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LAFD Captain/Engineer > Training Bulletin # 44: Rotary Saw > Flashcards

Training Bulletin # 44: Rotary Saw Flashcards

1
Q

What safety equipment should be used at all time with use of a rotary saw?

A
  • Gloves
  • Goggles
  • Helmet
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2
Q

What are the two hazards associated with the use of a rotary saw?

A
  1. Blade continues to spin once throttle is released

2. Gyroscopic Effect

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3
Q

Hot sparks from saw cutting could be thrown as far as _.

A

15 feet

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4
Q

What can be used in conjunction with saw if sparks are a concern onscene?

A

Aluminized ceramic blanket ( Dimensions: 6’x8’)

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5
Q

What are the two makes of rotary saws per TB #44?

A
  • Partner K-1200 (14” blade)

- Homelite XL98 (12” blade)

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6
Q

What are the three basic types of blades?

A
  • Carbide tipped blades (wood)
  • Abrasive wheels blades (masonry/metal)
  • Diamond blades (concrete)
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7
Q

What specifically can a tempered metal carbide tipped blade be used to cut?

A
  • wood
  • composition on roof
  • lexan
  • light sheet metals (door cladding, aluminum sheet)
  • 12” and 14” blades
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8
Q

What specifically can the masonry composition blade be used to cut?

A
  • masonry
  • back up blade for light metals
  • identified with white or silver stripe
  • 12” and 14” blades
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9
Q

What specifically can a metal composition blade be used to cut?

A
  • metals for forcible entry
  • identified by green blotter label.
  • 12” and 14” blades
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10
Q

What specifically can a diamond blade be used to cut?

A
  • reinforced concrete
  • masonry
  • mixed materials.
  • 14” blade only
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11
Q

Should a diamond blade be used to cut metals?

A

NO. Avoid doing so because metals reduce blade life.

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12
Q

Diamond blades are expensive, fast cutting blades with a blend of hardened synthetic diamond material fastened to the outer edge. Arrows located near the hub indicate what?

A

Blade rotation

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13
Q

What is the rule of thumb in regards to using diamond blades?

A

Shall be used for emergency operations ONLY.

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14
Q

If a diamond blade is wanted for drilling purposes, who can we contact?

A

Battalion Headquarters. Each battalion will have one diamond blade for training purposes for entire battalion.

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15
Q

For best results as a rescue saw, why is the blade and guard mounted in the outboard position?

A

Allows cuts to be made in close proximity to walls, floors, etc.

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16
Q

The _ position is optimum for ventilation use.

A

Inboard

* This position reduces blade bind

17
Q

With the blade centered, the saw can be dragged through material, using the _ as a depth gauge and the lower portion of the _ as a pivot and skid.

A
  • guard

- carrying handle

18
Q

To avoid belt damage due to binding, what action needs to be taken by user?

A

Release throttle and immediately remove blade from cutting surface.

19
Q

The rotary saw is excellent when used for cutting thick or heavy roof composition as found on _ or _ types of roof construction.

A
  • flat

- older

20
Q

Judgement should be used prior to operating a rotary saw on any roof that is more than slightly pitched because of what?

A
  • Reduced reach

- Gyroscopic Effect

21
Q

What is downside of using a rotary saw for ventilation?

A

Difficult to feel structural members when cutting.

22
Q

A _ can be used to bring each blade type to the cutting site, providing greater flexibility to the operator.

A

Portable carrier

23
Q

What are the spark plug clearances for Homelite and Partner Rotary Saws?

A
  • Homelite: .025”

- Partner: .020”

24
Q

If the tank has not been refueled in the previous _ days drain fuel and refill with fresh _ mix.

A
  • 30

- 50:1

25
Q

When do you send in a carbide tipped blade into Supply Maintenance for a replacement?

A
  • Tip damage (missing tip)

- Sharpness (radius)

26
Q

Compressed air or solvents should not be used to clean _ filters. Instead tap filter gently on the palm of your hand.

A

paper

27
Q

Rotary saw shall be thoroughly cleaned after each use. Particular attention should be paid to cylinder and head fins if soiled with molten tar. Use only approved cleaning agents. _ shall NOT be used.

A

water

28
Q

Blades shall be measured and meet the following requirements for emergency use which are:

A
  • Partner: Minimum 12” for 14”

- Homelite: Minimum 10” for 12”

29
Q

Abrasive blades shall NOT be forwarded for exchange unless the total blade diameter is _ inches or less.

A

9

30
Q

How should damaged blades be sent in?

A

With F-175 tag and the word “UNSAFE” marked on the blade.

31
Q

Abrasive blades must be rated for spindle speeds of _ rpm or higher and must be sandwiched between blade blotters to take up any irregularities in thickness.

A

5,000

32
Q

Procedure for flooded cylinder

A
  1. Place saw on/off switch in “off” position
  2. Turn saw on its side (exhaust side down)
    3, Push in choke
  3. Pull starter rope, 4-5 times, to clear cylinder of fuel.
  4. Place switch to “on” position and use normal starting procedures.
33
Q

What is a sign the centrifugal clutch is bad?

A

The saw rpms increase proportionally with the throttle and the belt and blade do not.

LAFD Captain/Engineer (31 decks)

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