TOOLS 9/Portable Power Saw Flashcards
Carbide Tip Blades cut …?
gravel and tar covered roofs
- wood flooring
- LIGHT SHEET METAL
- similar material
Do NOT use on - metal security doors, auto bodies, metal window bars and case hardened locks
life span of blade is SHORT
FULL RPM before contacting surface with blade
-do not over extended or reach forward past point of balance
slight BACK AND FORTH will widen cut and PREVENT blade form binding
-maintain saw at FULL RPM
CARBIDE TIP OOS:
- 8 or more tips broke/missing from 24 tooth blade
- 3 or more tips broke/missing from 12 tooth blade
- blade is cracked
- center hole wears out of round
ALUMINUM OXIDE Blades and silicon carbide (abrasive disc)
aluminum oxide
- various types of STEEL, including auto bodies
- metal security doors/metal window bars
- LOW speed when contacting material then gradually increased as disc cuts into material
silicion carbide : painted yellow on both sides
masonry /concrete
-LOW speed when contacting material then gradually increased as disc cuts into material
ABRASIVE OOs:
-cracked or badly nicked
-center hole wears out of round
disc worn to 8 inches in diameter or less
Fuel tank sufficient for ?
20-30 minutes of CONTINUOUS OPERATION
- gas and oil mixture
- 1 BOTTLE OF 2.6oz cycle oil to 1 gallon fresh gasoline
Inspection and Maintenance …
-beginning of each tour AND MUD Routine field maintenance : -change blades -refuel tank adjust tension of belt -clean exterior of saw
-test saw in safe area
-shake VIGOROUSLY to mix fuel/oil
-blades must be kept tight on saw
ENGINE SHOULD NOT BE RUN WITHOUT AIR FILTER
Have a plan of action ?
BEFORE starting the saw:
- location and sequence of cuts and openings
- wind direction-effect on exposures and men
- safe means of egress
Whenever POSSIBLE, team of 2 members should perform cutting operations…
- complete PPE
- gloves on and goggles in place… goggles should be attached to saw carrying handle
-OFFICER should select best method compatible with circumstances
Guide can assist Operator by…
GUIDE will stand to rear of operator and grasp guide device with ONE HAND
- hold metal snap portion of life belt or safety harness worn by the operator for guidance
- may also use CARRYING SLING
note: technique of backing up and cutting (to avoid cutting feet) should practiced in quarters (WITHOUT SAW BEING STARTED )
Guide and Operator physical communications?
ONE SLAP on back- STOP CUT
TWO SLAPS on back- CUT
THREES SLAPS on back- shut down saw
Circle of Danger?
20 foot radius ….MEASURED FROM POINT WHERE THE BLADE OF SAW IS IN OPERATION
- ONLY OFFICER (chain saw is only operator and guideman), OPERATOR and GUIDEMAN
- Operator should not bring a “live saw” into a position that puts other members within Circle of Danger
ALL MEMBERS in IMMEDIATE area of cutting ops shall wear full PPE…also applies while testing the saw or drills…
Wear safety goggles and eye shields DOWN
When present____should control saw operations?
OFFICER
BEFORE moving from one position to anther…
DISENGAGE CLUTCH…RELEASE TRIGGER…PLACE BLADE ON FLAT SURFACE TO STOP BLADE FROM SPINNING…..keep blade on surface and ROLL saw to next assignment…guide will hold operator and the two should proceed in unison…
-when maneuvering over obstacles, hoselines, etc…return saw blade to surface ASAP
The saw should ALWAYS be shut down when unattended?
ALWAYS
-shut down when moving to distant areas…level to level
GUNNING the saw while OPERATOR is standing by or moving to a new position is NOT PERMITTED
Saw cut should be as deep as necessary…
-deep cuts may weaken supporting beams and lead to collapse
Saw should NEVER be forced
When saw is used on OTHER THAN HORIZONTAL SURFACE…
blade guard should be moved and secured to protect operator
used in this position ONLY DIRECT ORDER/SUPERVISION of OFFICER
use of power saw from LADDER (exception being TOWERL LADDER) is NOT RECOMMENDED if there is another alternative
REFUELING?
NEVER refuel while saw is running
- tilt saw away from engine
- use funnel
- engine may be hot
When is the only time the saw is lifted with BLADE TURNING?
when starting or completing a cut
- before cutting, survey area for escape route
- preferably , saws STARTED in smoke free area ,close to point of operation
Boxer stance…
18-20 INCHES apart
Initial Cut…
Carbide blade- rev up saw-FULL RPM BEFORE contacting material…maintain full RPM while cutting
Abrasive Disc–low speed before contact…speed gradually increased as disc cuts into the material…then to full throttle
Initial Cut…
Carbide blade- rev up saw-FULL RPM BEFORE contacting material…maintain full RPM while cutting
Abrasive Disc–low speed before contact…speed gradually increased as disc cuts into the material…then to full throttle
Operators feet is NEVER Placed BETWEEN?
