects user from debris

42
Q

What are some cutting procedures options?

A
Vertical Cut Low
Horizontal Cut Low
Vertical Cut Mid
Horizontal Cut Mid
Vertical Cut High
Horizontal Cut High
43
Q

Carrying Aloft (12’ Utility Strap):

A
  • Larks foot around top of handle
  • Clip on itself with carabiner around throttle handle
  • Sling strap across chest to opposite shoulder
  • Position close to SCBA bottle
44
Q

Carrying Aloft (Equipment Carrying Strap):

A
  • Clip on itself around throttle handle and other end to backpack frame of SCBA
  • Place over shoulder, then opposite side of SCBA bottle
  • Position saw at SCBA bottle level by adjusting carrying strap
45
Q

Inboard: With the blade centered it reduces blade bind and provides better balance of the saw during ops such as:

A

Vertical ventilation on a roof or cutting concrete

46
Q

Inboard: The saw can be dragged through the material by using the _____, and the lower portion of the carrying handle as a ____?

A

Depth Gauge, Pivot and Skid

47
Q

What is the position of choice for forcible entry because it permits making flush cuts close to the walls and floors?

A

Outboard

48
Q

What are daily maintenance?

A
Fuel
Starting Position
Blade Guard
Belt Tension
Visual Inspection
Blades and Blade Board
Carrying Strap
49
Q

Weekly Check:

A
Perform Daily Check
Start & run till warm
Run to high RPM
Check for:
		Abnormal Sounds
		Abnormal Vibration
Inspect starter cord
50
Q

Monthly Check:

A
Check:
	Cutting head assembly
	Drive Belt
	Clutch assembly
	Air Filter
	Spark Plug
	Muffler
	Replace fuel if needed
51
Q

After Use:

A
Refuel
Blade/Blade Guard
Air Filter
Visual Inspection
Clean entire saw
Start & Run Saw
52
Q

What type of fuel does the saw take?

A

50:1 Two stroke fuel mixture

53
Q

Making two-stroke fuel:

A

Fill container half amount of gas
Add entire two stroke oil
Mix (Shake)
Add remaining amount of gas

*Do not make more than one months supply of fuel at a time

54
Q

Current LAFD policy is to replace fuel in small engines every ___ days with fresh fuel

A

30 days

55
Q

What are two forms of stabilizer to keep gas fresh

A

Sta-bil or

Seafoam

56
Q

Gas to 2 cycle oil ratio:

A

1 Gal - 2.6 oz
2.5 Gal - 6.5 oz
5 Gal - 13 oz

57
Q

Which form should the weekly checks be documented on?

A

F-973W

58
Q

During a weekly check, depress the throttle fully for ____ seconds to bring up the RPMs and allow the saw to return to idle before repeating the process how many times?

A

1-2 Seconds/ 2-3 Times

59
Q

With the engine stopped, slowly pullout the starter cord and inspect for:

A

General condition and fraying

60
Q

The starting cord should fully retract into the cover. If it fails to fully retract or shows signs of damage, contact:

A

Small Engine Repair shop at S&M

61
Q

When monthly checks are performed, where should you document it at?

A

F-973M

Perform Monthly checks, one saw at a time
When completed, perform a daily check prior to putting the saw back into service

62
Q

To check the Cutting Head Assembly:

A
  • Remove blade and check guard for debris
  • Losses drive belt, check arbor or clutch assembly that rotates freely without roughness
  • Arbor or clutch can not be checked with tension on belt
63
Q

When cleaning the air filter, to remove trapped debris, tap the filter gently on the…

A

Palm of your hands

64
Q

What should not be used when cleaning a paper filter?

A

Compressed air or solvents

65
Q

Who do you contact when filter is unserviceable?

A

S&M for replacement

66
Q

During which operation should special attention be given to the condition of the filter?

A

During extended dusty ops such as concrete cutting

67
Q

If the spark plug is dirty, what do you clean it with?

What is the electrode gap on the spark plug?

A

Wire Brush

.020” (0.5mm)

68
Q

How will the saw react if the spark plug has a issue or needs to be replaced??

A

Low on power
Difficult to start
Runs poorly at idle speed

69
Q

When does the rotary taken to the small engine repair shop to be inspected by S&M personnel?

A

Annually

During Annual Pump Test or Aerial Ladder Test

70
Q

What do you use to clean the exterior of the saw?

A

Water with mild detergent

71
Q

When cleaning the engine parts, where should you pay attention to the most?

A

Cylinder and head fins if soiled with such material as molten tar, clean with degreaser

72
Q

What do you want avoid cleaning with petroleum-based products?

A

Belt
Pull-Cord
Blade

Could damage integrity

73
Q

How long does the blade continue to rotate after the engine has stopped?

A

Up to a minute

*let blade slow down or stop. In the material

74
Q

Which area do you not use the blade for cutting?

A

Kickback zone

Reactive force will push the saw up and back towards the user

75
Q

What should be used If electrical hazards are suspected or exists?

A

Gauntlet gloves shall be used

76
Q

How far can sparks be thrown up to?

A

30 Feet

77
Q

Where should you NOT use the rotary saw?

A

In flammable atmospheres

Electrical vault fires
Tanker spills or leaking of natural gas

78
Q

To protect personnel or patients from showering sparks, move personnel, change the angle of your saw, or use non-sparking tools. If those options are not practical, at a minimum,

A

utilize an aluminized blanket to protect personnel or patients.