2 CUTS
-or between one cut and unsupported end
Beams run the ____side of building, usually ____on center?
SHORT SIDE
16”
-roof boards run perpendicular to beams, usually front to rear
Good indication of cut on a beam?
SPARKS
-move saw to INSIDE of cut
If resistance is met while cutting perpendicular to beams, lift saw, continue cut, but avoid a deep cut into beams
Roof:
Beams run the ____side of building, usually ____on center?
SHORT SIDE
16”
-roof boards run perpendicular to beams, usually front to rear
Good indication of cut on a beam?
SPARKS
-move saw to INSIDE of cut
If resistance is met while cutting perpendicular to beams, lift saw, continue cut, but avoid a deep cut into beams
A hook , brought to roof of taxpayer can be used efficiently to push down double ceilings, open returns?
10 FOOT hook
Examining cockloft, preferably by?
FROM FLOOR BELOW
OPENING CEILINGS on Top floor (faster and less damaging )
-when other than exploratory hole made, hose line should be in readiness
-at times, it may be necessary to initiate interior ventilation to maintain satisfactory operating conditions
FROM ROOF:
If this is not possible, TRIANGULAR openings on roof (size of saw blade)
-cockloft observed by opening returns between the roof and the top floor
-caution should be exercise when choosing returns, returns REMOTE FROM FIRE AREA SHOULD BE AVOIDED
Saw Sling MUST be removed before starting saw
Silicon Carbide Blade- BOTH sides painted YELLOW
Saw Sling MUST be removed before starting saw
Silicon Carbide and Aluminum OXIDE Blades are similar looking:
Silicon Carbide Blade- BOTH sides painted YELLOW
Aluminum Oxide is unpainted
ROOF CUTTING:
HOT SPOTS
- soft spots /tar bubbles
- melting snow or ice
- wet roof–steam or dry area
- soil pipes, vent pipes, hot to touch
-saw is designed so that rooF BOARDS and coverings shall be cut in ONE OPERATION , sometimes cut can be lifted in one piece
if excessive resistance to the saw is encountered, cut may be on BEAM…SPARKS ARE GOOD INDICATOR
Move saw to INSIDE of the cut
-if resistance is met when cutting PERPENDICULAR to roof beams , lift the saw , continue to cut, but AVOID DEEP CUT INTO BEAMS
FRESH SMOKE coming from the area of the saw blade and SLOWING of the blade usually indicates TOO DEEP a cut through HEAVY MATERIAL.
remove the saw from the cut, rev up the saw up to max RPM and being a slightly shallower cut, if this does not work, check the blade
’ COFFIN CUT’
-CUT 1- 3 FEET
CUT 2- KNOCKOUT CUT
CUT 3- 6 FEET
CUT 4-7- 3 FEET
- make sure roof is not opened before it is completely cut
- push down ceiling to complete ventilation
COMBO METAL/CONCRETE (DIAMOND BLADE)
-Forcible entry saw (will replace aluminum oxide/silicon carbide)
-12 inch diameter
-cuts case hardened lock, chain link fence, rebar, security gates, car doors, stucco, concrete , stone, BULLETPROOF GLASS, plastic pipe
can cut wood, NOT RECOMMENDED
-made from solid steel, no welds
-WET and dry cutting
-90 % less sparks than abrasive discs
-one blade will outlast 150 quality abrasive discs
when saw is operating, FREQUENTLY back saw out of cut, so that air can cool the blade…excessive wobbling during use, discontinue and inspect blade
-if blades heats up and GLOWS Red, discontinue until blades cools down , to reduce likelihood of blade overheating during prolonged cutting, use gentle stream (water extinguisher ) on blade at point of contact
OOS:
-cracked , chipped, warped, bent
IF BLADE WOBBLES AFTER TIGHTENING ARBOR BOLT , blade remove from saw place on surface and checked for warping or bending
blade is BIDIRECTIONAL –blade should be FLIIPPED AFTER USE
-if blade becomes glazed over and cuts ineffectively, clean with abrasive material such as concrete, this will expose more diamonds
begin a cut, bring blade INTO CONTACT with the material (not running saw), the run engine at speed such that material does not get caught in between spacing , causing blade to bounce or bind. ..speed GRADUALLY INCREASED as blade cuts into material , then work at FULL THROTTLE
DIAMOND BLADES –EXCHANGE ONE FOR ONE
-blade and RT-2 along with FIRE TOOLS and equipment requisition form fowled to fire tools and equipment
abrasive discs will no longer be replaced
Carrying sling..
breaking strength 1000 pounds
-double action carabineers attach to blade guard and handle
- slinG MUST BE REMOVED BEFORE SAW IS USED
- CONVERT TO HARNESS, attach carabineers of the sling to the mask harness , where the shoulder straps connect to waist strap
